# 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/>.

module RedmineDmsf
  module Webdav
    # Replacement for Rack::Auth::Digest
    class DmsfDigest
      def initialize(authorization)
        @authorization = authorization
      end

      def params
        params = {}
        parts = @authorization.split(' ', 2)
        split_header_value(parts[1]).each do |param|
          k, v = param.split('=', 2)
          params[k] = dequote(v)
        end
        params
      end

      private

      def dequote(str)
        ret = /\A"(.*)"\Z/ =~ str ? ::Regexp.last_match(1) : str.dup
        ret.gsub(/\\(.)/, '\\1')
      end

      def split_header_value(str)
        str.scan(/(\w+=(?:"[^"]+"|[^,]+))/n).pluck(0)
      end
    end
  end
end
