Initial clean commit (reset history)

.gitignore

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+/redmine_dmsf.iml
+Gemfile.lock
+.history
+tmp/

.rubocop.yml

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+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+plugins:
+  - rubocop-rails
+  - rubocop-performance
+
+AllCops:
+  TargetRubyVersion: 3.2
+  TargetRailsVersion: 7.1
+  SuggestExtensions: false
+
+  NewCops: enable
+
+  Exclude:
+    - '**/vendor/**/*'
+
+# Rules for DMSF
+Layout/LineLength:
+  Exclude:
+    - app/models/dmsf_query.rb
+
+Lint/SymbolConversion:
+  Exclude:
+    - test/unit/dmsf_file_revision_test.rb
+
+Lint/ScriptPermission:
+  Exclude:
+    - extra/xapian_indexer.rb
+
+Lint/UselessAssignment:
+  Exclude:
+    - lib/redmine_dmsf/lockable.rb
+
+Naming/BlockForwarding:
+  EnforcedStyle: explicit
+
+Metrics/AbcSize:
+  Enabled: false
+
+Metrics/BlockLength:
+  Enabled: false
+
+Metrics/BlockNesting:
+  Enabled: false
+
+Metrics/ClassLength:
+  Enabled: false
+
+Metrics/CyclomaticComplexity:
+  Enabled: false
+
+Metrics/MethodLength:
+  Enabled: false
+
+Metrics/ModuleLength:
+  Enabled: false
+
+Metrics/ParameterLists:
+  Enabled: false
+
+Metrics/PerceivedComplexity:
+  Enabled: false
+
+Naming/AccessorMethodName:
+  Exclude:
+    - lib/dav4rack/resource.rb
+
+Naming/PredicatePrefix:
+  Exclude:
+    - patches/attachable_patch.rb
+
+Style/HashSyntax:
+  EnforcedShorthandSyntax: either
+
+Style/ZeroLengthPredicate:
+  Exclude:
+    - lib/redmine_dmsf/webdav/dmsf_resource.rb
+
+Rails/BulkChangeTable:
+  Exclude:
+    - db/migrate/20170217141601_add_dmsf_not_inheritable_to_custom_fields.rb
+
+Rails/DangerousColumnNames:
+  Exclude:
+    - db/migrate/20170330131901_create_dmsf_folder_permissions.rb
+
+Rails/DynamicFindBy:
+  AllowedMethods:
+    - find_by_token
+    - find_by_param
+
+Rails/SkipsModelValidations:
+  Exclude:
+    - app/helpers/dmsf_upload_helper.rb # touch is Okay
+    - app/models/dmsf_workflow.rb # update doesn't work here
+    - lib/redmine_dmsf/patches/user_patch.rb
+    - lib/redmine_dmsf/patches/role_patch.rb
+    - db/migrate/20170526144701_dmsf_attachable.rb
+    - db/migrate/20170421101901_dmsf_file_container_rollback.rb
+    - db/migrate/20170118142001_dmsf_file_container.rb
+    - db/migrate/20160222140401_approval_workflow_std_fields.rb
+    - db/migrate/20160215125801_approval_workflow_status.rb
+    - db/migrate/20140519133201_trash_bin.rb
+    - db/migrate/07_dmsf_1_4_4.rb
+    - db/migrate/20240829093801_rename_dmsf_digest_token.rb
+
+Rails/ThreeStateBooleanColumn:
+  Exclude:
+    - db/migrate/04_dmsf_0_9_0.rb
+    - db/migrate/20170217141601_add_dmsf_not_inheritable_to_custom_fields.rb
+
+Rails/UniqueValidationWithoutIndex:
+  Exclude:
+    - app/models/dmsf_folder.rb # TODO: Create a case insensitive index in DB migrations
+    - app/models/dmsf_file.rb
+    - app/models/dmsf_workflow_step.rb # Impossible due to steps sorting
+
+Style/ExpandPathArguments:
+  Enabled: false
+
+Style/FrozenStringLiteralComment:
+  Exclude:
+    - init.rb
+
+Style/OpenStructUse:
+  Exclude:
+    - lib/dav4rack/utils.rb
+
+Style/OptionalBooleanParameter:
+  Exclude:
+    - lib/redmine_dmsf/field_formats/dmsf_file_format.rb
+    - lib/redmine_dmsf/field_formats/dmsf_file_revision_format.rb

CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as contributors and maintainers pledge to making participation in our project and our community a harassment-free experience for everyone, regardless of age, body size, disability, ethnicity, gender identity and expression, level of experience, nationality, personal appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable behavior and are expected to take appropriate and fair corrective action in response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct, or to ban temporarily or permanently any contributor for other behaviors that they deem inappropriate, threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces when an individual is representing the project or its community. Examples of representing a project or community include using an official project e-mail address, posting via an official social media account, or acting as an appointed representative at an online or offline event. Representation of a project may be further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by contacting the project team at karel.picman@kontron.com. The project team will review and investigate all complaints, and will respond in a way that it deems appropriate to the circumstances. The project team is obligated to maintain confidentiality with regard to the reporter of an incident. Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good faith may face temporary or permanent repercussions as determined by other members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4, available at [http://contributor-covenant.org/version/1/4][version]
+
+[homepage]: http://contributor-covenant.org
+[version]: http://contributor-covenant.org/version/1/4/

CONTRIBUTING.md

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+## How to contribute to Redmine DMSF plugin
+
+#### **Did you find a bug?**
+
+* **Ensure the bug was not already reported** by searching on GitHub under [Issues](https://github.com/danmunn/redmine_dmsf/issues).
+* If you're unable to find an open issue addressing the problem, [open a new one](https://github.com/danmunn/redmine_dmsf/issues/new). Be sure to include a **title and clear description**, as much relevant information as possible, **Redmine and the plugin version**, a part of the **production.log** related to the issue and **screen-shots**.
+
+#### **A wrong or missing translation?**
+
+* Feel free to update language files (_config/locales/*.yml_) in your mother language or languages you are familiar with and send them back to us via a **pull request**.
+
+#### **Do you want to patch the existing code?**
+
+* Make a new fork of the current development branch (_devel_). Make your changes and [create a pull request](https://github.com/danmunn/redmine_dmsf/compare). Only pull requests into the **development branch** except those fixing serious errors will be accepted.

Gemfile

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+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Vít Jonáš <vit.jonas@gmail.com>, Daniel Munn <dan.munn@munnster.co.uk>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+source 'https://rubygems.org' do
+  gem 'ox' # Dav4Rack
+  gem 'rake' unless Dir.exist?(File.expand_path('../../redmine_dashboard', __FILE__))
+  gem 'uuidtools'
+  gem 'zip-zip' unless Dir.exist?(File.expand_path('../../vault', __FILE__))
+
+  # Redmine extensions
+  gem 'active_record_union'
+  gem 'simple_enum'
+  group :xapian do
+    gem 'xapian-ruby'
+  end
+  unless %w[easy_gantt custom_tables]
+         .any? { |plugin| Dir.exist?(File.expand_path("../../#{plugin}", __FILE__)) }
+    group :test do
+      gem 'rails-controller-testing'
+    end
+  end
+end

LICENSE.md

@@ -0,0 +1,617 @@
+# GNU GENERAL PUBLIC LICENSE
+
+Version 3, 29 June 2007
+
+Copyright (C) 2007 Free Software Foundation, Inc.
+<https://fsf.org/>
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+## Preamble
+
+The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works. By contrast,
+the GNU General Public License is intended to guarantee your freedom
+to share and change all versions of a program--to make sure it remains
+free software for all its users. We, the Free Software Foundation, use
+the GNU General Public License for most of our software; it applies
+also to any other work released this way by its authors. You can apply
+it to your programs, too.
+
+When we speak of free software, we are referring to freedom, not
+price. Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights. Therefore, you
+have certain responsibilities if you distribute copies of the
+software, or if you modify it: responsibilities to respect the freedom
+of others.
+
+For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received. You must make sure that they, too, receive
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+
+Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+For the developers' and authors' protection, the GPL clearly explains
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+
+Some devices are designed to deny users access to install or run
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+systematic pattern of such abuse occurs in the area of products for
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+
+Finally, every program is threatened constantly by software patents.
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+assures that patents cannot be used to render the program non-free.
+
+The precise terms and conditions for copying, distribution and
+modification follow.
+
+## TERMS AND CONDITIONS
+
+### 0. Definitions.
+
+"This License" refers to version 3 of the GNU General Public License.
+
+"Copyright" also means copyright-like laws that apply to other kinds
+of works, such as semiconductor masks.
+
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+infringement under applicable copyright law, except executing it on a
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+
+To "convey" a work means any kind of propagation that enables other
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+conveying.
+
+An interactive user interface displays "Appropriate Legal Notices" to
+the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
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+the interface presents a list of user commands or options, such as a
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+
+### 1. Source Code.
+
+The "source code" for a work means the preferred form of the work for
+making modifications to it. "Object code" means any non-source form of
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+
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+-   a) The work must carry prominent notices stating that you modified
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+### 6. Conveying Non-Source Forms.
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+    for any liability that these contractual assumptions directly
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+
+All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10. If the Program as you
+received it, or any part of it, contains a notice stating that it is
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+a further restriction but permits relicensing or conveying under this
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+
+Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions; the
+above requirements apply either way.
+
+### 8. Termination.
+
+You may not propagate or modify a covered work except as expressly
+provided under this License. Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+However, if you cease all violation of this License, then your license
+from a particular copyright holder is reinstated (a) provisionally,
+unless and until the copyright holder explicitly and finally
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+
+Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License. If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+### 9. Acceptance Not Required for Having Copies.
+
+You are not required to accept this License in order to receive or run
+a copy of the Program. Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance. However,
+nothing other than this License grants you permission to propagate or
+modify any covered work. These actions infringe copyright if you do
+not accept this License. Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+### 10. Automatic Licensing of Downstream Recipients.
+
+Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License. You are not responsible
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+
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+organization, or merging organizations. If propagation of a covered
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+
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+not impose a license fee, royalty, or other charge for exercise of
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+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+### 11. Patents.
+
+A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based. The
+work thus licensed is called the contributor's "contributor version".
+
+A contributor's "essential patent claims" are all patent claims owned
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+consequence of further modification of the contributor version. For
+purposes of this definition, "control" includes the right to grant
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+
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+patent license under the contributor's essential patent claims, to
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+patent license for this particular work, or (3) arrange, in a manner
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+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
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+
+A patent license is "discriminatory" if it does not include within the
+scope of its coverage, prohibits the exercise of, or is conditioned on
+the non-exercise of one or more of the rights that are specifically
+granted under this License. You may not convey a covered work if you
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+license was granted, prior to 28 March 2007.
+
+Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+### 12. No Surrender of Others' Freedom.
+
+If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License. If you cannot convey a
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+consequence you may not convey it at all. For example, if you agree to
+terms that obligate you to collect a royalty for further conveying
+from those to whom you convey the Program, the only way you could
+satisfy both those terms and this License would be to refrain entirely
+from conveying the Program.
+
+### 13. Use with the GNU Affero General Public License.
+
+Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
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+combined work, and to convey the resulting work. The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+### 14. Revised Versions of this License.
+
+The Free Software Foundation may publish revised and/or new versions
+of the GNU General Public License from time to time. Such new versions
+will be similar in spirit to the present version, but may differ in
+detail to address new problems or concerns.
+
+Each version is given a distinguishing version number. If the Program
+specifies that a certain numbered version of the GNU General Public
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+of any later version published by the Free Software Foundation. If the
+Program does not specify a version number of the GNU General Public
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+Software Foundation.
+
+If the Program specifies that a proxy can decide which future versions
+of the GNU General Public License can be used, that proxy's public
+statement of acceptance of a version permanently authorizes you to
+choose that version for the Program.
+
+Later license versions may give you additional or different
+permissions. However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+### 15. Disclaimer of Warranty.
+
+THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT
+WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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+PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE
+DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
+CORRECTION.
+
+### 16. Limitation of Liability.
+
+IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR
+CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES
+ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT
+NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR
+LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM
+TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER
+PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+
+### 17. Interpretation of Sections 15 and 16.
+
+If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.

README.md

@@ -0,0 +1,339 @@
+# Redmine DMSF Plugin 4.2.3
+
+[![GitHub CI](https://github.com/picman/redmine_dmsf/actions/workflows/rubyonrails.yml/badge.svg?branch=master)](https://github.com/picman/redmine_dmsf/actions/workflows/rubyonrails.yml)
+[![Support Ukraine Badge](https://bit.ly/support-ukraine-now)](https://github.com/support-ukraine/support-ukraine)
+
+Redmine DMSF is Document Management System Features plugin for Redmine issue tracking system; It is aimed to replace current Redmine's Documents module.
+
+Redmine DMSF now comes bundled with WebDAV functionality: if switched on within plugin settings this will be accessible from _/dmsf/webdav_.
+
+WebDAV functionality is provided through Dav4Rack library.
+
+The development has been supported by [Kontron](https://www.kontron.com) and has been released as open source thanks to their generosity.
+Project home: <https://github.com/picman/redmine_dmsf>
+
+Redmine Document Management System "Features" plugin is distributed under GNU General Public License v3 (GPL).
+33Redmine is a flexible project management web application, released under the terms of the GNU General Public License v2 (GPL) at <https://www.redmine.org/>
+
+Further information about the GPL license can be found at
+<https://www.gnu.org/licenses/gpl-3.0.html>
+
+## Features
+
+  * Directory structure
+  * Document versioning / revision history
+  * Document locking
+  * Multi (drag/drop depending on browser) upload/download
+  * Direct document or document link sending via email
+  * Configurable document approval workflow
+  * Document access auditing
+  * Integration with Redmine's activity feed
+  * Wiki macros for a quick content linking
+  * Full read/write WebDAV functionality
+  * Optional document content full-text search
+  * Documents and folders' symbolic links
+  * Trash bin
+  * Documents attachable to issues
+  * Office documents are displayed inline
+  * Editing of office documents
+  * REST API
+  * DMS Document revision as a custom field type
+  * Compatible with Redmine 6
+
+## Dependencies
+
+  * Redmine 6.1 or higher
+
+### Full-text search (optional)
+
+#### Indexing
+
+If you want to use full-text search features, you must setup file content indexing.
+
+It is necessary to index DMSF files with omindex before searching attempts to receive some output:
+
+1. Change the configuration part of redmine_dmsf/extra/xapian_indexer.rb file according to your environment.
+   (The path to the index database set in xapian_indexer.rb must corresponds to the path set in the plugin's settings.)
+2. Run `ruby redmine_dmsf/extra/xapian_indexer.rb -v`
+
+This command should be run on regular basis (e.g. from cron)
+
+Example of cron job (once per hour at 8th minute):
+
+    8 * * * * root /usr/bin/ruby redmine_dmsf/extra/xapian_indexer.rb
+
+See redmine_dmsf/extra/xapian_indexer.rb for help.
+
+#### Searching
+
+If you want to use fulltext search abilities, install xapian packages. In case of using of Bitnami
+stack or Ruby installed via RVM it might be necessary to install Xapian bindings from sources. See https://xapian.org
+ for details.
+
+To index some files with omega you may have to install some other packages like
+xpdf, antiword, ...
+
+From Omega documentation:
+
+   * HTML (.html, .htm, .shtml, .shtm, .xhtml, .xhtm)
+   * PHP (.php) - our HTML parser knows to ignore PHP code
+   * text files (.txt, .text)
+   * SVG (.svg)
+   * CSV (Comma-Separated Values) files (.csv)
+   * PDF (.pdf) if pdftotext is available (comes with poppler or xpdf)
+   * PostScript (.ps, .eps, .ai) if ps2pdf (from ghostscript) and pdftotext (comes with poppler or xpdf) are available
+   * OpenOffice/StarOffice documents (.sxc, .stc, .sxd, .std, .sxi, .sti, .sxm, .sxw, .sxg, .stw) if unzip is available
+   * OpenDocument format documents (.odt, .ods, .odp, .odg, .odc, .odf, .odb, .odi, .odm, .ott, .ots, .otp, .otg, .otc, .otf, .oti, .oth) if unzip is available
+   * MS Word documents (.dot) if antiword is available (.doc files are left to libmagic, as they may actually be RTF (AbiWord saves RTF when asked to save as .doc, and Microsoft Word quietly loads RTF files with a .doc extension), or plain-text).
+   * MS Excel documents (.xls, .xlb, .xlt, .xlr, .xla) if xls2csv is available (comes with catdoc)
+   * MS Powerpoint documents (.ppt, .pps) if catppt is available (comes with catdoc)
+   * MS Office 2007 documents (.docx, .docm, .dotx, .dotm, .xlsx, .xlsm, .xltx, .xltm, .pptx, .pptm, .potx, .potm, .ppsx, .ppsm) if unzip is available
+   * Wordperfect documents (.wpd) if wpd2text is available (comes with libwpd)
+   * MS Works documents (.wps, .wpt) if wps2text is available (comes with libwps)
+   * MS Outlook message (.msg) if perl with Email::Outlook::Message and HTML::Parser modules is available
+   * MS Publisher documents (.pub) if pub2xhtml is available (comes with libmspub)
+   * AbiWord documents (.abw)
+   * Compressed AbiWord documents (.zabw)
+   * Rich Text Format documents (.rtf) if unrtf is available
+   * Perl POD documentation (.pl, .pm, .pod) if pod2text is available
+   * reStructured text (.rst, .rest) if rst2html is available (comes with docutils)
+   * Markdown (.md, .markdown) if markdown is available
+   * TeX DVI files (.dvi) if catdvi is available
+   * DjVu files (.djv, .djvu) if djvutxt is available
+   * XPS files (.xps) if unzip is available
+   * Debian packages (.deb, .udeb) if dpkg-deb is available
+   * RPM packages (.rpm) if rpm is available
+   * Atom feeds (.atom)
+   * MAFF (.maff) if unzip is available
+   * MHTML (.mhtml, .mht) if perl with MIME::Tools is available
+   * MIME email messages (.eml) and USENET articles if perl with MIME::Tools and HTML::Parser is available
+   * vCard files (.vcf, .vcard) if perl with Text::vCard is available
+
+You can use following commands to install some of the required indexing tools:
+
+On Debian use:
+
+```
+sudo apt-get install xapian-omega ruby-xapian libxapian-dev poppler-utils antiword unzip catdoc libwpd-tools \
+libwps-tools gzip unrtf catdvi djview djview3 uuid uuid-dev xz-utils libemail-outlook-message-perl
+```
+
+On Ubuntu use:
+
+```
+sudo apt-get install xapian-omega ruby-xapian libxapian-dev poppler-utils antiword  unzip catdoc libwpd-tools \
+libwps-tools gzip unrtf catdvi djview djview3 uuid uuid-dev xz-utils libemail-outlook-message-perl
+```
+
+On CentOS use:
+```
+sudo yum install xapian-core xapian-bindings-ruby libxapian-dev poppler-utils antiword unzip catdoc libwpd-tools \
+libwps-tools gzip unrtf catdvi djview djview3 uuid uuid-dev xz libemail-outlook-message-perl
+```
+
+## Inline displaying of office documents (optional)
+
+If LibreOffice binary `libreoffice` is present in the server, office documents (.odt, .ods,...) are displayed inline.
+The command must be runable by the web app's user. Test it in advance, e.g:
+
+`sudo -u www-data libreoffice --convert-to pdf my_document.odt`
+
+`libreoffice` package is available in the most of Linux distributions, e.g. on Debain based systems:
+
+```
+sudo apt install libreoffice liblibreoffice-java
+```
+
+## Usage
+
+DMSF is designed to act as project module, so it must be checked as an enabled module within the project settings.
+
+Search will now automatically search DMSF content when a Redmine search is performed, additionally a "Documents" and "Folders" check box will be visible, allowing you to search DMSF content exclusively.
+
+## Linking DMSF object from Wiki entries (macros)
+
+You can link DMSF object from Wikis using a macro tag `{{ }}`. List of available macros with their description is
+available from the wiki's toolbar.
+
+## Hooks
+
+You can implement these hooks in your plugin and extend DMSF functionality in certain events.
+
+E.g.
+
+    class DmsfUploadControllerHooks < Redmine::Hook::Listener
+
+        def dmsf_upload_controller_after_commit(context={})
+            context[:controller].flash[:info] = 'Okay'
+        end
+
+    end
+
+**dmsf_upload_controller_after_commit**
+
+Called after all uploaded files are committed.
+
+parameters: *files*
+
+**dmsf_helper_upload_after_commit**
+
+Called after an individual file is committed. The controller is not available.
+
+Parameters: *file*
+
+**dmsf_workflow_controller_before_approval**
+
+Called before an approval. If the hook returns false, the approval is not recorded.
+
+parameters: *revision*, *step_action*
+
+**dmsf_files_controller_before_view**
+
+Allows a preview of the file by an external plugin. If the hook returns true, the file is not sent by DMSF. It is
+expected that the file is sent by the hook.
+
+parameters: *file*
+
+## Setup / Upgrade
+
+You can either clone the master branch or download the latest zipped version. Before installing ensure that the Redmine
+instance is stopped.
+
+    git clone git@github.com:picman/redmine_dmsf.git
+
+    wget https://github.com/picman/redmine_dmsf/archive/master.zip
+
+1. In case of upgrade **BACKUP YOUR DATABASE, ORIGINAL PLUGIN AND THE FOLDER WITH DOCUMENTS** first!!!
+2. Put redmine_dmsf plugin directory into plugins. The plugins sub-directory must be named just **redmine_dmsf**. In case
+   of need rename _redmine_dmsf-x.y.z_ to *redmine_dmsf*.
+3. **Go to the redmine directory**
+
+    `cd redmine`
+
+4. Install dependencies:
+
+    `bundle install`
+
+   4.1 In production environment
+
+        bundle config set --local without 'development test'
+        bundle install
+
+   4.2 Without Xapian fulltext search (on Windows)
+
+        bundle config set --local without 'xapian'
+        bundle install
+
+5. Initialize/Update database:
+
+   `RAILS_ENV=production bundle exec rake redmine:plugins:migrate NAME=redmine_dmsf`
+
+6. Install assets
+
+   `RAILS_ENV="production" bundle exec rake assets:precompile`
+
+7. The access rights must be set for web server, e.g.:
+
+    `chown -R www-data:www-data plugins/redmine_dmsf`
+
+8. Restart the web server, e.g.:
+
+    `systemctl restart apache2`
+
+9. You should configure the plugin via Redmine interface: Administration -> Plugins -> DMSF -> Configure. (You should check and then save the plugin's configuration after each upgrade.)
+10. Don't forget to grant permissions for DMSF in Administration -> Roles and permissions
+11. Assign DMSF permissions to appropriate roles.
+12. There are a few rake tasks:
+
+    I) To convert documents from the standard Redmine document module
+
+        Available options:
+
+            * project - id or identifier of a project (default to all projects)
+            * dry_run - perform just a check without any conversion
+            * issues - Convert also files attached to issues
+
+        Example:
+
+            rake redmine:dmsf_convert_documents project=test RAILS_ENV="production"
+
+            (If you don't run the rake task as the web server user, don't forget to change the ownership of the imported files, e.g.
+              chown -R www-data:www-data /redmine/files/dmsf
+            afterwards)
+
+    II) To alert all users who are expected to do an approval in the current approval steps
+
+        Example:
+
+            rake redmine:dmsf_alert_approvals RAILS_ENV="production"
+
+    III) To create missing checksums for all document revisions
+
+        Available options:
+
+          * dry_run - test, no changes to the database
+          * forceSHA256 - replace old MD5 with SHA256
+
+        Example:
+
+          bundle exec rake redmine:dmsf_create_digests RAILS_ENV="production"
+          bundle exec rake redmine:dmsf_create_digests forceSHA256=1 RAILS_ENV="production"
+          bundle exec rake redmine:dmsf_create_digests dry_run=1 RAILS_ENV="production"
+
+    IV) To maintain DMSF
+
+        * Remove all files with no database record from the document directory
+        * Remove all links project_id = -1 (added links to an issue which hasn't been created)
+
+        Available options:
+
+          * dry_run - No physical deletion but to list of all unused files only
+
+        Example:
+
+          rake redmine:dmsf_maintenance RAILS_ENV="production"
+          rake redmine:dmsf_maintenance dry_run=1 RAILS_ENV="production"
+
+### WebDAV
+
+In order to enable WebDAV module, it is necessary to put the following code into yor `config/additional_environment.rb`
+
+```ruby
+# Redmine DMSF's WebDAV
+require Rails.root.join('plugins', 'redmine_dmsf', 'lib', 'redmine_dmsf', 'webdav', 'custom_middleware').to_s
+config.middleware.insert_before ActionDispatch::Cookies, RedmineDmsf::Webdav::CustomMiddleware
+```
+
+### Installation in a sub-uri
+
+In order to documents and folders are available via WebDAV in case that the Redmine is configured to be run in a sub-uri
+it's necessary to add the following configuration option into your `config/additional_environment.rb`:
+
+```ruby
+config.relative_url_root = '/redmine'
+```
+
+## Uninstalling DMSF
+
+Before uninstalling the DMSF plugin, please ensure that the Redmine instance is stopped.
+
+1. `cd [redmine-install-dir]`
+2. `rake redmine:plugins:migrate NAME=redmine_dmsf VERSION=0 RAILS_ENV=production`
+3. `rm plugins/redmine_dmsf -Rf`
+
+After these steps re-start your instance of Redmine.
+
+## Contributing
+
+If you've added something, why not share it. Fork the repository (github.com/picman/redmine_dmsf),
+make the changes and send a pull request to the maintainers.
+
+Changes with tests, and full documentation are preferred.
+
+## Additional Documentation
+
+[CHANGELOG.md](CHANGELOG.md) - Project changelog
+
+---
+
+Special thanks to <a href="https://jetbrains.com"><img src="jetbrains-variant-3.svg" alt="JetBrains logo" width="59"  height="68"></a> for providing an excellent IDE.

app/controllers/dmsf_context_menus_controller.rb

@@ -0,0 +1,158 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+require "#{File.dirname(__FILE__)}/../../lib/redmine_dmsf/preview"
+
+# Context menu controller
+class DmsfContextMenusController < ApplicationController
+  helper :context_menus
+  helper :watchers
+  helper :dmsf
+
+  before_action :find_folder
+  before_action :find_dmsf_file
+  before_action :find_dmsf_folder
+  before_action :find_dmsf_project
+
+  def dmsf
+    if @dmsf_file
+      @locked = @dmsf_file.locked?
+      @project = @dmsf_file.project
+      @allowed = User.current.allowed_to? :file_manipulation, @project
+      @unlockable = @allowed && @dmsf_file.unlockable? && (!@dmsf_file.locked_for_user? ||
+          User.current.allowed_to?(:force_file_unlock, @project))
+      @email_allowed = User.current.allowed_to?(:email_documents, @project)
+      @preview = RedmineDmsf.office_bin.present? && RedmineDmsf::Preview.office_available?
+    elsif @dmsf_folder
+      @locked = @dmsf_folder.locked?
+      @project = @dmsf_folder.project
+      @allowed = User.current.allowed_to?(:folder_manipulation, @project)
+      @unlockable = @allowed && @dmsf_folder.unlockable? && (!@dmsf_folder.locked_for_user? ||
+        User.current.allowed_to?(:force_file_unlock, @project))
+      @email_allowed = User.current.allowed_to?(:email_documents, @project)
+    elsif @dmsf_link # url link
+      @locked = false
+      @unlockable = false
+      @project = @dmsf_link.project
+      @allowed = User.current.allowed_to? :file_manipulation, @project
+      @email_allowed = false
+    elsif @dmsf_project # project
+      @locked = false
+      @unlockable = false
+      @project = @dmsf_project
+      @allowed = User.current.allowed_to? :view_project_watchers, @project
+      @email_allowed = false
+    else # multiple selection
+      @project = project
+      @locked = false
+      @unlockable = false
+      @allowed = User.current.allowed_to?(:file_manipulation, @project) &&
+                 User.current.allowed_to?(:folder_manipulation, @project)
+      @email_allowed = User.current.allowed_to?(:email_documents, @project)
+    end
+    @back_url = params['back_url'].presence || dmsf_folder_path(id: @project, folder_id: @folder)
+    @notifications = Setting.notified_events.include?('dmsf_legacy_notifications')
+    render layout: false
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+
+  def trash
+    if @dmsf_file
+      @project = @dmsf_file.project
+      @allowed_restore = User.current.allowed_to? :file_manipulation, @project
+      @allowed_delete = User.current.allowed_to? :file_delete, @project
+    elsif @dmsf_folder
+      @project = @dmsf_folder.project
+      @allowed_restore = User.current.allowed_to? :folder_manipulation, @project
+      @allowed_delete = @allowed_restore
+    elsif @dmsf_link # url link
+      @project = @dmsf_link.project
+      @allowed_restore = User.current.allowed_to? :file_manipulation, @project
+      @allowed_delete = User.current.allowed_to? :file_delete, @project
+    else # multiple selection
+      @project = project
+      @allowed_restore = User.current.allowed_to?(:file_manipulation, @project) &&
+                         User.current.allowed_to?(:folder_manipulation, @project)
+      @allowed_delete = User.current.allowed_to?(:file_delete, @project) &&
+                        User.current.allowed_to?(:folder_manipulation, @project)
+    end
+    render layout: false
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+
+  private
+
+  def project
+    prj = nil
+    params[:ids].each do |id|
+      item = case id
+             when /file-(\d+)/
+               DmsfFile.find_by(id: Regexp.last_match(1))
+             when /(file|url)-link-(\d+)/
+               DmsfLink.find_by(id: Regexp.last_match(2))
+             when /folder-(\d+)/
+               DmsfFolder.find_by(id: Regexp.last_match(1))
+             when /folder-link-(\d+)/
+               DmsfLink.find_by(id: Regexp.last_match(1))
+             end
+      prj ||= item&.project
+      return nil if prj != item&.project
+    end
+    prj
+  end
+
+  def find_folder
+    @folder = DmsfFolder.find params[:folder_id] if params[:folder_id].present?
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+
+  def find_dmsf_file
+    return unless params[:ids].present? && params[:ids].size == 1 && !@dmsf_folder
+
+    case params[:ids][0]
+    when /file-(\d+)/
+      @dmsf_file = DmsfFile.find_by(id: Regexp.last_match(1))
+    when /(file|url)-link-(\d+)/
+      @dmsf_link = DmsfLink.find_by(id: Regexp.last_match(2))
+      @dmsf_file = DmsfFile.find_by(id: @dmsf_link.target_id) if @dmsf_link && @dmsf_link.target_type != 'DmsfUrl'
+    end
+  end
+
+  def find_dmsf_folder
+    return unless params[:ids].present? && params[:ids].size == 1 && !@dmsf_file
+
+    case params[:ids][0]
+    when /folder-(\d+)/
+      @dmsf_folder = DmsfFolder.find_by(id: Regexp.last_match(1))
+    when /folder-link-(\d+)/
+      @dmsf_link = DmsfLink.find_by(id: Regexp.last_match(1))
+      @dmsf_folder = DmsfFolder.find_by(id: @dmsf_link.target_id) if @dmsf_link
+    end
+  end
+
+  def find_dmsf_project
+    return unless params[:ids].present? && params[:ids].size == 1 && !@dmsf_project &&
+                  params[:ids][0] =~ /project-(\d+)/
+
+    @dmsf_project = Project.find_by(id: Regexp.last_match(1))
+  end
+end

app/controllers/dmsf_controller.rb

@@ -0,0 +1,855 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+#  Vít Jonáš <vit.jonas@gmail.com>, Daniel Munn <dan.munn@munnster.co.uk>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+require "#{File.dirname(__FILE__)}/../../lib/redmine_dmsf/dmsf_zip"
+
+# DMSF controller
+class DmsfController < ApplicationController
+  include RedmineDmsf::DmsfZip
+
+  before_action :find_project, except: %i[expand_folder index digest reset_digest]
+  before_action :authorize, except: %i[expand_folder index digest reset_digest]
+  before_action :authorize_global, only: [:index]
+  before_action :find_folder,
+                except: %i[new create edit_root save_root add_email append_email autocomplete_for_user digest
+                           reset_digest]
+  before_action :find_parent, only: %i[new create delete]
+  before_action :permissions?
+  # Also try to lookup folder by title if this is an API call
+  before_action :find_folder_by_title, only: [:show]
+  before_action :query, only: %i[expand_folder show trash empty_trash index]
+  before_action :project_roles, only: %i[new edit create save]
+  before_action :find_target_folder, only: %i[copymove entries_operation]
+  before_action :check_target_folder, only: [:entries_operation]
+  before_action :require_login, only: %i[digest reset_digest]
+
+  accept_api_auth :show, :create, :save, :delete, :entries_operation
+
+  helper :custom_fields
+  helper :dmsf_folder_permissions
+  helper :queries
+  include QueriesHelper
+  helper :dmsf_queries
+  include DmsfQueriesHelper
+  helper :context_menus
+  helper :watchers
+
+  def permissions?
+    if !DmsfFolder.permissions?(@folder, allow_system: false)
+      render_403
+    elsif @folder && @project && (@folder.project != @project)
+      render_404
+    end
+    true
+  end
+
+  def expand_folder
+    @idnt = params[:idnt].present? ? params[:idnt].to_i + 1 : 0
+    @query.project = Project.find_by(id: params[:project_id]) if params[:project_id].present?
+    @query.dmsf_folder_id = @folder&.id
+    @query.deleted = false
+    @query.sub_projects = true
+    respond_to do |format|
+      format.js { render action: 'query_rows' }
+    end
+  end
+
+  def index
+    @query.sub_projects = true
+    show
+  end
+
+  def show
+    @system_folder = @folder&.system
+    @locked = @folder&.locked?
+    @folder_manipulation_allowed = User.current.allowed_to?(:folder_manipulation, @project)
+    @file_manipulation_allowed = User.current.allowed_to?(:file_manipulation, @project)
+    @trash_enabled = @folder_manipulation_allowed && @file_manipulation_allowed
+    @notifications = Setting.notified_events.include?('dmsf_legacy_notifications')
+    @query.dmsf_folder_id = @folder&.id
+    @query.deleted = false
+    @query.sub_projects |= RedmineDmsf.dmsf_projects_as_subfolders?
+    if @folder&.deleted? || (params[:folder_title].present? && !@folder)
+      render_404
+      return
+    end
+    if @query.valid?
+      respond_to do |format|
+        format.html do
+          # Warn about searching in sub-folders
+          if @folder && params['set_filter'].present? && params['f'].present?
+            flash.now[:warning] = l(:notice_search_in_subfolders)
+          end
+          @dmsf_count = @query.dmsf_count
+          @dmsf_pages = Paginator.new @dmsf_count, per_page_option, params['page']
+          render layout: !request.xhr?
+        end
+        format.api { @offset, @limit = api_offset_and_limit }
+        format.csv do
+          send_data query_to_csv(@query.dmsf_nodes, @query), type: 'text/csv; header=present', filename: 'dmsf.csv'
+        end
+      end
+    else
+      respond_to do |format|
+        format.html do
+          @dmsf_count = 0
+          @dmsf_pages = Paginator.new @dmsf_count, per_page_option, params['page']
+          render layout: !request.xhr?
+        end
+        format.any(:atom, :csv, :pdf) { head :unprocessable_entity }
+        format.api { render_validation_errors(@query) }
+      end
+    end
+  end
+
+  def trash
+    @folder_manipulation_allowed = User.current.allowed_to? :folder_manipulation, @project
+    @file_manipulation_allowed = User.current.allowed_to? :file_manipulation, @project
+    @file_delete_allowed = User.current.allowed_to? :file_delete, @project
+    @query.deleted = true
+    respond_to do |format|
+      format.html do
+        @dmsf_count = @query.dmsf_count
+        @dmsf_pages = Paginator.new @dmsf_count, per_page_option, params['page']
+        render layout: !request.xhr?
+      end
+    end
+  end
+
+  def download_email_entries
+    file_path = helpers.email_entry_tmp_file_path(params[:entry])
+    if File.exist?(file_path)
+      # IE has got a tendency to cache files
+      expires_in 0.years, 'must-revalidate' => true
+      send_file(
+        file_path,
+        filename: 'Documents.zip',
+        type: 'application/zip',
+        disposition: 'attachment'
+      )
+    else
+      render_404
+    end
+  rescue StandardError => e
+    flash[:error] = e.message
+  end
+
+  def copymove
+    @ids = params[:ids].uniq
+    member = Member.find_by(project_id: @project.id, user_id: User.current.id)
+    @fast_links = member&.dmsf_fast_links
+    unless @fast_links
+      @projects = DmsfFolder.allowed_target_projects_on_copy
+      @folders = DmsfFolder.directory_tree(@target_project)
+      @target_folder = DmsfFolder.visible.find(params[:target_folder_id]) if params[:target_folder_id].present?
+    end
+    @back_url = params[:back_url]
+    render layout: !request.xhr?
+  end
+
+  def entries_operation
+    # Download/Email
+    if @selected_folders.blank? && @selected_files.blank? && @selected_links.blank?
+      flash[:warning] = l(:warning_no_entries_selected)
+      redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder)
+      return
+    end
+
+    if @selected_dir_links.present? && (params[:email_entries].present? || params[:download_entries].present?)
+      @selected_folders = DmsfLink.where(id: @selected_dir_links).pluck(:target_id) | @selected_folders
+    end
+
+    if @selected_file_links.present? && (params[:email_entries].present? || params[:download_entries].present?)
+      @selected_files = DmsfLink.where(id: @selected_file_links).pluck(:target_id) | @selected_files
+    end
+
+    begin
+      if params[:email_entries].present?
+        email_entries @selected_folders, @selected_files
+      elsif params[:restore_entries].present?
+        restore_entries @selected_folders, @selected_files, @selected_links
+        redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder)
+      elsif params[:delete_entries].present?
+        delete_entries @selected_folders, @selected_files, @selected_links, false
+        redirect_back_or_default dmsf_folder_path id: @project, folder_id: @folder
+      elsif params[:destroy_entries].present?
+        delete_entries @selected_folders, @selected_files, @selected_links, true
+        redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder)
+      elsif params[:copy_entries].present?
+        copy_entries @selected_folders, @selected_files, @selected_links
+        redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder)
+      elsif params[:move_entries].present?
+        move_entries @selected_folders, @selected_files, @selected_links
+        redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder)
+      else
+        download_entries @selected_folders, @selected_files
+      end
+    rescue DmsfFileNotFoundError
+      render_404
+    rescue DmsfAccessError
+      render_403
+    rescue StandardError => e
+      flash[:error] = e.message
+      Rails.logger.error e.message
+      redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder)
+    end
+  end
+
+  def entries_email
+    file_path = helpers.email_entry_tmp_file_path(params[:email][:zipped_content])
+    params[:email][:zipped_content] = file_path
+    if params[:email][:to].strip.blank?
+      flash[:error] = l(:error_email_to_must_be_entered)
+    else
+      DmsfMailer.deliver_send_documents @project, params[:email].permit!, User.current
+      if File.exist?(file_path)
+        File.delete(file_path)
+      else
+        flash[:error] = l(:header_minimum_filesize)
+      end
+      flash[:notice] = l(:notice_email_sent, params[:email][:to])
+    end
+    redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder)
+  end
+
+  def new
+    @folder = DmsfFolder.new
+    @pathfolder = @parent
+    render action: 'edit'
+  end
+
+  def edit
+    @parent = @folder.dmsf_folder
+    @pathfolder = copy_folder(@folder)
+    @force_file_unlock_allowed = User.current.allowed_to?(:force_file_unlock, @project)
+    @redirect_to_folder_id = params[:redirect_to_folder_id]
+    @notifications = Setting.notified_events.include?('dmsf_legacy_notifications')
+  end
+
+  def edit_root
+    @notifications = Setting.notified_events.include?('dmsf_legacy_notifications')
+  end
+
+  def create
+    @folder = DmsfFolder.new
+    @folder.project = @project
+    @folder.user = User.current
+    saved = @folder.update_from_params(params)
+    respond_to do |format|
+      format.js
+      format.api { render_validation_errors(@folder) unless saved }
+      format.html do
+        if saved
+          flash[:notice] = l(:notice_folder_created)
+          redirect_to dmsf_folder_path(id: @project, folder_id: @folder.dmsf_folder)
+        else
+          @pathfolder = @parent
+          render action: 'edit'
+        end
+      end
+    end
+  end
+
+  def save
+    unless params[:dmsf_folder]
+      redirect_to dmsf_folder_path(id: @project, folder_id: @folder)
+      return
+    end
+    @pathfolder = copy_folder(@folder)
+    saved = @folder.update_from_params(params)
+    respond_to do |format|
+      format.api { render_validation_errors(@folder) unless saved }
+      format.html do
+        if saved
+          flash[:notice] = l(:notice_folder_details_were_saved)
+          if @folder.project == @project
+            redirect_to_folder_id = params[:dmsf_folder][:redirect_to_folder_id]
+            redirect_to_folder_id = @folder.dmsf_folder.id if @folder.dmsf_folder && redirect_to_folder_id.blank?
+          end
+          redirect_to dmsf_folder_path(id: @project, folder_id: redirect_to_folder_id)
+        else
+          render action: 'edit'
+        end
+      end
+    end
+  end
+
+  def delete
+    commit = params[:commit] == 'yes'
+    result = @folder.delete(commit: commit)
+    if result
+      flash[:notice] = l(:notice_folder_deleted)
+    else
+      flash[:error] = @folder.errors.full_messages.to_sentence
+    end
+    respond_to do |format|
+      format.html do
+        if commit
+          redirect_to trash_dmsf_path(@project)
+        else
+          redirect_to dmsf_folder_path(id: @project, folder_id: @parent)
+        end
+      end
+      format.api { result ? render_api_ok : render_validation_errors(@folder) }
+    end
+  end
+
+  def restore
+    if @folder.restore
+      flash[:notice] = l(:notice_dmsf_folder_restored)
+    else
+      flash[:error] = @folder.errors.full_messages.to_sentence
+    end
+    redirect_to trash_dmsf_path(@project)
+  end
+
+  def save_root
+    if params[:project]
+      @project.dmsf_description = params[:project][:dmsf_description]
+      if @project.save
+        flash[:notice] = l(:notice_folder_details_were_saved)
+      else
+        flash[:error] = @project.errors.full_messages.to_sentence
+      end
+    end
+    redirect_to dmsf_folder_path(id: @project)
+  end
+
+  def notify_activate
+    if @folder&.notification || (@folder.nil? && @project.dmsf_notification)
+      flash[:warning] = l(:warning_folder_notifications_already_activated)
+    else
+      if @folder
+        @folder.notify_activate
+      else
+        @project.dmsf_notification = true
+        @project.save!
+      end
+      flash[:notice] = l(:notice_folder_notifications_activated)
+    end
+    redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder)
+  end
+
+  def notify_deactivate
+    if (@folder && !@folder.notification) || (@folder.nil? && !@project.dmsf_notification)
+      flash[:warning] = l(:warning_folder_notifications_already_deactivated)
+    else
+      if @folder
+        @folder.notify_deactivate
+      else
+        @project.dmsf_notification = nil
+        @project.save!
+      end
+      flash[:notice] = l(:notice_folder_notifications_deactivated)
+    end
+    redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder)
+  end
+
+  def lock
+    if @folder.nil?
+      flash[:warning] = l(:warning_folder_unlockable)
+    elsif @folder.locked?
+      flash[:warning] = l(:warning_folder_already_locked)
+    else
+      @folder.lock!
+      flash[:notice] = l(:notice_folder_locked)
+    end
+    redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder)
+  end
+
+  def unlock
+    if @folder.nil?
+      flash[:warning] = l(:warning_folder_unlockable)
+    elsif !@folder.locked?
+      flash[:warning] = l(:warning_folder_not_locked)
+    elsif @folder.locks[0].user == User.current || User.current.allowed_to?(:force_file_unlock, @project)
+      @folder.unlock!
+      flash[:notice] = l(:notice_folder_unlocked)
+    else
+      flash[:error] = l(:error_only_user_that_locked_folder_can_unlock_it)
+    end
+    redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder)
+  end
+
+  def add_email
+    @principals = users_for_new_users
+  end
+
+  def append_email
+    @principals = Principal.where(id: params[:user_ids]).to_a
+    head :success if @principals.blank?
+  end
+
+  def autocomplete_for_user
+    @principals = users_for_new_users
+    respond_to do |format|
+      format.js
+    end
+  end
+
+  # Move the dragged object to the given destination
+  def drop
+    result = false
+    object = nil
+    if params[:dmsf_folder].present? &&
+       params[:dmsf_folder][:drag_id].present? &&
+       params[:dmsf_folder][:drop_id].present? &&
+       params[:dmsf_folder][:drag_id] =~ /(.+)-(\d+)/
+      type = Regexp.last_match(1)
+      id = Regexp.last_match(2)
+      if params[:dmsf_folder][:drop_id] =~ /^(\d+)(p|f)span$/
+        case type
+        when 'file'
+          object = DmsfFile.find_by(id: id)
+        when 'folder'
+          object = DmsfFolder.find_by(id: id)
+        when 'file-link', 'folder-link', 'url-link'
+          object = DmsfLink.find_by(id: id)
+        end
+        if object
+          case Regexp.last_match(2)
+          when 'p'
+            project = Project.find_by(id: Regexp.last_match(1))
+            if project &&
+               User.current.allowed_to?(:file_manipulation, project) &&
+               User.current.allowed_to?(:folder_manipulation, project)
+              result = object.move_to(project, nil)
+            end
+          when 'f'
+            dmsf_folder = DmsfFolder.find_by(id: Regexp.last_match(1))
+            if dmsf_folder
+              if dmsf_folder == object.dmsf_folder
+                object.errors.add(:base, l(:error_target_folder_same))
+              elsif object.dmsf_folder&.locked_for_user?
+                object.errors.add(:base, l(:error_folder_is_locked))
+              else
+                result = object.move_to(dmsf_folder.project, dmsf_folder)
+              end
+            end
+          end
+        end
+      end
+    end
+    respond_to do |format|
+      if result
+        format.js { head :ok }
+      else
+        format.js do
+          if object
+            flash.now[:error] = object.errors.full_messages.to_sentence
+          else
+            head :unprocessable_entity
+          end
+        end
+      end
+    end
+  end
+
+  def empty_trash
+    @query.deleted = true
+    @query.dmsf_nodes.each do |node|
+      case node.type
+      when 'folder'
+        folder = DmsfFolder.find_by(id: node.id)
+        folder&.delete commit: true
+      when 'file'
+        file = DmsfFile.find_by(id: node.id)
+        file&.delete commit: true
+      when /link$/
+        link = DmsfLink.find_by(id: node.id)
+        link&.delete commit: true
+      end
+    end
+    redirect_back_or_default trash_dmsf_path id: @project
+  end
+
+  # Reset WebDAV digest
+  def digest; end
+
+  def reset_digest
+    if request.post?
+      raise StandardError, l(:notice_account_wrong_password) unless User.current.check_password?(params[:password])
+
+      # We have to create a token first to prevent an autogenerated token's value
+      token = Token.create!(user_id: User.current.id, action: 'dmsf_webdav_digest')
+      token.value = ActiveSupport::Digest.hexdigest(
+        "#{User.current.login}:#{RedmineDmsf::Webdav::AUTHENTICATION_REALM}:#{params[:password]}"
+      )
+      token.save
+      flash[:notice] = l(:notice_webdav_digest_reset)
+    end
+  rescue StandardError => e
+    flash[:error] = e.message
+  ensure
+    redirect_to my_account_path
+  end
+
+  private
+
+  def users_for_new_users
+    User.active.visible.member_of(@project).like(params[:q]).order(:type, :lastname).to_a
+  end
+
+  def email_entries(selected_folders, selected_files)
+    raise DmsfAccessError unless User.current.allowed_to?(:email_documents, @project)
+
+    zip = Zip.new
+    zip_entries(zip, selected_folders, selected_files)
+    zipped_content = zip.finish
+
+    max_filesize = RedmineDmsf.dmsf_max_email_filesize
+    raise DmsfEmailMaxFileSizeError if max_filesize.positive? && File.size(zipped_content) > max_filesize * 1_048_576
+
+    zip.dmsf_files.each do |f|
+      # Action
+      audit = DmsfFileRevisionAccess.new
+      audit.user = User.current
+      audit.dmsf_file_revision = f.last_revision
+      audit.action = DmsfFileRevisionAccess::EMAIL_ACTION
+      audit.save!
+    end
+
+    # Notification
+    begin
+      DmsfMailer.deliver_files_downloaded @project, zip.dmsf_files, request.remote_ip
+    rescue StandardError => e
+      Rails.logger.error "Could not send email notifications: #{e.message}"
+    end
+
+    @email_params = {
+      zipped_content: helpers.tmp_entry_identifier(zipped_content),
+      folders: selected_folders,
+      files: selected_files,
+      subject: "#{@project.name} #{l(:label_dmsf_file_plural).downcase}",
+      from: RedmineDmsf.dmsf_documents_email_from,
+      reply_to: RedmineDmsf.dmsf_documents_email_reply_to
+    }
+    @back_url = params[:back_url]
+    render action: 'email_entries'
+  ensure
+    zip&.close
+  end
+
+  def download_entries(selected_folders, selected_files)
+    zip = Zip.new
+    zip_entries(zip, selected_folders, selected_files)
+    zip.dmsf_files.each do |f|
+      # Action
+      audit = DmsfFileRevisionAccess.new
+      audit.user = User.current
+      audit.dmsf_file_revision = f.last_revision
+      audit.action = DmsfFileRevisionAccess::DOWNLOAD_ACTION
+      audit.save!
+    end
+    # Notifications
+    begin
+      DmsfMailer.deliver_files_downloaded @project, zip.dmsf_files, request.remote_ip
+    rescue StandardError => e
+      Rails.logger.error "Could not send email notifications: #{e.message}"
+    end
+    send_file(
+      zip.finish,
+      filename: filename_for_content_disposition("#{@project.name}-#{DateTime.current.strftime('%y%m%d%H%M%S')}.zip"),
+      type: 'application/zip',
+      disposition: 'attachment'
+    )
+  ensure
+    zip&.close
+  end
+
+  def zip_entries(zip, selected_folders, selected_files)
+    member = Member.find_by(user_id: User.current.id, project_id: @project.id)
+    selected_folders.each do |selected_folder_id|
+      folder = DmsfFolder.visible.find_by(id: selected_folder_id)
+      raise DmsfFileNotFoundError unless folder
+
+      zip.add_dmsf_folder folder, member, folder&.dmsf_folder&.dmsf_path_str
+    end
+    selected_files.each do |selected_file_id|
+      file = DmsfFile.visible.find_by(id: selected_file_id)
+      raise DmsfFileNotFoundError unless file&.last_revision && File.exist?(file.last_revision&.disk_file)
+
+      unless (file.project == @project) || User.current.allowed_to?(:view_dmsf_files, file.project)
+        raise DmsfAccessError
+      end
+
+      zip.add_dmsf_file file, member, file.dmsf_folder&.dmsf_path_str
+    end
+    max_files = RedmineDmsf.dmsf_max_file_download
+    raise DmsfZipMaxFilesError if max_files.positive? && zip.dmsf_files.length > max_files
+
+    zip
+  end
+
+  def restore_entries(selected_folders, selected_files, selected_links)
+    # Folders
+    selected_folders.each do |id|
+      folder = DmsfFolder.find_by(id: id)
+
+      raise DmsfFileNotFoundError unless folder
+    end
+    # Files
+    selected_files.each do |id|
+      file = DmsfFile.find_by(id: id)
+      raise DmsfFileNotFoundError unless file
+
+      flash[:error] = file.errors.full_messages.to_sentence unless file.restore
+    end
+    # Links
+    selected_links.each do |id|
+      link = DmsfLink.find_by(id: id)
+      raise DmsfFileNotFoundError unless link
+
+      flash[:error] = link.errors.full_messages.to_sentence unless link.restore
+    end
+  end
+
+  def delete_entries(selected_folders, selected_files, selected_links, commit)
+    # Folders
+    selected_folders.each do |id|
+      raise DmsfAccessError unless User.current.allowed_to?(:folder_manipulation, @project)
+
+      folder = DmsfFolder.find_by(id: id)
+      if folder
+        raise StandardError, folder.errors.full_messages.to_sentence unless folder.delete(commit: commit)
+      elsif !commit
+        raise DmsfFileNotFoundError
+      end
+    end
+    # Files
+    deleted_files = []
+    not_deleted_files = []
+    if selected_files.any?
+      raise DmsfAccessError unless User.current.allowed_to?(:file_delete, @project)
+
+      selected_files.each do |id|
+        file = DmsfFile.find_by(id: id)
+        if file
+          if file.delete(commit: commit)
+            deleted_files << file unless commit
+          else
+            not_deleted_files << file
+          end
+        elsif !commit
+          raise DmsfFileNotFoundError
+        end
+      end
+    end
+    # Activities
+    unless deleted_files.empty?
+      begin
+        recipients = DmsfMailer.deliver_files_deleted(@project, deleted_files)
+        if RedmineDmsf.dmsf_display_notified_recipients? && recipients.any?
+          max_receivers = RedmineDmsf.dmsf_max_notification_receivers_info
+          to = recipients.collect { |user, _| user.name }.first(max_receivers).join(', ')
+          if to.present?
+            to << (recipients.count > max_receivers ? ',...' : '.')
+            flash[:warning] = l(:warning_email_notifications, to: to)
+          end
+        end
+      rescue StandardError => e
+        Rails.logger.error "Could not send email notifications: #{e.message}"
+      end
+    end
+    unless not_deleted_files.empty?
+      flash[:warning] = l(:warning_some_entries_were_not_deleted, entries: not_deleted_files.map(&:title).join(', '))
+    end
+    # Links
+    if selected_links.any?
+      raise DmsfAccessError unless User.current.allowed_to?(:folder_manipulation, @project)
+
+      selected_links.each do |id|
+        link = DmsfLink.find_by(id: id)
+        link&.delete commit: commit
+      end
+    end
+    flash[:notice] = l(:notice_entries_deleted) if flash[:error].blank? && flash[:warning].blank?
+  end
+
+  def copy_entries(selected_folders, selected_files, selected_links)
+    # Folders
+    selected_folders.each do |id|
+      folder = DmsfFolder.find_by(id: id)
+      new_folder = folder.copy_to(@target_project, @target_folder)
+      raise(StandardError, new_folder.errors.full_messages.to_sentence) unless new_folder.errors.empty?
+    end
+    # Files
+    selected_files.each do |id|
+      file = DmsfFile.find_by(id: id)
+      new_file = file.copy_to(@target_project, @target_folder)
+      raise(StandardError, new_file.errors.full_messages.to_sentence) unless new_file.errors.empty?
+    end
+    # Links
+    selected_links.each do |id|
+      link = DmsfLink.find_by(id: id)
+      new_link = link.copy_to(@target_project, @target_folder)
+      raise(StandardError, new_link.errors.full_messages.to_sentence) unless new_link.errors.empty?
+    end
+    flash[:notice] = l(:notice_entries_copied) if flash[:error].blank? && flash[:warning].blank?
+  end
+
+  def move_entries(selected_folders, selected_files, selected_links)
+    # Permissions
+    raise DmsfAccessError if selected_folders.any? && !User.current.allowed_to?(:folder_manipulation, @project)
+
+    if (selected_folders.any? || selected_links.any?) && !User.current.allowed_to?(:file_manipulation, @project)
+      raise DmsfAccessError
+    end
+
+    # Folders
+    selected_folders.each do |id|
+      folder = DmsfFolder.find_by(id: id)
+      unless folder.move_to(@target_project, @target_folder)
+        raise(StandardError, folder.errors.full_messages.to_sentence)
+      end
+    end
+    # Files
+    selected_files.each do |id|
+      file = DmsfFile.find_by(id: id)
+      raise(StandardError, file.errors.full_messages.to_sentence) unless file.move_to(@target_project, @target_folder)
+    end
+    # Links
+    selected_links.each do |id|
+      link = DmsfLink.find_by(id: id)
+      raise(StandardError, link.errors.full_messages.to_sentence) unless link.move_to(@target_project, @target_folder)
+    end
+    flash[:notice] = l(:notice_entries_moved) if flash[:error].blank? && flash[:warning].blank?
+  end
+
+  def find_folder
+    @folder = DmsfFolder.find(params[:folder_id]) if params[:folder_id].present?
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+
+  def find_folder_by_title
+    return unless api_request? && !@folder && params[:folder_title].present?
+
+    @folder = DmsfFolder.find_by(title: params[:folder_title], project_id: @project.id)
+    render_404 unless @folder
+  end
+
+  def find_parent
+    @parent = DmsfFolder.visible.find params[:parent_id] if params[:parent_id].present?
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+
+  def copy_folder(folder)
+    copy = folder.clone
+    copy.id = folder.id
+    copy
+  end
+
+  def query
+    retrieve_default_query true
+    @query = retrieve_query DmsfQuery, true
+  end
+
+  def retrieve_default_query(use_session)
+    return if params[:query_id].present?
+    return if api_request?
+    return if params[:set_filter]
+
+    if params[:without_default].present?
+      params[:set_filter] = 1
+      return
+    end
+    if !params[:set_filter] && use_session && session[:issue_query]
+      query_id, project_id = session[:issue_query].values_at(:id, :project_id)
+      return if DmsfQuery.exists?(id: query_id) && project_id == @project&.id
+    end
+    default_query = DmsfQuery.default(project: @project)
+    return unless default_query
+
+    params[:query_id] = default_query.id
+  end
+
+  def project_roles
+    @project_roles = Role.givable.joins(:member_roles).joins(:members).where(members: { project_id: @project.id })
+                         .distinct
+  end
+
+  def find_target_folder
+    @target_project = if params[:dmsf_entries] && params[:dmsf_entries][:target_project_id].present?
+                        Project.find params[:dmsf_entries][:target_project_id]
+                      else
+                        @project
+                      end
+    if params[:dmsf_entries] && params[:dmsf_entries][:target_folder_id].present?
+      target_folder_id = params[:dmsf_entries][:target_folder_id]
+      @target_folder = DmsfFolder.find(target_folder_id)
+      raise ActiveRecord::RecordNotFound unless DmsfFolder.visible.exists?(id: target_folder_id)
+
+      @target_project = @target_folder&.project
+    end
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+
+  def check_target_folder
+    if params[:ids].present?
+      @selected_folders = params[:ids].grep(/folder-\d+/).map { |x| Regexp.last_match(1).to_i if x =~ /folder-(\d+)/ }
+      @selected_files = params[:ids].grep(/file-\d+/).map { |x| Regexp.last_match(1).to_i if x =~ /file-(\d+)/ }
+      @selected_dir_links = params[:ids].grep(/folder-link-\d+/)
+                                        .map { |x| Regexp.last_match(1).to_i if x =~ /folder-link-(\d+)/ }
+      @selected_file_links = params[:ids].grep(/file-link-\d+/)
+                                         .map { |x| Regexp.last_match(1).to_i if x =~ /file-link-(\d+)/ }
+      @selected_url_links = params[:ids].grep(/url-link-\d+/)
+                                        .map { |x| Regexp.last_match(1).to_i if x =~ /url-link-(\d+)/ }
+      @selected_links = @selected_dir_links + @selected_file_links + @selected_url_links
+    else
+      @selected_folders = []
+      @selected_files = []
+      @selected_links = []
+    end
+    return unless params[:copy_entries].present? || params[:move_entries].present?
+
+    begin
+      # Prevent copying/moving to the same destination
+      folders = DmsfFolder.where(id: @selected_folders).to_a
+      files = DmsfFile.where(id: @selected_files).to_a
+      links = DmsfLink.where(id: @selected_links).to_a
+      (folders + files + links).each do |entry|
+        if entry.dmsf_folder
+          raise DmsfParentError if entry.dmsf_folder == @target_folder || entry == @target_folder
+        elsif @target_folder.nil?
+          raise DmsfParentError if entry.project == @target_project
+        end
+      end
+      # Prevent recursion
+      if params[:move_entries].present?
+        folders.each do |entry|
+          raise DmsfParentError if entry.any_child?(@target_folder)
+        end
+      end
+      # Check permissions
+      if (@target_folder && (@target_folder.locked_for_user? ||
+         !DmsfFolder.permissions?(@target_folder, allow_system: false))) ||
+         !@target_project.allows_to?(:folder_manipulation)
+        raise DmsfAccessError
+      end
+    rescue DmsfParentError
+      flash[:error] = l(:error_target_folder_same)
+      redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder)
+    rescue DmsfAccessError
+      render_403
+    end
+  end
+end

app/controllers/dmsf_files_controller.rb

@@ -0,0 +1,378 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Vít Jonáš <vit.jonas@gmail.com>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Files controller
+class DmsfFilesController < ApplicationController
+  menu_item :dmsf
+
+  before_action :find_file, except: %i[delete_revision obsolete_revision]
+  before_action :find_revision, only: %i[delete_revision obsolete_revision]
+  before_action :find_folder, only: %i[delete create_revision]
+  before_action :authorize
+  before_action :permissions?
+
+  accept_api_auth :show, :view, :delete, :create_revision
+
+  helper :custom_fields
+  helper :dmsf_workflows
+  helper :dmsf
+  helper :queries
+  helper :watchers
+  helper :context_menus
+
+  include QueriesHelper
+
+  def permissions?
+    render_403 if @file && !DmsfFolder.permissions?(@file.dmsf_folder, allow_system: true, file: true)
+    true
+  end
+
+  def view
+    if params[:download].blank?
+      @revision = @file.last_revision
+    else
+      @revision = DmsfFileRevision.find(params[:download].to_i)
+      raise DmsfAccessError if @revision.dmsf_file != @file
+    end
+
+    check_project @revision.dmsf_file
+    raise ActionController::MissingFile if @file.deleted?
+
+    # Action
+    access = DmsfFileRevisionAccess.new
+    access.user = User.current
+    access.dmsf_file_revision = @revision
+    access.action = DmsfFileRevisionAccess::DOWNLOAD_ACTION
+    access.save!
+    # Notifications
+    begin
+      DmsfMailer.deliver_files_downloaded @project, [@file], request.remote_ip
+    rescue StandardError => e
+      Rails.logger.error "Could not send email notifications: #{e.message}"
+    end
+    # Allow a preview of the file by an external plugin
+    results = call_hook(:dmsf_files_controller_before_view, { file: @revision.disk_file })
+    return if results.first == true
+
+    member = Member.find_by(user_id: User.current.id, project_id: @file.project.id)
+    # IE has got a tendency to cache files
+    expires_in 0.years, 'must-revalidate' => true
+    # PDF preview
+    pdf_preview = (params[:disposition] != 'attachment') && params[:filename].blank? && @file.pdf_preview
+    filename = filename_for_content_disposition(@revision.formatted_name(member))
+    if !api_request? && pdf_preview.present? && (RedmineDmsf.office_bin.present? || params[:preview].present?)
+      basename = File.basename(filename, '.*')
+      send_file pdf_preview, filename: "#{basename}.pdf", type: 'application/pdf', disposition: 'inline'
+    # Text preview
+    elsif !api_request? && params[:download].blank? && (@file.size <= Setting.file_max_size_displayed.to_i.kilobyte) &&
+          (@file.text? || @file.markdown? || @file.textile?) && !@file.html? && formats.include?(:html)
+      @content = File.read(@revision.disk_file, mode: 'rb')
+      render action: 'document'
+    # Offer the file for download
+    else
+      params[:disposition] = 'attachment' if params[:filename].present?
+      send_file @revision.disk_file,
+                filename: filename,
+                type: @revision.detect_content_type,
+                disposition: params[:disposition].presence || @revision.dmsf_file.disposition
+    end
+  rescue DmsfAccessError => e
+    Rails.logger.error e.message
+    render_403
+  rescue StandardError => e
+    Rails.logger.error e.message
+    render_404
+  end
+
+  def show
+    @revision = @file.last_revision
+    @file_delete_allowed = User.current.allowed_to?(:file_delete, @project)
+    @file_manipulation_allowed = User.current.allowed_to?(:file_manipulation, @project)
+    @revision_count = @file.dmsf_file_revisions.visible.all.size
+    @revision_pages = Paginator.new @revision_count, params['per_page'] ? params['per_page'].to_i : 25, params['page']
+    @notifications = Setting.notified_events.include?('dmsf_legacy_notifications')
+
+    respond_to do |format|
+      format.html { render layout: !request.xhr? }
+      format.api
+    end
+  end
+
+  def create_revision
+    if params[:dmsf_file_revision] && !@file.locked_for_user?
+      revision = DmsfFileRevision.new
+      revision.title = params[:dmsf_file_revision][:title].scrub.strip
+      revision.name = params[:dmsf_file_revision][:name].scrub.strip
+      revision.description = params[:dmsf_file_revision][:description]&.scrub&.strip
+      revision.comment = params[:dmsf_file_revision][:comment]&.scrub&.strip
+      revision.dmsf_file = @file
+      last_revision = @file.last_revision
+      revision.source_revision = last_revision
+      revision.user = User.current
+
+      # Version
+      revision.major_version = DmsfUploadHelper.db_version(params[:version_major])
+      revision.minor_version = DmsfUploadHelper.db_version(params[:version_minor])
+      revision.patch_version = DmsfUploadHelper.db_version(params[:version_patch])
+
+      if params[:dmsf_attachments].present?
+        keys = params[:dmsf_attachments].keys
+        file_upload = params[:dmsf_attachments][keys.first] if keys&.first
+      end
+      if file_upload
+        upload = DmsfUpload.create_from_uploaded_attachment(@project, @folder, file_upload)
+        if upload
+          revision.size = upload.size
+          revision.disk_filename = revision.new_storage_filename
+          revision.mime_type = upload.mime_type
+          revision.digest = upload.digest
+        end
+      else
+        revision.size = last_revision.size
+        revision.disk_filename = last_revision.disk_filename
+        revision.mime_type = last_revision.mime_type
+        revision.digest = last_revision.digest
+      end
+      # Custom fields
+      revision.copy_custom_field_values(params[:dmsf_file_revision][:custom_field_values], last_revision)
+      @file.name = revision.name
+      ok = true
+      if revision.save
+        revision.assign_workflow params[:dmsf_workflow_id]
+        if upload
+          begin
+            FileUtils.mv upload.tempfile_path, revision.disk_file(search_if_not_exists: false)
+          rescue StandardError => e
+            Rails.logger.error e.message
+            flash[:error] = e.message
+            revision.destroy
+            ok = false
+          end
+        end
+        if ok && @file.locked? && !@file.locks.empty?
+          begin
+            @file.unlock!
+            flash[:notice] = "#{l(:notice_file_unlocked)}, "
+          rescue StandardError => e
+            Rails.logger.error "Cannot unlock the file: #{e.message}"
+            ok = false
+          end
+        end
+        if ok && @file.save
+          @file.last_revision = revision
+          call_hook :dmsf_helper_upload_after_commit, { file: @file }
+          begin
+            recipients = DmsfMailer.deliver_files_updated(@project, [@file])
+            if RedmineDmsf.dmsf_display_notified_recipients? && recipients.any?
+              max_notifications = RedmineDmsf.dmsf_max_notification_receivers_info
+              to = recipients.collect { |user, _| user.name }.first(max_notifications).join(', ')
+              if to.present?
+                to << (recipients.count > max_notifications ? ',...' : '.')
+              end
+            end
+          rescue StandardError => e
+            Rails.logger.error "Could not send email notifications: #{e.message}"
+          end
+        else
+          ok = false
+        end
+      else
+        ok = false
+      end
+    end
+
+    respond_to do |format|
+      format.html do
+        flash[:error] = l(:error_file_is_locked) if @file.locked_for_user?
+        flash[:warning] = l(:warning_email_notifications, to: to) if to.present?
+        flash[:error] = @file.errors.full_messages.to_sentence if @file.errors.any?
+        flash[:error] = revision.errors.full_messages.to_sentence if revision.errors.any?
+        flash[:notice] = (flash[:notice].nil? ? '' : flash[:notice]) + l(:notice_file_revision_created) if ok
+        redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder)
+      end
+      format.api
+    end
+  end
+
+  def delete
+    if @file
+      commit = params[:commit] == 'yes'
+      result = @file.delete(commit: commit)
+      if result
+        flash[:notice] = l(:notice_file_deleted)
+        if commit
+          container = @file.container
+          container&.dmsf_file_removed @file
+        else
+          begin
+            recipients = DmsfMailer.deliver_files_deleted(@project, [@file])
+            if RedmineDmsf.dmsf_display_notified_recipients? && recipients.any?
+              max_notification = RedmineDmsf.dmsf_max_notification_receivers_info
+              to = recipients.collect { |user, _| user.name }.first(max_notification).join(', ')
+              if to.present?
+                to << (recipients.count > max_notification ? ',...' : '.')
+                flash[:warning] = l(:warning_email_notifications, to: to)
+              end
+            end
+          rescue StandardError => e
+            Rails.logger.error "Could not send email notifications: #{e.message}"
+          end
+        end
+      else
+        msg = @file.errors.full_messages.to_sentence
+        flash[:error] = msg
+        Rails.logger.error msg
+      end
+    end
+    respond_to do |format|
+      format.html { redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder) }
+      format.api { result ? render_api_ok : render_validation_errors(@file) }
+    end
+  end
+
+  def delete_revision
+    if @revision
+      if @revision.delete commit: true
+        if @file.name != @file.last_revision.name
+          @file.name = @file.last_revision.name
+          @file.save!
+        end
+        flash[:notice] = l(:notice_revision_deleted)
+      else
+        flash[:error] = @revision.errors.full_messages.to_sentence
+      end
+    end
+    redirect_to action: 'show', id: @file
+  end
+
+  def obsolete_revision
+    if @revision
+      if @revision.obsolete
+        flash[:notice] = l(:notice_revision_obsoleted)
+      else
+        flash[:error] = @revision.errors.full_messages.to_sentence
+      end
+    end
+    redirect_to action: 'show', id: @file
+  end
+
+  def lock
+    if @file.locked?
+      flash[:warning] = l(:warning_file_already_locked)
+    else
+      begin
+        @file.lock!
+        flash[:notice] = l(:notice_file_locked)
+      rescue StandardError => e
+        flash[:error] = e.message
+      end
+    end
+    redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder)
+  end
+
+  def unlock
+    if @file.locked?
+      if @file.locks[0].user == User.current || User.current.allowed_to?(:force_file_unlock, @file.project)
+        begin
+          @file.unlock!
+          flash[:notice] = l(:notice_file_unlocked)
+        rescue StandardError => e
+          flash[:error] = e.message
+        end
+      else
+        flash[:error] = l(:error_only_user_that_locked_file_can_unlock_it)
+      end
+    else
+      flash[:warning] = l(:warning_file_not_locked)
+    end
+    redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder)
+  end
+
+  def notify_activate
+    if @file.notification
+      flash[:warning] = l(:warning_file_notifications_already_activated)
+    else
+      @file.notify_activate
+      flash[:notice] = l(:notice_file_notifications_activated)
+    end
+    redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder)
+  end
+
+  def notify_deactivate
+    if @file.notification
+      @file.notify_deactivate
+      flash[:notice] = l(:notice_file_notifications_deactivated)
+    else
+      flash[:warning] = l(:warning_file_notifications_already_deactivated)
+    end
+    redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder)
+  end
+
+  def restore
+    if @file.restore
+      flash[:notice] = l(:notice_dmsf_file_restored)
+    else
+      flash[:error] = @file.errors.full_messages.to_sentence
+    end
+    redirect_to trash_dmsf_path(@project)
+  end
+
+  def thumbnail
+    tbnail = @file.thumbnail(size: params[:size])
+    if tbnail
+      if stale?(etag: tbnail)
+        send_file tbnail,
+                  filename: filename_for_content_disposition(@file.last_revision.disk_file),
+                  type: @file.last_revision.detect_content_type,
+                  disposition: 'inline'
+      end
+    else
+      head :not_found
+    end
+  end
+
+  private
+
+  def find_file
+    @file = DmsfFile.find params[:id]
+    @project = @file.project
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+
+  def find_revision
+    @revision = DmsfFileRevision.visible.find params[:id]
+    @file = @revision.dmsf_file
+    @project = @file.project
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+
+  def find_folder
+    @folder = DmsfFolder.find params[:folder_id] if params[:folder_id].present?
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+
+  def check_project(entry)
+    return unless entry && entry.project != @project
+
+    raise DmsfAccessError, l(:error_entry_project_does_not_match_current_project)
+  end
+end

app/controllers/dmsf_folder_permissions_controller.rb

@@ -0,0 +1,81 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Folder permissions controller
+class DmsfFolderPermissionsController < ApplicationController
+  before_action :find_folder,
+                only: %i[destroy new autocomplete_for_user],
+                if: -> { params[:dmsf_folder_id].present? }
+  before_action :find_project
+  before_action :authorize
+  before_action :permissions?
+
+  helper :dmsf
+
+  def permissions?
+    render_403 unless DmsfFolder.permissions?(@dmsf_folder)
+    true
+  end
+
+  def new
+    @principals = users_for_new_users
+  end
+
+  def append
+    @principals = Principal.where(id: params[:user_ids]).to_a
+    head :ok if @principals.blank?
+  end
+
+  def autocomplete_for_user
+    @principals = users_for_new_users
+    respond_to do |format|
+      format.js
+    end
+  end
+
+  private
+
+  def users_for_new_users
+    scope = Principal.active.visible.member_of(@project).like(params[:q]).order(:type, :lastname)
+    if @dmsf_folder
+      users = @dmsf_folder.permissions_users
+      if users.any?
+        ids = users.collect(&:id)
+        scope = scope.where.not(id: ids)
+      end
+    end
+    scope.to_a
+  end
+
+  def find_project
+    @project = Project.visible.find_by_param(params[:project_id])
+  rescue DmsfAccessError
+    render_403
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+
+  def find_folder
+    @dmsf_folder = DmsfFolder.visible.find(params[:dmsf_folder_id])
+  rescue DmsfAccessError
+    render_403
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+end

app/controllers/dmsf_help_controller.rb

@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Help controller
+class DmsfHelpController < ApplicationController
+  def show_wiki_syntax
+    lang = current_language.to_s
+    template = "dmsf_help/#{lang}/wiki_syntax"
+    lang = 'en' unless lookup_context.exists?(template)
+    render template: "dmsf_help/#{lang}/wiki_syntax", layout: nil
+  end
+
+  def show_dmsf_help
+    lang = current_language.to_s
+    template = "dmsf_help/#{lang}/dmsf_help"
+    lang = 'en' unless lookup_context.exists?(template)
+    render template: "dmsf_help/#{lang}/dmsf_help", layout: nil
+  end
+end

app/controllers/dmsf_links_controller.rb

@@ -0,0 +1,222 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Links controller
+class DmsfLinksController < ApplicationController
+  model_object DmsfLink
+
+  before_action :find_model_object, only: %i[destroy restore]
+  before_action :find_link_project
+  before_action :find_folder, only: [:destroy]
+  before_action :authorize
+  before_action :permissions?
+
+  protect_from_forgery except: :new
+
+  accept_api_auth :create
+
+  helper :dmsf
+
+  def permissions?
+    render_403 if @dmsf_link && !DmsfFolder.permissions?(@dmsf_link.dmsf_folder)
+    true
+  end
+
+  def initialize
+    @dmsf_link = nil
+    super
+  end
+
+  def new
+    @dmsf_link = DmsfLink.new
+    member = Member.find_by(project_id: params[:project_id], user_id: User.current.id)
+    @fast_links = member&.dmsf_fast_links
+    @dmsf_link.project_id = params[:project_id]
+    @dmsf_link.dmsf_folder_id = params[:dmsf_folder_id]
+    @dmsf_file_id = params[:dmsf_file_id]
+    @type = params[:type]
+    @dmsf_link.target_project_id = params[:project_id]
+    @back_url = params[:back_url]
+    if @type == 'link_to'
+      if @dmsf_file_id
+        f = DmsfFile.find_by(id: @dmsf_file_id)
+        @dmsf_link.name = f&.last_revision&.title
+      else
+        titles = DmsfFolder.where(id: @dmsf_link.dmsf_folder_id).pluck(:title)
+        @dmsf_link.name = titles.first if titles.any?
+      end
+    end
+    @container = params[:container]
+    respond_to do |format|
+      format.html
+      format.js
+    end
+  end
+
+  def autocomplete_for_project
+    respond_to do |format|
+      format.js
+    end
+  end
+
+  def autocomplete_for_folder
+    respond_to do |format|
+      format.js
+    end
+  end
+
+  def create
+    @dmsf_link = DmsfLink.new
+    @dmsf_link.user = User.current
+    if params[:dmsf_link][:type] == 'link_from'
+      # Link from
+      if params[:dmsf_link][:container].blank?
+        @dmsf_link.project_id = params[:dmsf_link][:project_id]
+        @dmsf_link.dmsf_folder_id = params[:dmsf_link][:dmsf_folder_id]
+      else
+        # A container link
+        @dmsf_link.project_id = -1
+        @dmsf_link.dmsf_folder_id = nil
+      end
+      @dmsf_link.target_project_id = params[:dmsf_link][:target_project_id]
+      if params[:external_link] == 'true'
+        @dmsf_link.external_url = params[:dmsf_link][:external_url]
+        @dmsf_link.target_type = 'DmsfUrl'
+      elsif params[:dmsf_link][:target_file_id].present?
+        @dmsf_link.target_id = params[:dmsf_link][:target_file_id]
+        @dmsf_link.target_type = DmsfFile.model_name.to_s
+      else
+        @dmsf_link.target_id = if DmsfLinksHelper.number?(params[:dmsf_link][:target_folder_id])
+                                 params[:dmsf_link][:target_folder_id].to_i
+                               end
+        @dmsf_link.target_type = DmsfFolder.model_name.to_s
+      end
+      @dmsf_link.name = params[:dmsf_link][:name].scrub.strip
+      result = @dmsf_link.save
+      if result
+        flash[:notice] = l(:notice_successful_create)
+      else
+        msg = @dmsf_link.errors.full_messages.to_sentence
+        flash[:error] = msg
+        Rails.logger.error msg
+      end
+    else
+      # Link to
+      if DmsfLinksHelper.number?(params[:dmsf_link][:target_folder_id])
+        @dmsf_link.dmsf_folder_id = params[:dmsf_link][:target_folder_id].to_i
+      end
+      if params[:dmsf_link][:target_project_id].present?
+        @dmsf_link.project_id = params[:dmsf_link][:target_project_id]
+      else
+        project_ids = DmsfFolder.where(id: params[:dmsf_link][:target_folder_id]).pluck(:project_id)
+        unless project_ids.any?
+          render_404
+          return
+        end
+        @dmsf_link.project_id = project_ids.first
+      end
+      @dmsf_link.target_project_id = params[:dmsf_link][:project_id]
+      if params[:dmsf_link][:dmsf_file_id].present?
+        @dmsf_link.target_id = params[:dmsf_link][:dmsf_file_id]
+        @dmsf_link.target_type = DmsfFile.model_name.to_s
+      else
+        @dmsf_link.target_id = params[:dmsf_link][:dmsf_folder_id]
+        @dmsf_link.target_type = DmsfFolder.model_name.to_s
+      end
+      @dmsf_link.name = params[:dmsf_link][:name]
+      result = @dmsf_link.save
+      if result
+        flash[:notice] = l(:notice_successful_create)
+      else
+        flash[:error] = @dmsf_link.errors.full_messages.to_sentence
+      end
+    end
+    respond_to do |format|
+      format.html do
+        if params[:dmsf_link][:type] == 'link_from'
+          redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @dmsf_link.dmsf_folder_id)
+        elsif params[:dmsf_link][:dmsf_file_id].present?
+          redirect_back_or_default dmsf_file_path(@dmsf_link.target_file)
+        else
+          folder = @dmsf_link.target_folder.dmsf_folder if @dmsf_link.target_folder
+          redirect_back_or_default dmsf_folder_path(id: @project, folder_id: folder)
+        end
+      end
+      format.api { render_validation_errors(@dmsf_link) unless result }
+      format.js
+    end
+  end
+
+  def destroy
+    begin
+      if @dmsf_link
+        commit = params[:commit] == 'yes'
+        if @dmsf_link.delete(commit: commit)
+          flash[:notice] = l(:notice_successful_delete)
+        else
+          flash[:error] = @dmsf_link.errors.full_messages.to_sentence
+        end
+      end
+    rescue StandardError => e
+      errors.add :base, e.message
+      return false
+    end
+    redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder)
+  end
+
+  def restore
+    if @dmsf_link.restore
+      flash[:notice] = l(:notice_dmsf_link_restored)
+    else
+      flash[:error] = @dmsf_link.errors.full_messages.to_sentence
+    end
+    redirect_to trash_dmsf_path(@project)
+  end
+
+  private
+
+  def l_params
+    params.fetch(:dmsf_link, {}).permit(:project_id)
+  end
+
+  def find_link_project
+    if @dmsf_link
+      @project = @dmsf_link.project
+    else
+      pid = if params[:dmsf_link].present?
+              if params[:dmsf_link].fetch(:project_id, nil).blank?
+                params[:dmsf_link].fetch(:target_project_id, nil)
+              else
+                params[:dmsf_link][:project_id]
+              end
+            else
+              params[:project_id]
+            end
+      @project = Project.find(pid)
+    end
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+
+  def find_folder
+    @folder = DmsfFolder.find params[:folder_id] if params[:folder_id].present?
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+end

app/controllers/dmsf_public_urls_controller.rb

@@ -0,0 +1,47 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Public URL controller
+class DmsfPublicUrlsController < ApplicationController
+  model_object DmsfPublicUrl
+  before_action :authorize, only: [:create]
+  skip_before_action :check_if_login_required, only: [:show]
+
+  def show
+    dmsf_public_url = DmsfPublicUrl.where('token = ? AND expire_at >= ?', params[:token], DateTime.current).first
+    if dmsf_public_url
+      revision = dmsf_public_url.dmsf_file.last_revision
+      begin
+        # IE has got a tendency to cache files
+        expires_in(0.years, 'must-revalidate' => true)
+        send_file(revision.disk_file,
+                  filename: filename_for_content_disposition(revision.name),
+                  type: revision.detect_content_type,
+                  disposition: dmsf_public_url.dmsf_file.disposition)
+      rescue StandardError => e
+        Rails.logger.error e.message
+        render_404
+      end
+    else
+      render_404
+    end
+  end
+
+  def create; end
+end

app/controllers/dmsf_state_controller.rb

@@ -0,0 +1,53 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Vít Jonáš <vit.jonas@gmail.com>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# State controller
+class DmsfStateController < ApplicationController
+  menu_item :dmsf
+
+  before_action :find_project
+  before_action :authorize
+
+  def user_pref_save
+    member = @project.members.find_by(user_id: User.current.id)
+    if member
+      if Setting.notified_events.include?('dmsf_legacy_notifications')
+        member.dmsf_mail_notification = params[:email_notify]
+      end
+      member.dmsf_title_format = params[:title_format]
+      member.dmsf_fast_links = params[:fast_links].present?
+      if format_valid?(member.dmsf_title_format) && member.save
+        flash[:notice] = l(:notice_your_preferences_were_saved)
+      else
+        flash[:error] = l(:notice_your_preferences_were_not_saved)
+      end
+    else
+      flash[:warning] = l(:user_is_not_project_member)
+    end
+    @project.update(dmsf_act_as_attachable: params[:act_as_attachable]) if RedmineDmsf.dmsf_act_as_attachable?
+    @project.update default_dmsf_query_id: params[:default_dmsf_query]
+    redirect_to settings_project_path(@project, tab: 'dmsf')
+  end
+
+  private
+
+  def format_valid?(format)
+    format.blank? || (/%(t|d|v|i|r)/.match?(format) && format.length < 256)
+  end
+end

app/controllers/dmsf_upload_controller.rb

@@ -0,0 +1,154 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Vít Jonáš <vit.jonas@gmail.com>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Upload controller
+class DmsfUploadController < ApplicationController
+  menu_item :dmsf
+
+  before_action :find_project, except: %i[upload delete_dmsf_attachment delete_dmsf_link_attachment]
+  before_action :authorize, except: %i[upload delete_dmsf_attachment delete_dmsf_link_attachment]
+  before_action :authorize_global, only: %i[upload delete_dmsf_attachment delete_dmsf_link_attachment]
+  before_action :find_folder, except: %i[upload commit delete_dmsf_attachment delete_dmsf_link_attachment]
+  before_action :permissions?, except: %i[upload commit delete_dmsf_attachment delete_dmsf_link_attachment]
+
+  helper :custom_fields
+  helper :dmsf_workflows
+  helper :dmsf
+
+  accept_api_auth :upload, :commit
+
+  def permissions?
+    render_403 unless DmsfFolder.permissions?(@folder)
+    true
+  end
+
+  def upload_files
+    uploaded_files = params[:dmsf_attachments]
+    @uploads = []
+    # Commit
+    if params[:commit] == l(:label_dmsf_upload_commit)
+      uploaded_files&.each do |key, uploaded_file|
+        upload = DmsfUpload.create_from_uploaded_attachment(@project, @folder, uploaded_file)
+        next unless upload
+
+        @uploads.push upload
+        params[:committed_files][key][:disk_filename] = upload.disk_filename
+        params[:committed_files][key][:digest] = upload.digest
+        params[:committed_files][key][:tempfile_path] = upload.tempfile_path
+      end
+      commit_files if params[:committed_files].present?
+    # Upload
+    else
+      # standard file input uploads
+      uploaded_files&.each_value do |uploaded_file|
+        upload = DmsfUpload.create_from_uploaded_attachment(@project, @folder, uploaded_file)
+        @uploads.push(upload) if upload
+      end
+    end
+    flash.now[:error] = "#{l(:label_attachment)} #{l('activerecord.errors.messages.invalid')}" if @uploads.empty?
+  end
+
+  # REST API and Redmine attachment form
+  def upload
+    unless request.media_type == 'application/octet-stream'
+      head :not_acceptable
+      return
+    end
+
+    @attachment = Attachment.new(file: request.body)
+    @attachment.author = User.current
+    @attachment.filename = params[:filename].presence || Redmine::Utils.random_hex(16)
+    @attachment.content_type = params[:content_type].presence
+    begin
+      Attachment.skip_callback(:commit, :after, :reuse_existing_file_if_possible, raise: false)
+      saved = @attachment.save
+    ensure
+      Attachment.set_callback(:commit, :after, :reuse_existing_file_if_possible)
+    end
+
+    respond_to do |format|
+      format.js
+      format.api do
+        if saved
+          render action: 'upload', status: :created
+        else
+          render_validation_errors @attachment
+        end
+      end
+    end
+  end
+
+  def commit_files
+    commit_files_internal params[:committed_files]
+  end
+
+  # REST API file commit
+  def commit
+    @files = []
+    attachments = params[:attachments]
+    return unless attachments
+
+    @folder = DmsfFolder.visible.find_by(id: attachments[:folder_id]) if attachments[:folder_id].present?
+    # standard file input uploads
+    uploaded_files = attachments.slice('uploaded_file')
+    uploaded_files.each_value do |uploaded_file|
+      upload = DmsfUpload.create_from_uploaded_attachment(@project, @folder, uploaded_file)
+      next unless upload
+
+      uploaded_file[:disk_filename] = upload.disk_filename
+      uploaded_file[:tempfile_path] = upload.tempfile_path
+      uploaded_file[:size] = upload.size
+      uploaded_file[:digest] = upload.digest
+      uploaded_file[:mime_type] = upload.mime_type
+    end
+    commit_files_internal uploaded_files
+  end
+
+  def delete_dmsf_attachment
+    attachment = Attachment.find(params[:id])
+    attachment.destroy
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+
+  def delete_dmsf_link_attachment
+    link = DmsfLink.find(params[:id])
+    link.destroy
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+
+  private
+
+  def commit_files_internal(committed_files)
+    @files, failed_uploads = DmsfUploadHelper.commit_files_internal(committed_files, @project, @folder, self)
+    call_hook :dmsf_upload_controller_after_commit, { files: @files }
+    respond_to do |format|
+      format.js
+      format.api  { render_validation_errors(failed_uploads) unless failed_uploads.empty? }
+      format.html { redirect_to dmsf_folder_path(id: @project, folder_id: @folder) }
+    end
+  end
+
+  def find_folder
+    @folder = DmsfFolder.visible.find(params[:folder_id]) if params.key?('folder_id')
+  rescue DmsfAccessError
+    render_403
+  end
+end

app/controllers/dmsf_workflows_controller.rb

@@ -0,0 +1,544 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# WorkflowsController
+class DmsfWorkflowsController < ApplicationController
+  model_object DmsfWorkflow
+  menu_item :dmsf_approvalworkflows
+  self.main_menu = false
+
+  before_action :find_model_object, except: %i[create new index assign assignment]
+  before_action :find_project
+  before_action :authorize_custom
+  before_action :permissions?, only: %i[new_action assignment start]
+  before_action :approver_candidates, only: %i[remove_step show reorder_steps add_step]
+  before_action :prevent_from_editing, only: %i[destroy remove_step update add_step update_step reorder_steps]
+
+  layout :workflows_layout
+
+  helper :dmsf
+
+  def permissions?
+    revision = DmsfFileRevision.find_by(id: params[:dmsf_file_revision_id]) if params[:dmsf_file_revision_id].present?
+    render_403 unless revision&.dmsf_file || DmsfFolder.permissions?(revision&.dmsf_file&.dmsf_folder)
+    true
+  end
+
+  def initialize
+    @dmsf_workflow = nil
+    @project = nil
+    super
+  end
+
+  def index
+    @status = params[:status] || 1
+    @workflow_pages, @workflows = paginate(DmsfWorkflow.status(@status).global.sorted, per_page: 25)
+    @path = dmsf_workflows_path
+  end
+
+  def action
+    # Noting to do
+  end
+
+  def show
+    # Noting to do
+  end
+
+  def new_action
+    unless params[:commit] == l(:button_submit) && request.post?
+      redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder)
+      return
+    end
+
+    action = DmsfWorkflowStepAction.new(
+      dmsf_workflow_step_assignment_id: params[:dmsf_workflow_step_assignment_id],
+      action: params[:step_action].to_i >= 10 ? DmsfWorkflowStepAction::ACTION_DELEGATE : params[:step_action],
+      note: params[:note]
+    )
+    revision = DmsfFileRevision.find_by(id: params[:dmsf_file_revision_id])
+    result = call_hook(:dmsf_workflow_controller_before_approval,
+                       { dmsf_file_revision: revision, step_action: params[:step_action] })
+    if (result.blank? || result.first) && action.save
+      if revision
+        if @dmsf_workflow.try_finish? revision, action, (params[:step_action].to_i / 10)
+          if revision.dmsf_file
+            begin
+              revision.dmsf_file.unlock!(force_file_unlock_allowed: true) unless RedmineDmsf.dmsf_keep_documents_locked?
+            rescue DmsfLockError => e
+              flash[:info] = e.message
+            end
+          end
+          if revision.workflow == DmsfWorkflow::STATE_APPROVED
+            # Just approved
+            if Setting.notified_events.include?('dmsf_workflow_plural')
+              recipients = DmsfMailer.get_notify_users(@project, revision.dmsf_file, force_notification: true)
+              DmsfMailer.deliver_workflow_notification(
+                recipients,
+                @dmsf_workflow,
+                revision,
+                :text_email_subject_approved,
+                :text_email_finished_approved,
+                :text_email_to_see_history
+              )
+              if RedmineDmsf.dmsf_display_notified_recipients? && recipients.present?
+                max_notifications = RedmineDmsf.dmsf_max_notification_receivers_info
+                to = recipients.collect(&:name).first(max_notifications).join(', ')
+                if to.present?
+                  to << (recipients.count > max_notifications ? ',...' : '.')
+                  flash[:warning] = l(:warning_email_notifications, to: to)
+                end
+              end
+            end
+          elsif Setting.notified_events.include?('dmsf_workflow_plural') # Just rejected
+            recipients = @dmsf_workflow.participiants
+            recipients.push revision.dmsf_workflow_assigned_by_user
+            recipients.uniq!
+            recipients &= DmsfMailer.get_notify_users(@project, revision.dmsf_file, force_notification: true)
+            DmsfMailer.deliver_workflow_notification(
+              recipients,
+              @dmsf_workflow,
+              revision,
+              :text_email_subject_rejected,
+              :text_email_finished_rejected,
+              :text_email_to_see_history,
+              action.note
+            )
+            if RedmineDmsf.dmsf_display_notified_recipients? && recipients.present?
+              max_notifications = RedmineDmsf.dmsf_max_notification_receivers_info
+              to = recipients.collect(&:name).first(max_notifications).join(', ')
+              if to.present?
+                to << (recipients.count > max_notifications ? ',...' : '.')
+                flash[:warning] = l(:warning_email_notifications, to: to)
+              end
+            end
+          end
+        elsif action.action == DmsfWorkflowStepAction::ACTION_DELEGATE
+          # Delegation
+          if Setting.notified_events.include?('dmsf_workflow_plural')
+            delegate = User.active.find_by(id: params[:step_action].to_i / 10)
+            if DmsfMailer.get_notify_users(@project, revision.dmsf_file, force_notification: true).include?(delegate)
+              DmsfMailer.deliver_workflow_notification(
+                [delegate],
+                @dmsf_workflow,
+                revision,
+                :text_email_subject_delegated,
+                :text_email_finished_delegated,
+                :text_email_to_proceed,
+                action.note,
+                action.dmsf_workflow_step_assignment.dmsf_workflow_step
+              )
+              if RedmineDmsf.dmsf_display_notified_recipients?
+                flash[:warning] = l(:warning_email_notifications, to: delegate.name)
+              end
+            end
+          end
+        else
+          # Next step
+          assignments = @dmsf_workflow.next_assignments revision.id
+          if assignments.any? &&
+             Setting.notified_events.include?('dmsf_workflow_plural') &&
+             assignments.first.dmsf_workflow_step.step != action.dmsf_workflow_step_assignment.dmsf_workflow_step.step
+            # Next step
+            assignments.each do |assignment|
+              next if assignment.user.nil? ||
+                      DmsfMailer.get_notify_users(@project, revision.dmsf_file, force_notification: true)
+                                .exclude?(assignment.user)
+
+              DmsfMailer.deliver_workflow_notification(
+                [assignment.user],
+                @dmsf_workflow,
+                revision,
+                :text_email_subject_requires_approval,
+                :text_email_finished_step,
+                :text_email_to_proceed,
+                nil,
+                assignment.dmsf_workflow_step
+              )
+            end
+            to = revision.dmsf_workflow_assigned_by_user
+            if to && DmsfMailer.get_notify_users(@project, revision.dmsf_file, force_notification: true)
+                               .include?(to)
+              DmsfMailer.deliver_workflow_notification(
+                [to],
+                @dmsf_workflow,
+                revision,
+                :text_email_subject_updated,
+                :text_email_finished_step_short,
+                :text_email_to_see_status
+              )
+            end
+            if RedmineDmsf.dmsf_display_notified_recipients?
+              recipients = assignments.collect(&:user)
+              recipients << to if to
+              recipients.uniq!
+              recipients &= DmsfMailer.get_notify_users(@project, revision.dmsf_file, force_notification: true)
+              unless recipients.empty?
+                max_notifications = RedmineDmsf.dmsf_max_notification_receivers_info
+                to = recipients.collect(&:name).first(max_notifications).join(', ')
+                if to.present?
+                  to << (recipients.count > max_notifications ? ',...' : '.')
+                  flash[:warning] = l(:warning_email_notifications, to: to)
+                end
+              end
+            end
+          end
+        end
+      end
+      flash[:notice] = l(:notice_successful_update)
+    elsif action.action != DmsfWorkflowStepAction::ACTION_APPROVE && action.note.blank?
+      flash[:error] = l(:error_empty_note)
+    end
+    redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder)
+  end
+
+  def assign; end
+
+  def assignment
+    if params[:commit] == l(:button_submit) && params[:dmsf_workflow_id].present? && params[:dmsf_workflow_id] != '-1'
+      # DMS file
+      if params[:dmsf_file_revision_id].present? && params[:dmsf_link_id].blank? && params[:attachment_id].blank?
+        revision = DmsfFileRevision.find_by(id: params[:dmsf_file_revision_id])
+        begin
+          if revision
+            @project ||= revision.dmsf_file.project
+            revision.set_workflow(params[:dmsf_workflow_id], params[:action])
+            revision.assign_workflow(params[:dmsf_workflow_id])
+            if request.post?
+              if revision.save
+                file = DmsfFile.find_by(id: revision.dmsf_file_id)
+                if file
+                  begin
+                    file.lock!
+                  rescue DmsfLockError => e
+                    Rails.logger.warn e.message
+                  end
+                  flash[:notice] = l(:notice_successful_update)
+                end
+              else
+                flash[:error] = l(:error_workflow_assign)
+              end
+            end
+          end
+        rescue StandardError => e
+          flash[:error] = e.message
+        end
+      # DMS link (attached)
+      elsif params[:dmsf_link_id].present?
+        @dmsf_link_id = params[:dmsf_link_id]
+        @dmsf_workflow_id = params[:dmsf_workflow_id]
+      # Attachment (attached)
+      elsif params[:attachment_id].present?
+        @attachment_id = params[:attachment_id]
+        @dmsf_workflow_id = params[:dmsf_workflow_id]
+      end
+    end
+    respond_to do |format|
+      format.html { redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder) }
+      format.js
+    end
+  end
+
+  def log
+    if params[:dmsf_file_revision_id].present?
+      @revision = DmsfFileRevision.find_by(id: params[:dmsf_file_revision_id])
+    elsif params[:dmsf_file_id].present?
+      dmsf_file = DmsfFile.find_by(id: params[:dmsf_file_id])
+      @revision = dmsf_file.last_revision if dmsf_file
+    elsif params[:dmsf_link_id].present?
+      dmsf_link = DmsfLink.find_by(id: params[:dmsf_link_id])
+      if dmsf_link
+        dmsf_file = dmsf_link.target_file
+        @revision = dmsf_file.last_revision
+      end
+    end
+    respond_to do |format|
+      format.html
+      format.js
+    end
+  end
+
+  def new
+    @dmsf_workflow = DmsfWorkflow.new
+    # Reload
+    if params[:dmsf_workflow] && params[:dmsf_workflow][:name].present?
+      @dmsf_workflow.name = params[:dmsf_workflow][:name]
+    elsif params[:dmsf_workflow] && params[:dmsf_workflow][:id].present?
+      names = DmsfWorkflow.where(id: params[:dmsf_workflow][:id]).pluck(:name)
+      @dmsf_workflow.name = names.first
+    end
+    render layout: !request.xhr?
+  end
+
+  def edit
+    redirect_to dmsf_workflow_path(@dmsf_workflow)
+  end
+
+  def create
+    if params[:dmsf_workflow]
+      if params[:dmsf_workflow][:id].to_i.positive?
+        wf = DmsfWorkflow.find_by(id: params[:dmsf_workflow][:id])
+        @dmsf_workflow = wf.copy_to(@project, params[:dmsf_workflow][:name]) if wf
+      else
+        @dmsf_workflow = DmsfWorkflow.new
+        @dmsf_workflow.name = params[:dmsf_workflow][:name]
+        @dmsf_workflow.project_id = @project.id if @project
+        @dmsf_workflow.author = User.current
+        @dmsf_workflow.save
+      end
+    end
+    if request.post? && @dmsf_workflow&.valid?
+      flash[:notice] = l(:notice_successful_create)
+      if @project
+        redirect_to settings_project_path(@project, tab: 'dmsf_workflow')
+      else
+        redirect_to dmsf_workflows_path
+      end
+    else
+      render action: 'new'
+    end
+  end
+
+  def update
+    if params[:dmsf_workflow]
+      res = @dmsf_workflow.update(name: params[:dmsf_workflow][:name]) if params[:dmsf_workflow][:name].present?
+      res = @dmsf_workflow.update(status: params[:dmsf_workflow][:status]) if params[:dmsf_workflow][:status].present?
+      if res
+        flash[:notice] = l(:notice_successful_update)
+        if @project
+          redirect_to settings_project_path(@project, tab: 'dmsf_workflow')
+        else
+          redirect_to dmsf_workflows_path
+        end
+      else
+        flash[:error] = @dmsf_workflow.errors.full_messages.to_sentence
+        redirect_to dmsf_workflow_path(@dmsf_workflow)
+      end
+    else
+      redirect_to dmsf_workflow_path(@dmsf_workflow)
+    end
+  end
+
+  def destroy
+    begin
+      @dmsf_workflow.destroy
+      flash[:notice] = l(:notice_successful_delete)
+    rescue StandardError
+      flash[:error] = l(:error_unable_delete_dmsf_workflow)
+    end
+    if @project
+      redirect_to settings_project_path(@project, tab: 'dmsf_workflow')
+    else
+      redirect_to dmsf_workflows_path
+    end
+  end
+
+  def autocomplete_for_user
+    respond_to do |format|
+      format.js
+    end
+  end
+
+  def new_step
+    @steps = @dmsf_workflow.dmsf_workflow_steps.select('step, MAX(name) AS name').group(:step)
+    respond_to do |format|
+      format.html
+      format.js
+    end
+  end
+
+  def add_step
+    if request.post?
+      step = if params[:step] == '0'
+               @dmsf_workflow.dmsf_workflow_steps.collect(&:step).uniq.count + 1
+             else
+               params[:step].to_i
+             end
+      operator = params[:commit] == l(:dmsf_and) ? DmsfWorkflowStep::OPERATOR_AND : DmsfWorkflowStep::OPERATOR_OR
+      user_ids = User.where(id: params[:user_ids]).ids
+      if user_ids.any?
+        user_ids.each do |user_id|
+          ws = DmsfWorkflowStep.new
+          ws.dmsf_workflow_id = @dmsf_workflow.id
+          ws.step = step
+          ws.user_id = user_id
+          ws.operator = operator
+          ws.name = params[:name]
+          if ws.save
+            @dmsf_workflow.dmsf_workflow_steps << ws
+          else
+            flash[:error] = ws.errors.full_messages.to_sentence
+          end
+        end
+      else
+        flash[:error] = l(:error_workflow_assign)
+      end
+    end
+    respond_to do |format|
+      format.html
+    end
+  end
+
+  def remove_step
+    if request.delete?
+      DmsfWorkflowStep.where(dmsf_workflow_id: @dmsf_workflow.id, step: params[:step]).find_each do |ws|
+        @dmsf_workflow.dmsf_workflow_steps.delete ws
+      end
+      @dmsf_workflow.dmsf_workflow_steps.each do |ws|
+        n = ws.step.to_i
+        next unless n > params[:step].to_i
+
+        ws.step = n - 1
+        flash[:error] = l(:notice_cannot_renumber_steps) unless ws.save
+      end
+    end
+    redirect_back_or_default dmsf_workflow_path(@dmsf_workflow)
+  end
+
+  def reorder_steps
+    if request.put?
+      if @assigned
+        flash[:error] = l(:error_dmsf_workflow_assigned)
+      else
+        @dmsf_workflow.reorder_steps params[:step].to_i, params[:dmsf_workflow][:position].to_i
+      end
+    end
+    respond_to do |format|
+      format.html
+      format.js
+    end
+  end
+
+  def start
+    revision = DmsfFileRevision.find_by(id: params[:dmsf_file_revision_id])
+    if revision
+      revision.set_workflow(@dmsf_workflow.id, params[:action])
+      if revision.save
+        if Setting.notified_events.include?('dmsf_workflow_plural')
+          @dmsf_workflow.notify_users(@project, revision, self)
+        end
+        flash[:notice] = l(:notice_workflow_started)
+      else
+        flash[:error] = l(:notice_cannot_start_workflow)
+      end
+    end
+    redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder)
+  end
+
+  def update_step
+    # Name
+    if params[:dmsf_workflow].present?
+      index = params[:step].to_i
+      step = @dmsf_workflow.dmsf_workflow_steps[index]
+      step.name = params[:dmsf_workflow][:step_name]
+      if step.save
+        @dmsf_workflow.dmsf_workflow_steps.where(step: step.step).find_each do |s|
+          s.name = step.name
+          flash[:error] = s.errors.full_messages.to_sentence unless s.save
+        end
+      else
+        flash[:error] = step.errors.full_messages.to_sentence
+      end
+    end
+    # Operators/Assignees
+    if params[:operator_step].present?
+      params[:operator_step].each do |id, operator|
+        step = DmsfWorkflowStep.find_by(id: id)
+        next unless step
+
+        step.operator = operator.to_i
+        step.user_id = params[:assignee][id]
+        next if step.save
+
+        flash[:error] = step.errors.full_messages.to_sentence
+        Rails.logger.error step.errors.full_messages.to_sentence
+      end
+    end
+    redirect_to dmsf_workflow_path(@dmsf_workflow)
+  end
+
+  def delete_step
+    step = DmsfWorkflowStep.find_by(id: params[:step])
+    if step
+      # Safe the name
+      if step.name.present?
+        @dmsf_workflow.dmsf_workflow_steps.each do |s|
+          if s.step == step.step
+            s.name = step.name
+            s.save!
+          end
+        end
+      end
+      # Destroy
+      step.destroy
+    end
+    redirect_to dmsf_workflow_path(@dmsf_workflow)
+  end
+
+  private
+
+  def find_project
+    if @dmsf_workflow
+      if @dmsf_workflow.project # Project workflow
+        @project = @dmsf_workflow.project
+      elsif params[:dmsf_file_revision_id].present? # Global workflow
+        revision = DmsfFileRevision.find_by(id: params[:dmsf_file_revision_id])
+        @project = revision.dmsf_file.project if revision&.dmsf_file
+      elsif params[:project_id].present?
+        @project = Project.find params[:project_id]
+      end
+    elsif params[:dmsf_workflow].present?
+      @project = Project.find params[:dmsf_workflow][:project_id]
+    elsif params[:project_id].present?
+      @project = Project.find params[:project_id]
+    elsif params[:id].present?
+      @project = Project.find(params[:id])
+    end
+  rescue ActiveRecord::RecordNotFound
+    @project = nil
+  end
+
+  def workflows_layout
+    @project ? 'base' : 'admin'
+  end
+
+  def authorize_custom
+    if @project
+      authorize
+    else
+      require_admin
+    end
+  end
+
+  def approver_candidates
+    @approving_candidates = @project ? @project.users.to_a : User.active.to_a
+  end
+
+  def prevent_from_editing
+    # A workflow in use can be neither edited nor deleted
+    @assigned = DmsfFileRevision.exists?(dmsf_workflow_id: @dmsf_workflow.id)
+    return unless @assigned && !request.put?
+
+    flash[:error] = l(:error_dmsf_workflow_assigned)
+    if @project
+      redirect_back_or_default settings_project_path(@project, tab: 'dmsf_workflow')
+    else
+      redirect_back_or_default dmsf_workflows_path
+    end
+  end
+end

app/errors/dmsf_access_error.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Vít Jonáš <vit.jonas@gmail.com>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Access error
+class DmsfAccessError < StandardError
+  # Nothing to do
+end

app/errors/dmsf_email_max_file_size_error.rb

@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Max file size error
+class DmsfEmailMaxFileSizeError < StandardError
+  include Redmine::I18n
+
+  def initialize(message = nil)
+    if message.present?
+      super
+    else
+      super(l(:error_max_email_filesize_exceeded, number: RedmineDmsf.dmsf_max_email_filesize))
+    end
+  end
+end

app/errors/dmsf_file_not_found_error.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Not found error
+class DmsfFileNotFoundError < StandardError
+  # nothing to do
+end

app/errors/dmsf_lock_error.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Daniel Munn <dan.munn@munnster.co.uk>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Lock error
+class DmsfLockError < StandardError
+  # Nothing to do
+end

app/errors/dmsf_parent_error.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Vít Jonáš <vit.jonas@gmail.com>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Parent error
+class DmsfParentError < StandardError
+  # Nothing to do
+end

app/errors/dmsf_zip_max_files_error.rb

@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# File count exceeded
+class DmsfZipMaxFilesError < StandardError
+  include Redmine::I18n
+
+  def initialize(message = nil)
+    if message.present?
+      super
+    else
+      super(l(:error_max_files_exceeded, number: RedmineDmsf.dmsf_max_file_download))
+    end
+  end
+end

app/helpers/dmsf_files_helper.rb

@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Files helper
+module DmsfFilesHelper
+  def clean_wiki_text(text)
+    # If there is <p> tag, the text is moved one column to the right by Redmin's CSS. A new line causes double new line.
+    text.gsub('<p>', '')
+        .gsub('</p>', '')
+        .gsub("\n\n", '<br>')
+        .gsub("\n\t", '<br>')
+  end
+
+  def render_document_content(dmsf_file, content)
+    if dmsf_file.markdown?
+      render partial: 'common/markup', locals: { markup_text_formatting: markdown_formatter, markup_text: content }
+    elsif dmsf_file.textile?
+      render partial: 'common/markup', locals: { markup_text_formatting: 'textile', markup_text: content }
+    else
+      render partial: 'common/file', locals: { content: content, filename: dmsf_file.name }
+    end
+  end
+end

app/helpers/dmsf_folder_permissions_helper.rb

@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Vít Jonáš <vit.jonas@gmail.com>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Folders permissions helper
+module DmsfFolderPermissionsHelper
+  def users_checkboxes(users, inherited: false)
+    s = []
+    id = inherited ? 'inherited_permissions[user_ids][]' : 'permissions[user_ids][]'
+    users.each do |user|
+      content = check_box_tag(id, user.id, true, disabled: inherited, id: nil) + user.name
+      s << content_tag(:label, content, id: "user_permission_ids_#{user.id}", class: 'inline')
+    end
+    safe_join s
+  end
+
+  def render_principals_for_new_folder_permissions(users)
+    principals_check_box_tags 'user_ids[]', users
+  end
+end

app/helpers/dmsf_helper.rb

@@ -0,0 +1,91 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Vít Jonáš <vit.jonas@gmail.com>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+require 'tmpdir'
+require 'csv'
+
+# DMSF helper
+module DmsfHelper
+  include Redmine::I18n
+
+  def self.temp_filename(filename)
+    filename = sanitize_filename(filename)
+    timestamp = DateTime.current.strftime('%y%m%d%H%M%S')
+    timestamp.succ! while Rails.root.join("tmp/#{timestamp}_#{filename}").exist?
+    "#{timestamp}_#{filename}"
+  end
+
+  def self.sanitize_filename(filename)
+    # Get only the filename, not the whole path
+    just_filename = File.basename(filename.gsub('\\\\', '/'))
+    # Replace all non alphanumeric, hyphens or periods with underscore
+    just_filename.gsub!(/[^\w.\-]/, '_')
+    # Keep the extension if any
+    if !/^[a-zA-Z0-9_.\-]*$/.match?(just_filename) && just_filename =~ /(.[a-zA-Z0-9]+)$/
+      extension = Regexp.last_match(1)
+      just_filename = Digest::SHA256.hexdigest(just_filename) << extension
+    end
+    just_filename
+  end
+
+  def plugin_asset_path(plugin, asset_type, source)
+    File.join('/plugin_assets', plugin.to_s, asset_type, source)
+  end
+
+  def render_principals_for_new_email(users)
+    principals_check_box_tags 'user_ids[]', users
+  end
+
+  def webdav_url(project, folder)
+    url = ["#{Setting.protocol}:/", Setting.host_name, 'dmsf', 'webdav']
+    if project
+      url << ERB::Util.url_encode(RedmineDmsf::Webdav::ProjectResource.create_project_name(project))
+      if folder
+        folders = []
+        while folder
+          folders << folder
+          folder = folder.dmsf_folder
+        end
+        folders.reverse_each do |f|
+          url << f.title
+        end
+      end
+    end
+    url << ''
+    url.join '/'
+  end
+
+  # Downloads zipped files securely by sanitizing the params[:entry]. Characters considered unsafe
+  # are replaced with a underscore. The file_path is joined with File.join instead of Rails.root.join to eliminate
+  # the risk of overriding the absolute path (Rails.root/tmp) with file_name when given as absoulte path too. This
+  # makes the path double secure.
+  def email_entry_tmp_file_path(entry)
+    sanitized_entry = DmsfHelper.sanitize_filename(entry)
+    file_name = "#{RedmineDmsf::DmsfZip::FILE_PREFIX}#{sanitized_entry}.zip"
+    Rails.root.join 'tmp', file_name
+  end
+
+  # Extracts the variable part of the temp file name to be used as identifier in the
+  # download email entries route.
+  def tmp_entry_identifier(zipped_content)
+    path = Pathname.new(zipped_content)
+    zipped_file = path.basename(path.extname).to_s
+    zipped_file.delete_prefix RedmineDmsf::DmsfZip::FILE_PREFIX
+  end
+end

app/helpers/dmsf_links_helper.rb

@@ -0,0 +1,48 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Links helper
+module DmsfLinksHelper
+  def folder_tree_options_for_select(folder_tree, options = {})
+    s = []
+    folder_tree.each do |name, id|
+      tag_options = { value: id }
+      tag_options[:selected] = 'selected' if id == options[:selected]
+      s << content_tag('option', name, tag_options)
+    end
+    safe_join s
+  end
+
+  # An integer test
+  def self.number?(str)
+    str&.match?(/\A\d+\Z/)
+  end
+
+  def files_for_select(project_id, folder_id = nil)
+    files = []
+    if DmsfLinksHelper.number?(folder_id)
+      folder = DmsfFolder.find_by(id: folder_id)
+      files = folder.dmsf_files.visible.to_a if folder
+    elsif project_id
+      project = Project.find_by(id: project_id)
+      files = project.dmsf_files.visible.to_a if project
+    end
+    files
+  end
+end

app/helpers/dmsf_queries_helper.rb

@@ -0,0 +1,326 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+#  Vít Jonáš <vit.jonas@gmail.com>, Daniel Munn <dan.munn@munnster.co.uk>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Queries helper
+module DmsfQueriesHelper
+  include ApplicationHelper
+
+  def column_value(column, item, value)
+    return super unless item.is_a?(DmsfFolder)
+
+    case column.name
+    when :modified
+      val = super
+      case item.type
+      when 'file'
+        file = DmsfFile.find_by(id: item.id)
+        if !item.deleted? && file&.locked?
+          return content_tag(:span, val) +
+                 link_to(sprite_icon('unlock', nil, icon_only: true, size: '12'),
+                         unlock_dmsf_files_path(id: file,
+                                                back_url: dmsf_folder_path(id: file.project,
+                                                                           folder_id: file.dmsf_folder)),
+                         title: l(:title_locked_by_user, user: file.locked_by), class: 'icon icon-unlock')
+        end
+      when 'folder'
+        folder = DmsfFolder.find_by(id: item.id)
+        if !item.deleted? && folder&.locked?
+          return content_tag(:span, val) +
+                 link_to(sprite_icon('unlock', nil, icon_only: true, size: '12'),
+                         unlock_dmsf_path(id: folder.project,
+                                          folder_id: folder.id,
+                                          back_url: dmsf_folder_path(id: folder.project,
+                                                                     folder_id: folder.dmsf_folder)),
+                         title: l(:title_locked_by_user, user: folder.locked_by), class: 'icon icon-unlock')
+        end
+      end
+      content_tag(:span, val) + content_tag(:span, '', class: 'icon icon-none')
+    when :id
+      case item.type
+      when 'file'
+        if item.deleted?
+          h(value)
+        else
+          link_to h(value), dmsf_file_path(id: item.id)
+        end
+      when 'file-link'
+        if item.deleted?
+          h(item.revision_id)
+        else
+          link_to h(item.revision_id), dmsf_file_path(id: item.revision_id)
+        end
+      when 'folder'
+        if item.id
+          if item.deleted?
+            h(value)
+          else
+            link_to h(value), edit_dmsf_path(id: item.project_id, folder_id: item.id)
+          end
+        elsif item.deleted?
+          h(item.project_id)
+        else
+          link_to h(item.project_id), edit_root_dmsf_path(id: item.project_id)
+        end
+      when 'folder-link'
+        if item.id
+          if item.deleted?
+            h(item.revision_id)
+          else
+            link_to h(item.revision_id), edit_dmsf_path(id: item.project_id, folder_id: item.revision_id)
+          end
+        elsif item.deleted?
+          h(item.project_id)
+        else
+          link_to h(item.project_id), edit_root_dmsf_path(id: item.project_id)
+        end
+      when 'project'
+        link_to h(item.project_id), edit_root_dmsf_path(id: item.project_id)
+      else
+        h(value)
+      end
+    when :author
+      if value
+        user = User.find_by(id: value)
+        if user
+          link_to user.name, user_path(id: value)
+        else
+          super
+        end
+      else
+        super
+      end
+    when :title
+      case item.type
+      when 'project'
+        tag = h("[#{value}]")
+        tag = if item.project.module_enabled?(:dmsf)
+                link_to(sprite_icon('folder', nil, icon_only: true), dmsf_folder_path(id: item.project),
+                        class: 'icon icon-folder') +
+                  link_to(tag, dmsf_folder_path(id: item.project), class: 'dmsf-label')
+              else
+                sprite_icon 'folder', tag
+              end
+        unless filter_any?
+          path = expand_folder_dmsf_path
+          columns = params['c']
+          if columns.present?
+            path << '?'
+            path << columns.map { |col| "c[]=#{col}" }.join('&')
+          end
+          tag = content_tag(
+            'span',
+            '',
+            class: 'dmsf-expander',
+            onclick: "dmsfToggle(this, '#{item.id}', null,'#{escape_javascript(path)}')"
+          ) + tag
+          tag = content_tag('div', tag, class: 'row-control dmsf-row-control')
+        end
+        tag += content_tag('div', item.filename, class: 'dmsf-filename')
+        if item.project.watched_by?(User.current)
+          tag += link_to(sprite_icon('unwatch', nil, icon_only: true, size: '12'),
+                         watch_path(object_type: 'project', object_id: item.project.id),
+                         title: l(:button_unwatch),
+                         method: 'delete',
+                         class: 'icon icon-fav')
+        end
+        tag
+      when 'folder'
+        if item&.deleted?
+          tag = content_tag(:span, sprite_icon('folder', h(value)), class: 'icon icon-folder')
+        else
+          tag = link_to(sprite_icon('folder', nil,
+                                    icon_only: true,
+                                    css_class: item.system ? 'dmsf-system' : ''),
+                        dmsf_folder_path(id: item.project, folder_id: item.id), class: 'icon icon-folder')
+          tag += link_to(h(value), dmsf_folder_path(id: item.project, folder_id: item.id), class: 'dmsf-label')
+          unless filter_any?
+            path = expand_folder_dmsf_path
+            columns = params['c']
+            if columns.present?
+              path << '?'
+              path << columns.map { |col| "c[]=#{col}" }.join('&')
+            end
+            tag = content_tag(
+              'span',
+              '',
+              class: 'dmsf-expander',
+              onclick: "dmsfToggle(this, '#{item.project.id}', '#{item.id}','#{escape_javascript(path)}')"
+            ) + tag
+            tag = content_tag('div', tag, class: 'row-control dmsf-row-control')
+          end
+        end
+        tag += content_tag('div', item.filename, class: 'dmsf-filename', title: l(:title_filename_for_download))
+        if !item&.deleted? && item.watched_by?(User.current)
+          tag += link_to(sprite_icon('unwatch', nil, icon_only: true, size: '12'),
+                         watch_path(object_type: 'dmsf_folder', object_id: item.id),
+                         title: l(:button_unwatch),
+                         method: 'delete',
+                         class: 'icon icon-fav')
+        end
+        tag
+      when 'folder-link'
+        if item&.deleted?
+          tag = content_tag(:span, sprite_icon('folder', h(value)), class: 'icon icon-folder')
+        else
+          # For links, we use revision_id containing dmsf_folder.id in fact
+          tag = link_to(sprite_icon('folder', nil, icon_only: true, css_class: 'dmsf-gray'),
+                        dmsf_folder_path(id: item.project, folder_id: item.revision_id), class: 'icon icon-folder')
+          tag += link_to(h(value), dmsf_folder_path(id: item.project, folder_id: item.revision_id), class: 'dmsf-label')
+          tag = content_tag('span', '', class: 'dmsf-expander') + tag unless filter_any?
+        end
+        tag + content_tag('div', item.filename, class: 'dmsf-filename', title: l(:label_target_folder))
+      when 'file', 'file-link'
+        icon_name = icon_for_mime_type(Redmine::MimeType.css_class_of(item.filename))
+        icon_class = icon_class_for_mime_type(item.filename)
+        if item&.deleted?
+          tag = content_tag(:span, sprite_icon(icon_name, h(value)), class: "icon #{icon_class}")
+        else
+          # For links, we use revision_id containing dmsf_file.id in fact
+          file_view_url = url_for(
+            { controller: :dmsf_files, action: 'view', id: item.type == 'file' ? item.id : item.revision_id }
+          )
+          content_type = Redmine::MimeType.of(item.filename)
+          content_type = 'application/octet-stream' if content_type.blank?
+          options = { class: "dmsf-label icon #{icon_class}",
+                      'data-downloadurl': "#{content_type}:#{h(value)}:#{file_view_url}" }
+          unless previewable?(item.filename, content_type)
+            options[:target] = '_blank'
+            options[:rel] = 'noopener'
+          end
+          tag = link_to(sprite_icon(icon_name,
+                                    nil,
+                                    icon_only: true,
+                                    css_class: item.type == 'file-link' ? 'dmsf-gray' : ''),
+                        file_view_url,
+                        options)
+          options[:class] = 'dmsf-label'
+          tag += link_to(h(value), file_view_url, options)
+          tag = content_tag('span', '', class: 'dmsf-expander') + tag unless filter_any?
+        end
+        member = Member.find_by(user_id: User.current.id, project_id: item.project_id)
+        revision = DmsfFileRevision.find_by(id: item.customized_id)
+        filename = revision ? revision.formatted_name(member) : item.filename
+        tag += content_tag('div', filename, class: 'dmsf-filename', title: l(:title_filename_for_download))
+        if (item.type == 'file') && !item&.deleted? && revision.dmsf_file&.watched_by?(User.current)
+          tag += link_to(sprite_icon('unwatch', nil, icon_only: true, size: '12'),
+                         watch_path(object_type: 'dmsf_file', object_id: item.id),
+                         title: l(:button_unwatch),
+                         method: 'delete',
+                         class: 'icon icon-fav')
+        end
+        tag
+      when 'url-link'
+        if item&.deleted?
+          tag = content_tag(:span, sprite_icon('link', h(value)), class: 'icon icon-link')
+        else
+          tag = link_to(sprite_icon('link', nil, icon_only: true, css_class: 'dmsf-gray'),
+                        item.filename,
+                        target: '_blank',
+                        rel: 'noopener',
+                        class: 'icon icon-link')
+          tag += link_to(h(value), item.filename, target: '_blank', rel: 'noopener')
+          tag = content_tag('span', '', class: 'dmsf-expander') + tag unless filter_any?
+        end
+        tag + content_tag('div', item.filename, class: 'dmsf-filename', title: l(:field_url))
+      else
+        h(value)
+      end
+    when :size
+      number_to_human_size value
+    when :workflow
+      if value
+        if item.workflow_id && !item&.deleted?
+          url = if item.type == 'file'
+                  log_dmsf_workflow_path project_id: item.project_id, id: item.workflow_id, dmsf_file_id: item.id
+                else
+                  log_dmsf_workflow_path project_id: item.project_id, id: item.workflow_id, dmsf_link_id: item.id
+                end
+          text, names = DmsfWorkflow.workflow_info(item.workflow, item.workflow_id, item.customized_id)
+          link_to h(text), url, remote: true, title: names
+        else
+          h(DmsfWorkflow.workflow_str(value.to_i))
+        end
+      else
+        super
+      end
+    when :comment
+      value.present? ? content_tag('div', textilizable(value), class: 'wiki') : ''
+    else
+      super
+    end
+  end
+
+  def csv_value(column, object, value)
+    case column.name
+    when :size
+      ActiveSupport::NumberHelper.number_to_human_size value
+    when :workflow
+      if value
+        text, _names = DmsfWorkflow.workflow_info(object.workflow, object.workflow_id, object.revision_id)
+        text
+      else
+        super
+      end
+    when :author
+      if value
+        user = User.find_by(id: value)
+        if user
+          user.name
+        else
+          super
+        end
+      end
+    else
+      super
+    end
+  end
+
+  def filter_any?
+    # :v - value, :op - operator
+    size = params[:op]&.keys&.size
+    if size
+      if (size == 1) && params[:op].key?('title') && params[:op]['title'] == '~' && params[:v]['title'].join.empty?
+        return false
+      end
+
+      return true
+    end
+    false
+  end
+
+  def previewable?(filename, content_type)
+    case content_type
+    when 'text/markdown', 'text/x-textile'
+      true
+    else
+      Redmine::MimeType.is_type?('text', filename) || Redmine::SyntaxHighlighting.filename_supported?(filename)
+    end
+  end
+
+  def icon_class_for_mime_type(mime)
+    case Redmine::MimeType.of(mime)
+    when 'application/pdf'
+      'icon-pdf'
+    when 'text/plain'
+      'icon-txt'
+    else
+      'icon-file'
+    end
+  end
+end

app/helpers/dmsf_upload_helper.rb

@@ -0,0 +1,214 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Upload helper
+module DmsfUploadHelper
+  include Redmine::I18n
+
+  def self.commit_files_internal(committed_files, project, folder, controller = nil, container = nil, new_object: false)
+    failed_uploads = []
+    files = []
+    if committed_files
+      failed_uploads = []
+      committed_files.each_value do |committed_file|
+        name = committed_file[:name]
+        new_revision = DmsfFileRevision.new
+        file = DmsfFile.visible.find_file_by_name(project, folder, name)
+        unless file
+          link = DmsfLink.find_link_by_file_name(project, folder, name)
+          file = link.target_file if link
+        end
+        if file
+          if file.last_revision
+            last_revision = file.last_revision
+            new_revision.source_revision = last_revision
+          end
+        else
+          file = DmsfFile.new
+          file.project_id = project.id
+          file.name = name
+          file.dmsf_folder = folder
+          file.notification = RedmineDmsf.dmsf_default_notifications?
+        end
+        if file.locked_for_user?
+          failed_uploads.push file
+          next
+        end
+
+        new_revision.dmsf_file = file
+        new_revision.user = User.current
+        new_revision.name = name
+        new_revision.title = committed_file[:title]
+        new_revision.description = committed_file[:description]
+        new_revision.comment = committed_file[:comment]
+        new_revision.major_version = if committed_file[:version_major].present?
+                                       DmsfUploadHelper.db_version committed_file[:version_major]
+                                     else
+                                       1
+                                     end
+        new_revision.minor_version = if committed_file[:version_minor].present?
+                                       DmsfUploadHelper.db_version committed_file[:version_minor]
+                                     end
+        new_revision.patch_version = if committed_file[:version_patch].present?
+                                       DmsfUploadHelper.db_version committed_file[:version_patch]
+                                     end
+        new_revision.mime_type = committed_file[:mime_type]
+        new_revision.size = committed_file[:size]
+        new_revision.digest = committed_file[:digest]
+        # Custom fields
+        new_revision.copy_custom_field_values(committed_file[:custom_field_values])
+        # Need to save file first to generate id for it in case of creation.
+        # File id is needed to properly generate revision disk filename
+        unless new_revision.valid?
+          Rails.logger.error new_revision.errors.full_messages.to_sentence
+          failed_uploads.push new_revision
+          next
+        end
+        unless file.save
+          Rails.logger.error file.errors.full_messages.to_sentence
+          failed_uploads.push file
+          next
+        end
+
+        new_revision.disk_filename = new_revision.new_storage_filename
+
+        if new_revision.save
+          new_revision.assign_workflow committed_file[:dmsf_workflow_id]
+          begin
+            # If the path is not present we get it from the token
+            if committed_file[:token].present?
+              a = Attachment.find_by_token(committed_file[:token])
+              committed_file[:tempfile_path] = a.diskfile if a
+            end
+            FileUtils.mv committed_file[:tempfile_path], new_revision.disk_file(search_if_not_exists: false)
+            FileUtils.chmod 'u=wr,g=r', new_revision.disk_file(search_if_not_exists: false)
+            file.last_revision = new_revision
+            files.push file
+            container.dmsf_file_added file if container && !new_object
+            Redmine::Hook.call_hook :dmsf_helper_upload_after_commit, { file: file }
+          rescue StandardError => e
+            Rails.logger.error e.message
+            controller.flash[:error] = e.message if controller
+            failed_uploads.push file
+          end
+        else
+          failed_uploads.push new_revision
+        end
+        # Approval workflow
+        next if committed_file[:workflow_id].blank?
+
+        wf = DmsfWorkflow.find_by(id: committed_file[:workflow_id])
+        next unless wf
+
+        # Assign the workflow
+        new_revision.set_workflow wf.id, 'assign'
+        new_revision.assign_workflow wf.id
+        # Start the workflow
+        new_revision.set_workflow wf.id, 'start'
+        if new_revision.save
+          wf.notify_users project, new_revision, controller
+          begin
+            file.lock!
+          rescue DmsfLockError => e
+            Rails.logger.warn e.message
+          end
+        else
+          Rails.logger.error l(:error_workflow_assign)
+        end
+      end
+      # Notifications
+      begin
+        recipients = DmsfMailer.deliver_files_updated(project, files)
+        if RedmineDmsf.dmsf_display_notified_recipients? && recipients.any?
+          max_recipients = RedmineDmsf.dmsf_max_notification_receivers_info
+          to = recipients.collect { |user, _| user.name }.first(max_recipients).join(', ')
+          if to.present?
+            to << (recipients.count > max_recipients ? ',...' : '.')
+            controller.flash[:warning] = l(:warning_email_notifications, to: to) if controller
+          end
+        end
+      rescue StandardError => e
+        Rails.logger.error "Could not send email notifications: #{e.message}"
+      end
+    end
+    if failed_uploads.present? && controller
+      controller.flash[:warning] = l(:warning_some_files_were_not_committed,
+                                     files: failed_uploads.pluck(:name).join(', '))
+    end
+    [files, failed_uploads]
+  end
+
+  # 0..99, A..Z except O
+  def self.major_version_select_options
+    (0..99).to_a + ('A'..'Y').to_a - ['O']
+  end
+
+  # 0..999, ' '
+  def self.minor_version_select_options
+    (0..999).to_a + [' ']
+  end
+
+  class << self
+    alias patch_version_select_options minor_version_select_options
+  end
+
+  # 1 -> 2, -1 -> -2, A -> B
+  def self.increase_version(version)
+    return nil unless version
+    return 1 if (version == ' ') || ((-version) == ' '.ord)
+
+    if Integer(version)
+      if version >= 0
+        if (version + 1) < 1000
+          version + 1
+        else
+          version
+        end
+      elsif -(version - 1) < 'Z'.ord
+        version - 1
+      else
+        version
+      end
+    end
+  rescue StandardError
+    if (version.ord + 1) < 'Z'.ord
+      (version.ord + 1).chr
+    else
+      version
+    end
+  end
+
+  # 1 -> 1, -65 -> A
+  def self.gui_version(version)
+    return ' ' unless version
+    return version if version >= 0
+
+    (-version).chr
+  end
+
+  # 1 -> 1, A -> -65
+  def self.db_version(version)
+    return nil if version.nil? || version == '&nbsp;'
+
+    version.to_i if Integer(version)
+  rescue StandardError
+    version = ' ' if version.blank?
+    -version.ord
+  end
+end

app/helpers/dmsf_workflows_helper.rb

@@ -0,0 +1,106 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Workflows helper
+module DmsfWorkflowsHelper
+  def render_principals_for_new_dmsf_workflow_users(workflow, dmsf_workflow_step_assignment_id = nil,
+                                                    dmsf_file_revision_id = nil)
+    scope = workflow.delegates(params[:q], dmsf_workflow_step_assignment_id, dmsf_file_revision_id)
+    principal_count = scope.count
+    principal_pages = Redmine::Pagination::Paginator.new principal_count, 100, params['page']
+    principals = scope.offset(principal_pages.offset).limit(principal_pages.per_page).to_a
+    # Delegation
+    s = []
+    s << if dmsf_workflow_step_assignment_id
+           content_tag(
+             'div',
+             content_tag('div', principals_radio_button_tags('step_action', principals),
+                         id: 'dmsf_users_for_delegate'),
+             class: 'objects-selection'
+           )
+         # New step
+         else
+           content_tag(
+             'div',
+             content_tag('div', principals_check_box_tags('user_ids[]', principals), id: 'users'),
+             class: 'objects-selection'
+           )
+         end
+    links = pagination_links_full(principal_pages, principal_count, per_page_links: false) do |text, parameters, _|
+      link_to text,
+              autocomplete_for_user_dmsf_workflow_path(workflow, parameters.merge(q: params[:q], format: 'js')),
+              remote: true
+    end
+    s << content_tag('span', links, class: 'pagination')
+    safe_join s
+  end
+
+  def dmsf_workflow_steps_options_for_select(steps)
+    options = [[l(:dmsf_new_step), 0]]
+    steps.each do |step|
+      options << [step.name.presence || step.step.to_s, step.step]
+    end
+    options_for_select options, 0
+  end
+
+  def dmsf_workflows_for_select(project, dmsf_workflow_id)
+    options = [['', -1]]
+    DmsfWorkflow.active.sorted.where(['project_id = ? OR project_id IS NULL', project&.id]).find_each do |wf|
+      options << if wf.project_id
+                   [wf.name, wf.id]
+                 else
+                   ["#{wf.name} #{l(:note_global)}", wf.id]
+                 end
+    end
+    options_for_select options, selected: dmsf_workflow_id
+  end
+
+  def dmsf_all_workflows_for_select(dmsf_workflow_id)
+    options = [['', 0]]
+    DmsfWorkflow.active.sorted.find_each do |wf|
+      if wf.project_id
+        prj = Project.find_by(id: wf.project_id)
+        if User.current.allowed_to?(:manage_workflows, prj)
+          # Local approval workflows
+          options << if prj
+                       ["#{wf.name} (#{prj.name})", wf.id]
+                     else
+                       [wf.name, wf.id]
+                     end
+        end
+      else
+        # Global approval workflows
+        options << ["#{wf.name} #{l(:note_global)}", wf.id]
+      end
+    end
+    options_for_select options, selected: dmsf_workflow_id
+  end
+
+  def principals_radio_button_tags(name, principals)
+    s = []
+    principals.each do |principal|
+      n = principal.id * 10
+      id = "principal_#{n}"
+      s << radio_button_tag(name, n, false, onclick: 'noteMandatory(true);', id: id)
+      s << content_tag(:label, h(principal), for: id)
+      s << tag.br
+    end
+    safe_join s
+  end
+end

app/models/dmsf_file.rb

@@ -0,0 +1,684 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Vít Jonáš <vit.jonas@gmail.com>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+require "#{File.dirname(__FILE__)}/../../lib/redmine_dmsf/lockable"
+require "#{File.dirname(__FILE__)}/../../lib/redmine_dmsf/plugin"
+require 'English'
+
+# File
+class DmsfFile < ApplicationRecord
+  include RedmineDmsf::Lockable
+
+  belongs_to :project
+  belongs_to :dmsf_folder
+  belongs_to :deleted_by_user, class_name: 'User'
+
+  has_many :dmsf_file_revisions, -> { order(created_at: :desc, id: :desc) }, dependent: :destroy, inverse_of: :dmsf_file
+  has_many :locks, -> { where(entity_type: 0).order(updated_at: :desc) },
+           class_name: 'DmsfLock', foreign_key: 'entity_id', dependent: :destroy, inverse_of: :dmsf_file
+  has_many :referenced_links, -> { where target_type: DmsfFile.model_name.to_s },
+           class_name: 'DmsfLink', foreign_key: 'target_id', dependent: :destroy, inverse_of: false
+  has_many :dmsf_public_urls, dependent: :destroy
+
+  STATUS_DELETED = 1
+  STATUS_ACTIVE = 0
+
+  scope :visible, -> { where(deleted: STATUS_ACTIVE) }
+  scope :deleted, -> { where(deleted: STATUS_DELETED) }
+
+  validates :name, dmsf_file_name: true
+  validates :name, length: { maximum: 255 }
+  validates :name,
+            uniqueness: {
+              scope: %i[dmsf_folder_id project_id deleted],
+              conditions: -> { where(deleted: STATUS_ACTIVE) },
+              case_sensitive: true
+            }
+
+  acts_as_event(
+    title: proc { |o|
+      @searched_revision = nil
+      o.dmsf_file_revisions.visible.each do |r|
+        key = "DmsfFile-#{o.id}-#{r.id}"
+        @desc = Redmine::Search.cache_store.fetch(key)
+        next unless @desc
+
+        Redmine::Search.cache_store.delete key
+        @searched_revision = r
+        break
+      end
+      if @searched_revision && (@searched_revision != o.last_revision)
+        "#{o.name} (r#{@searched_revision.id})"
+      else
+        o.name
+      end
+    },
+    description: proc { |o|
+      unless @desc
+        # Set desc to an empty string if o.description is nil
+        @desc = o.description.nil? ? +'' : +o.description
+        @desc += ' / ' if o.description.present? && o.last_revision.comment.present?
+        @desc += o.last_revision.comment if o.last_revision.comment.present?
+      end
+      @desc
+    },
+    url: proc { |o|
+      if @searched_revision
+        { controller: 'dmsf_files', action: 'view', id: o.id, download: @searched_revision.id,
+          filename: o.name }
+      else
+        { controller: 'dmsf_files', action: 'view', id: o.id, filename: o.name }
+      end
+    },
+    datetime: proc { |o|
+      if @searched_revision
+        @searched_revision.updated_at
+      else
+        o.updated_at
+      end
+    },
+    author: proc { |o|
+      if @searched_revision
+        @searched_revision.user
+      else
+        o.last_revision.user
+      end
+    }
+  )
+  acts_as_watchable
+  acts_as_searchable(
+    columns: [
+      "#{table_name}.name",
+      "#{DmsfFileRevision.table_name}.title",
+      "#{DmsfFileRevision.table_name}.description",
+      "#{DmsfFileRevision.table_name}.comment"
+    ],
+    project_key: 'project_id',
+    date_column: "#{table_name}.updated_at"
+  )
+
+  before_create :default_values
+  before_destroy :delete_system_folder_before
+  after_destroy :delete_system_folder_after
+
+  attr_writer :last_revision
+
+  def self.previews_storage_path
+    Rails.root.join 'tmp/dmsf_previews'
+  end
+
+  def default_values
+    return unless RedmineDmsf.dmsf_default_notifications? && (!dmsf_folder || !dmsf_folder.system)
+
+    self.notification = true
+  end
+
+  def initialize(*args)
+    super
+    self.watcher_user_ids = [] if new_record?
+  end
+
+  def self.storage_path
+    path = RedmineDmsf.dmsf_storage_directory
+    pn = Pathname.new(path)
+    return pn if pn.absolute?
+
+    Rails.root.join path
+  end
+
+  def self.find_file_by_name(project, folder, name)
+    findn_file_by_name project&.id, folder, name
+  end
+
+  def self.findn_file_by_name(project_id, folder, name)
+    visible.find_by project_id: project_id, dmsf_folder_id: folder&.id, name: name
+  end
+
+  def approval_allowed_zero_minor
+    RedmineDmsf.only_approval_zero_minor_version? ? last_revision.minor_version&.zero? : true
+  end
+
+  def last_revision
+    unless defined?(@last_revision)
+      @last_revision = deleted? ? dmsf_file_revisions.first : dmsf_file_revisions.visible.first
+    end
+    @last_revision
+  end
+
+  def deleted?
+    deleted == STATUS_DELETED
+  end
+
+  def locked_by
+    if lock && lock.reverse[0]
+      user = lock.reverse[0].user
+      return user == User.current ? l(:label_me) : user.name if user
+    end
+    ''
+  end
+
+  def delete(commit: false)
+    if locked_for_user? && !User.current.allowed_to?(:force_file_unlock, project)
+      Rails.logger.info l(:error_file_is_locked)
+      if lock.reverse[0].user
+        errors.add(:base, l(:title_locked_by_user, user: lock.reverse[0].user))
+      else
+        errors.add(:base, l(:error_file_is_locked))
+      end
+      return false
+    end
+    begin
+      # Revisions and links of a deleted file SHOULD be deleted too
+      dmsf_file_revisions.each { |r| r.delete(commit: commit, force: true) }
+      if commit
+        destroy
+      else
+        self.deleted = STATUS_DELETED
+        self.deleted_by_user = User.current
+        save
+      end
+    rescue StandardError => e
+      Rails.logger.error e.message
+      errors.add :base, e.message
+      false
+    end
+  end
+
+  def restore
+    if dmsf_folder_id && (dmsf_folder.nil? || dmsf_folder.deleted?)
+      errors.add(:base, l(:error_parent_folder))
+      return false
+    end
+    dmsf_file_revisions.each(&:restore)
+    self.deleted = STATUS_ACTIVE
+    self.deleted_by_user = nil
+    save
+  end
+
+  def title
+    last_revision ? last_revision.title : name
+  end
+
+  def description
+    last_revision ? last_revision.description : ''
+  end
+
+  def version
+    last_revision ? last_revision.version : '0'
+  end
+
+  def workflow
+    last_revision&.workflow
+  end
+
+  def size
+    last_revision ? last_revision.size : 0
+  end
+
+  def dmsf_path
+    path = dmsf_folder ? dmsf_folder.dmsf_path : []
+    path.push self
+    path
+  end
+
+  def dmsf_path_str
+    dmsf_path.map(&:title).join('/')
+  end
+
+  def notify?
+    notification || dmsf_folder&.notify? || (!dmsf_folder && project.dmsf_notification)
+  end
+
+  def get_all_watchers(watchers)
+    watchers.concat notified_watchers
+    if dmsf_folder
+      watchers.concat dmsf_folder.notified_watchers
+    else
+      watchers.concat project.notified_watchers
+    end
+  end
+
+  def notify_deactivate
+    self.notification = nil
+    save!
+  end
+
+  def notify_activate
+    self.notification = true
+    save!
+  end
+
+  # Returns an array of projects that current user can copy file to
+  def self.allowed_target_projects_on_copy
+    projects = []
+    if User.current.admin?
+      projects = Project.visible.has_module('dmsf').all
+    elsif User.current.logged?
+      User.current.memberships.each do |m|
+        projects << m.project if m.project.module_enabled?('dmsf') &&
+                                 m.roles.detect { |r| r.allowed_to?(:file_manipulation) }
+      end
+    end
+    projects
+  end
+
+  def move_to(project, folder)
+    unless last_revision
+      errors.add :base, l(:error_at_least_one_revision_must_be_present)
+      Rails.logger.error l(:error_at_least_one_revision_must_be_present)
+      return false
+    end
+    source = "#{self.project.identifier}:#{dmsf_path_str}"
+    self.project = project
+    self.dmsf_folder = folder
+    new_revision = last_revision.clone
+    new_revision.user_id = last_revision.user_id
+    new_revision.workflow = nil
+    new_revision.dmsf_workflow_id = nil
+    new_revision.dmsf_workflow_assigned_by_user_id = nil
+    new_revision.dmsf_workflow_assigned_at = nil
+    new_revision.dmsf_workflow_started_by_user_id = nil
+    new_revision.dmsf_workflow_started_at = nil
+    new_revision.dmsf_file = self
+    new_revision.comment = l(:comment_moved_from, source: source)
+    new_revision.custom_values = []
+    last_revision.custom_values.each do |cv|
+      new_revision.custom_values << CustomValue.new({ custom_field: cv.custom_field, value: cv.value })
+    end
+    self.last_revision = new_revision
+    save && new_revision.save
+  end
+
+  def copy_to(project, folder = nil)
+    copy_to_filename project, folder, name
+  end
+
+  def copy_to_filename(project, folder, filename)
+    file = DmsfFile.new
+    file.dmsf_folder_id = folder.id if folder
+    file.project_id = project.id
+    if DmsfFile.exists?(project_id: file.project_id, dmsf_folder_id: file.dmsf_folder_id, name: filename)
+      1.step do |i|
+        gen_filename = " #{filename} #{l(:dmsf_copy, n: i)}"
+        unless DmsfFile.exists?(project_id: file.project_id, dmsf_folder_id: file.dmsf_folder_id, name: gen_filename)
+          filename = gen_filename
+          break
+        end
+      end
+    end
+    file.name = filename
+    file.notification = RedmineDmsf.dmsf_default_notifications?
+    if file.save && last_revision
+      new_revision = last_revision.clone
+      new_revision.dmsf_file = file
+      new_revision.disk_filename = new_revision.new_storage_filename
+      # Assign the same workflow if it's a global one or we are in the same project
+      new_revision.workflow = nil
+      new_revision.dmsf_workflow_id = nil
+      new_revision.dmsf_workflow_assigned_by_user_id = nil
+      new_revision.dmsf_workflow_assigned_at = nil
+      new_revision.dmsf_workflow_started_by_user_id = nil
+      new_revision.dmsf_workflow_started_at = nil
+      wf = last_revision.dmsf_workflow
+      if wf && (wf.project.nil? || (wf.project.id == project.id))
+        new_revision.set_workflow wf.id, nil
+        new_revision.assign_workflow wf.id
+      end
+      if File.exist? last_revision.disk_file
+        FileUtils.cp last_revision.disk_file, new_revision.disk_file(search_if_not_exists: false)
+      end
+      new_revision.comment = l(:comment_copied_from, source: "#{self.project.identifier}:#{dmsf_path_str}")
+      new_revision.custom_values = []
+      last_revision.custom_values.each do |cv|
+        v = CustomValue.new
+        v.custom_field = cv.custom_field
+        v.value = cv.value
+        new_revision.custom_values << v
+      end
+      if new_revision.save
+        file.last_revision = new_revision
+      else
+        errors.add :base, new_revision.errors.full_messages.to_sentence
+        Rails.logger.error new_revision.errors.full_messages.to_sentence
+        file.delete commit: true
+        file = nil
+      end
+    else
+      Rails.logger.error file.errors.full_messages.to_sentence
+      file.delete commit: true
+      file = nil
+    end
+    file
+  end
+
+  # To fulfill searchable module expectations
+  def self.search(tokens, projects = nil, options = {}, user = User.current)
+    tokens = [] << tokens unless tokens.is_a?(Array)
+    projects = [] << projects if projects.is_a?(Project)
+    project_ids = projects.collect(&:id) if projects
+    limit_options = ["dmsf_files.updated_at #{options[:before] ? '<' : '>'} ?", options[:offset]] if options[:offset]
+    columns = if options[:titles_only]
+                [searchable_options[:columns][1]]
+              else
+                searchable_options[:columns]
+              end
+
+    token_clauses = columns.collect { |column| "(LOWER(#{column}) LIKE ?)" }
+
+    sql = (["(#{token_clauses.join(' OR ')})"] * tokens.size).join(options[:all_words] ? ' AND ' : ' OR ')
+    find_options = [sql, * (tokens.collect { |w| "%#{w.downcase}%" } * token_clauses.size).sort]
+
+    project_conditions = []
+    project_conditions << Project.allowed_to_condition(user, :view_dmsf_files)
+    project_conditions << "#{Project.table_name}.id IN (#{project_ids.join(',')})" if project_ids.present?
+
+    scope = visible
+            .joins('JOIN dmsf_file_revisions ON dmsf_file_revisions.dmsf_file_id = dmsf_files.id')
+            .joins(:project)
+    scope = scope.limit(options[:limit]) if options[:limit].present?
+    scope = scope.where(limit_options) if limit_options.present?
+    scope = scope.where(project_conditions.join(' AND '))
+    results = scope.where(find_options).uniq.to_a
+    results.delete_if { |x| !DmsfFolder.permissions?(x.dmsf_folder) }
+
+    if !options[:titles_only] && RedmineDmsf::Plugin.lib_available?('xapian')
+      database = nil
+      begin
+        lang = RedmineDmsf.dmsf_stemming_lang
+        databasepath = File.join(RedmineDmsf.dmsf_index_database, lang)
+        database = Xapian::Database.new(databasepath)
+      rescue StandardError => e
+        Rails.logger.error "REDMINE_XAPIAN ERROR: Xapian database is not properly set, initiated or it's corrupted."
+        Rails.logger.error e.message
+      end
+
+      if database
+        enquire = Xapian::Enquire.new(database)
+
+        # Combine the rest of the command line arguments with spaces between
+        # them, so that simple queries don't have to be quoted at the shell
+        # level.
+        query_string = tokens.map { |x| x[-1, 1].eql?('*') ? x : "#{x}*" }.join(' ')
+        qp = Xapian::QueryParser.new
+        stemmer = Xapian::Stem.new(lang)
+        qp.stemmer = stemmer
+        qp.database = database
+
+        case RedmineDmsf.dmsf_stemming_strategy
+        when 'STEM_NONE'
+          qp.stemming_strategy = Xapian::QueryParser::STEM_NONE
+        when 'STEM_SOME'
+          qp.stemming_strategy = Xapian::QueryParser::STEM_SOME
+        when 'STEM_ALL'
+          qp.stemming_strategy = Xapian::QueryParser::STEM_ALL
+        end
+
+        qp.default_op = if options[:all_words]
+                          Xapian::Query::OP_AND
+                        else
+                          Xapian::Query::OP_OR
+                        end
+
+        flags = Xapian::QueryParser::FLAG_WILDCARD
+        flags |= Xapian::QueryParser::FLAG_CJK_NGRAM if RedmineDmsf.dmsf_enable_cjk_ngrams?
+
+        query = qp.parse_query(query_string, flags)
+
+        enquire.query = query
+        matchset = enquire.mset(0, 1000)
+
+        matchset&.matches&.each do |m|
+          docdata = m.document.data { url }
+          dochash = Hash[*docdata.scan(%r{(url|sample|modtime|author|type|size)=/?([^\n\]]+)}).flatten]
+          filename = dochash['url']
+          next unless filename
+
+          dmsf_attrs = filename.scan(%r{^\d{4}/\d{2}/(\d{12}_(\d+)_.*)$})
+          id_attribute = 0
+          id_attribute = dmsf_attrs[0][1] if dmsf_attrs.length.positive?
+          next if dmsf_attrs.empty? || id_attribute.to_i.zero?
+
+          dmsf_file = DmsfFile.visible.where(limit_options).find_by(id: id_attribute)
+          next unless dmsf_file && DmsfFolder.permissions?(dmsf_file.dmsf_folder) &&
+                      user.allowed_to?(:view_dmsf_files, dmsf_file.project) &&
+                      (project_ids.blank? || project_ids.include?(dmsf_file.project_id))
+
+          rev_id = DmsfFileRevision.where(dmsf_file_id: dmsf_file.id, disk_filename: dmsf_attrs[0][0])
+                                   .pick(:id)
+          if dochash['sample']
+            Redmine::Search.cache_store.write("DmsfFile-#{dmsf_file.id}-#{rev_id}",
+                                              dochash['sample'].force_encoding('UTF-8'))
+          end
+          break if options[:limit].present? && results.count >= options[:limit]
+
+          results << dmsf_file
+        end
+      end
+    end
+
+    [results, results.count]
+  end
+
+  def self.search_result_ranks_and_ids(tokens, user = User.current, projects = nil, options = {})
+    r = search(tokens, projects, options, user)[0]
+    r.map { |f| [f.updated_at.to_i, f.id] }
+  end
+
+  def display_name
+    member = Member.find_by(user_id: User.current.id, project_id: project_id)
+    fname = formatted_name(member)
+    return "#{fname[0, 25]}...#{fname[-25, 25]}" if fname.length > 50
+
+    fname
+  end
+
+  def text?
+    filename = last_revision&.disk_filename
+    Redmine::MimeType.is_type?('text', filename) ||
+      Redmine::SyntaxHighlighting.filename_supported?(filename)
+  end
+
+  def image?
+    Redmine::MimeType.is_type?('image', last_revision&.disk_filename)
+  end
+
+  def pdf?
+    Redmine::MimeType.of(last_revision&.disk_filename) == 'application/pdf'
+  end
+
+  def video?
+    Redmine::MimeType.is_type?('video', last_revision&.disk_filename)
+  end
+
+  def html?
+    Redmine::MimeType.of(last_revision&.disk_filename) == 'text/html'
+  end
+
+  def office_doc?
+    case File.extname(last_revision&.disk_filename)
+    when  '.odt', '.ods', '.odp', '.odg', # LibreOffice
+          '.doc', '.docx', '.docm', '.xls', '.xlsx', '.xlsm', '.ppt', '.pptx', '.pptm', # MS Office
+          '.rtf' # Universal
+      true
+    else
+      false
+    end
+  end
+
+  def markdown?
+    Redmine::MimeType.of(last_revision&.disk_filename) == 'text/markdown'
+  end
+
+  def textile?
+    Redmine::MimeType.of(last_revision&.disk_filename) == 'text/x-textile'
+  end
+
+  def disposition
+    image? || pdf? || video? || html? ? 'inline' : 'attachment'
+  end
+
+  def thumbnailable?
+    Redmine::Thumbnail.convert_available? && (image? || (pdf? && Redmine::Thumbnail.gs_available?))
+  end
+
+  def previewable?
+    office_doc? && RedmineDmsf::Preview.office_available? && size <= Setting.file_max_size_displayed.to_i.kilobyte
+  end
+
+  # Deletes all previews
+  def self.clear_previews
+    Dir.glob(File.join(DmsfFile.previews_storage_path, '*.pdf')).each do |file|
+      File.delete file
+    end
+  end
+
+  def pdf_preview
+    return '' unless previewable?
+
+    target = File.join(DmsfFile.previews_storage_path, "#{File.basename(last_revision&.disk_file.to_s, '.*')}.pdf")
+    begin
+      RedmineDmsf::Preview.generate last_revision&.disk_file.to_s, target
+    rescue StandardError => e
+      Rails.logger.error do
+        %(An error occurred while generating preview for #{last_revision&.disk_file} to #{target}\n
+          Exception was: #{e.message})
+      end
+      ''
+    end
+  end
+
+  def text_preview(limit)
+    result = +'No preview available'
+    if text?
+      begin
+        f = File.new(last_revision.disk_file)
+        f.each_line do |line|
+          case f.lineno
+          when 1
+            result = line
+          when limit.to_i + 1
+            break
+          else
+            result << line
+          end
+        end
+      rescue StandardError => e
+        result = e.message
+      end
+    end
+    result
+  end
+
+  def formatted_name(member)
+    if last_revision
+      last_revision.formatted_name(member)
+    else
+      name
+    end
+  end
+
+  def owner?(user)
+    last_revision&.user == user
+  end
+
+  def involved?(user)
+    dmsf_file_revisions.each do |file_revision|
+      return true if file_revision.user == user
+    end
+    false
+  end
+
+  def assigned?(user)
+    return false unless last_revision&.dmsf_workflow
+
+    last_revision.dmsf_workflow.next_assignments(last_revision.id).each do |assignment|
+      return true if assignment.user == user
+    end
+    false
+  end
+
+  def custom_value(custom_field)
+    return nill unless last_revision
+
+    last_revision.custom_field_values.each do |cv|
+      return cv if cv.custom_field == custom_field
+    end
+    nil
+  end
+
+  def extension
+    File.extname(last_revision.disk_filename).strip.downcase[1..] if last_revision
+  end
+
+  def thumbnail(options = {})
+    size = options[:size].to_i
+    if size.positive?
+      # Limit the number of thumbnails per image
+      size = (size / 50) * 50
+      # Maximum thumbnail size
+      size = 800 if size > 800
+    else
+      size = Setting.thumbnails_size.to_i
+    end
+    size = 100 unless size.positive?
+    target = File.join(Attachment.thumbnails_storage_path, "#{id}_#{last_revision.digest}_#{size}.thumb")
+    begin
+      Redmine::Thumbnail.generate last_revision.disk_file.to_s, target, size, pdf?
+    rescue StandardError => e
+      Rails.logger.error do
+        %(An error occured while generating thumbnail for #{last_revision.disk_file} to #{target}\n
+          Exception was: #{e.message})
+      end
+      nil
+    end
+  end
+
+  def locked_title
+    if locked_for_user?
+      return l(:title_locked_by_user, user: lock.reverse[0].user) if lock.reverse[0].user
+
+      return "#{l(:label_user)} #{l('activerecord.errors.messages.invalid')}"
+    end
+    l(:title_unlock_file)
+  end
+
+  def container
+    return unless dmsf_folder&.system && dmsf_folder.title&.match(/(^\d+)/)
+
+    id = Regexp.last_match(1).to_i
+    case dmsf_folder.dmsf_folder&.title
+    when '.Issues'
+      Issue.visible.find_by id: id
+    end
+  end
+
+  def to_s
+    name
+  end
+
+  def delete_system_folder_before
+    @parent_folder = dmsf_folder
+  end
+
+  def delete_system_folder_after
+    return unless @parent_folder&.system && @parent_folder.dmsf_files.empty? && @parent_folder.dmsf_links.empty?
+
+    @parent_folder&.destroy
+  end
+end

app/models/dmsf_file_revision.rb

@@ -0,0 +1,466 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Vít Jonáš <vit.jonas@gmail.com>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# File revision
+class DmsfFileRevision < ApplicationRecord
+  belongs_to :dmsf_file, inverse_of: :dmsf_file_revisions
+  belongs_to :source_revision,
+             class_name: 'DmsfFileRevision',
+             foreign_key: 'source_dmsf_file_revision_id',
+             inverse_of: false
+  belongs_to :user
+  belongs_to :deleted_by_user, class_name: 'User'
+  belongs_to :dmsf_workflow_started_by_user, class_name: 'User'
+  belongs_to :dmsf_workflow_assigned_by_user, class_name: 'User'
+  belongs_to :dmsf_workflow
+
+  has_many :dmsf_file_revision_access, dependent: :destroy
+  has_many :dmsf_workflow_step_assignment, dependent: :destroy
+
+  before_destroy :delete_source_revision
+
+  STATUS_DELETED = 1
+  STATUS_ACTIVE = 0
+
+  PATCH_VERSION = 1
+  MINOR_VERSION = 2
+  MAJOR_VERSION = 3
+
+  PROTOCOLS = {
+    'application/msword' => 'ms-word',
+    'application/excel' => 'ms-excel',
+    'application/vnd.ms-excel' => 'ms-excel',
+    'application/vnd.ms-powerpoint' => 'ms-powerpoint',
+    'application/vnd.openxmlformats-officedocument.wordprocessingml.document' => 'ms-word',
+    'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' => 'ms-excel',
+    'application/vnd.openxmlformats-officedocument.presentationml.presentation' => 'ms-powerpoint',
+    'application/vnd.openxmlformats-officedocument.presentationml.slideshow' => 'ms-powerpoint',
+    'application/vnd.oasis.opendocument.spreadsheet' => 'ms-excel',
+    'application/vnd.oasis.opendocument.text' => 'ms-word',
+    'application/vnd.oasis.opendocument.presentation' => 'ms-powerpoint',
+    'application/vnd.ms-excel.sheet.macroenabled.12' => 'ms-excel'
+  }.freeze
+
+  scope :visible, -> { where(deleted: STATUS_ACTIVE) }
+  scope :deleted, -> { where(deleted: STATUS_DELETED) }
+
+  acts_as_customizable
+  acts_as_event(
+    title: proc { |o|
+      if o.source_dmsf_file_revision_id.present?
+        "#{l(:label_dmsf_updated)}: #{o.dmsf_file.dmsf_path_str}"
+      else
+        "#{l(:label_created)}: #{o.dmsf_file.dmsf_path_str}"
+      end
+    },
+    url: proc { |o| { controller: 'dmsf_files', action: 'show', id: o.dmsf_file } },
+    datetime: proc { |o| o.updated_at },
+    description: proc { |o| "#{o.description}\n#{o.comment}" },
+    author: proc { |o| o.user }
+  )
+
+  acts_as_activity_provider(
+    type: 'dmsf_file_revisions',
+    timestamp: "#{DmsfFileRevision.table_name}.updated_at",
+    author_key: "#{DmsfFileRevision.table_name}.user_id",
+    permission: :view_dmsf_file_revisions,
+    scope: proc {
+      DmsfFileRevision
+        .joins(:dmsf_file)
+        .joins("JOIN #{Project.table_name} ON #{Project.table_name}.id = #{DmsfFile.table_name}.project_id")
+        .visible
+    }
+  )
+
+  validates :title, presence: true
+  validates :title, length: { maximum: 255 }
+  validates :major_version, presence: true
+  validates :name, dmsf_file_name: true
+  validates :name, length: { maximum: 255 }
+  validates :disk_filename, length: { maximum: 255 }
+  validates :name, dmsf_file_extension: true
+  validates :description, length: { maximum: 1.kilobyte }
+  validates :size, dmsf_max_file_size: true
+
+  def visible?(_user = nil)
+    deleted == STATUS_ACTIVE
+  end
+
+  def project
+    dmsf_file&.project
+  end
+
+  def folder
+    dmsf_file&.dmsf_folder
+  end
+
+  def self.remove_extension(filename)
+    filename[0, (filename.length - File.extname(filename).length)]
+  end
+
+  def self.filename_to_title(filename)
+    remove_extension(filename).gsub(/_+/, ' ')
+  end
+
+  def delete(commit: false, force: true)
+    if dmsf_file.locked_for_user?
+      errors.add :base, l(:error_file_is_locked)
+      return false
+    end
+    if !commit && !force && (dmsf_file.dmsf_file_revisions.length <= 1)
+      errors.add :base, l(:error_at_least_one_revision_must_be_present)
+      return false
+    end
+
+    if commit
+      destroy
+    else
+      self.deleted = DmsfFile::STATUS_DELETED
+      self.deleted_by_user = User.current
+      save
+    end
+  end
+
+  def obsolete
+    if dmsf_file.locked_for_user?
+      errors.add :base, l(:error_file_is_locked)
+      return false
+    end
+    self.workflow = DmsfWorkflow::STATE_OBSOLETE
+    save
+  end
+
+  def restore
+    self.deleted = DmsfFile::STATUS_ACTIVE
+    self.deleted_by_user = nil
+    save
+  end
+
+  def version
+    DmsfFileRevision.version major_version, minor_version, patch_version
+  end
+
+  def self.version(major_version, minor_version, patch_version)
+    return unless major_version
+
+    ver = DmsfUploadHelper.gui_version(major_version).to_s
+    if minor_version
+      ver << ".#{DmsfUploadHelper.gui_version(minor_version)}" if -minor_version != ' '.ord
+      ver << ".#{DmsfUploadHelper.gui_version(patch_version)}" if patch_version.present? && (-patch_version != ' '.ord)
+    end
+    ver
+  end
+
+  def storage_base_path
+    time = created_at || DateTime.current
+    DmsfFile.storage_path.join(time.strftime('%Y')).join time.strftime('%m')
+  end
+
+  def disk_file(search_if_not_exists: true)
+    path = storage_base_path
+    begin
+      FileUtils.mkdir_p(path)
+    rescue StandardError => e
+      Rails.logger.error e.message
+    end
+    filename = path.join(disk_filename)
+    if search_if_not_exists && !File.exist?(filename)
+      # Let's search for the physical file in source revisions
+      dmsf_file.dmsf_file_revisions.where(created_at: ...created_at).order(created_at: :desc).each do |rev|
+        filename = rev.disk_file
+        break if File.exist?(filename)
+      end
+    end
+    filename.to_s
+  end
+
+  def new_storage_filename
+    raise DmsfAccessError, 'File id is not set' unless dmsf_file&.id
+
+    filename = DmsfHelper.sanitize_filename(name)
+    timestamp = DateTime.current.strftime('%y%m%d%H%M%S')
+    timestamp.succ! while File.exist? storage_base_path.join("#{timestamp}_#{dmsf_file.id}_#{filename}")
+    "#{timestamp}_#{dmsf_file.id}_#{filename}"
+  end
+
+  def detect_content_type
+    content_type = mime_type
+    content_type = Redmine::MimeType.of(disk_filename) if content_type.blank?
+    content_type = 'application/octet-stream' if content_type.blank?
+    content_type
+  end
+
+  def clone
+    new_revision = DmsfFileRevision.new
+    new_revision.dmsf_file = dmsf_file
+    new_revision.disk_filename = disk_filename
+    new_revision.size = size
+    new_revision.mime_type = mime_type
+    new_revision.title = title
+    new_revision.description = description
+    new_revision.workflow = workflow
+    new_revision.major_version = major_version
+    new_revision.minor_version = minor_version
+    new_revision.patch_version = patch_version
+    new_revision.source_revision = self
+    new_revision.user = User.current
+    new_revision.name = name
+    new_revision.digest = digest
+    new_revision
+  end
+
+  def workflow_str(name)
+    str = ''
+    if name && dmsf_workflow_id
+      names = DmsfWorkflow.where(id: dmsf_workflow_id).pluck(:name)
+      str = "#{names.first} - " if names.any?
+    end
+    case workflow
+    when DmsfWorkflow::STATE_WAITING_FOR_APPROVAL
+      str + l(:title_waiting_for_approval)
+    when DmsfWorkflow::STATE_APPROVED
+      str + l(:title_approved)
+    when DmsfWorkflow::STATE_ASSIGNED
+      str + l(:title_assigned)
+    when DmsfWorkflow::STATE_REJECTED
+      str + l(:title_rejected)
+    when DmsfWorkflow::STATE_OBSOLETE
+      str + l(:title_obsolete)
+    else
+      str + l(:title_none)
+    end
+  end
+
+  def set_workflow(dmsf_workflow_id, commit)
+    self.dmsf_workflow_id = dmsf_workflow_id
+    if commit == 'start'
+      self.workflow = DmsfWorkflow::STATE_WAITING_FOR_APPROVAL
+      self.dmsf_workflow_started_by_user = User.current
+      self.dmsf_workflow_started_at = DateTime.current
+    else
+      self.workflow = DmsfWorkflow::STATE_ASSIGNED
+      self.dmsf_workflow_assigned_by_user = User.current
+      self.dmsf_workflow_assigned_at = DateTime.current
+    end
+  end
+
+  def assign_workflow(dmsf_workflow_id)
+    wf = DmsfWorkflow.find_by(id: dmsf_workflow_id)
+    wf.assign(id) if wf && id
+  end
+
+  def reset_workflow
+    self.workflow = nil
+    self.dmsf_workflow_id = nil
+    self.dmsf_workflow_assigned_by_user_id = nil
+    self.dmsf_workflow_assigned_at = nil
+    self.dmsf_workflow_started_by_user_id = nil
+    self.dmsf_workflow_started_at = nil
+  end
+
+  def increase_version(version_to_increase)
+    # Patch version
+    self.patch_version = case version_to_increase
+                         when PATCH_VERSION
+                           patch_version ||= 0
+                           DmsfUploadHelper.increase_version patch_version
+                         end
+    # Minor version
+    self.minor_version = case version_to_increase
+                         when MINOR_VERSION
+                           DmsfUploadHelper.increase_version minor_version
+                         when MAJOR_VERSION
+                           major_version.negative? ? -' '.ord : 0
+                         else
+                           minor_version
+                         end
+    # Major version
+    self.major_version = case version_to_increase
+                         when MAJOR_VERSION
+                           DmsfUploadHelper.increase_version major_version
+                         else
+                           major_version
+                         end
+  end
+
+  def copy_file_content(open_file)
+    sha = Digest::SHA256.new
+    File.open(disk_file(search_if_not_exists: false), 'wb') do |f|
+      if open_file.respond_to?(:read)
+        while (buffer = open_file.read(8192))
+          f.write buffer
+          sha.update buffer
+        end
+      else
+        f.write open_file
+        sha.update open_file
+      end
+    end
+    self.digest = sha.hexdigest
+  end
+
+  # Overrides Redmine::Acts::Customizable::InstanceMethods#available_custom_fields
+  def available_custom_fields
+    DmsfFileRevisionCustomField.all
+  end
+
+  def iversion
+    parts = version.split '.'
+    parts.size == 2 ? ((parts[0].to_i * 1_000) + parts[1].to_i) : 0
+  end
+
+  def formatted_name(member)
+    format = if member&.dmsf_title_format.present?
+               member.dmsf_title_format
+             else
+               RedmineDmsf.dmsf_global_title_format
+             end
+    return name if format.blank?
+
+    if name =~ /(.*)(\..*)$/
+      filename = Regexp.last_match(1)
+      ext = Regexp.last_match(2)
+    else
+      filename = name
+    end
+    format2 = format
+    format2 = format2.sub('%t', title)
+    format2 = format2.sub('%f', filename)
+    format2 = format2.sub('%d', updated_at.strftime('%Y%m%d%H%M%S'))
+    format2 = format2.sub('%v', version)
+    format2 = format2.sub('%i', dmsf_file.id.to_s)
+    format2 = format2.sub('%r', id.to_s)
+    format2 += ext if ext
+    format2
+  end
+
+  def create_digest
+    self.digest = Digest::SHA256.file(path).hexdigest
+  rescue StandardError => e
+    Rails.logger.error e.message
+    self.digest = 0
+  end
+
+  # Returns either MD5 or SHA256 depending on the way self.digest was computed
+  def digest_type
+    return nil if digest.blank?
+
+    digest.size < 64 ? 'MD5' : 'SHA256'
+  end
+
+  def tooltip
+    text = description.presence || +''
+    if comment.present?
+      text += ' / ' if text.present?
+      text += comment
+    end
+    text
+  end
+
+  def workflow_tooltip
+    tooltip = +''
+    if dmsf_workflow
+      case workflow
+      when DmsfWorkflow::STATE_WAITING_FOR_APPROVAL, DmsfWorkflow::STATE_ASSIGNED
+        assignments = dmsf_workflow.next_assignments(id)
+        assignments&.each_with_index do |assignment, index|
+          tooltip << ', ' if index.positive?
+          tooltip << assignment.user.name
+        end
+      when DmsfWorkflow::STATE_APPROVED, DmsfWorkflow::STATE_REJECTED
+        action = DmsfWorkflowStepAction.joins(:dmsf_workflow_step_assignment)
+                                       .where(dmsf_workflow_step_assignments: { dmsf_file_revision_id: id })
+                                       .order('dmsf_workflow_step_actions.created_at')
+                                       .last
+        tooltip << action.author.name if action
+      end
+    end
+    tooltip
+  end
+
+  def protocol
+    @protocol ||= PROTOCOLS[mime_type.downcase] if mime_type
+    @protocol
+  end
+
+  def delete_source_revision
+    DmsfFileRevision.where(source_dmsf_file_revision_id: id).find_each do |d|
+      d.source_revision = source_revision
+      d.save!
+    end
+    return unless RedmineDmsf.physical_file_delete?
+
+    dependencies = DmsfFileRevision.where(disk_filename: disk_filename).all.size
+    FileUtils.rm_f(disk_file) if dependencies <= 1
+  end
+
+  def copy_custom_field_values(values, source_revision = nil)
+    # For a new revision we need to remember attachments' ids
+    if source_revision
+      ids = []
+      source_revision.custom_field_values.each do |cv|
+        ids << cv.value if cv.custom_field.format.is_a?(Redmine::FieldFormat::AttachmentFormat)
+      end
+    end
+    # ActionParameters => Hash
+    h = DmsfFileRevision.params_to_hash(values)
+    # From a REST API call we don't get "20" => "Project" but "CustomFieldValue20" => "Project"
+    h.transform_keys! { |key| key.to_i.zero? && key.to_s.match(/(\d+)/) ? :Regexp.last_match(0) : key }
+    # Super
+    self.custom_field_values = h
+    # For a new revision we need to duplicate attachments
+    return unless source_revision
+
+    i = 0
+    custom_field_values.each do |cv|
+      next unless cv.custom_field.format.is_a?(Redmine::FieldFormat::AttachmentFormat)
+
+      if cv.value.blank? && h[cv.custom_field.id.to_s].present?
+        a = Attachment.find_by(id: ids[i])
+        copy = a.copy
+        copy.save
+        cv.value = copy.id
+      end
+      i += 1
+    end
+  end
+
+  # Converts ActionParameters to an ordinary Hash
+  def self.params_to_hash(params)
+    result = {}
+    return result if params.blank?
+
+    h = params.permit!.to_hash
+    h.each do |key, value|
+      if value.is_a?(Hash)
+        value = value.except('blank')
+        _, v = value.first
+        # We need a symbols here
+        result[key] = if v&.key?('file') && v['file'].blank?
+                        nil
+                      else
+                        v&.symbolize_keys
+                      end
+      else
+        result[key] = value
+      end
+    end
+    result
+  end
+end

app/models/dmsf_file_revision_access.rb

@@ -0,0 +1,57 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Vít Jonáš <vit.jonas@gmail.com>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# File revision access
+class DmsfFileRevisionAccess < ApplicationRecord
+  belongs_to :dmsf_file_revision
+  belongs_to :user
+
+  delegate :dmsf_file, to: :dmsf_file_revision, allow_nil: false
+  delegate :project, to: :dmsf_file, allow_nil: false
+
+  scope :access_grouped,
+        lambda {
+          select('user_id, COUNT(*) AS count, MIN(created_at) AS first_at, MAX(created_at) AS last_at').group('user_id')
+        }
+
+  DOWNLOAD_ACTION = 0
+  EMAIL_ACTION = 1
+
+  acts_as_event(
+    title: proc { |ra| "#{l(:label_dmsf_downloaded)}: #{ra.dmsf_file.dmsf_path_str}" },
+    url: proc { |ra| { controller: 'dmsf_files', action: 'show', id: ra.dmsf_file } },
+    datetime: proc { |ra| ra.updated_at },
+    description: proc { |ra| ra.dmsf_file_revision.comment },
+    author: proc { |ra| ra.user }
+  )
+
+  acts_as_activity_provider(
+    type: 'dmsf_file_revision_accesses',
+    timestamp: "#{DmsfFileRevisionAccess.table_name}.updated_at",
+    author_key: "#{DmsfFileRevisionAccess.table_name}.user_id",
+    permission: :view_dmsf_file_revision_accesses,
+    scope: proc {
+      DmsfFileRevisionAccess
+        .joins(:dmsf_file_revision)
+        .joins("JOIN #{DmsfFile.table_name} ON dmsf_files.id = dmsf_file_revisions.dmsf_file_id")
+        .joins("JOIN #{Project.table_name} on dmsf_files.project_id = projects.id")
+        .where(dmsf_files: { deleted: DmsfFile::STATUS_ACTIVE })
+    }
+  )
+end

app/models/dmsf_file_revision_access_query.rb

@@ -0,0 +1,80 @@
+# encode: utf-8
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# File revision access query
+class DmsfFileRevisionAccessQuery < Query
+  attr_accessor :revision_id
+
+  self.queried_class = DmsfFileRevisionAccess
+  self.view_permission = :view_dmsf_files
+
+  # Standard columns
+  self.available_columns = [
+    QueryColumn.new(:user, frozen: true),
+    QueryColumn.new(:count, frozen: true),
+    QueryColumn.new(:first_at, frozen: true),
+    QueryColumn.new(:last_at, frozen: true)
+  ]
+
+  def initialize(attributes = nil, *_args)
+    super(attributes)
+    self.sort_criteria = []
+    self.filters = {}
+  end
+
+  ######################################################################################################################
+  # Inherited
+  #
+
+  def base_scope
+    @scope ||= DmsfFileRevisionAccess.where(dmsf_file_revision_id: revision_id)
+    @scope
+  end
+
+  # Returns the issue count
+  def access_count
+    base_scope
+      .group(:user_id)
+      .count.size
+  rescue ::ActiveRecord::StatementInvalid => e
+    raise StatementInvalid, e.message
+  end
+
+  def type
+    'DmsfFileRevisionAccessQuery'
+  end
+
+  def available_columns
+    @available_columns ||= self.class.available_columns.dup
+    @available_columns
+  end
+
+  ######################################################################################################################
+  # New
+
+  def accesses(options = {})
+    base_scope
+      .access_grouped
+      .joins(:user)
+      .order(Arel.sql('COUNT(*) DESC'))
+      .limit(options[:limit])
+      .offset(options[:offset])
+  end
+end

app/models/dmsf_file_revision_custom_field.rb

@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Vít Jonáš <vit.jonas@gmail.com>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Custom field
+class DmsfFileRevisionCustomField < CustomField
+  def type_name
+    :menu_dmsf
+  end
+
+  def compare_values?(x_value, y_value)
+    if x_value.is_a?(Array) && y_value.is_a?(Array)
+      y_value.reject!(&:empty)
+      return true if y_value.empty?
+
+      x_value.reject!(&:empty?)
+      y_value.each do |b|
+        return true if x_value.include?(b)
+      end
+      false
+    else
+      x_value == y_value
+    end
+  end
+end

app/models/dmsf_folder.rb

@@ -0,0 +1,616 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Vít Jonáš <vit.jonas@gmail.com>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+require "#{File.dirname(__FILE__)}/../../lib/redmine_dmsf/lockable"
+
+# Folder
+class DmsfFolder < ApplicationRecord
+  include RedmineDmsf::Lockable
+
+  belongs_to :project
+  belongs_to :dmsf_folder
+  belongs_to :deleted_by_user, class_name: 'User'
+  belongs_to :user
+
+  has_many :dmsf_folders, -> { order :title }, dependent: :destroy, inverse_of: :dmsf_folder
+  has_many :dmsf_files, dependent: :destroy
+  has_many :folder_links, -> { where(target_type: 'DmsfFolder').order(:name) },
+           class_name: 'DmsfLink', foreign_key: 'dmsf_folder_id', dependent: :destroy, inverse_of: :dmsf_folder
+  has_many :file_links, -> { where(target_type: 'DmsfFile') },
+           class_name: 'DmsfLink', foreign_key: 'dmsf_folder_id', dependent: :destroy, inverse_of: :dmsf_folder
+  has_many :url_links, -> { where(target_type: 'DmsfUrl') },
+           class_name: 'DmsfLink', foreign_key: 'dmsf_folder_id', dependent: :destroy, inverse_of: :dmsf_folder
+  has_many :dmsf_links, dependent: :destroy
+  has_many :referenced_links, -> { where(target_type: 'DmsfFolder') },
+           class_name: 'DmsfLink', foreign_key: 'target_id', dependent: :destroy, inverse_of: :dmsf_folder
+  has_many :locks, -> { where(entity_type: 1).order(updated_at: :desc) },
+           class_name: 'DmsfLock', foreign_key: 'entity_id', dependent: :destroy, inverse_of: :dmsf_folder
+  has_many :dmsf_folder_permissions, dependent: :destroy
+
+  INVALID_CHARACTERS = '\[\]\/\\\?":<>#%\*'
+  STATUS_DELETED = 1
+  STATUS_ACTIVE = 0
+  AVAILABLE_COLUMNS = %w[id title size modified version workflow author description comment].freeze
+  DEFAULT_COLUMNS = %w[title size modified version workflow author].freeze
+
+  def self.visible_condition(system: true)
+    Project.allowed_to_condition(User.current, :view_dmsf_folders) do |role, user|
+      if role.member?
+        group_ids = user.group_ids.join(',')
+        group_ids = -1 if group_ids.blank?
+        allowed = system && role.allowed_to?(:display_system_folders) ? 1 : 0
+        %{
+          ((dfp.object_id IS NULL) OR
+          (dfp.object_id = #{role.id} AND dfp.object_type = 'Role') OR
+          ((dfp.object_id = #{user.id} OR dfp.object_id IN (#{group_ids})) AND dfp.object_type = 'User')) AND
+          (#{DmsfFolder.table_name}.system = #{DmsfFolder.connection.quoted_false} OR 1 = #{allowed})
+        }
+      end
+    end
+  end
+
+  scope :visible, (lambda do |*args|
+    system = args.shift || true
+    joins(:project)
+      .joins("LEFT JOIN #{DmsfFolderPermission.table_name} dfp ON #{DmsfFolder.table_name}.id = dfp.dmsf_folder_id")
+      .where(deleted: STATUS_ACTIVE).where(DmsfFolder.visible_condition(system: system)).distinct
+  end)
+  scope :deleted, lambda {
+    joins(:project)
+      .joins("LEFT JOIN #{DmsfFolderPermission.table_name} dfp ON #{DmsfFolder.table_name}.id = dfp.dmsf_folder_id")
+      .where(deleted: STATUS_DELETED).where(DmsfFolder.visible_condition).distinct
+  }
+  scope :issystem, -> { where(system: true, deleted: STATUS_ACTIVE) }
+
+  acts_as_customizable
+  acts_as_searchable columns: ["#{table_name}.title", "#{table_name}.description"],
+                     project_key: 'project_id',
+                     date_column: 'updated_at',
+                     permission: :view_dmsf_files,
+                     scope: proc { DmsfFolder.visible }
+  acts_as_watchable
+  acts_as_event title: proc { |o| o.title },
+                description: proc { |o| o.description },
+                url: proc { |o| { controller: 'dmsf', action: 'show', id: o.project, folder_id: o } },
+                datetime: proc { |o| o.updated_at },
+                author: proc { |o| o.user }
+
+  validates :title, presence: true, dmsf_file_name: true
+  validates :title, uniqueness: { scope: %i[dmsf_folder_id project_id deleted],
+                                  conditions: -> { where(deleted: STATUS_ACTIVE) }, case_sensitive: true }
+  validates :description, length: { maximum: 65_535 }
+  validates :dmsf_folder, dmsf_folder_parent: true, if: proc { |folder| !folder.new_record? }
+
+  before_create :default_values
+
+  def visible?(_user = User.current)
+    return DmsfFolder.visible.exists?(id: id) if respond_to?(:type) && /^folder/.match?(type)
+
+    true
+  end
+
+  def self.permissions?(folder, allow_system: true, file: false)
+    # Administrator?
+    return true if User.current&.admin? || folder.nil?
+
+    # Permissions to the project?
+    # If file is true we work just with the file and not viewing the folder
+    return false unless file || User.current&.allowed_to?(:view_dmsf_folders, folder.project)
+
+    # System folder?
+    if folder&.system
+      return false unless allow_system || User.current.allowed_to?(:display_system_folders, folder.project)
+
+      return false if (folder.title != '.Issues') && !folder.issue&.visible?(User.current)
+    end
+    # Permissions to the folder?
+    if folder.dmsf_folder_permissions.any?
+      role_ids = User.current.roles_for_project(folder.project).map(&:id)
+      role_permission_ids = folder.dmsf_folder_permissions.roles.map(&:object_id)
+      return true if role_ids.intersect?(role_permission_ids)
+
+      principal_ids = folder.dmsf_folder_permissions.users.map(&:object_id)
+      return true if principal_ids.include?(User.current.id)
+
+      user_group_ids = User.current.groups.map(&:id)
+      principal_ids.intersect? user_group_ids
+    else
+      DmsfFolder.permissions? folder.dmsf_folder, allow_system: allow_system, file: file
+    end
+  end
+
+  def initialize(*args)
+    super
+    self.watcher_user_ids = [] if new_record?
+  end
+
+  def default_values
+    self.notification = true if RedmineDmsf.dmsf_default_notifications? && !system
+  end
+
+  def locked_by
+    if lock && lock.reverse[0]
+      user = lock.reverse[0].user
+      return user == User.current ? l(:label_me) : user.name if user
+    end
+    ''
+  end
+
+  def delete(commit: false)
+    if locked?
+      errors.add :base, l(:error_folder_is_locked)
+      return false
+    end
+    if commit
+      destroy
+    else
+      delete_recursively
+    end
+  end
+
+  def delete_recursively
+    self.deleted = STATUS_DELETED
+    self.deleted_by_user = User.current
+    save!
+    dmsf_files.each(&:delete)
+    dmsf_links.each(&:delete)
+    dmsf_folders.each(&:delete_recursively)
+  end
+
+  def deleted?
+    deleted == STATUS_DELETED
+  end
+
+  def restore
+    if dmsf_folder&.deleted?
+      errors.add :base, l(:error_parent_folder)
+      return false
+    end
+    restore_recursively
+  end
+
+  def restore_recursively
+    self.deleted = STATUS_ACTIVE
+    self.deleted_by_user = nil
+    save!
+    dmsf_files.each(&:restore)
+    dmsf_links.each(&:restore)
+    dmsf_folders.each(&:restore_recursively)
+  end
+
+  def dmsf_path
+    folder = self
+    path = []
+    while folder
+      path.unshift folder
+      folder = folder.dmsf_folder
+    end
+    path
+  end
+
+  def dmsf_path_str
+    path = dmsf_path
+    string_path = path.map(&:title)
+    string_path.join '/'
+  end
+
+  def notify?
+    notification || dmsf_folder&.notify? || (!dmsf_folder && project.dmsf_notification)
+  end
+
+  def get_all_watchers(watchers)
+    watchers << notified_watchers
+    watchers << if dmsf_folder
+                  dmsf_folder.notified_watchers
+                else
+                  project.notified_watchers
+                end
+  end
+
+  def notify_deactivate
+    self.notification = nil
+    save!
+  end
+
+  def notify_activate
+    self.notification = true
+    save!
+  end
+
+  def self.directory_tree(project)
+    tree = [[l(:link_documents), nil]]
+    project = Project.find(project) unless project.is_a?(Project)
+    folders = project.dmsf_folders.visible.to_a
+    folders.delete_if(&:locked_for_user?)
+    folders.each do |folder|
+      tree.push ["...#{folder.title}", folder.id]
+      DmsfFolder.directory_subtree tree, folder, 2
+    end
+    tree
+  end
+
+  def folder_tree
+    tree = [[title, id]]
+    DmsfFolder.directory_subtree tree, self, 1
+    tree
+  end
+
+  def self.file_list(files)
+    options = []
+    options.push ['', nil, { label: 'none' }]
+    files.each do |f|
+      options.push [f.title, f.id]
+    end
+    options
+  end
+
+  # Returns an array of projects that current user can copy folder to
+  def self.allowed_target_projects_on_copy
+    projects = []
+    if User.current.admin?
+      projects = Project.visible.has_module('dmsf').all
+    elsif User.current.logged?
+      User.current.memberships.each do |m|
+        if m.project.module_enabled?('dmsf') &&
+           m.roles.detect { |r| r.allowed_to?(:folder_manipulation) && r.allowed_to?(:file_manipulation) }
+          projects << m.project
+        end
+      end
+    end
+    projects
+  end
+
+  def move_to(target_project, target_folder)
+    if project != target_project
+      dmsf_files.visible.find_each do |f|
+        f.move_to target_project, f.dmsf_folder
+      end
+      dmsf_folders.visible.find_each do |s|
+        s.move_to target_project, s.dmsf_folder
+      end
+      dmsf_links.visible.find_each do |l|
+        l.move_to target_project, l.dmsf_folder
+      end
+      self.project = target_project
+    end
+    self.dmsf_folder = target_folder
+    save
+  end
+
+  def copy_to(project, folder, copy_files: true)
+    new_folder = DmsfFolder.new
+    new_folder.dmsf_folder = folder
+    new_folder.project = folder ? folder.project : project
+    new_folder.title = title
+    new_folder.description = description
+    new_folder.user = User.current
+    new_folder.custom_values = []
+    new_folder.custom_field_values =
+      custom_field_values.each_with_object({}) do |v, h|
+        h[v.custom_field_id] = v.value
+      end
+    unless new_folder.save
+      Rails.logger.error new_folder.errors.full_messages.to_sentence
+      return new_folder
+    end
+    if copy_files
+      dmsf_files.visible.find_each do |f|
+        f.copy_to project, new_folder
+      end
+      dmsf_links.visible.find_each do |l|
+        l.copy_to project, new_folder
+      end
+    end
+    dmsf_folders.visible.find_each do |s|
+      s.copy_to project, new_folder, copy_files: copy_files
+    end
+    dmsf_folder_permissions.find_each do |p|
+      p.copy_to new_folder
+    end
+    new_folder
+  end
+
+  # Overrides Redmine::Acts::Customizable::InstanceMethods#available_custom_fields
+  def available_custom_fields
+    DmsfFileRevisionCustomField.all
+  end
+
+  def custom_values
+    # We need to response with DmsfFileRevision custom values if DmsfFolder just covers files in the union of the main
+    # view
+    if respond_to?(:type) && /^file/.match?(type)
+      return CustomValue.where(customized_type: 'DmsfFileRevision', customized_id: revision_id)
+    end
+
+    super
+  end
+
+  def modified
+    last_update = updated_at
+    time = DmsfFolder.where(['project_id = ? AND dmsf_folder_id = ? AND updated_at > ?', project_id, id, last_update])
+                     .maximum(:updated_at)
+    last_update = time if time
+    time = DmsfFile.where(['project_id = ? AND dmsf_folder_id = ? AND updated_at > ?', project_id, id, last_update])
+                   .maximum(:updated_at)
+    last_update = time if time
+    time = DmsfLink.where(['project_id = ? AND dmsf_folder_id = ? AND updated_at > ?', project_id, id, last_update])
+                   .maximum(:updated_at)
+    last_update = time if time
+    last_update
+  end
+
+  # Number of items in the folder
+  def items
+    dmsf_folders.visible.where(project_id: project_id).all.size +
+      dmsf_files.visible.where(project_id: project_id).all.size +
+      dmsf_links.visible.where(project_id: project_id).all.size
+  end
+
+  def self.column_on?(column)
+    RedmineDmsf.dmsf_columns.include? column
+  end
+
+  def custom_value(custom_field)
+    custom_field_values.each do |cv|
+      return cv if cv.custom_field == custom_field
+    end
+
+    nil
+  end
+
+  def self.get_column_position(column)
+    dmsf_columns = RedmineDmsf.dmsf_columns
+    pos = 0
+    # 0 - checkbox
+    # 1 - id
+    if dmsf_columns.include?('id')
+      pos += 1
+      return pos if column == 'id'
+    elsif column == 'id'
+      return nil
+    end
+
+    # 2 - title
+    if dmsf_columns.include?('title')
+      pos += 1
+      return pos if column == 'title'
+    elsif column == 'title'
+      return nil
+    end
+
+    # 3 - size
+    if dmsf_columns.include?('size')
+      pos += 1
+      return pos if column == 'size'
+    elsif column == 'size'
+      return nil
+    end
+
+    # 4 - modified
+    if dmsf_columns.include?('modified')
+      pos += 1
+      return pos if column == 'modified'
+    elsif column == 'modified'
+      return nil
+    end
+
+    # 5 - version
+    if dmsf_columns.include?('version')
+      pos += 1
+      return pos if column == 'version'
+    elsif column == 'version'
+      return nil
+    end
+
+    # 6 - workflow
+    if dmsf_columns.include?('workflow')
+      pos += 1
+      return pos if column == 'workflow'
+    elsif column == 'workflow'
+      return nil
+    end
+
+    # 7 - author
+    if dmsf_columns.include?('author')
+      pos += 1
+      return pos if column == 'author'
+    elsif column == 'author'
+      return nil
+    end
+
+    # 9 - custom fields
+    DmsfFileRevisionCustomField.visible.each do |c|
+      pos += 1 if DmsfFolder.column_on?(c.name)
+    end
+    # 8 - commands
+    pos += 1
+    return pos if column == 'commands'
+
+    # 9 - (position)
+    pos += 1
+    return pos if column == 'position'
+
+    # 10 - (size calculated)
+    pos += 1
+    return pos if column == 'size_calculated'
+
+    # 11 - (modified calculated)
+    pos += 1
+    return pos if column == 'modified_calculated'
+
+    # 12 - (version calculated)
+    pos += 1
+    return pos if column == 'version_calculated'
+
+    # 13 - (clear title)
+    pos += 1
+    return pos if column == 'clear_title'
+
+    nil
+  end
+
+  def issue
+    if @issue.nil? && system
+      issue_id = title.to_i
+      @issue = Issue.find_by(id: issue_id) if issue_id.positive?
+    end
+    @issue
+  end
+
+  def update_from_params(params)
+    # Attributes
+    self.title = params[:dmsf_folder][:title].scrub.strip
+    self.description = params[:dmsf_folder][:description].scrub.strip
+    self.dmsf_folder_id = params[:parent_id].presence || params[:dmsf_folder][:dmsf_folder_id]
+    self.system = params[:dmsf_folder][:system].present?
+    # Custom fields
+    if params[:dmsf_folder][:custom_field_values].present?
+      i = 0
+      params[:dmsf_folder][:custom_field_values].each do |param|
+        custom_field_values[i].value = param[1]
+        i += 1
+      end
+    end
+    # Permissions
+    dmsf_folder_permissions.delete_all
+    if params[:permissions]
+      params[:permissions][:role_ids]&.each do |role_id|
+        permission = DmsfFolderPermission.new
+        permission.object_id = role_id
+        permission.object_type = Role.model_name.to_s
+        dmsf_folder_permissions << permission
+      end
+      params[:permissions][:user_ids]&.each do |user_id|
+        permission = DmsfFolderPermission.new
+        permission.object_id = user_id
+        permission.object_type = User.model_name.to_s
+        dmsf_folder_permissions << permission
+      end
+    end
+    # Save
+    save
+  end
+
+  ALL_INVALID_CHARACTERS = /[#{INVALID_CHARACTERS}]/
+  def self.get_valid_title(title)
+    # 1. Invalid characters are replaced with dots.
+    # 2. Two or more dots in a row are replaced with a single dot.
+    # 3. Windows' WebClient does not like a dot at the end.
+    title.scrub.gsub(ALL_INVALID_CHARACTERS, '.').gsub(/\.{2,}/, '.').chomp('.')
+  end
+
+  def permission_for_role(role)
+    dmsf_folder_permissions.roles.exists? object_id: role.id
+  end
+
+  def permissions_users
+    Principal.active.where id: dmsf_folder_permissions.users.map(&:object_id)
+  end
+
+  def inherited_permissions_from
+    return nil unless dmsf_folder
+
+    if dmsf_folder.dmsf_folder_permissions.any?
+      dmsf_folder
+    else
+      dmsf_folder.inherited_permissions_from
+    end
+  end
+
+  def self.visible_folders(folders, project)
+    allowed = RedmineDmsf.dmsf_act_as_attachable? &&
+              (project.dmsf_act_as_attachable == Project::ATTACHABLE_DMS_AND_ATTACHMENTS) &&
+              User.current.allowed_to?(:display_system_folders, project)
+    folders.reject do |folder|
+      if folder.system
+        if allowed
+          issue_id = folder.title.to_i
+          if issue_id.positive?
+            issue = Issue.find_by(id: issue_id)
+            !issue&.visible? User.current
+          else
+            false
+          end
+        else
+          true
+        end
+      else
+        false
+      end
+    end
+  end
+
+  def css_classes(trash)
+    classes = []
+    if trash
+      if system
+        classes << 'dmsf-system'
+      else
+        classes << 'hascontextmenu'
+        classes << 'dmsf-gray' if type.match?(/link$/)
+      end
+    else
+      classes << 'dmsf-tree'
+      if %w[folder project].include?(type)
+        classes << 'dmsf-collapsed'
+        classes << 'dmsf-not-loaded'
+      else
+        classes << 'dmsf-child'
+      end
+      if system
+        classes << 'dmsf-system'
+      else
+        classes << 'hascontextmenu'
+        classes << 'dmsf-draggable' if type != 'project'
+        classes << 'dmsf-droppable' if %w[project folder].include? type
+        classes << 'dmsf-gray' if type.match?(/link$/)
+      end
+    end
+    classes.join ' '
+  end
+
+  def empty?
+    !(dmsf_folders.visible.exists? || dmsf_files.visible.exists? || dmsf_links.visible.exists?)
+  end
+
+  def to_s
+    title
+  end
+
+  # Check whether any child folder is equal to the folder
+  def any_child?(folder)
+    dmsf_folders.each do |child|
+      return true if child == folder
+
+      child.any_child? folder
+    end
+    false
+  end
+
+  class << self
+    def directory_subtree(tree, folder, level)
+      folders = folder.dmsf_folders.visible.to_a
+      folders.delete_if(&:locked_for_user?)
+      folders.each do |subfolder|
+        tree.push ["#{'...' * level}#{subfolder.title}", subfolder.id]
+        DmsfFolder.directory_subtree tree, subfolder, level + 1
+      end
+    end
+  end
+end

app/models/dmsf_folder_permission.rb

@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Folder permission
+class DmsfFolderPermission < ApplicationRecord
+  belongs_to :dmsf_folder
+
+  scope :users, -> { where(object_type: User.model_name.to_s) }
+  scope :roles, -> { where(object_type: Role.model_name.to_s) }
+
+  def copy_to(folder)
+    permission = DmsfFolderPermission.new
+    permission.dmsf_folder_id = folder.id
+    permission.object_id = object_id
+    permission.object_type = object_type
+    permission.save!
+    permission
+  end
+end

app/models/dmsf_link.rb

@@ -0,0 +1,149 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Link class
+class DmsfLink < ApplicationRecord
+  include ActiveModel::Validations
+
+  belongs_to :project
+  belongs_to :dmsf_folder
+  belongs_to :deleted_by_user, class_name: 'User'
+  belongs_to :user
+
+  validates :name, presence: true, length: { maximum: 255 }
+  # There can be project_id = -1 when attaching links to an issue. The project_id is assigned later when saving the
+  # issue.
+  validates :external_url, length: { maximum: 255 }
+  validates :external_url, dmsf_url: true
+
+  STATUS_DELETED = 1
+  STATUS_ACTIVE = 0
+
+  scope :visible, -> { where(deleted: STATUS_ACTIVE) }
+  scope :deleted, -> { where(deleted: STATUS_DELETED) }
+
+  before_destroy :delete_system_folder_before
+  after_destroy :delete_system_folder_after
+
+  def target_folder_id
+    if target_type == DmsfFolder.model_name.to_s
+      target_id
+    else
+      dmsf_folder_ids = DmsfFile.where(id: target_id).pluck(:dmsf_folder_id)
+      dmsf_folder_ids.first
+    end
+  end
+
+  def target_folder
+    @target_folder = DmsfFolder.find_by(id: target_folder_id) if @target_folder.nil? && target_folder_id
+    @target_folder
+  end
+
+  def target_file_id
+    target_id if target_type == DmsfFile.model_name.to_s
+  end
+
+  def target_file
+    @target_file = DmsfFile.find_by(id: target_file_id) if @target_file.nil? && target_file_id
+    @target_file
+  end
+
+  def target_project
+    @target_project ||= Project.find_by(id: target_project_id)
+    @target_project
+  end
+
+  def title
+    name
+  end
+
+  def self.find_link_by_file_name(project, folder, filename)
+    links = DmsfLink.where(project_id: project.id,
+                           dmsf_folder_id: folder&.id,
+                           target_type: DmsfFile.model_name.to_s).visible.all
+    links.each do |link|
+      return link if link&.target_file&.name == filename
+    end
+    nil
+  end
+
+  def path
+    path = if target_type == DmsfFile.model_name.to_s && target_file
+             target_file.dmsf_path.map { |element| element.is_a?(DmsfFile) ? element.display_name : element.title }
+                        .join('/')
+           else
+             target_folder ? target_folder.dmsf_path_str : +''
+           end
+    path.insert(0, "#{target_project.name}:") if project_id != target_project_id
+    return "#{path[0, 25]}...#{path[-25, 25]}" if path && path.length > 50
+
+    path
+  end
+
+  def move_to(target_project, target_folder)
+    self.project = target_project
+    self.dmsf_folder = target_folder
+    save
+  end
+
+  def copy_to(project, folder)
+    link = DmsfLink.new
+    link.target_project_id = target_project_id
+    link.target_id = target_id
+    link.target_type = target_type
+    link.name = name
+    link.external_url = external_url
+    link.project_id = project.id
+    link.dmsf_folder_id = folder&.id
+    link.user = User.current
+    link.save!
+    link
+  end
+
+  def delete(commit: false)
+    if commit
+      destroy
+    else
+      self.deleted = STATUS_DELETED
+      self.deleted_by_user = User.current
+      save validate: false
+    end
+  end
+
+  def restore
+    if dmsf_folder_id && (dmsf_folder.nil? || dmsf_folder.deleted?)
+      errors.add :base, l(:error_parent_folder)
+      return false
+    end
+
+    self.deleted = STATUS_ACTIVE
+    self.deleted_by_user = nil
+    save validate: false
+  end
+
+  def delete_system_folder_before
+    @parent_folder = dmsf_folder
+  end
+
+  def delete_system_folder_after
+    return unless @parent_folder&.system && @parent_folder.dmsf_files.empty? && @parent_folder.dmsf_links.empty?
+
+    @parent_folder&.destroy
+  end
+end

app/models/dmsf_lock.rb

@@ -0,0 +1,69 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Vít Jonáš <vit.jonas@gmail.com>, Daniel Munn <dan.munn@munnster.co.uk>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+require 'simple_enum'
+
+# Lock
+class DmsfLock < ApplicationRecord
+  before_create :generate_uuid
+  belongs_to :dmsf_file, foreign_key: 'entity_id', inverse_of: :locks
+  belongs_to :dmsf_folder, foreign_key: 'entity_id', inverse_of: :locks
+  belongs_to :user
+
+  # At the moment apparently we're only supporting a write lock?
+  as_enum :lock_type, %i[type_write type_other]
+  as_enum :lock_scope, %i[scope_exclusive scope_shared]
+
+  # We really loosely bind the value in the belongs_to above
+  # here we just ensure the data internal to the model is correct
+  # to ensure everything lists fine - it's the same as a join
+  # just without running the join in the first place
+  def dmsf_file
+    entity_type.zero? ? super : nil
+  end
+
+  # See the file, exact same scenario
+  def dmsf_folder
+    entity_type == 1 ? super : nil
+  end
+
+  def expired?
+    expires_at && (expires_at <= Time.current)
+  end
+
+  def generate_uuid
+    self.uuid = UUIDTools::UUID.random_create.to_s
+  end
+
+  # Let's allow our UUID to be searchable
+  def self.find(*args)
+    if args&.first.is_a?(String) && !args.first.match(/^\d*$/)
+      lock = find_by_uuid(*args)
+      raise ActiveRecord::RecordNotFound, "Couldn't find lock with uuid = #{args.first}" if lock.nil?
+
+      lock
+    else
+      super
+    end
+  end
+
+  def self.find_by_param(...)
+    find(...)
+  end
+end

app/models/dmsf_mailer.rb

@@ -0,0 +1,216 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Vít Jonáš <vit.jonas@gmail.com>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+require 'mailer'
+
+# Mailer
+class DmsfMailer < Mailer
+  layout 'mailer'
+
+  def self.deliver_files_updated(project, files)
+    hash = {}
+    files.each do |file|
+      users = get_notify_users(project, file)
+      users.each do |user|
+        (hash[user] ||= []) << file
+      end
+    end
+    hash.each do |user, docs|
+      files_updated(user, project, docs).deliver_later
+    end
+  end
+
+  def files_updated(user, project, files)
+    redmine_headers 'Project' => project.identifier if project
+    @files = files
+    @project = project
+    @author = files.first.last_revision.user if files.first.last_revision
+    @author ||= User.anonymous
+    message_id project
+    set_language_if_valid user.language
+    mail to: user, subject: "[#{@project.name} - #{l(:menu_dmsf)}] #{l(:text_email_doc_updated_subject)}"
+  end
+
+  def self.deliver_files_deleted(project, files)
+    hash = {}
+    files.each do |file|
+      users = get_notify_users(project, file)
+      users.each do |user|
+        (hash[user] ||= []) << file
+      end
+    end
+    hash.each do |user, docs|
+      files_deleted(user, project, docs).deliver_later
+    end
+  end
+
+  def files_deleted(user, project, files)
+    redmine_headers 'Project' => project.identifier if project
+    @files = files
+    @project = project
+    @author = files.first.deleted_by_user
+    @author ||= User.anonymous
+    message_id project
+    set_language_if_valid user.language
+    mail to: user, subject: "[#{@project.name} - #{l(:menu_dmsf)}] #{l(:text_email_doc_deleted_subject)}"
+  end
+
+  def self.deliver_files_downloaded(project, files, remote_ip)
+    hash = {}
+    files.each do |file|
+      users = get_notify_users(project, file)
+      users.each do |user|
+        (hash[user] ||= []) << file if user.pref.receive_download_notification == '1'
+      end
+    end
+    hash.each do |user, docs|
+      files_downloaded(user, project, docs, remote_ip).deliver_later
+    end
+  end
+
+  def files_downloaded(user, project, files, remote_ip)
+    redmine_headers 'Project' => project.identifier if project
+    @files = files
+    @project = project
+    @author = User.current
+    @remote_ip = remote_ip
+    message_id project
+    set_language_if_valid user.language
+    mail to: user, subject: "[#{@project.name} - #{l(:menu_dmsf)}] #{l(:text_email_doc_downloaded_subject)}"
+  end
+
+  def self.deliver_send_documents(project, email_params, author)
+    send_documents(User.current, project, email_params, author).deliver_now
+  end
+
+  def send_documents(_, project, email_params, author)
+    redmine_headers 'Project' => project.identifier if project
+    @body = email_params[:body]
+    @links_only = email_params[:links_only] == '1'
+    @public_urls = email_params[:public_urls] == '1'
+    @expired_at = email_params[:expired_at]
+    @folders = email_params[:folders]
+    @files = email_params[:files]
+    @author = author
+    unless @links_only
+      if File.exist?(email_params[:zipped_content])
+        zipped_content_data = File.binread(email_params[:zipped_content])
+        attachments['Documents.zip'] = { content_type: 'application/zip', content: zipped_content_data }
+      else
+        Rails.logger.error "Cannot attach #{email_params[:zipped_content]}, it doesn't exist."
+      end
+    end
+    skip_no_self_notified = false
+    begin
+      # We need to switch off no_self_notified temporarily otherwise the email won't be sent
+      if (author == User.current) && author.pref.no_self_notified
+        author.pref.no_self_notified = false
+        skip_no_self_notified = true
+      end
+      res = mail(to: email_params[:to], cc: email_params[:cc], subject: email_params[:subject],
+                 'From' => email_params[:from], 'Reply-To' => email_params[:reply_to])
+    ensure
+      author.pref.no_self_notified = true if skip_no_self_notified
+    end
+    res
+  end
+
+  def self.deliver_workflow_notification(users, workflow, revision, subject_id, text1_id, text2_id, notice = nil,
+                                         step = nil)
+    step_name = step&.name.present? ? step.name : step&.step
+    users.each do |user|
+      workflow_notification(user, workflow, revision, subject_id.to_s, text1_id.to_s, text2_id.to_s, notice,
+                            step_name).deliver_now
+    end
+  end
+
+  def workflow_notification(user, workflow, revision, subject_id, text1_id, text2_id, notice, step_name)
+    return unless user && workflow && revision
+
+    if revision.dmsf_file&.project
+      @project = revision.dmsf_file.project
+      redmine_headers 'Project' => @project.identifier
+    end
+    set_language_if_valid user.language
+    @user = user
+    message_id workflow
+    @workflow = workflow
+    @revision = revision
+    @text1 = l(text1_id, name: workflow.name, filename: revision.dmsf_file.name, notice: notice, stepname: step_name)
+    @text2 = l(text2_id)
+    @notice = notice
+    @author = revision.dmsf_workflow_assigned_by_user
+    @author ||= User.anonymous
+    skip_no_self_notified = false
+    begin
+      # We need to switch off no_self_notified temporarily otherwise the email won't be sent
+      if (@author == user) && @author.pref.no_self_notified
+        @author.pref.no_self_notified = false
+        skip_no_self_notified = true
+      end
+      mail to: user,
+           subject:
+            "[#{@project.name} - #{l(:field_label_dmsf_workflow)}] #{@workflow.name} #{l(subject_id)} #{step_name}"
+    ensure
+      @author.pref.no_self_notified = true if skip_no_self_notified
+    end
+  end
+
+  # force_notification = true => approval workflow's notifications
+  def self.get_notify_users(project, file, force_notification: false)
+    return [] unless project.active?
+
+    # Notifications
+    if (force_notification && Setting.notified_events.include?('dmsf_workflow_plural')) ||
+       (Setting.notified_events.include?('dmsf_legacy_notifications') && file&.notify?)
+      notify_members = project.members.active.select do |notify_member|
+        notify_user = notify_member.user
+        if notify_user == User.current && notify_user.pref.no_self_notified
+          false
+        elsif notify_member.dmsf_mail_notification.nil?
+          case notify_user.mail_notification
+          when 'all'
+            true
+          when 'selected'
+            notify_member.mail_notification?
+          when 'only_my_events'
+            file.involved?(notify_user) || file.assigned?(notify_user)
+          when 'only_owner'
+            file.owner? notify_user
+          when 'only_assigned'
+            file.assigned? notify_user
+          else
+            false
+          end
+        else
+          notify_member.dmsf_mail_notification
+        end
+      end
+      users = notify_members.collect(&:user)
+    else
+      users = []
+    end
+    # Watchers
+    watchers = []
+    file&.get_all_watchers(watchers)
+    users.concat watchers
+    users.delete(User.current) if User.current&.pref&.no_self_notified
+    users.uniq
+  end
+end

app/models/dmsf_public_url.rb

@@ -0,0 +1,35 @@
+# encode: utf-8
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Public URL
+class DmsfPublicUrl < ApplicationRecord
+  include ActiveModel::Validations
+
+  belongs_to :dmsf_file
+  belongs_to :user
+
+  before_save :generate_unique_token
+
+  private
+
+  def generate_unique_token
+    self.token ||= SecureRandom.hex(16)
+  end
+end

app/models/dmsf_query.rb

@@ -0,0 +1,586 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Query
+class DmsfQuery < Query
+  attr_accessor :dmsf_folder_id, :deleted, :sub_projects
+
+  self.queried_class = DmsfFolder
+  self.view_permission = :view_dmsf_files
+
+  # Standard columns
+  self.available_columns = [
+    QueryColumn.new(:id, sortable: 'id', caption: :label_column_id),
+    DmsfQueryTitleColumn.new(:title, sortable: 'title', frozen: true, caption: :label_column_title),
+    QueryColumn.new(:size, sortable: 'size', caption: :label_column_size),
+    DmsfQueryModifiedColumn.new(:modified, sortable: 'updated', caption: :label_column_modified),
+    DmsfQueryVersionColumn.new(:version,
+                               sortable: %(major_version minor_version patch_version),
+                               caption: :label_column_version),
+    QueryColumn.new(:workflow, sortable: 'workflow', caption: :label_column_workflow),
+    QueryColumn.new(:author, sortable: %(firstname lastname), caption: :label_column_author),
+    QueryColumn.new(:description, sortable: 'description', caption: :label_column_description),
+    QueryColumn.new(:comment, sortable: 'comment', caption: :label_column_comment)
+  ]
+
+  def initialize(attributes = nil, *_args)
+    super(attributes)
+    self.sort_criteria = []
+    self.filters ||= { 'title' => { operator: '~', values: [''] } }
+    self.dmsf_folder_id = nil
+    self.deleted = false
+    self.sub_projects = false
+  end
+
+  ######################################################################################################################
+  # Inherited
+  #
+
+  def available_columns
+    unless @available_columns
+      @available_columns = self.class.available_columns.dup
+      @available_columns += DmsfFileRevisionCustomField.visible.collect do |cf|
+        QueryCustomFieldColumn.new(cf)
+      end
+    end
+    @available_columns
+  end
+
+  def groupable_columns
+    # TODO: Implement grouping, then remove this method.
+    []
+  end
+
+  def default_columns_names
+    unless @default_column_names
+      @default_column_names = []
+      columns = available_columns
+      columns&.each do |column|
+        name = if column.is_a?(QueryCustomFieldColumn)
+                 column.custom_field.attributes['name']
+               else
+                 column.name.to_s
+               end
+        @default_column_names << column.name if DmsfFolder.column_on?(name)
+      end
+    end
+    @default_column_names
+  end
+
+  def default_sort_criteria
+    [%w[title ASC]]
+  end
+
+  def base_scope
+    @scope ||= [dmsf_folders_scope, dmsf_folder_links_scope, dmsf_projects_scope, dmsf_files_scope,
+                dmsf_file_links_scope, dmsf_url_links_scope].compact.inject(:union_all)
+    @scope
+  end
+
+  # Returns the count of all items
+  def dmsf_count
+    # We cannot use this due to the permissions
+    # base_scope.where(statement).count
+    dmsf_nodes.size
+  rescue ::ActiveRecord::StatementInvalid => e
+    raise StatementInvalid, e.message
+  end
+
+  def initialize_available_filters
+    add_available_filter 'author', type: :list, values: -> { author_values }
+    add_available_filter 'title', type: :text
+    add_available_filter 'updated', type: :date_past
+    add_available_filter 'locked', type: :list, values: [[l(:general_text_yes), '1'], [l(:general_text_no), '0']]
+    add_available_filter 'workflow', type: :list, values: [
+      [l(:title_waiting_for_approval), '1'],
+      [l(:title_approved), '2'],
+      [l(:title_assigned), '3'],
+      [l(:title_rejected), '4'],
+      [l(:title_obsolete), '5']
+    ]
+    add_custom_fields_filters DmsfFileRevisionCustomField.visible
+  end
+
+  def statement
+    unless @statement
+      filters_clauses = []
+      filters.each_key do |field|
+        v = values_for(field).clone
+        next if v.blank?
+
+        operator = operator_for(field)
+        case field
+        when 'author'
+          v.push(User.current.id.to_s) if v.delete('me')
+        when 'title'
+          next if (operator == '~') && v.join.empty?
+        end
+        if field =~ /cf_(\d+)$/
+          # custom field
+          available_filters # Initialize available filters #1380
+          sql_cf = +sql_for_custom_field(field, operator, v, Regexp.last_match(1))
+          # This is what we get
+          #  SELECT ct.id FROM dmsf_folders ct LEFT OUTER JOIN custom_values ON custom_values.customized_type='DmsfFolder' AND custom_values.customized_id=ct.id AND custom_values.custom_field_id=78 WHERE dmsf_folders.id = ct.id AND   (custom_values.value IN ('A')) AND (1=1))
+          # This is what we need
+          #  SELECT customized_id FROM custom_values WHERE customized_type=dmsf_folder.customized_type AND custom_values.customized_id=dmsf_folders.customized_id AND custom_field_id=78 AND custom_values.value IN ('A')))
+          sql_cf.gsub! ' AND (1=1)', ''
+          sql_cf.gsub!(
+            "SELECT ct.id FROM dmsf_folders ct LEFT OUTER JOIN custom_values ON custom_values.customized_type='DmsfFolder' AND custom_values.customized_id=ct.id AND custom_values.custom_field_id=",
+            'SELECT custom_values.customized_id FROM custom_values WHERE custom_values.customized_type=dmsf_folders.customized_type AND custom_values.customized_id=dmsf_folders.customized_id AND custom_values.custom_field_id='
+          )
+          sql_cf.gsub! 'WHERE dmsf_folders.id = ct.id AND   (', 'AND '
+          sql_cf.gsub!(/\)$/, '')
+          filters_clauses << sql_cf
+        else
+          filters_clauses << "(#{sql_for_field(field, operator, v, queried_table_name, field)})"
+        end
+      end
+      filters_clauses.compact_blank!
+      @statement = filters_clauses.any? ? filters_clauses.join(' AND ') : nil
+    end
+    @statement
+  end
+
+  def validate_query_filters
+    # Skip validation for empty title (default filter)
+    filter = filters.delete('title')
+    super
+    # Add it back
+    filters['title'] = filter if filter
+  end
+
+  def columns
+    cols = super
+    # Just move the optional column Id to the beginning as it isn't frozen
+    id_index = cols.index { |col| col.name == :id }
+    if id_index == 1
+      id_col = cols.delete_at(id_index)
+      cols.insert 0, id_col
+    end
+    cols
+  end
+
+  ######################################################################################################################
+  # New
+
+  def dmsf_nodes(options = {})
+    order_option = ['sort', group_by_sort_order, options[:order] || sort_clause&.first].flatten.compact_blank
+    if order_option.size > 1
+      DmsfFileRevisionCustomField.visible.pluck(:id).each do |id|
+        order_option[1].gsub! "cf_#{id}.value", "cf_#{id}"
+      end
+      if order_option[1] =~ /^(firstname|major_version),? (lastname|minor_version)( patch_version)? (DESC|ASC)$/
+        order_option[1] = if Regexp.last_match(3).present?
+                            "#{Regexp.last_match(1)} #{Regexp.last_match(4)}, #{Regexp.last_match(2)}
+                             #{Regexp.last_match(4)}, #{Regexp.last_match(3)} #{Regexp.last_match(4)}"
+                          else
+                            "#{Regexp.last_match(1)} #{Regexp.last_match(4)}, #{Regexp.last_match(2)}
+                             #{Regexp.last_match(4)}"
+                          end
+      end
+    end
+    items = case ActiveRecord::Base.connection.adapter_name.downcase
+            when /sqlserver/i
+              # This is just a workaround for #1352.
+              # limit and offset cause an error in case of MS SQL
+              base_scope.where(statement).order order_option
+            else
+              base_scope.where(statement).order(order_option).limit(options[:limit]).offset options[:offset]
+            end.to_a
+    fo = filters_on?
+    items.delete_if do |item|
+      case item.type
+      when 'project'
+        prj = Project.find_by(id: item.id)
+        !prj&.dmsf_available?
+      when 'folder'
+        dmsf_folder = DmsfFolder.find_by(id: item.id)
+        !DmsfFolder.permissions?(dmsf_folder, allow_system: false)
+      when 'file'
+        if fo
+          dmsf_file = DmsfFile.find_by(id: item.id)
+          if dmsf_file.dmsf_folder
+            !DmsfFolder.permissions?(dmsf_file.dmsf_folder, allow_system: false)
+          else
+            !dmsf_file.project.dmsf_available?
+          end
+        else
+          false
+        end
+      when /link$/
+        if fo
+          dmsf_link = DmsfLink.find_by(id: item.id)
+          if dmsf_link.dmsf_folder
+            !dmsf_link.dmsf_folder.visible? || !DmsfFolder.permissions?(dmsf_link.dmsf_folder, allow_system: false)
+          else
+            !dmsf_link.project&.dmsf_available?
+          end
+        else
+          false
+        end
+      end
+    end
+    items
+  end
+
+  def extra_columns
+    []
+  end
+
+  def self.default(project = nil, user = User.current)
+    # User's default
+    if user&.logged? && (query_id = user.pref.default_dmsf_query).present?
+      query = find_by(id: query_id)
+      return query if query&.visible?
+    end
+
+    # Project's default
+    project = project[:project] if project.is_a?(Hash)
+    query = project&.default_dmsf_query
+    return query if query&.visibility == VISIBILITY_PUBLIC
+
+    # Global default
+    query = find_by(id: RedmineDmsf.dmsf_default_query)
+    return query if query&.visibility == VISIBILITY_PUBLIC
+
+    nil
+  end
+
+  private
+
+  def filters_on?
+    filters.each_key do |field|
+      return true if values_for(field).any?(&:present?)
+    end
+    false
+  end
+
+  def sub_query
+    case ActiveRecord::Base.connection.adapter_name.downcase
+    when /sqlserver/i
+      'dmsf_file_revisions.id = (SELECT TOP 1 r.id FROM dmsf_file_revisions r
+       WHERE r.created_at = (SELECT MAX(created_at) FROM dmsf_file_revisions rr WHERE rr.dmsf_file_id = dmsf_files.id)
+       AND r.dmsf_file_id = dmsf_files.id ORDER BY id DESC)'
+    else
+      'dmsf_file_revisions.id = (SELECT r.id FROM dmsf_file_revisions r WHERE r.created_at = (SELECT MAX(created_at)
+       FROM dmsf_file_revisions rr WHERE rr.dmsf_file_id = dmsf_files.id) AND r.dmsf_file_id = dmsf_files.id ORDER BY id
+       DESC LIMIT 1)'
+    end
+  end
+
+  def integer_type
+    if Redmine::Database.mysql?
+      ActiveRecord::Base.connection.type_to_sql(:signed)
+    else
+      ActiveRecord::Base.connection.type_to_sql(:integer)
+    end
+  end
+
+  def now
+    case ActiveRecord::Base.connection.adapter_name.downcase
+    when /sqlserver/i
+      'GETDATE()'
+    when /sqlite/i
+      "datetime('now')"
+    else
+      'NOW()'
+    end
+  end
+
+  def get_cf_query(id, type, table)
+    aggr_func = Redmine::Database.mysql? || Redmine::Database.sqlite? ? 'GROUP_CONCAT(value)' : "STRING_AGG(value, ',')"
+    ",(SELECT #{aggr_func} FROM custom_values WHERE custom_field_id = #{id} AND customized_type = '#{type}' AND
+     customized_id = #{table}.id GROUP BY custom_field_id) AS cf_#{id}"
+  end
+
+  def dmsf_projects_scope
+    return nil unless sub_projects
+
+    cf_columns = +''
+    DmsfFileRevisionCustomField.visible.order(:position).pluck(:id).each do |id|
+      cf_columns << ",NULL AS cf_#{id}"
+    end
+    scope = Project.select(%{
+        projects.id AS id,
+        projects.id AS project_id,
+        CAST(NULL AS #{integer_type}) AS revision_id,
+        projects.name AS title,
+        projects.identifier AS filename,
+        CAST(NULL AS #{integer_type}) AS size,
+        projects.updated_on AS updated,
+        CAST(NULL AS #{integer_type}) AS major_version,
+        CAST(NULL AS #{integer_type}) AS minor_version,
+        CAST(NULL AS #{integer_type}) AS patch_version,
+        CAST(NULL AS #{integer_type}) AS workflow,
+        CAST(NULL AS #{integer_type}) AS workflow_id,
+        '' AS firstname,
+        '' AS lastname,
+        CAST(NULL AS #{integer_type}) AS author,
+        'project' AS type,
+        CAST(0 AS #{integer_type}) AS deleted,
+        '' AS customized_type,
+        0 AS customized_id,
+        projects.description AS description,
+        '' AS comment,
+        0 AS locked,
+        0 AS "system",
+        0 AS sort#{cf_columns}}).visible
+    if dmsf_folder_id || deleted
+      scope.none
+    else
+      scope = scope.non_templates if scope.respond_to?(:non_templates)
+      if project.nil? && filters_on?
+        scope
+      else
+        scope.where projects: { parent_id: project&.id }
+      end
+    end
+  end
+
+  def dmsf_folders_scope
+    cf_columns = +''
+    DmsfFileRevisionCustomField.visible.order(:position).pluck(:id).each do |id|
+      cf_columns << get_cf_query(id, 'DmsfFolder', 'dmsf_folders')
+    end
+    scope = DmsfFolder.select(%{
+        dmsf_folders.id AS id,
+        dmsf_folders.project_id AS project_id,
+        CAST(NULL AS #{integer_type}) AS revision_id,
+        dmsf_folders.title AS title,
+        NULL AS filename,
+        CAST(NULL AS #{integer_type}) AS size,
+        dmsf_folders.updated_at AS updated,
+        CAST(NULL AS #{integer_type}) AS major_version,
+        CAST(NULL AS #{integer_type}) AS minor_version,
+        CAST(NULL AS #{integer_type}) AS patch_version,
+        CAST(NULL AS #{integer_type}) AS workflow,
+        CAST(NULL AS #{integer_type}) AS workflow_id,
+        users.firstname AS firstname,
+        users.lastname AS lastname,
+        users.id AS author,
+        'folder' AS type,
+        dmsf_folders.deleted AS deleted,
+        'DmsfFolder' AS customized_type,
+        dmsf_folders.id AS customized_id,
+        dmsf_folders.description AS description,
+        '' AS comment,
+        (CASE WHEN dmsf_locks.id IS NULL THEN 0 ELSE 1 END) AS locked,
+        (CASE WHEN (dmsf_folders.system = #{ActiveRecord::Base.connection.quoted_true}) THEN 1 ELSE 0 END) AS "system",
+        1 AS sort#{cf_columns}})
+                      .joins('LEFT JOIN users ON dmsf_folders.user_id = users.id')
+                      .joins("LEFT JOIN dmsf_locks ON dmsf_folders.id = dmsf_locks.entity_id AND
+                              dmsf_locks.entity_type = 1 AND (dmsf_locks.expires_at IS NULL
+                              OR dmsf_locks.expires_at > #{now})")
+    scope = deleted ? scope.deleted : scope.visible
+    if dmsf_folder_id
+      scope.where dmsf_folders: { dmsf_folder_id: dmsf_folder_id }
+    elsif project.nil? && filters_on?
+      scope
+    elsif statement.present? || deleted
+      scope.where dmsf_folders: { project_id: project&.id }
+    else
+      scope.where dmsf_folders: { project_id: project&.id, dmsf_folder_id: nil }
+    end
+  end
+
+  def dmsf_folder_links_scope
+    cf_columns = +''
+    DmsfFileRevisionCustomField.visible.order(:position).pluck(:id).each do |id|
+      cf_columns << get_cf_query(id, 'DmsfFolder', 'dmsf_folders')
+    end
+    scope = DmsfLink.select(%{
+        dmsf_links.id AS id,
+        dmsf_links.target_project_id AS project_id,
+        dmsf_links.target_id AS revision_id,
+        dmsf_links.name AS title,
+        dmsf_folders.title AS filename,
+        CAST(NULL AS #{integer_type}) AS size,
+        COALESCE(dmsf_folders.updated_at, dmsf_links.updated_at) AS updated,
+        CAST(NULL AS #{integer_type}) AS major_version,
+        CAST(NULL AS #{integer_type}) AS minor_version,
+        CAST(NULL AS #{integer_type}) AS patch_version,
+        CAST(NULL AS #{integer_type}) AS workflow,
+        CAST(NULL AS #{integer_type}) AS workflow_id,
+        users.firstname AS firstname,
+        users.lastname AS lastname,
+        users.id AS author,
+        'folder-link' AS type,
+        dmsf_links.deleted AS deleted,
+        'DmsfFolder' AS customized_type,
+        dmsf_folders.id AS customized_id,
+        dmsf_folders.description AS description,
+        '' AS comment,
+        (CASE WHEN dmsf_locks.id IS NULL THEN 0 ELSE 1 END) AS locked,
+        0 AS "system",
+        1 AS sort#{cf_columns}})
+                    .joins('LEFT JOIN dmsf_folders ON dmsf_links.target_id = dmsf_folders.id')
+                    .joins('LEFT JOIN users ON users.id = COALESCE(dmsf_folders.user_id, dmsf_links.user_id)')
+                    .joins("LEFT JOIN dmsf_locks ON dmsf_folders.id = dmsf_locks.entity_id AND
+                            dmsf_locks.entity_type = 1 AND (dmsf_locks.expires_at IS NULL OR
+                            dmsf_locks.expires_at > #{now})")
+    scope = deleted ? scope.deleted : scope.visible
+    if dmsf_folder_id
+      scope.where dmsf_links: { target_type: 'DmsfFolder', dmsf_folder_id: dmsf_folder_id }
+    elsif project.nil? && filters_on?
+      scope
+    elsif statement.present? || deleted
+      scope.where dmsf_links: { target_type: 'DmsfFolder', project_id: project&.id }
+    else
+      scope.where dmsf_links: { target_type: 'DmsfFolder', project_id: project&.id, dmsf_folder_id: nil }
+    end
+  end
+
+  def dmsf_files_scope
+    cf_columns = +''
+    DmsfFileRevisionCustomField.visible.order(:position).pluck(:id).each do |id|
+      cf_columns << get_cf_query(id, 'DmsfFileRevision', 'dmsf_file_revisions')
+    end
+    scope = DmsfFile.select(%{
+        dmsf_files.id AS id,
+        dmsf_files.project_id AS project_id,
+        dmsf_file_revisions.id AS revision_id,
+        dmsf_file_revisions.title AS title,
+        dmsf_file_revisions.name AS filename,
+        dmsf_file_revisions.size AS size,
+        dmsf_file_revisions.updated_at AS updated,
+        dmsf_file_revisions.major_version AS major_version,
+        dmsf_file_revisions.minor_version AS minor_version,
+        dmsf_file_revisions.patch_version AS patch_version,
+        dmsf_file_revisions.workflow AS workflow,
+        dmsf_file_revisions.dmsf_workflow_id AS workflow_id,
+        users.firstname AS firstname,
+        users.lastname AS lastname,
+        users.id AS author,
+        'file' AS type,
+        dmsf_files.deleted AS deleted,
+        'DmsfFileRevision' AS customized_type,
+        dmsf_file_revisions.id AS customized_id,
+        dmsf_file_revisions.description AS description,
+        dmsf_file_revisions.comment AS comment,
+        (CASE WHEN dmsf_locks.id IS NULL THEN 0 ELSE 1 END) AS locked,
+        0 AS "system",
+        2 AS sort#{cf_columns}})
+                    .joins(:dmsf_file_revisions)
+                    .joins('LEFT JOIN users ON dmsf_file_revisions.user_id = users.id ')
+                    .joins("LEFT JOIN dmsf_locks ON dmsf_files.id = dmsf_locks.entity_id AND dmsf_locks.entity_type = 0
+                            AND (dmsf_locks.expires_at IS NULL OR dmsf_locks.expires_at > #{now})")
+                    .where(sub_query)
+    scope = deleted ? scope.deleted : scope.visible
+    if dmsf_folder_id
+      scope.where dmsf_files: { dmsf_folder_id: dmsf_folder_id }
+    elsif project.nil? && filters_on?
+      scope
+    elsif statement.present? || deleted
+      scope.where dmsf_files: { project_id: project&.id }
+    else
+      scope.where(dmsf_files: { project_id: project&.id, dmsf_folder_id: nil })
+    end
+  end
+
+  def dmsf_file_links_scope
+    cf_columns = +''
+    DmsfFileRevisionCustomField.visible.order(:position).pluck(:id).each do |id|
+      cf_columns << get_cf_query(id, 'DmsfFileRevision', 'dmsf_file_revisions')
+    end
+    scope = DmsfLink.select(%{
+        dmsf_links.id AS id,
+        dmsf_files.project_id AS project_id,
+        dmsf_files.id AS revision_id,
+        dmsf_links.name AS title,
+        dmsf_file_revisions.name AS filename,
+        dmsf_file_revisions.size AS size,
+        dmsf_file_revisions.updated_at AS updated,
+        dmsf_file_revisions.major_version AS major_version,
+        dmsf_file_revisions.minor_version AS minor_version,
+        dmsf_file_revisions.patch_version AS patch_version,
+        dmsf_file_revisions.workflow AS workflow,
+        dmsf_file_revisions.dmsf_workflow_id AS workflow_id,
+        users.firstname AS firstname,
+        users.lastname AS lastname,
+        users.id AS author,
+        'file-link' AS type,
+        dmsf_links.deleted AS deleted,
+        'DmsfFileRevision' AS customized_type,
+        dmsf_file_revisions.id AS customized_id,
+        dmsf_file_revisions.description AS description,
+        dmsf_file_revisions.comment AS comment,
+        (CASE WHEN dmsf_locks.id IS NULL THEN 0 ELSE 1 END) AS locked,
+        0 AS "system",
+        2 AS sort#{cf_columns}})
+                    .joins('JOIN dmsf_files ON dmsf_files.id = dmsf_links.target_id')
+                    .joins('JOIN dmsf_file_revisions ON dmsf_file_revisions.dmsf_file_id = dmsf_files.id')
+                    .joins('LEFT JOIN users ON dmsf_file_revisions.user_id = users.id ')
+                    .joins("LEFT JOIN dmsf_locks ON dmsf_files.id = dmsf_locks.entity_id AND dmsf_locks.entity_type = 0
+                            AND (dmsf_locks.expires_at IS NULL OR dmsf_locks.expires_at > #{now})")
+                    .where(sub_query)
+    scope = deleted ? scope.deleted : scope.visible
+    if dmsf_folder_id
+      scope.where dmsf_links: { target_type: 'DmsfFile', dmsf_folder_id: dmsf_folder_id }
+    elsif project.nil? && filters_on?
+      scope
+    elsif statement.present? || deleted
+      scope.where dmsf_links: { target_type: 'DmsfFile', project_id: project&.id }
+    else
+      scope.where dmsf_links: { target_type: 'DmsfFile', project_id: project&.id, dmsf_folder_id: nil }
+    end
+  end
+
+  def dmsf_url_links_scope
+    cf_columns = +''
+    DmsfFileRevisionCustomField.visible.order(:position).pluck(:id).each do |id|
+      cf_columns << ",NULL AS cf_#{id}"
+    end
+    scope = DmsfLink.select(%{
+        dmsf_links.id AS id,
+        dmsf_links.project_id AS project_id,
+        CAST(NULL AS #{integer_type}) AS revision_id,
+        dmsf_links.name AS title,
+        dmsf_links.external_url AS filename,
+        CAST(NULL AS #{integer_type}) AS size,
+        dmsf_links.updated_at AS updated,
+        CAST(NULL AS #{integer_type}) AS major_version,
+        CAST(NULL AS #{integer_type}) AS minor_version,
+        CAST(NULL AS #{integer_type}) AS patch_version,
+        CAST(NULL AS #{integer_type}) AS workflow,
+        CAST(NULL AS #{integer_type}) AS workflow_id,
+        users.firstname AS firstname,
+        users.lastname AS lastname,
+        users.id AS author,
+        'url-link' AS type,
+        dmsf_links.deleted AS deleted,
+        '' AS customized_type,
+        0 AS customized_id,
+        '' AS description,
+        '' AS comment,
+        0 AS locked,
+        0 AS "system",
+        2 AS sort#{cf_columns}})
+                    .joins('LEFT JOIN users ON dmsf_links.user_id = users.id ')
+    scope = deleted ? scope.deleted : scope.visible
+    if dmsf_folder_id
+      scope.where dmsf_links: { target_type: 'DmsfUrl', dmsf_folder_id: dmsf_folder_id }
+    elsif project.nil? && filters_on?
+      scope
+    elsif statement.present? || deleted
+      scope.where dmsf_links: { target_type: 'DmsfUrl', project_id: project&.id }
+    else
+      scope.where dmsf_links: { target_type: 'DmsfUrl', project_id: project&.id, dmsf_folder_id: nil }
+    end
+  end
+end

app/models/dmsf_query_modified_column.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+require 'query'
+
+# Modify column
+class DmsfQueryModifiedColumn < QueryColumn
+  def value_object(object)
+    object.updated
+  end
+end

app/models/dmsf_query_title_column.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+require 'query'
+
+# Title column
+class DmsfQueryTitleColumn < QueryColumn
+  def css_classes
+    'dmsf-title'
+  end
+end

app/models/dmsf_query_version_column.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+require 'query'
+
+# Version column
+class DmsfQueryVersionColumn < QueryColumn
+  def value_object(object)
+    DmsfFileRevision.version object.major_version, object.minor_version, object.patch_version
+  end
+end

app/models/dmsf_upload.rb

@@ -0,0 +1,133 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+#  Vít Jonáš <vit.jonas@gmail.com>, Daniel Munn <dan.munn@munnster.co.uk>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Upload
+class DmsfUpload
+  attr_accessor :name, :disk_filename, :mime_type, :title, :description, :comment, :major_version, :minor_version,
+                :patch_version, :locked, :workflow, :custom_values, :tempfile_path, :digest, :token
+  attr_reader   :size
+
+  def disk_file
+    Rails.root.join 'tmp', disk_filename
+  end
+
+  def self.create_from_uploaded_attachment(project, folder, uploaded_file)
+    a = Attachment.find_by_token(uploaded_file[:token]) if uploaded_file[:token].present?
+    if a
+      uploaded = {
+        disk_filename: DmsfHelper.temp_filename(a.filename),
+        content_type: a.content_type,
+        original_filename: a.filename,
+        comment: uploaded_file[:description],
+        tempfile_path: a.diskfile,
+        token: uploaded_file[:token],
+        digest: a.digest
+      }
+      DmsfUpload.new project, folder, uploaded
+    else
+      Rails.logger.error "An attachment not found by its token: #{uploaded_file[:token]}"
+      nil
+    end
+  end
+
+  def initialize(project, folder = nil, uploaded = nil)
+    unless uploaded
+      @name = ''
+      @disk_filename = ''
+      @mime_type = ''
+      @size = 0
+      @tempfile_path = ''
+      @token = ''
+      @digest = ''
+      if RedmineDmsf.empty_minor_version_by_default?
+        @major_version = 1
+        @minor_version = nil
+      else
+        @major_version = 0
+        @minor_version = 0
+      end
+      @patch_version = nil
+      @workflow = nil
+      revision = DmsfFileRevision.new
+      @custom_values = revision.custom_field_values
+      return
+    end
+
+    @name = uploaded[:original_filename]
+
+    file = DmsfFile.find_file_by_name(project, folder, @name)
+    unless file
+      link = DmsfLink.find_link_by_file_name(project, folder, @name)
+      file = link.target_file if link
+    end
+
+    @disk_filename = uploaded[:disk_filename]
+    @mime_type = uploaded[:content_type]
+    @size = File.size?(uploaded[:tempfile_path])
+    unless @size
+      @size = 0
+      Rails.logger.error "Cannot find #{uploaded[:tempfile_path]}"
+    end
+    @tempfile_path = uploaded[:tempfile_path]
+    @token = uploaded[:token]
+    @digest = uploaded[:digest]
+
+    if file.nil? || file.last_revision.nil?
+      @title = DmsfFileRevision.filename_to_title(@name)
+      @description = uploaded[:comment]
+      if RedmineDmsf.empty_minor_version_by_default?
+        @major_version = 1
+        @minor_version = nil
+      else
+        @major_version = 0
+        @minor_version = 0
+      end
+      @patch_version = nil
+      @workflow = nil
+      file = DmsfFile.new
+      file.project_id = project.id
+      revision = DmsfFileRevision.new
+      revision.dmsf_file = file
+      @custom_values = revision.custom_field_values
+    else
+      last_revision = file.last_revision
+      @title = last_revision.title
+      if last_revision.description.present?
+        @description = last_revision.description
+        @comment = uploaded[:comment] if uploaded[:comment].present?
+      elsif uploaded[:comment].present?
+        @comment = uploaded[:comment]
+      end
+      @major_version = last_revision.major_version
+      @minor_version = last_revision.minor_version
+      @patch_version = last_revision.patch_version
+      @workflow = last_revision.workflow
+      @custom_values = Array.new(file.last_revision.custom_values)
+
+      # Add default value for CFs not existing
+      present_custom_fields = file.last_revision.custom_values.collect(&:custom_field).uniq
+      file.last_revision.available_custom_fields.each do |cf|
+        if cf.default_value && present_custom_fields.exclude?(cf)
+          @custom_values << CustomValue.new({ custom_field: cf, value: cf.default_value })
+        end
+      end
+    end
+    @locked = file&.locked_for_user?
+  end
+end

app/models/dmsf_workflow.rb

@@ -0,0 +1,259 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Workflow
+class DmsfWorkflow < ApplicationRecord
+  has_many :dmsf_workflow_steps, -> { order(step: :asc) }, dependent: :destroy, inverse_of: :dmsf_workflow
+  belongs_to :author, class_name: 'User'
+
+  scope :sorted, -> { order name: :asc }
+  scope :global, -> { where project_id: nil }
+  scope :active, -> { where status: STATUS_ACTIVE }
+  scope :status, ->(arg) { where arg.blank? ? nil : { status: arg.to_i } }
+
+  validates :name, presence: true, length: { maximum: 255 }, dmsf_workflow_name: true
+
+  STATE_ASSIGNED = 3
+  STATE_WAITING_FOR_APPROVAL = 1
+  STATE_APPROVED = 2
+  STATE_REJECTED = 4
+  STATE_OBSOLETE = 5
+
+  STATUS_LOCKED = 0
+  STATUS_ACTIVE = 1
+
+  def self.workflow_str(workflow)
+    case workflow
+    when STATE_WAITING_FOR_APPROVAL
+      l(:title_waiting_for_approval)
+    when STATE_APPROVED
+      l(:title_approved)
+    when STATE_ASSIGNED
+      l(:title_assigned)
+    when STATE_REJECTED
+      l(:title_rejected)
+    when DmsfWorkflow::STATE_OBSOLETE
+      l(:title_obsolete)
+    end
+  end
+
+  def self.workflow_info(workflow, workflow_id, revision_id)
+    text = ''
+    names = ''
+    if workflow.to_i == STATE_WAITING_FOR_APPROVAL
+      dmsf_workflow = DmsfWorkflow.find_by(id: workflow_id)
+      if dmsf_workflow
+        assignments = dmsf_workflow.next_assignments(revision_id)
+        if assignments.any?
+          user_ids = assignments.map(&:user_id)
+          names = User.where(id: user_ids).all.map(&:name).join(',')
+          workflow_step_id = assignments.first[:dmsf_workflow_step_id]
+          if workflow_step_id
+            step = DmsfWorkflowStep.find_by(id: workflow_step_id)
+            text = step.name if step&.name.present?
+          end
+        end
+      end
+    end
+    text = DmsfWorkflow.workflow_str(workflow.to_i) if text.blank?
+    [text, names]
+  end
+
+  def participiants
+    users = []
+    dmsf_workflow_steps.each do |step|
+      users << step.user unless users.include? step.user
+    end
+    users
+  end
+
+  def self.workflows(project)
+    where(project_id: project)
+  end
+
+  def project
+    Project.find_by(id: project_id) if project_id
+  end
+
+  def to_s
+    name
+  end
+
+  def reorder_steps(step, move_to)
+    DmsfWorkflow.transaction do
+      dmsf_workflow_steps.each do |ws|
+        if ws.step == step
+          ws.update_attribute :step, move_to
+        elsif ws.step >= move_to && ws.step < step
+          # Move up
+          ws.update_attribute :step, ws.step + 1
+        elsif ws.step <= move_to && ws.step > step
+          # Move down
+          ws.update_attribute :step, ws.step - 1
+        end
+      end
+    end
+  end
+
+  def delegates(query, dmsf_workflow_step_assignment_id, dmsf_file_revision_id)
+    sql = if dmsf_workflow_step_assignment_id && dmsf_file_revision_id
+            [
+              %(id NOT IN (SELECT a.user_id FROM dmsf_workflow_step_assignments a WHERE id = ?)
+                AND id IN (SELECT m.user_id FROM members m JOIN dmsf_files f ON f.project_id = m.project_id
+                JOIN dmsf_file_revisions r ON r.dmsf_file_id = f.id WHERE r.id = ?)),
+              dmsf_workflow_step_assignment_id, dmsf_file_revision_id
+            ]
+          elsif project
+            ['id IN (SELECT user_id FROM members WHERE project_id = ?)', project.id]
+          else
+            '1=1'
+          end
+
+    if query.present?
+      User.active.sorted.where(sql).like query
+    else
+      User.active.sorted.where sql
+    end
+  end
+
+  def next_assignments(dmsf_file_revision_id)
+    results = []
+    nsteps = dmsf_workflow_steps.collect(&:step).uniq
+    nsteps.each do |i|
+      step_is_finished = false
+      steps = dmsf_workflow_steps.filter_map { |s| s.step == i ? s : nil }
+      steps.each do |step|
+        step.dmsf_workflow_step_assignments.where(dmsf_file_revision_id: dmsf_file_revision_id)
+            .find_each do |assignment|
+          assignment.dmsf_workflow_step_actions.find_each do |action|
+            case action.action
+            when DmsfWorkflowStepAction::ACTION_APPROVE
+              step_is_finished = true
+              # Try to find another unfinished AND step
+              exists = false
+              stps = dmsf_workflow_steps
+                     .filter_map { |s| s.step == i && s.operator == DmsfWorkflowStep::OPERATOR_AND ? s : nil }
+              stps.each do |s|
+                s.dmsf_workflow_step_assignments.where(dmsf_file_revision_id: dmsf_file_revision_id).find_each do |a|
+                  exists = a.add?(dmsf_file_revision_id)
+                  break if exists
+                end
+                break if exists
+              end
+              step_is_finished = false if exists
+              break
+            when DmsfWorkflowStepAction::ACTION_REJECT
+              return []
+            end
+          end
+          break if step_is_finished
+        end
+        break if step_is_finished
+      end
+      next if step_is_finished
+
+      steps.each do |step|
+        step.dmsf_workflow_step_assignments.where(dmsf_file_revision_id: dmsf_file_revision_id)
+            .find_each do |assignment|
+          results << assignment if assignment.add?(dmsf_file_revision_id)
+        end
+      end
+      return results
+    end
+    results
+  end
+
+  def assign(dmsf_file_revision_id)
+    dmsf_workflow_steps.each do |ws|
+      ws.assign(dmsf_file_revision_id)
+    end
+  end
+
+  def try_finish?(revision, action, user_id)
+    case action.action
+    when DmsfWorkflowStepAction::ACTION_APPROVE
+      assignments = next_assignments(revision.id)
+      return false unless assignments.empty?
+
+      revision.workflow = DmsfWorkflow::STATE_APPROVED
+      revision.save!
+      return true
+    when DmsfWorkflowStepAction::ACTION_REJECT
+      revision.workflow = DmsfWorkflow::STATE_REJECTED
+      revision.save!
+      return true
+    when DmsfWorkflowStepAction::ACTION_DELEGATE
+      dmsf_workflow_steps.each do |step|
+        step.dmsf_workflow_step_assignments.each do |assignment|
+          next unless assignment.id == action.dmsf_workflow_step_assignment_id
+
+          assignment.user_id = user_id
+          assignment.save!
+          return false
+        end
+      end
+    end
+    false
+  end
+
+  def copy_to(project, name = nil)
+    new_wf = dup
+    new_wf.name = name if name
+    new_wf.project_id = project&.id
+    new_wf.author = User.current
+    if new_wf.save
+      dmsf_workflow_steps.each do |step|
+        step.copy_to(new_wf)
+      end
+    end
+    new_wf
+  end
+
+  def locked?
+    status == STATUS_LOCKED
+  end
+
+  def active?
+    status == STATUS_ACTIVE
+  end
+
+  def notify_users(project, revision, controller)
+    assignments = next_assignments(revision.id)
+    recipients = assignments.collect(&:user).uniq
+    recipients &= DmsfMailer.get_notify_users(project, revision.dmsf_file, force_notification: true)
+    DmsfMailer.deliver_workflow_notification(
+      recipients,
+      self,
+      revision,
+      :text_email_subject_started,
+      :text_email_started,
+      :text_email_to_proceed,
+      nil,
+      assignments.first&.dmsf_workflow_step
+    )
+    return unless RedmineDmsf.dmsf_display_notified_recipients? && controller && recipients.present?
+
+    max_recipients = RedmineDmsf.dmsf_max_notification_receivers_info
+    to = recipients.collect(&:name).first(max_recipients).join(', ')
+    return if to.blank?
+
+    to << (recipients.count > max_recipients.to_i ? ',...' : '.')
+    controller.flash[:warning] = l(:warning_email_notifications, to: to) if controller
+  end
+end

app/models/dmsf_workflow_step.rb

@@ -0,0 +1,69 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Workflow step
+class DmsfWorkflowStep < ApplicationRecord
+  belongs_to :dmsf_workflow
+  belongs_to :user
+
+  has_many :dmsf_workflow_step_assignments, dependent: :destroy
+
+  validates :step, presence: true
+  validates :operator, presence: true
+  validates :user_id, uniqueness: { scope: %i[dmsf_workflow_id step], case_sensitive: true }
+  validates :name, length: { maximum: 30 }
+
+  OPERATOR_OR  = 0
+  OPERATOR_AND = 1
+
+  def soperator
+    DmsfWorkflowStep.soperator(operator)
+  end
+
+  def self.soperator(operator)
+    operator == 1 ? l(:dmsf_and) : l(:dmsf_or)
+  end
+
+  def assign(dmsf_file_revision_id)
+    step_assignment = DmsfWorkflowStepAssignment.new
+    step_assignment.dmsf_workflow_step_id = id
+    step_assignment.user_id = user_id
+    step_assignment.dmsf_file_revision_id = dmsf_file_revision_id
+    step_assignment.save!
+  end
+
+  def finished?(dmsf_file_revision_id)
+    dmsf_workflow_step_assignments.each do |assignment|
+      next if assignment.dmsf_file_revision_id == dmsf_file_revision_id
+
+      return false if assignment.dmsf_workflow_step_actions.empty?
+
+      assignment.dmsf_workflow_step_actions.each do |act|
+        return false unless act.finished?
+      end
+    end
+  end
+
+  def copy_to(workflow)
+    new_step = dup
+    new_step.dmsf_workflow_id = workflow.id
+    new_step.save!
+    new_step
+  end
+end

app/models/dmsf_workflow_step_action.rb

@@ -0,0 +1,98 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Workflow step action
+class DmsfWorkflowStepAction < ApplicationRecord
+  belongs_to :dmsf_workflow_step_assignment
+  belongs_to :author, class_name: 'User'
+
+  validates :action, presence: true
+  validates :note, presence: true, unless: -> { action == DmsfWorkflowStepAction::ACTION_APPROVE }
+  validates :dmsf_workflow_step_assignment_id,
+            unless: -> { action == DmsfWorkflowStepAction::ACTION_DELEGATE },
+            uniqueness: { scope: [:action], case_sensitive: true }
+
+  ACTION_APPROVE = 1
+  ACTION_REJECT = 2
+  ACTION_DELEGATE = 3
+  ACTION_ASSIGN = 4
+  ACTION_START = 5
+
+  def initialize(*args)
+    super
+    self.author_id = User.current.id if User.current
+  end
+
+  def self.finished?(action)
+    [DmsfWorkflowStepAction::ACTION_APPROVE, DmsfWorkflowStepAction::ACTION_REJECT].include? action
+  end
+
+  def finished?
+    DmsfWorkflowStepAction.finished? action
+  end
+
+  def self.action_str(action)
+    return unless action
+
+    case action.to_i
+    when ACTION_APPROVE
+      l(:title_approval)
+    when ACTION_REJECT
+      l(:title_rejection)
+    when ACTION_DELEGATE
+      l(:title_delegation)
+    when ACTION_ASSIGN
+      l(:title_assignment)
+    when ACTION_START
+      l(:title_start)
+    end
+  end
+
+  def self.action_type_str(action)
+    return unless action
+
+    case action.to_i
+    when ACTION_APPROVE
+      'approval'
+    when ACTION_REJECT
+      'rejection'
+    when ACTION_DELEGATE
+      'delegation'
+    when ACTION_ASSIGN
+      'assignment'
+    when ACTION_START
+      'start'
+    end
+  end
+
+  def self.workflow_str(action)
+    return unless action
+
+    case action.to_i
+    when ACTION_REJECT
+      l(:title_rejected)
+    when ACTION_ASSIGN
+      l(:title_assigned)
+    when ACTION_START, ACTION_DELEGATE, ACTION_APPROVE
+      l(:title_waiting_for_approval)
+    else
+      l(:title_none)
+    end
+  end
+end

app/models/dmsf_workflow_step_assignment.rb

@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Workflow step assignment
+class DmsfWorkflowStepAssignment < ApplicationRecord
+  belongs_to :dmsf_workflow_step
+  belongs_to :user
+  belongs_to :dmsf_file_revision
+
+  has_many :dmsf_workflow_step_actions, dependent: :destroy
+
+  validates :dmsf_workflow_step_id, uniqueness: { scope: [:dmsf_file_revision_id], case_sensitive: true }
+
+  def add?(dmsf_file_revision_id)
+    if dmsf_file_revision_id == self.dmsf_file_revision_id
+      add = true
+      dmsf_workflow_step_actions.each do |action|
+        if action.finished?
+          add = false
+          break
+        end
+      end
+      return add
+    end
+    false
+  end
+end

app/validators/dmsf_file_extension_validator.rb

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Vít Jonáš <vit.jonas@gmail.com>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# File extension validator according to the Redmine whitelist and blacklist for file upload.
+class DmsfFileExtensionValidator < ActiveModel::EachValidator
+  include Redmine::I18n
+
+  def validate_each(record, attribute, value)
+    return unless attribute.to_s == 'name'
+
+    extension = File.extname(value)
+    return if Attachment.valid_extension?(extension)
+
+    record.errors.add(:base, l(:error_attachment_extension_not_allowed, extension: extension))
+  end
+end

app/validators/dmsf_file_name_validator.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Vít Jonáš <vit.jonas@gmail.com>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# File name validator
+class DmsfFileNameValidator < ActiveModel::EachValidator
+  ALL_INVALID_CHARACTERS = /\A[^#{DmsfFolder::INVALID_CHARACTERS}]*\z/
+
+  def validate_each(record, attribute, value)
+    record.errors.add attribute, :error_contains_invalid_character unless ALL_INVALID_CHARACTERS.match?(value)
+  end
+end

app/validators/dmsf_folder_parent_validator.rb

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Folder parent validator
+class DmsfFolderParentValidator < ActiveModel::EachValidator
+  # Don't allow save folders with a parent pointing to the same folder
+  def validate_each(record, attribute, value)
+    folder = value
+    while folder
+      if folder == record
+        record.errors.add attribute, :invalid
+        return
+      end
+      folder = folder.dmsf_folder
+    end
+  end
+end

app/validators/dmsf_max_file_size_validator.rb

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Vít Jonáš <vit.jonas@gmail.com>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Max file size validator
+class DmsfMaxFileSizeValidator < ActiveModel::EachValidator
+  include Redmine::I18n
+
+  def validate_each(record, attribute, value)
+    return unless value && (value > Setting.attachment_max_size.to_i.kilobytes)
+
+    record.errors.add attribute,
+                      l(:error_attachment_too_big, max_size: ActiveSupport::NumberHelper.number_to_human_size(
+                        Setting.attachment_max_size.to_i.kilobytes
+                      ))
+  end
+end

app/validators/dmsf_url_validator.rb

@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Vít Jonáš <vit.jonas@gmail.com>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# URL validator
+class DmsfUrlValidator < ActiveModel::EachValidator
+  def validate_each(record, attribute, value)
+    return unless record.target_type == 'DmsfUrl'
+
+    begin
+      if value.present?
+        # https://www.google.com/search?q=寿司
+        URI.parse value.split('?').first
+      else
+        record.errors.add attribute, :invalid
+      end
+    rescue URI::InvalidURIError => e
+      record.errors.add attribute, :invalid
+      Rails.logger.error e.message
+    end
+  end
+end

app/validators/dmsf_workflow_name_validator.rb

@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+# Redmine plugin for Document Management System "Features"
+#
+# Vít Jonáš <vit.jonas@gmail.com>, Karel Pičman <karel.picman@kontron.com>
+#
+# This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+
+# Workflow name validator
+class DmsfWorkflowNameValidator < ActiveModel::EachValidator
+  def validate_each(record, attribute, value)
+    if record.project_id
+      if record.id
+        if DmsfWorkflow.exists?(['(project_id IS NULL OR (project_id = ? AND id != ?)) AND name = ?',
+                                 record.project_id,
+                                 record.id, value])
+          record.errors.add attribute, :taken
+        end
+      elsif DmsfWorkflow.exists?(['(project_id IS NULL OR project_id = ?) AND name = ?', record.project_id, value])
+        record.errors.add attribute, :taken
+      end
+    elsif record.id
+      record.errors.add attribute, :taken if DmsfWorkflow.exists?(['name = ? AND id != ?', value, record.id])
+    elsif DmsfWorkflow.exists?(name: value)
+      record.errors.add attribute, :taken
+    end
+  end
+end

app/views/dmsf/_add_email.html.erb

@@ -0,0 +1,34 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<h3 class="title"><%= l(:label_email_address_add) %></h3>
+
+<%= form_tag(append_email_dmsf_path(id: @project), remote: true, method: :post, id: 'new-user-form') do %>
+  <%= hidden_field_tag :project_id, @project.id %>
+  <p><%= label_tag 'user_search', l(:label_user_search) %><%= text_field_tag 'user_search', nil %></p>
+  <%= javascript_tag "observeSearchfield('user_search', 'users_for_users', '#{ escape_javascript url_for(
+    controller: 'dmsf', action: 'autocomplete_for_user') }')" %>
+  <div id="users_for_watcher">
+    <%= render_principals_for_new_email @principals %>
+  </div>
+  <p class="buttons">
+    <%= submit_tag l(:button_add), name: nil, onclick: 'hideModal(this);' %>
+    <%= submit_tag l(:button_cancel), name: nil, onclick: 'hideModal(this);', type: 'button' %>
+  </p>
+<% end %>

app/views/dmsf/_custom_fields.html.erb

@@ -0,0 +1,33 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Vít Jonáš <vit.jonas@gmail.com>, Daniel Munn <dan.munn@munnster.co.uk>, Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<% if object %>
+  <div>
+    <% object.custom_field_values.each do |custom_value| %>
+      <% unless custom_value.value.blank? %>
+        <div class="status attribute">
+          <%= content_tag :div, h(custom_value.custom_field.name), class: 'label' %>
+          <div class="value">
+            <%= show_value custom_value %>
+          </div>
+        </div>
+      <% end %>
+    <% end %>
+  </div>
+<% end %>

app/views/dmsf/_description.html.erb

@@ -0,0 +1,35 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<% if @project %>
+  <div class="dmsf-header">
+    <div class="wiki dmsf-description">
+      <%= textilizable @folder ? @folder.description : @project.dmsf_description %>
+    </div>
+    <% if @folder && @folder.custom_field_values.any? { |o| o.value.present? } %>
+      <ul>
+        <% render_custom_field_values(@folder) do |custom_field, formatted| %>
+          <li class="<%= custom_field.css_classes %>">
+            <span class="label"><%= custom_field.name %>:</span> <%= formatted %>
+          </li>
+        <% end %>
+      </ul>
+    <% end %>
+  </div>
+<% end %>

app/views/dmsf/_digest.html.erb

@@ -0,0 +1,29 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<p>
+  <%= l(:text_dmsf_webdav_digest_reset) %>
+</p>
+<%= form_tag(dmsf_reset_digest_path) do %>
+  <label for="password">
+    <%= l(:field_password) %>
+  </label>
+  <%= password_field_tag 'password', nil, autofocus: true %>
+  <input type="submit" name="reset" value="<%= l(:button_reset) %>" onclick="hideModal(this);">
+<% end %>

app/views/dmsf/_main.html.erb

@@ -0,0 +1,96 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Vít Jonáš <vit.jonas@gmail.com>, Daniel Munn <dan.munn@munnster.co.uk>, Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<% html_title l(:dmsf) %>
+<% if @project %>
+  <div class="contextual">
+    <% unless @locked || @system_folder %>
+      <% if @file_manipulation_allowed %>
+        <%= link_to sprite_icon('add', l(:label_document_new)),
+                    multi_dmsf_upload_path(id: @project, folder_id: @folder), class: 'icon icon-add',
+                    data: { cy: 'button__new-file--dmsf' } %>
+      <% end %>
+      <% if @folder_manipulation_allowed %>
+        <%= link_to sprite_icon('add', l(:link_create_folder)), new_dmsf_path(id: @project, parent_id: @folder),
+                    class: 'icon icon-add', data: { cy: 'button__create-folder--dmsf' } %>
+      <% end %>
+    <% end %>
+    <%= actions_dropdown do %>
+      <%= render partial: 'dmsf_context_menus/main', locals: {
+          folder_manipulation_allowed: @folder_manipulation_allowed,
+          system_folder: @system_folder,
+          folder: @folder,
+          project: @project,
+          locked: @locked,
+          file_manipulation_allowed: @file_manipulation_allowed,
+          trash_enabled: @trash_enabled,
+          notifications: @notifications} %>
+    <% end %>
+  </div>
+<% end %>
+
+<%= render partial: 'path', locals: { folder: @folder, filename: nil, title: nil } %>
+
+<%= render partial: 'description' %>
+
+<%= form_tag(@project ? dmsf_folder_path(id: @project, folder_id: @folder) : dmsf_index_path,
+             method: :get, id: 'query_form', class: 'dmsf-query-form') do %>
+  <%= hidden_field_tag('folder_id', @folder.id) if @folder %>
+  <div id="dmsf-query-form">
+    <%= render partial: 'queries/query_form' %>
+  </div>
+<% end %>
+<% if @query.valid? %>
+  <% if @dmsf_count == 0 %>
+    <p class="nodata"><%= l(:label_no_data) %></p>
+  <% else %>
+    <%= render partial: 'query_list', locals: { query: @query, dmsf_pages: @dmsf_pages, folder: @folder } %>
+    <span class="pagination"><%= pagination_links_full @dmsf_pages, @dmsf_count %></span>
+  <% end %>
+<% end %>
+
+<%= context_menu %>
+
+<% if !@folder&.system && (@project || RedmineDmsf.dmsf_webdav?) %>
+    <% other_formats_links do |f| %>
+      <% if @project %>
+        <%= f.link_to 'CSV', url: { action: :show, id: @project, folder_id: @folder, encoding: Encoding::UTF_8 } %>
+      <% end %>
+      <% if RedmineDmsf.dmsf_webdav? %>
+        <span>
+          <%= link_to 'WebDAV', webdav_url(@project, @folder), class: 'webdav' %>
+        </span>
+      <% end %>
+    <% end %>
+<% end %>
+
+<% content_for :sidebar do %>
+  <%= render partial: 'dmsf/sidebar' %>
+
+  <% project_or_folder = @folder? @folder : @project %>
+  <% if project_or_folder&.watchers.present? && User.current.allowed_to?(:view_dmsf_folder_watchers, @project) %>
+    <div id="watchers">
+      <%= render partial: 'watchers/watchers', locals: { watched: @folder ? @folder : @project } %>
+    </div>
+  <% end %>
+<% end %>
+
+<% javascript_tag do %>
+  "$('#ajax-indicator').hide();"
+<% end %>

app/views/dmsf/_path.html.erb

@@ -0,0 +1,49 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<h2 class="dmsf-header">
+  <% if folder %>
+    <%= link_to l(:link_documents), dmsf_folder_path(id: @project) %>
+    <% folder.dmsf_path.each do |path_element| %>
+      /
+      <% if filename.blank? && (path_element == folder.dmsf_path.last) %>
+        <%= h(path_element.title) %>
+      <% else %>
+        <%= link_to h(path_element.title), dmsf_folder_path(id: @project, folder_id: path_element) %>
+      <% end %>
+    <% end %>
+    <% if folder.locked? && !(filename || title) %>
+      <%= content_tag('span', sprite_icon('unlock', nil, icon_only: true, size: '12'),
+                      title: l(:title_locked_by_user, user: folder.locked_by)) %>
+    <% end %>
+  <% else %>
+    <% if @project %>
+      <%= link_to l(:link_documents), dmsf_folder_path(id: @project) %>
+    <% else %>
+      <%= l(:link_documents) %>
+    <% end %>
+  <% end %>
+  <% if filename %>
+    /
+    <%= h(filename) %>
+  <% end %>
+  <% if title %>
+    &#187; <%= title %>
+  <% end %>
+</h2>

app/views/dmsf/_query_list.html.erb

@@ -0,0 +1,44 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<% query_options = nil unless defined?(query_options) %>
+<% query_options ||= {} %>
+
+<%= form_tag({}, data: { cm_url: query.deleted ? dmsf_trash_context_menu_path : dmsf_context_menu_path(folder_id: folder) }) do %>
+  <%= hidden_field_tag 'back_url', url_for(params: request.query_parameters), id: nil %>
+  <%= query_columns_hidden_tags(query) %>
+  <div class="autoscroll">
+    <table class="list dmsf odd-even <%= query.css_classes %> context-menu-container" data-hascontextmenu="true">
+      <thead>
+      <tr>
+        <th class="checkbox hide-when-print">
+          <%= check_box_tag 'check_all', '', false, class: 'toggle-selection', title: "#{l(:button_check_all)}/#{l(:button_uncheck_all)}" %>
+        </th>
+        <% query.inline_columns.each do |column| %>
+          <%= column_header(query, column, query_options) %>
+        <% end %>
+        <th class="buttons"></th>
+      </tr>
+      </thead>
+      <tbody>
+      <%= render partial: 'query_rows', locals: { query: query, dmsf_pages: dmsf_pages } %>
+      </tbody>
+    </table>
+  </div>
+<% end %>

app/views/dmsf/_query_rows.erb

@@ -0,0 +1,110 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<% options = {} %>
+<% if dmsf_pages %>
+  <% options[:offset] = dmsf_pages.offset %>
+  <% options[:limit] = dmsf_pages.per_page %>
+<% end %>
+<% query.dmsf_nodes(options).each do |node| %>
+  <% case node.type %>
+  <% when 'project'%>
+    <% id = "#{node.id}pspan" %>
+  <% when 'folder' %>
+    <% id = "#{node.id}fspan" %>
+  <% else %>
+    <% id = "#{node.id}item" %>
+  <% end %>
+  <% @idnt ||= 0 %>
+  <tr id="<%= id %>" data-cy="row__<%= node.title %>--<%= node.type %>_<%= node.id %>"
+      class="<%= cycle('odd', 'even') %>
+    <%= node.css_classes(query.deleted) %> <%= params[:classes] %> <%= @idnt > 0 ? "idnt idnt-#{@idnt}" : nil %>">
+    <td class="checkbox hide-when-print">
+      <%= check_box_tag('ids[]', "#{node.type}-#{node.id}", false, id: nil) unless node.system %>
+    </td>
+    <% query.inline_columns.each do |column| %>
+      <% classes = column.css_classes.to_s.dup %>
+      <%  classes << ' dmsf-gray' if node.type.match?(/link$/) %>
+      <%  classes << ' dmsf-system' if node.system %>
+      <%= content_tag 'td', column_content(column, node), class: classes %>
+    <% end %>
+    <td class="buttons">
+      <% unless node.system %>
+        <%= link_to_context_menu %>
+      <% end %>
+    </td>
+  </tr>
+<% end %>
+
+<% unless query.deleted || query&.project.nil? %>
+  <%= javascript_tag do %>
+    $(function() {
+      $("table.dmsf tr").removeClass("ui-draggable-dragging ui-droppable-active ui-droppable-hover ui-draggable-handle");
+      $(".dmsf-draggable").draggable({
+        helper: function(event, ui) {
+          var ret = $(this).clone();
+          var width = $(this)[0].offsetWidth;
+          var myHelper = [];
+          myHelper.push('<table style="width: ' + width + 'px; background-color: #ffffdd;">');
+          myHelper.push(ret.html());
+          myHelper.push('</table>');
+          helper = myHelper.join('');
+          return helper;
+        },
+        axis: "y",
+        revert: "invalid"
+      });
+      $(".dmsf-droppable" ).droppable({
+        drop: function(event, ui) {
+          let handle = $(this);
+          let dragObjectId = ui.draggable.find("td").find("input").val()
+          let dropObjectId = handle.attr('id');
+          let data = {};
+          handle.addClass("ui-state-highlight ajax-loading")
+          data['dmsf_folder'] = { drag_id: dragObjectId, drop_id: dropObjectId};
+          $.ajax({
+            url: '<%= dmsf_folder_url(query.project) %>',
+            type: 'put',
+            dataType: 'script',
+            data: data,
+            error: function(jqXHR, textStatus, errorThrown){
+              alert(errorThrown);
+              ui.draggable.animate(ui.draggable.data("ui-draggable").originalPosition, "slow");
+            },
+            complete: function(jqXHR, textStatus, errorThrown){
+              handle.removeClass("ui-state-highlight ajax-loading")
+              if(textStatus == 'success'){
+                if(!handle.hasClass('dmsf-not-loaded')){
+                  var m = handle.attr("id").match(/^(\d+)span$/);
+                  if(m){
+                    $('.' + m[1]).remove();
+                    handle.removeClass("dmsf-expanded");
+                    handle.addClass("dmsf-collapsed dmsf-not-loaded");
+                  }
+                  ui.draggable.remove();
+                }
+                window.location.reload();
+              }
+            }
+          });
+        }
+      });
+    });
+  <% end %>
+<% end %>

app/views/dmsf/_sidebar.html.erb

@@ -0,0 +1,20 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Vít Jonáš <vit.jonas@gmail.com>, Daniel Munn <dan.munn@munnster.co.uk>, Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<%= render_sidebar_queries DmsfQuery, @project %>

app/views/dmsf/add_email.js.erb

@@ -0,0 +1,24 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+%>
+
+var modal = $('#ajax-modal');
+
+modal.html("<%= escape_javascript(render partial: 'dmsf/add_email') %>");
+showModal('ajax-modal', '400px');
+modal.addClass('new-user');

app/views/dmsf/append_email.js.erb

@@ -0,0 +1,30 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+ # This file is part of Redmine DMSF plugin.
+#
+# Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+# Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+# the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+# <https://www.gnu.org/licenses/>.
+%>
+
+let to = $('#email_to');
+let text = to.val();
+<% @principals.each do |p| %>
+  if(text.indexOf("<%= p.mail %>") < 0){
+    if(text.length > 0){
+        text += ', '
+    }
+    text += "<%= p.mail %>"
+  }
+<% end %>
+to.val(text);

app/views/dmsf/autocomplete_for_user.js.erb

@@ -0,0 +1,20 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+$('#users_for_watcher').html('<%= escape_javascript(render_principals_for_new_email(@principals)) %>');

app/views/dmsf/copymove.html.erb

@@ -0,0 +1,72 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Vít Jonáš <vit.jonas@gmail.com>, Daniel Munn  <dan.munn@munnster.co.uk>, Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<%= render partial: '/dmsf/path', locals: { folder: @folder, filename: nil, title: nil } %>
+
+<% if @projects.present? || @fast_links %>
+  <%= form_tag(entries_operations_dmsf_path, id: 'copyForm') do %>
+    <% @ids.each do |id| %>
+      <%= hidden_field_tag 'ids[]', id %>
+    <% end %>
+    <%= hidden_field_tag 'back_url', @back_url %>
+    <%= hidden_field_tag 'id', @project %>
+    <%= hidden_field_tag 'copy_entries', true %>
+    <%= hidden_field_tag 'move_entries', true %>
+    <div class="box tabular">
+      <% unless @fast_links %>
+        <p>
+          <%= label_tag 'dmsf_entries[target_project_id]', l(:field_target_project) %>
+          <%= select_tag 'dmsf_entries[target_project_id]',
+                         project_tree_options_for_select(@projects, selected: @target_project) %>
+        </p>
+      <% end %>
+      <p>
+        <%= label_tag 'dmsf_entries[target_folder_id]', l(:field_target_folder) %><%= ' #' if @fast_links %>
+        <% if @fast_links %>
+          <%= text_field_tag 'dmsf_entries[target_folder_id]', '', required: true, max_length: 255 %>
+        <% else %>
+          <%= select_tag 'dmsf_entries[target_folder_id]', options_for_select(@folders, selected: @target_folder&.id) %>
+        <% end %>
+      </p>
+    </div>
+    <p>
+      <%= submit_tag l(:button_copy), id: 'copy_button', data: { cy: "button__copy--dmsf" } %>
+      <%# TODO: Lock and proper permissions %>
+      <% if User.current.allowed_to?(:folder_manipulation, @project) &&
+        User.current.allowed_to?(:file_manipulation, @project) %>
+        <%= submit_tag l(:button_move), id: 'move_button', data: { cy: "button__move--dmsf" } %>
+      <% end %>
+    </p>
+  <% end %>
+<% end %>
+
+<%= javascript_tag do %>
+  $('#move_button').click(function(event) {
+    $('input#copy_entries').remove()
+  });
+  <% unless @fast_links %>
+    $('#dmsf_entries_target_project_id').change(function () {
+      $('#content').load("<%= copymove_entries_path(id: @project, folder_id: @folder, ids: @ids) %>",
+                          $('#copyForm').serialize());
+    });
+    $('#dmsf_entries_target_project_id').select2();
+    $('#dmsf_entries_target_folder_id').select2();
+  <% end %>
+<% end %>
+

app/views/dmsf/create.api.rsb

@@ -0,0 +1,4 @@
+api.dmsf_folder do    
+  api.id @folder.id     
+  api.title @folder.title    
+end

app/views/dmsf/digest.js.erb

@@ -0,0 +1,21 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+$('#ajax-modal').html('<%= escape_javascript render partial: 'digest' %>');
+showModal('ajax-modal', '30%', '<%= l(:label_dmsf_webdav_digest) %>');

app/views/dmsf/drop.js.erb

@@ -0,0 +1,20 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+throw new Error("<%= j flash[:error] %>");

app/views/dmsf/edit.html.erb

@@ -0,0 +1,128 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Vít Jonáš <vit.jonas@gmail.com>, Daniel Munn <dan.munn@munnster.co.uk>, Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<% html_title l(:dmsf) %>
+
+<div class="contextual">
+  <% if !@folder.new_record? && User.current.allowed_to?(:folder_manipulation, @project) && !@folder.system %>
+    <% if @folder.locked? %>
+      <%= link_to_if @folder.unlockable? && (!@folder.locked_for_user? || @force_file_unlock_allowed),
+                     sprite_icon('unlock', l(:button_unlock)),
+                     unlock_dmsf_path(id: @project, folder_id: @folder,
+                                      back_url: edit_dmsf_url(id: @project, folder_id: @folder)),
+      title: l(:title_unlock_file), class: 'icon icon-unlock' %>
+    <% else %>
+      <%= link_to sprite_icon('lock', l(:button_lock)),
+                  lock_dmsf_path(id: @project, folder_id: @folder,
+                                 back_url: edit_dmsf_url(id: @project, folder_id: @folder)),
+        title: l(:title_lock_file), class: 'icon icon-lock' %>
+    <% end %>
+    <%= actions_dropdown do %>
+      <%= render partial: 'dmsf_context_menus/folder',
+                 locals: { dmsf_folder: @folder,
+                           locked: @folder.locked?,
+                           allowed: true,
+                           dmsf_link: nil,
+                           project: @project,
+                           folder: @folder.dmsf_folder,
+                           edit: true,
+                           unlockable: @folder.unlockable? && (!@folder.locked_for_user? || User.current.allowed_to?(:force_file_unlock, @project)),
+                           email_allowed: User.current.allowed_to?(:email_documents, @project),
+                           notifications: @notifications,
+                           back_url: edit_dmsf_url(id: @project, folder_id: @folder)
+                 } %>
+    <% end %>
+  <% end %>
+</div>
+
+<% create = @pathfolder == @parent %>
+<%= render partial: 'path',
+           locals: { folder: @pathfolder, filename: create ? l(:heading_new_folder) : nil, title: nil } %>
+
+<%= labelled_form_for(@folder,
+                      url: { action: create ? 'create' : 'save', id: @project, folder_id: @folder, parent_id: @parent },
+                      html: { method: :post }) do |f| %>
+  <%= error_messages_for @folder %>
+  <%= f.hidden_field :redirect_to_folder_id, value: @redirect_to_folder_id %>
+  <div class="box tabular">    
+    <p>                
+      <%= f.text_field :title, required: true %>
+    </p>
+    <p>
+      <%= f.text_area :description, rows: 8, class: 'wiki-edit dmsf-description' %>
+    </p>
+    <p>
+      <% dir = @folder.inherited_permissions_from %>
+      <% if dir %>
+        <%= label_tag '', l(:label_inherited_permissions) %>
+        <% @project_roles.each do |role| %>
+          <% checked = dir.permission_for_role(role) %>
+          <% if checked %>
+            <label class="inline">
+              <%= check_box_tag 'inherited_permissions[role_ids][]', role.id, checked, disabled: 'disabled', id: nil %>
+              <%= role %>
+            </label>
+          <% end %>
+        <% end %>
+        <span id="inherited_user_permissions">
+          <br>
+          <% users = dir.permissions_users %>
+          <% checkboxes = users_checkboxes(users, inherited: true) %>
+          <%= checkboxes %>
+        </span>
+        <% if checkboxes.present? %>
+          <br>
+        <% end %>
+      <% end %>
+      <%= label_tag '', l(:label_dmsf_permissions) %>
+      <% @project_roles.each do |role| %>
+        <% checked = @folder.permission_for_role(role) %>
+        <label class="inline">
+          <%= check_box_tag 'permissions[role_ids][]', role.id, checked, id: nil %>
+          <%= role %>
+        </label>
+      <% end %>
+      <span id="user_permissions">
+        <br>
+        <% users = @folder.permissions_users %>
+        <% checkboxes = users_checkboxes(users) %>
+        <%= checkboxes %>
+      </span>
+        <% if checkboxes.present? %>
+        <br>
+      <% end %>
+      <span class="search_for_watchers">
+        <%= link_to sprite_icon('add', l(:label_search_for_watchers), size: 12),
+          new_dmsf_folder_permissions_path(project_id: @project, dmsf_folder_id: @folder),
+          remote: true,
+          method: :get %>
+      </span>
+    </p>
+    <% values = @folder ? @folder.custom_field_values : (@parent ? @parent.custom_field_values : DmsfFolder.new.custom_field_values) %>
+    <% values.each do |value| %>
+      <p><%= custom_field_tag_with_label :dmsf_folder, value %></p>
+    <% end %>    
+  </div>
+  <div class="form-actions">
+    <%= submit_tag create ? l(:button_create) : l(:submit_save), class: 'button-positive',
+                   data: { cy: "button__submit--dmsf_folder" } %>
+  </div>
+<% end %>
+
+<%= wikitoolbar_for 'dmsf_folder_description' %>

app/views/dmsf/edit_root.html.erb

@@ -0,0 +1,51 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Vít Jonáš <vit.jonas@gmail.com>, Daniel Munn  <dan.munn@munnster.co.uk>, Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<% html_title(l(:dmsf)) %>
+
+<div class="contextual">
+  <% if @notifications && User.current.allowed_to?(:folder_manipulation, @project) %>
+    <% if @project.dmsf_notification %>        
+      <%= link_to sprite_icon('email', l(:label_notifications_off)),
+        notify_deactivate_dmsf_path(id: @project, back_url: edit_root_dmsf_path(id: @project)),
+          title: l(:title_notifications_active_deactivate),
+          class: 'icon icon-email' %>
+    <% else %>        
+      <%= link_to sprite_icon('email-disabled', l(:label_notifications_on)),
+        notify_activate_dmsf_path(id: @project, back_url: edit_root_dmsf_path(id: @project)),
+          title: l(:title_notifications_active_deactivate),
+          class: 'icon icon-email-add' %>
+    <% end %>  
+  <% end %>
+</div>
+
+<%= render partial: 'path', locals: { folder: nil, filename: nil, title: nil } %>
+
+<%= labelled_form_for(@project, url: { action: 'save_root', id: @project }, html: { method: :post }) do |f| %>
+  <div class="box tabular">
+    <p>
+      <%= f.text_area :dmsf_description, rows: 8, class: 'wiki-edit dmsf-description', label: l(:field_description) %>
+    </p>
+    <div class="form-actions">
+      <%= f.submit l(:submit_save), class: 'button-positive' %>
+    </div>
+  </div>
+<% end %>
+
+<%= wikitoolbar_for 'project_dmsf_description' %>

app/views/dmsf/email_entries.html.erb

@@ -0,0 +1,74 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Vít Jonáš <vit.jonas@gmail.com>, Daniel Munn <dan.munn@munnster.co.uk>, Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<% html_title l(:dmsf) %>
+
+<%= render partial: 'path', locals: { folder: @folder, filename: nil, title: l(:heading_send_documents_by_email) } %>
+
+<%= form_tag(email_entries_path(id: @project, folder_id: @folder), { method: :post }) do %>
+  <%= hidden_field_tag 'email[zipped_content]', @email_params[:zipped_content] %>
+  <%= hidden_field_tag 'email[folders]', @email_params[:folders].to_json %>
+  <%= hidden_field_tag 'email[files]', @email_params[:files].to_json %>
+  <%= hidden_field_tag 'email[from]', @email_params[:from] %>
+  <%= hidden_field_tag 'email[reply_to]', @email_params[:reply_to] %>
+  <%= hidden_field_tag 'back_url', @back_url %>
+  <div class="box tabular">
+    <p>
+      <%= label_tag '', l(:label_email_from) %>
+      <%= text_field_tag 'email[from_disabled]', @email_params[:from], class: 'dmsf-full-width', disabled: true %>
+    </p>
+    <p>
+      <%= label_tag 'email[to]', l(:label_email_to) %>
+      <span>
+        <%= text_field_tag 'email[to]', @email_params[:to], class: 'dmsf-full-width', required: true %>
+        <%= link_to sprite_icon('add', l(:button_add)), add_email_dmsf_path(id: @project),
+          title: l(:label_email_address_add), class: 'icon icon-add', remote: true %>
+      </span>
+    </p>
+    <p>
+      <%= label_tag 'email[cc]', l(:label_email_cc) %>
+      <%= text_field_tag 'email[cc]', @email_params[:cc], class: 'dmsf-full-width' %>
+    </p>
+    <p>
+      <%= label_tag 'email[subject]', l(:label_email_subject) %>
+      <%= text_field_tag 'email[subject]', @email_params[:subject], class: 'dmsf-full-width' %>
+    </p>
+    <p>
+      <%= label_tag '', l(:label_email_documents) %>
+      <span>
+        <%= link_to 'Documents.zip', download_email_entries_path(id: @project, folder_id: @folder, entry: @email_params[:zipped_content]) %>
+        <%= l(:label_or) %>
+        <%= check_box_tag('email[links_only]', 1, RedmineDmsf.dmsf_documents_email_links_only?,
+              onchange: "$('#public_url').toggle($('#email_links_only').prop('checked'))")
+        %>
+        <%= l(:label_links_only) %>
+        <%= render partial: 'dmsf_public_urls/new' %>
+      </span>
+    </p>
+    <p>
+      <%= label_tag 'email[body]', l(:label_email_body) %>
+      <%= text_area_tag 'email[body]', @email_params['body'], rows: '20', class: 'dmsf-full-width wiki-edit' %>
+    </p>
+    <div class="form-actions">
+      <%= submit_tag l(:label_email_send), class: 'button-positive' %>
+    </div>
+  </div>
+<% end %>
+
+<%= wikitoolbar_for 'email_body' %>

app/views/dmsf/index.html.erb

@@ -0,0 +1,20 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Vít Jonáš <vit.jonas@gmail.com>, Daniel Munn <dan.munn@munnster.co.uk>, Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<%= render partial: 'main', locals: {} %>

app/views/dmsf/query_rows.js.erb

@@ -0,0 +1,23 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Vít Jonáš <vit.jonas@gmail.com>, Daniel Munn <dan.munn@munnster.co.uk>, Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+// Add rows
+$('#<%= params[:row_id] %>').after(
+    '<%= escape_javascript(render(partial: 'dmsf/query_rows', locals: { query: @query, dmsf_pages: nil })) %>'
+);

app/views/dmsf/save.api.rsb

@@ -0,0 +1,5 @@
+api.dmsf_folder do
+  api.id @folder.id
+  api.title @folder.title
+  api.description @folder.description
+end

app/views/dmsf/show.api.rsb

@@ -0,0 +1,28 @@
+api.dmsf do
+
+  api.array :dmsf_nodes, api_meta(total_count: @query.dmsf_nodes().count, limit: @limit, offset: @offset) do
+    @query.dmsf_nodes(offset: @offset, limit: @limit).each do |node|
+      api.node do
+        api.id node.id
+        api.title node.title
+        api.type node.type
+        case node.type
+        when 'file', 'url-link'
+            api.filename node.filename
+        when 'file-link', 'folder-link'
+            api.target_id node.revision_id.to_i
+            api.target_project_id node.project_id
+        end
+      end
+    end
+  end
+
+  if @folder
+    api.found_folder do
+      api.id @folder.id
+      api.title @folder.title
+      render_api_custom_values @folder.visible_custom_field_values, api
+    end
+  end
+
+end

app/views/dmsf/show.html.erb

@@ -0,0 +1,20 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Vít Jonáš <vit.jonas@gmail.com>, Daniel Munn <dan.munn@munnster.co.uk>, Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<%= render partial: 'main', locals: {} %>

app/views/dmsf/trash.html.erb

@@ -0,0 +1,42 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<% html_title l(:dmsf) %>
+
+<div class="contextual">
+  <% if @file_delete_allowed %>
+    <%= link_to sprite_icon('del', l(:label_empty_trash_bin)),  empty_trash_path(id: @project), method: :delete %>
+  <% end %>
+</div>
+
+<h2><%= l(:link_trash_bin) %></h2>
+
+<%= form_tag(trash_dmsf_path(id: @project), method: :get, id: 'query_form', class: 'dmsf-query-form') do %>
+  <div id="dmsf-query-form">
+    <%= render partial: 'queries/query_form' %>
+  </div>
+<% end %>
+<%= render partial: 'query_list', locals: { query: @query, dmsf_pages: @dmsf_pages } %>
+<span class="pagination"><%= pagination_links_full @dmsf_pages, @dmsf_count %></span>
+
+<%= context_menu %>
+
+<% content_for :sidebar do %>
+  <%= render partial: 'dmsf/sidebar' %>
+<% end %>

app/views/dmsf_context_menus/_approval_workflow.html.erb

@@ -0,0 +1,82 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<% workflows_available = DmsfWorkflow.where(['project_id = ? OR project_id IS NULL', project&.id]).exists? %>
+<% wf = DmsfWorkflow.find_by(id: dmsf_file.last_revision.dmsf_workflow_id) if dmsf_file.last_revision.dmsf_workflow_id %>
+<% file_approval_allowed = User.current.allowed_to?(:file_approval, project) %>
+<% allowed = User.current && (dmsf_file.last_revision.dmsf_workflow_assigned_by_user == User.current) && wf %>
+<% allowed_minor = dmsf_file.approval_allowed_zero_minor %>
+
+<% if file_approval_allowed %>
+  <% case dmsf_file.last_revision.workflow %>
+    <% when DmsfWorkflow::STATE_WAITING_FOR_APPROVAL %>
+        <% if wf %>
+          <% assignments = wf.next_assignments(dmsf_file.last_revision.id) %>
+          <% index = assignments.find_index{ |assignment| assignment.user_id == User.current.id } if assignments %>
+          <% assignment_id = (index && assignments && assignments[index]) ? assignments[index].id : nil %>
+          <% if allowed_minor %>
+            <%= context_menu_link sprite_icon('checked', l(:title_approval)),
+                                  action_dmsf_workflow_path(project_id: project.id, id: wf.id,
+                                                            dmsf_workflow_step_assignment_id: assignment_id,
+                                                            dmsf_file_revision_id: dmsf_file.last_revision.id,
+                                                            back_url: back_url),
+                                  remote: true, class: 'icon icon-ok', id: 'dmsf-cm-workflow',
+                                  disabled: !assignments || !index %>
+          <% else %>
+            <%= context_menu_link sprite_icon('checked', l(:title_approval_minor)),
+                                  action_dmsf_workflow_path(project_id: project.id, id: wf.id,
+                                                            dmsf_workflow_step_assignment_id: assignment_id,
+                                                            dmsf_file_revision_id: dmsf_file.last_revision.id,
+                                                            back_url: back_url),
+                                  remote: true, class: 'icon icon-ok', id: 'dmsf-cm-workflow', disabled: true %>
+          <% end %>
+      <% end %>
+    <% when DmsfWorkflow::STATE_ASSIGNED %>
+      <% if allowed_minor %>
+        <%= context_menu_link sprite_icon('checked', l(:title_start)),
+                              start_dmsf_workflow_path(id: dmsf_file.last_revision.dmsf_workflow_id,
+                                                       dmsf_file_revision_id: dmsf_file.last_revision.id,
+                                                       back_url: back_url),
+                              class: 'icon icon-ok', disabled: !allowed %>
+      <% else %>
+        <%= context_menu_link sprite_icon('checked', l(:title_start_minor)),
+                              start_dmsf_workflow_path(id: dmsf_file.last_revision.dmsf_workflow_id,
+                                                       dmsf_file_revision_id: dmsf_file.last_revision.id,
+                                                       back_url: back_url),
+                              class: 'icon icon-ok', disabled: true %>
+      <% end %>
+    <% when DmsfWorkflow::STATE_APPROVED, DmsfWorkflow::STATE_REJECTED, DmsfWorkflow::STATE_OBSOLETE %>
+        <%# %>
+    <% else %>
+        <% if allowed_minor %>
+            <%= context_menu_link sprite_icon('checked', l(:title_assignment)),
+                                  assign_dmsf_workflow_path(id: project.id, project_id: project.id,
+                                                            dmsf_file_revision_id: dmsf_file.last_revision.id,
+                                                            back_url: back_url),
+                                  remote: true, class: 'icon icon-ok', id: 'dmsf-cm-workflow',
+                                  disabled: locked || !workflows_available %>
+        <% else %>
+            <%= context_menu_link sprite_icon('checked', l(:title_assignment_minor)),
+                                  assign_dmsf_workflow_path(id: project.id, project_id: project.id,
+                                                            dmsf_file_revision_id: dmsf_file.last_revision.id,
+                                                            back_url: back_url),
+                                  remote: true, class: 'icon icon-ok', id: 'dmsf-cm-workflow', disabled: true %>
+        <% end %>
+    <% end %>
+<% end %>

app/views/dmsf_context_menus/_file.html.erb

@@ -0,0 +1,116 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<li>
+  <%= context_menu_link sprite_icon('edit', l(:button_edit)), dmsf_file_path(id: dmsf_file, back_url: back_url),
+                        class: 'icon icon-edit', data: { cy: "icon__edit--dmsf_file_#{dmsf_file.id}" },
+                        disabled: !allowed || (locked && !unlockable) %>
+</li>
+<% unless dmsf_link %>
+  <li>
+    <%= context_menu_link sprite_icon('copy', "#{l(:button_copy)}/#{l(:button_move)}"),
+                          copymove_entries_path(id: project, folder_id: folder, ids: ["file-#{dmsf_file.id}"],
+                                                back_url: back_url), title: l(:title_copy), class: 'icon icon-copy',
+                          data: { cy: "icon__copy--dmsf_file_#{dmsf_file.id}" } %>
+  </li>
+  <li>
+    <%= link_to sprite_icon('link', l(:label_link_to)),
+                new_dmsf_link_path(project_id: dmsf_file.project.id, dmsf_folder_id: dmsf_file.dmsf_folder,
+                                 dmsf_file_id: dmsf_file.id, type: 'link_to', back_url: back_url),
+                title: l(:title_create_link), class: 'icon dmsf-icon-link',
+                data: { cy: "icon__link_to--dmsf_file_#{dmsf_file.id}" } %>
+  </li>
+<% end %>
+<li>
+    <% if locked %>
+      <%= context_menu_link sprite_icon('unlock', l(:button_unlock)), unlock_dmsf_files_path(id: dmsf_file, back_url: back_url),
+            class: 'icon icon-unlock', data: { cy: "icon__unlock--dmsf_file_#{dmsf_file.id}" },
+            title: l(:title_locked_by_user, user: dmsf_file.locked_by), disabled: !unlockable %>
+    <% else %>
+      <%= context_menu_link sprite_icon('lock', l(:button_lock)), lock_dmsf_files_path(id: dmsf_file, back_url: back_url),
+            class: 'icon icon-lock', data: { cy: "icon__lock--dmsf_file_#{dmsf_file.id}" }, disabled: !allowed %>
+    <% end %>
+</li>
+<% if notifications %>
+  <li>
+    <% if dmsf_file.notification %>
+        <%= context_menu_link sprite_icon('email', l(:label_notifications_off)),
+                              notify_deactivate_dmsf_files_path(id: dmsf_file, back_url: back_url),
+                              class: 'icon icon-email', data: { cy: "icon__email--dmsf_file_#{dmsf_file.id}" },
+                              disabled: !allowed || locked %>
+    <% else %>
+        <%= context_menu_link sprite_icon('email-disabled', l(:label_notifications_on)),
+                              notify_activate_dmsf_files_path(id: dmsf_file, back_url: back_url),
+                              class: 'icon icon-email-add',
+                              data: { cy: "icon__email_add--dmsf_file_#{dmsf_file.id}" },
+                              disabled: !allowed || locked %>
+    <% end %>
+  </li>
+<% end %>
+<li>
+    <%= render partial: 'approval_workflow', locals: { dmsf_file: dmsf_file, project: project, locked: locked,
+          back_url: back_url } %>
+</li>
+<li>
+  <% member = Member.find_by(user_id: User.current.id, project_id: dmsf_file.project.id) %>
+  <% filename = dmsf_file.last_revision&.formatted_name(member) %>
+  <%= context_menu_link sprite_icon('download', l(:button_download)),
+                        static_dmsf_file_path(dmsf_file, filename: filename),
+                        class: 'icon icon-download', data: { cy: "icon__download--dmsf_file_#{dmsf_file.id}" },
+                        disabled: false %>
+</li>
+<li>
+<%= context_menu_link sprite_icon('email', l(:field_mail)),
+                      entries_operations_dmsf_path(id: project, folder_id: folder, ids: params[:ids],
+                                                   email_entries: true, back_url: back_url),
+                      method: :post, class: 'icon icon-email',
+                      data: { cy: "icon__email--dmsf_file_#{dmsf_file.id}" }, disabled: !email_allowed %>
+</li>
+<% if RedmineDmsf.dmsf_webdav? %>
+  <li>
+    <% if dmsf_file.last_revision && dmsf_file.last_revision.protocol %>
+      <% url = "#{dmsf_file.last_revision.protocol}:ofe|u|#{Setting.protocol.strip}://#{Setting.host_name.strip}/dmsf/webdav/#{Addressable::URI.escape(RedmineDmsf::Webdav::ProjectResource.create_project_name(dmsf_file.project))}/" %>
+      <% if dmsf_file.dmsf_folder %>
+        <% url << "#{dmsf_file.dmsf_folder.dmsf_path_str}/" %>
+      <% end %>
+      <% url << dmsf_file.name %>
+    <% end %>
+    <% icon_name = icon_for_mime_type(Redmine::MimeType.css_class_of(dmsf_file.name)) %>
+    <%= context_menu_link sprite_icon(icon_name, l(:button_edit_content)), url, class: 'icon icon-file',
+                          disabled: url.blank? || (locked && !unlockable) ||
+                            (Setting.plugin_redmine_dmsf['dmsf_webdav_strategy'] != 'WEBDAV_READ_WRITE') %>
+  </li>
+<% end %>
+<li>
+  <%= render partial: 'dmsf_context_menus/watch', locals: { object: dmsf_file } %>
+</li>
+<% if @preview %>
+  <li>
+    <%= context_menu_link sprite_icon('zoom-in', l(:label_preview)), view_dmsf_file_path(dmsf_file, preview: true),
+                          class: 'icon icon-zoom-in', disabled: false %>
+  </li>
+<% end %>
+<li>
+  <%= context_menu_link sprite_icon('del', l(:button_delete)),
+        dmsf_link ? dmsf_link_path(id: dmsf_link, folder_id: folder, back_url: back_url) : dmsf_file_path(id: dmsf_file,
+          folder_id: folder, back_url: back_url),
+        method: :delete, class: 'icon icon-del', data: { confirm: l(:text_are_you_sure),
+        cy: "icon__delete--dmsf_file_#{dmsf_file.id}" }, id: 'dmsf-cm-delete',
+        disabled: !allowed || (locked && !dmsf_link) %>
+</li>

app/views/dmsf_context_menus/_file_trash.html.erb

@@ -0,0 +1,30 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<li>
+  <%= context_menu_link sprite_icon('reload', l(:title_restore)),
+                        dmsf_link ? restore_dmsf_link_path(id: dmsf_link) : restore_dmsf_file_path(id: dmsf_file),
+                        class: 'icon icon-cancel', disabled: !allowed_restore %>
+</li>
+<li>
+  <%= context_menu_link sprite_icon('del', l(:button_delete)),
+                        dmsf_link ? dmsf_link_path(id: dmsf_link, commit: 'yes') : dmsf_file_path(id: dmsf_file, commit: 'yes'),
+                        data: { confirm: l(:text_are_you_sure) }, method: :delete, class: 'icon icon-del',
+                        id: 'dmsf-cm-delete', disabled: !allowed_delete %>
+</li>

app/views/dmsf_context_menus/_folder.html.erb

@@ -0,0 +1,104 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<% unless edit %>
+  <li>
+    <%= context_menu_link sprite_icon('edit', l(:button_edit)),
+                          edit_dmsf_path(id: dmsf_folder.project, folder_id: dmsf_folder, back_url: back_url),
+                          class: 'icon icon-edit', data: { cy: "icon__edit--dmsf_folder_#{dmsf_folder.id}" },
+          disabled: !allowed || locked %>
+  </li>
+<% end %>
+<% unless dmsf_link %>
+  <li>
+    <%= context_menu_link sprite_icon('copy', "#{l(:button_copy)}/#{l(:button_move)}"),
+                          copymove_entries_path(id: project, folder_id: folder, ids: ["folder-#{dmsf_folder.id}"],
+                                                back_url: back_url), class: 'icon icon-copy',
+                                                data: { cy: "icon__copy--dmsf_folder_#{dmsf_folder.id}" },
+                          disabled: !allowed || locked %>
+  </li>
+  <li>
+    <%= context_menu_link sprite_icon('link', l(:label_link_to)),
+          new_dmsf_link_path(project_id: project.id, dmsf_folder_id: dmsf_folder.id, type: 'link_to',
+                             back_url: back_url), class: 'icon dmsf-icon-link',
+                             data: { cy: "icon__link_to--dmsf_folder_#{dmsf_folder.id}" } %>
+  </li>
+<% end %>
+<% unless edit %>
+  <li>
+    <% if locked %>
+      <%= context_menu_link sprite_icon('unlock', l(:button_unlock)),
+                            unlock_dmsf_path(id: dmsf_folder.project, folder_id: dmsf_folder, back_url: back_url),
+                            title: l(:title_locked_by_user, user: dmsf_folder.locked_by), class: 'icon icon-unlock',
+                            data: { cy: "icon__unlock--dmsf_folder_#{dmsf_folder.id}" },
+                            disabled: !allowed || !unlockable %>
+    <% else %>
+      <%= context_menu_link sprite_icon('lock', l(:button_lock)),
+                            lock_dmsf_path(id: dmsf_folder.project, folder_id: dmsf_folder, back_url: back_url),
+                            class: 'icon icon-lock', data: { cy: "icon__lock--dmsf_folder_#{dmsf_folder.id}" },
+                            disabled: !allowed %>
+      <% end %>
+  </li>
+<% end %>
+<% if notifications %>
+  <li>
+    <% if dmsf_folder.notification %>
+      <%= context_menu_link sprite_icon('email', l(:label_notifications_off)),
+                            notify_deactivate_dmsf_path(id: dmsf_folder.project, folder_id: dmsf_folder,
+                                                        back_url: back_url), class: 'icon icon-email',
+                                                        data: { cy: "icon__email--dmsf_folder_#{dmsf_folder.id}" },
+                            disabled: !allowed || locked || !dmsf_folder.notification? %>
+    <% else %>
+      <%= context_menu_link sprite_icon('email-disabled', l(:label_notifications_on)),
+                            notify_activate_dmsf_path(id: dmsf_folder.project, folder_id: dmsf_folder,
+                                                      back_url: back_url), class: 'icon icon-email-add',
+                                                      data: { cy: "icon__email_add--dmsf_folder_#{dmsf_folder.id}" },
+                            disabled: !allowed || locked || dmsf_folder.notification? %>
+    <% end %>
+  </li>
+<% end %>
+<% unless edit %>
+  <li>
+    <%= context_menu_link sprite_icon('download', l(:button_download)),
+                          entries_operations_dmsf_path(id: project, folder_id: folder, ids: params[:ids],
+                                                       download_entries: true, back_url: back_url),
+                          method: :post, class: 'icon icon-download',
+                          data: { cy: "icon__download--dmsf_folder_#{dmsf_folder.id}" },
+      id: 'dmsf-cm-download', disabled: false %>
+  </li>
+  <li>
+    <%= context_menu_link sprite_icon('email', l(:field_mail)),
+                          entries_operations_dmsf_path(id: dmsf_folder.project, folder_id: folder, ids: params[:ids],
+                                                       email_entries: true, back_url: back_url),
+                          method: :post, class: 'icon icon-email',
+                          data: { cy: "icon__email--dmsf_folder_#{dmsf_folder.id}" },
+      disabled: !email_allowed %>
+  </li>
+<% end %>
+<li>
+  <%= render partial: 'dmsf_context_menus/watch', locals: { object: dmsf_folder } %>
+</li>
+<li>
+  <%= context_menu_link sprite_icon('del', l(:button_delete)),
+    dmsf_link ? dmsf_link_path(id: dmsf_link, folder_id: folder, back_url: back_url) :
+    delete_dmsf_path(id: dmsf_folder.project, folder_id: dmsf_folder, parent_id: folder, back_url: back_url),
+    data: { confirm: "#{l(:text_are_you_sure)}\n#{l(:text_not_empty) unless dmsf_folder.empty?}",
+            cy: "icon__delete--dmsf_folder_#{dmsf_folder.id}" }, method: :delete,
+    class: 'icon icon-del', id: 'dmsf-cm-delete', disabled: !allowed || (locked && !dmsf_link) %>
+</li>

app/views/dmsf_context_menus/_folder_trash.html.erb

@@ -0,0 +1,30 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<li>
+  <%= context_menu_link sprite_icon('reload', l(:title_restore)),
+                        dmsf_link ? restore_dmsf_link_path(id: dmsf_link) : restore_dmsf_path(id: project, folder_id: dmsf_folder),
+                        class: 'icon icon-cancel', disabled: !allowed_restore %>
+</li>
+<li>
+  <%= context_menu_link sprite_icon('del', l(:button_delete)),
+                        dmsf_link ? dmsf_link_path(id: dmsf_link, commit: 'yes') : delete_dmsf_path(id: project, folder_id: dmsf_folder, commit: 'yes'),
+                        data: { confirm: l(:text_are_you_sure) }, method: :delete, class: 'icon icon-del',
+                        id: 'dmsf-cm-delete', disabled: !allowed_delete %>
+</li>

app/views/dmsf_context_menus/_main.html.erb

@@ -0,0 +1,86 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<% if folder_manipulation_allowed && !system_folder %>
+  <% if folder.nil? %>
+    <%= link_to sprite_icon('edit', l(:button_edit)),
+                edit_root_dmsf_path(id: project),
+                title: l(:link_edit, title: l(:link_documents)),
+                class: 'icon icon-edit',
+                data: { cy: 'button__edit--dmsf' } %>
+  <% elsif !locked %>
+    <%= link_to sprite_icon('edit', l(:button_edit)),
+                edit_dmsf_path(id: project, folder_id: folder, redirect_to_folder_id: folder.id),
+                title: l(:link_edit, title: h(folder.title)),
+                class: 'icon icon-edit',
+                data: { cy: 'button__edit--dmsf' } %>
+  <% end %>
+  <% if folder && (!locked || User.current.allowed_to?(:force_file_unlock, project)) %>
+    <% if folder.locked? %>
+      <%= link_to_if folder.unlockable?,
+                     sprite_icon('unlock', l(:button_unlock)),
+                     unlock_dmsf_path(id: project, folder_id: folder, current: request.url),
+                     title: l(:title_unlock_folder),
+                     class: 'icon icon-unlock',
+                     data: { cy: 'button__unlock--dmsf' } %>
+    <% else %>
+      <%= link_to sprite_icon('lock', l(:button_lock)),
+                  lock_dmsf_path(id: project, folder_id: folder, current: request.url),
+                  title: l(:title_lock_folder), class: 'icon icon-lock',
+                  data: { cy: 'button__lock--dmsf' } %>
+    <% end %>
+  <% end %>
+  <% if notifications && !locked %>
+    <% if ((folder && folder.notification) || (!folder && project.dmsf_notification)) %>
+      <%= link_to sprite_icon('email', l(:label_notifications_off)),
+                  notify_deactivate_dmsf_path(id: project, folder_id: folder),
+                  title: l(:title_notifications_active_deactivate),
+                  class: 'icon icon-email',
+                  data: { cy: 'button__notifications-off--dmsf' } %>
+    <% else %>
+      <%= link_to sprite_icon('email-disabled', l(:label_notifications_on)),
+                  notify_activate_dmsf_path(id: project, folder_id: folder),
+                  title: l(:title_notifications_not_active_activate),
+                  class: 'icon icon-email-add',
+                  data: { cy: 'button__notifications-on--dmsf' } %>
+    <% end %>
+  <% end %>
+  <% if file_manipulation_allowed && !locked %>
+    <%= link_to sprite_icon('link', l(:label_link_from)),
+                new_dmsf_link_path(project_id: project.id, dmsf_folder_id: folder ? folder.id : folder,
+                                   type: 'link_from'),
+                title: l(:title_create_link),
+                class: 'icon dmsf-icon-link',
+                data: { cy: 'button__create-link--dmsf' } %>
+  <% end %>
+<% end %>
+<%= render partial: 'dmsf_context_menus/watch', locals: { object: folder ? folder : project } %>
+<% if trash_enabled %>
+  <%= link_to sprite_icon('del', l(:link_trash_bin)),
+              trash_dmsf_path(project),
+              title: l(:link_trash_bin),
+              class: 'icon icon-del',
+              data: { cy: 'button__trash--dmsf' } %>
+<% else %>
+  <span class="icon icon-del">
+      <%= sprite_icon('del', l(:link_trash_bin)) %>
+  </span>
+<% end %>
+<%= link_to sprite_icon('help', l(:label_help)), dmsf_help_path, class: 'icon icon-help',
+            onclick: "window.open('#{dmsf_help_url}','_blank', 'width=640,height=960'); return false;" %>

app/views/dmsf_context_menus/_multiple.html.erb

@@ -0,0 +1,43 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<li>
+  <%= context_menu_link sprite_icon('download', l(:button_download)),
+                        entries_operations_dmsf_path(id: project, folder_id: folder, ids: params[:ids],
+                                                     download_entries: true),
+                        method: :post, class: 'icon icon-download', disabled: project.nil? %>
+</li>
+<li>
+  <%= context_menu_link sprite_icon('email', l(:field_mail)),
+                        entries_operations_dmsf_path(id: project, folder_id: folder, ids: params[:ids],
+                                                     email_entries: true),
+                        method: :post, class: 'icon icon-email', disabled: !email_allowed %>
+</li>
+<li>
+  <%= context_menu_link sprite_icon('copy', "#{l(:button_copy)}/#{l(:button_move)}"),
+                        copymove_entries_path(id: project, folder_id: folder, ids: params[:ids], back_url: back_url),
+                        class: 'icon icon-copy', disabled: project.nil? %>
+</li>
+<li>
+  <%= context_menu_link sprite_icon('del', l(:button_delete)),
+                        entries_operations_dmsf_path(id: project, folder_id: folder, ids: params[:ids],
+                                                     delete_entries: true),
+                        method: :post, class: 'icon icon-del', data: { confirm: l(:text_are_you_sure) },
+                        id: 'dmsf-cm-delete', disabled: !allowed %>
+</li>

app/views/dmsf_context_menus/_multiple_trash.html.erb

@@ -0,0 +1,32 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<li>
+  <%= context_menu_link sprite_icon('reload', l(:title_restore)),
+                        entries_operations_dmsf_path(id: project, folder_id: folder, ids: params[:ids],
+                                                     restore_entries: true),
+                        method: :post, class: 'icon icon-cancel', disabled: !allowed_restore %>
+</li>
+<li>
+  <%= context_menu_link sprite_icon('del', l(:button_delete)),
+                        entries_operations_dmsf_path(id: project, folder_id: folder, ids: params[:ids],
+                                                     destroy_entries: true),
+                        method: :post, class: 'icon icon-del', data: { confirm: l(:text_are_you_sure) },
+                        id: 'dmsf-cm-delete', disabled: !allowed_delete %>
+</li>

app/views/dmsf_context_menus/_project.html.erb

@@ -0,0 +1,22 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<li>
+  <%= render partial: 'dmsf_context_menus/watch', locals: { object: dmsf_project } %>
+</li>

app/views/dmsf_context_menus/_revision_actions.html.erb

@@ -0,0 +1,37 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<%= link_to_function sprite_icon('group', l(:title_download_entries)),
+                     "$('#revision_access_#{revision.id}').toggle(); $('.drdn.expanded').removeClass('expanded');",
+                     class: 'icon icon-group dmsf-revision-action-button' %>
+<% member = Member.find_by(user_id: User.current.id, project_id: revision.dmsf_file.project.id) %>
+<% filename = revision.formatted_name(member) %>
+<%= link_to sprite_icon('download', l(:button_download)),
+            static_dmsf_file_path(file, download: revision, filename: filename),
+            class: 'icon icon-download', disabled: false %>
+<%= link_to sprite_icon('close', l(:title_obsolete_revision)),
+            obsolete_revision_path(revision),
+            data: { confirm: l(:text_are_you_sure) },
+            class: 'icon icon-close dmsf-revision-action-button' if file_manipulation_allowed && (revision.workflow == DmsfWorkflow::STATE_APPROVED) %>
+<% if file_delete_allowed && (file.dmsf_file_revisions.visible.count > 1) %>
+  <%= delete_link delete_revision_path(revision),
+                  { data: { confirm: l(:text_are_you_sure) },
+                    title: l(:title_delete_revision),
+                    class: 'icon icon-del dmsf-revision-action-button' } %>
+<% end %>

app/views/dmsf_context_menus/_revisions.html.erb

@@ -0,0 +1,46 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<% if notifications %>
+  <% if file.notification %>
+    <%= link_to sprite_icon('email', l(:label_notifications_off)),
+                notify_deactivate_dmsf_files_path(id: file, back_url: back_url),
+                title: l(:title_notifications_active_deactivate),
+                class: 'icon icon-email' %>
+  <% else %>
+    <%= link_to sprite_icon('email-disabled', l(:label_notifications_on)),
+                notify_activate_dmsf_files_path(id: file, back_url: back_url),
+                title: l(:title_notifications_not_active_activate),
+                class: 'icon icon-email-add' %>
+  <% end %>
+<% end %>
+<%= link_to sprite_icon('link', l(:label_link_to)),
+            new_dmsf_link_path(project_id: project.id, dmsf_folder_id: file.dmsf_folder ? file.dmsf_folder.id : nil,
+                               dmsf_file_id: file.id, type: 'link_to', back_url: back_url),
+            title: l(:title_create_link), class: 'icon dmsf-icon-link' %>
+<%= context_menu_link sprite_icon('copy', "#{l(:button_copy)}/#{l(:button_move)}"),
+                      copymove_entries_path(id: project, folder_id: file.dmsf_folder, ids: ["file-#{file.id}"],
+                                            back_url: back_url), class: 'icon icon-copy' %>
+<% member = Member.find_by(user_id: User.current.id, project_id: file.project.id) %>
+<% filename = file.last_revision&.formatted_name(member) %>
+<%= link_to sprite_icon('download', l(:button_download)),
+            static_dmsf_file_path(file, filename: filename), class: 'icon icon-download', disabled: false %>
+<%= render partial: 'dmsf_context_menus/watch', locals: { object: file } %>
+<%= delete_link(dmsf_file_path(id: file, details: true),
+                back_url: dmsf_folder_path(id: file.project, folder_id: file.dmsf_folder)) if file_delete_allowed %>

app/views/dmsf_context_menus/_url.html.erb

@@ -0,0 +1,24 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<li>
+  <%= context_menu_link sprite_icon('del', l(:button_delete)), dmsf_link_path(dmsf_link), method: :delete,
+                        class: 'icon icon-del', data: { confirm: l(:text_are_you_sure) }, id: 'dmsf-cm-delete',
+                        disabled: !allowed %>
+</li>

app/views/dmsf_context_menus/_watch.html.erb

@@ -0,0 +1,26 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<% watched = object.watched_by?(User.current) %>
+<% css = [watcher_css([object]), watched ? 'icon icon-fav' : 'icon icon-fav-off'].join(' ') %>
+<% icon = watched ? 'unwatch' : 'watch' %>
+<% text = watched ? l(:button_unwatch) : l(:button_watch) %>
+<% url = watch_path(object_type: object.class.to_s.underscore, object_id: object.id) %>
+<% method = watched ? 'delete' : 'post' %>
+<%= context_menu_link sprite_icon(icon, text), url, method: method, class: css, disabled: !User.current.logged? %>

app/views/dmsf_context_menus/dmsf.html.erb

@@ -0,0 +1,48 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<ul>
+  <% if @dmsf_file %>
+    <%= render partial: 'file', locals: { project: @project, folder: @folder, dmsf_file: @dmsf_file,
+                                          dmsf_link: @dmsf_link, locked: @locked, unlockable: @unlockable,
+                                          allowed: @allowed, email_allowed: @email_allowed,
+                                          notifications: @notifications, preview: @preview, back_url: @back_url } %>
+  <% elsif @dmsf_folder %>
+    <%= render partial: 'folder', locals: { project: @project, folder: @folder, dmsf_folder: @dmsf_folder,
+                                            dmsf_link: @dmsf_link, locked: @locked, unlockable: @unlockable,
+                                            allowed: @allowed, email_allowed: @email_allowed, edit: false,
+                                            notifications: @notifications, back_url: @back_url } %>
+  <% elsif @dmsf_link %>
+    <%= render partial: 'url', locals: { dmsf_link: @dmsf_link, allowed: @allowed, back_url: @back_url } %>
+  <% elsif @dmsf_project %>
+    <%= render partial: 'project', locals: { dmsf_project: @dmsf_project, allowed: @allowed, back_url: @back_url } %>
+  <% else %>
+    <%= render partial: 'multiple', locals: { project: @project, folder: @folder, allowed: @allowed,
+                                              email_allowed: @email_allowed, back_url: @back_url } %>
+  <% end %>
+</ul>
+
+<%= javascript_tag do %>
+  $('#dmsf-cm-delete').click(function (event) {
+    $('#context-menu').hide();
+  });
+  $('#dmsf-cm-workflow').click(function (event) {
+    $('#context-menu').hide();
+  });
+<% end %>

app/views/dmsf_context_menus/trash.html.erb

@@ -0,0 +1,38 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<ul>
+  <% if @dmsf_file || @dmsf_link %>
+    <%= render(partial: 'file_trash', locals: { project: @project, folder: @folder, dmsf_file: @dmsf_file,
+                                                dmsf_link: @dmsf_link, allowed_delete: @allowed_delete,
+                                                allowed_restore: @allowed_restore }) %>
+  <% elsif @dmsf_folder %>
+    <%= render(partial: 'folder_trash', locals: { project: @project, folder: @folder, dmsf_folder: @dmsf_folder,
+                                                  dmsf_link: @dmsf_link, allowed_delete: @allowed_delete,
+                                                  allowed_restore: @allowed_restore }) %>
+  <% else %>
+    <%= render(partial: 'multiple_trash', locals: { project: @project, folder: @folder, allowed_delete: @allowed_delete,
+                                                    allowed_restore: @allowed_restore }) %>
+  <% end %>
+</ul>
+<%= javascript_tag do %>
+  $('#dmsf-cm-delete').click(function (event) {
+    $('#context-menu').hide();
+  });
+<% end %>

app/views/dmsf_files/_file_new_revision.html.erb

@@ -0,0 +1,85 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Vít Jonáš <vit.jonas@gmail.com>, Daniel Munn <dan.munn@munnster.co.uk>, Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<div id="dmsf_new_revision" class="box tabular">
+    <strong><%= l(:heading_new_revision) %>
+      <a href="#" id="new_revision_form_content_toggle" data-cy="toggle__new_revision_from_content--dmsf">[+]</a>
+    </strong>
+  <div id="new_revision_form_content">
+    <% if @file.locked_for_user? %>
+      <p class="warning"><%= l(:info_file_locked) %></p>
+    <% else %>
+      <%= labelled_form_for(@revision, url: { action: 'create_revision', id: @file },
+            html: { method: :post, multipart: true, id: 'new_revision_form' }) do |f| %>
+        <%= hidden_field_tag 'back_url', params[:back_url] %>
+        <div class="splitcontent">
+          <div class="splitcontentleft">
+            <p>
+              <%= f.text_field(:title) %>
+            </p>
+          </div>
+          <div class="splitcontentright">
+            <p>
+              <%= f.text_field :name, label: l(:label_file) %>
+            </p>
+          </div>
+        </div>
+        <p>
+          <%= f.text_area :description, rows: 6, class: 'wiki-edit dmsf-description' %>
+        </p>
+        <div class="splitcontent">
+          <div class="splitcontentleft">
+            <p>
+              <%= render partial: 'dmsf_files/version_selector', locals: {
+                label_tag_name: 'version',
+                select_tag_name_patch: 'version_patch',
+                select_tag_name_minor: 'version_minor',
+                select_tag_name_major: 'version_major',
+                revision_or_upload: @file.last_revision } %>
+            </p>
+          </div>
+          <div class="splitcontentright">
+            <div class="custom_fields">
+              <% @revision.custom_field_values.each do |value| %>
+                <% value.value = nil if value.custom_field.dmsf_not_inheritable %>
+                <p><%= custom_field_tag_with_label(:dmsf_file_revision, value) %></p>
+              <% end %>
+            </div>
+          </div>
+        </div>
+        <p>
+          <%= label_tag 'file_upload', l(:label_new_content) %>
+          <span class="dmsf-uploader">
+            <%= render partial: 'dmsf_upload/form',
+                     locals: { multiple: false, container: nil, awf: false } %>
+          </span>
+        </p>
+        <p>
+          <%= f.text_area :comment, rows: 2, label: l(:label_comment), class: 'wiki-edit dmsf-description' %>
+        </p>
+        <div class="form-actions">
+          <%= f.submit l(:button_create), class: 'button-positive', data: { cy: "button__submit--file_dmsf"} %>
+        </div>
+      <% end %>
+    <% end %>
+  </div>
+</div>
+
+<%= wikitoolbar_for 'dmsf_file_revision_description' %>
+<%= wikitoolbar_for 'dmsf_file_revision_comment' %>

app/views/dmsf_files/_link.html.erb

@@ -0,0 +1,104 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<% cls = link ? 'dmsf-gray' : '' %>
+
+<td class="<%= cls %>">
+  <% file_view_url = url_for({ controller: :dmsf_files, action: 'view', id: dmsf_file }) %>
+  <% icon_name = icon_for_mime_type(Redmine::MimeType.css_class_of(dmsf_file.name)) %>
+  <%= link_to sprite_icon(icon_name, h(link ? link.name : dmsf_file.title)),
+    file_view_url,
+    target: '_blank',
+    rel: 'noopener',
+    title: h(dmsf_file.last_revision.try(:tooltip)),
+    'data-downloadurl' => "#{dmsf_file.last_revision.detect_content_type}:#{h(dmsf_file.name)}:#{file_view_url}" %>
+</td>
+<td class="<%= cls %>">
+  <span class="size">(<%= number_to_human_size dmsf_file.last_revision.size %>)</span>
+  <%= link_to '', view_dmsf_file_url(dmsf_file, download: dmsf_file.last_revision, disposition: 'attachment'),
+        title: l(:title_title_version_version_download, title: h(dmsf_file.last_revision.title),
+        version: dmsf_file.last_revision.version), class: 'icon icon-download dmsf-revision-action-button' %>
+</td>
+<td class="<%= cls %>">
+  <%= dmsf_file.description unless dmsf_file.description.blank? %>
+</td>
+<td class="<%= cls %>">
+  <span class="author"><%= dmsf_file.last_revision.user %>, <%= format_time(dmsf_file.last_revision.updated_at) %></span>
+</td>
+<% # Command icons %>
+<td class="<%= cls %>">
+  <span class="dmsf_upload_select">
+    <% # Details %>
+    <% if User.current.allowed_to? :file_manipulation, dmsf_file.project %>
+      <%= link_to sprite_icon('edit', ''), dmsf_file_path(id: dmsf_file, back_url: issue_path(@issue)),
+        title: l(:link_details, title: h(dmsf_file.last_revision.title)),
+        class: 'icon-only icon-edit' %>
+    <% else %>
+      <span class="icon-only"></span>
+    <% end %>
+    <% # Email %>
+    <%= link_to sprite_icon('email', ''), entries_operations_dmsf_path(id: dmsf_file.project_id, email_entries: 'email',
+                                                                       ids: ["file-#{dmsf_file.id}"],
+                                                                       back_url: issue_path(@issue)),
+                method: :post, title: l(:heading_send_documents_by_email), class: 'icon-only icon-email-disabled' %>
+    <% # Lock %>
+    <% if !dmsf_file.locked? %>
+      <%= link_to sprite_icon('lock', ''), lock_dmsf_files_path(id: dmsf_file, back_url: issue_path(@issue)),
+                  title: l(:title_lock_file), class: 'icon-only icon-lock' %>
+    <% elsif dmsf_file.unlockable? && (!dmsf_file.locked_for_user? || User.current.allowed_to?(:force_file_unlock, dmsf_file.project)) %>
+      <%= link_to sprite_icon('unlock', ''), unlock_dmsf_files_path(id: dmsf_file, back_url: issue_path(@issue)),
+                  title: dmsf_file.locked_title, class: 'icon-only icon-unlock' %>
+    <% else %>
+      <%= content_tag('span', sprite_icon('unlock', ''), title: dmsf_file.locked_title) %>
+    <% end %>
+    <% if !dmsf_file.locked? %>
+      <% # Notifications %>
+      <% if dmsf_file.notification %>
+        <%= link_to sprite_icon('email', ''), notify_deactivate_dmsf_files_path(id: dmsf_file,
+                                                                                back_url: issue_path(@issue)),
+                    title: l(:title_notifications_active_deactivate), class: 'icon-only icon-email' %>
+      <% else %>
+        <%= link_to sprite_icon('email-disabled', ''), notify_activate_dmsf_files_path(id: dmsf_file,
+                                                                                       back_url: issue_path(@issue)),
+                    title: l(:title_notifications_not_active_activate), class: 'icon-only icon-email-add' %>
+      <% end %>
+    <% else %>
+      <span class="icon-only"></span>
+      <span class="icon-only"></span>
+    <% end %>
+    <% # Delete %>
+    <% if @issue.attributes_editable? &&
+       ((link && User.current.allowed_to?(:file_manipulation, dmsf_file.project)) ||
+         (!link && User.current.allowed_to?(:file_delete, dmsf_file.project))) %>
+      <% url = if link
+                 dmsf_link_path(link, commit: 'yes', back_url: issue_path(@issue))
+               else
+                 dmsf_file_path(id: dmsf_file, commit: 'yes', back_url: issue_path(@issue))
+               end %>
+      <%= delete_link url, {}, '' %>
+    <% end %>
+    <% # Approval workflow %>
+    <% wf = DmsfWorkflow.find_by(id: dmsf_file.last_revision.dmsf_workflow_id) if dmsf_file.last_revision.dmsf_workflow_id %>
+    <%= render partial: 'dmsf_workflows/approval_workflow_button',
+      locals: { file: dmsf_file,
+         file_approval_allowed: User.current.allowed_to?(:file_approval, dmsf_file.project),
+         workflows_available: DmsfWorkflow.where(['project_id = ? OR project_id IS NULL', dmsf_file.project_id]).exists?,
+         project: dmsf_file.project, wf: wf, dmsf_link_id: nil, back_url: issue_path(@issue) } %>
+  </span>
+</td>

app/views/dmsf_files/_links.html.erb

@@ -0,0 +1,36 @@
+<%
+  # Redmine plugin for Document Management System "Features"
+  #
+  # Karel Pičman <karel.picman@kontron.com>
+  #
+  # This file is part of Redmine DMSF plugin.
+  #
+  # Redmine DMSF plugin is free software: you can redistribute it and/or modify it under the terms of the GNU General
+  # Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
+  # later version.
+  #
+  # Redmine DMSF plugin is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+  # the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  # more details.
+  #
+  # You should have received a copy of the GNU General Public License along with Redmine DMSF plugin. If not, see
+  # <https://www.gnu.org/licenses/>.
+%>
+
+<% if links.present? %>
+  <hr>
+  <p>
+    <strong><%= l(:menu_dmsf) %></strong>
+  </p>
+  <div class="attachments dmsf-parent-container">
+    <% # DMS documents & links %>
+    <table>
+        <% links.each do |dmsf_file, link, _| %>
+        <tr>
+          <%= render partial: 'dmsf_files/link', locals: { dmsf_file: dmsf_file, link: link } %>
+        </tr>
+        <% end %>
+    </table>
+    <%= render partial: 'dmsf_files/thumbnails', locals: { links: links, thumbnails: thumbnails, link_to: true } %>
+  </div>
+<% end %>