Feat: Add password change feature and update initial account security

client/src/App.tsx

@@ -1,6 +1,6 @@
 import { useState, useEffect, useMemo } from 'react';
 import axios from 'axios';
-import { Key, Plus, Copy, CheckCircle, Clock, Search, Users, ChevronRight, ArrowLeft, Trash2, LogOut } from 'lucide-react';
+import { Key, Plus, Copy, CheckCircle, Clock, Search, Users, ChevronRight, ArrowLeft, Trash2, LogOut, X, Loader2, Lock } from 'lucide-react';
 import Login from './components/Login';
 
 // Axios settings for cookies
@@ -24,6 +24,13 @@ const App = () => {
   const [user, setUser] = useState<any>(null);
   const [authChecked, setAuthChecked] = useState(false);
   const [licenses, setLicenses] = useState<License[]>([]);
+  const [showPasswordModal, setShowPasswordModal] = useState(false);
+  const [passwordForm, setPasswordForm] = useState({
+    currentPassword: '',
+    newPassword: '',
+    confirmPassword: ''
+  });
+  const [passwordChanging, setPasswordChanging] = useState(false);
   const [loading, setLoading] = useState(false);
   const [submitting, setSubmitting] = useState(false);
   const [copySuccess, setCopySuccess] = useState<number | null>(null);
@@ -108,6 +115,32 @@ const App = () => {
     }
   };
 
+  const handleChangePassword = async (e: React.FormEvent) => {
+    e.preventDefault();
+    if (passwordForm.newPassword !== passwordForm.confirmPassword) {
+      return alert('새 비밀번호가 일치하지 않습니다.');
+    }
+    if (passwordForm.newPassword.length < 4) {
+      return alert('비밀번호는 4자 이상이어야 합니다.');
+    }
+
+    setPasswordChanging(true);
+    try {
+      await axios.post(`${API_BASE}/auth/change-password`, {
+        currentPassword: passwordForm.currentPassword,
+        newPassword: passwordForm.newPassword
+      });
+      alert('비밀번호가 성공적으로 변경되었습니다. 보안을 위해 다시 로그인해 주세요.');
+      handleLogout();
+      setShowPasswordModal(false);
+      setPasswordForm({ currentPassword: '', newPassword: '', confirmPassword: '' });
+    } catch (err: any) {
+      alert(err.response?.data?.error || '비밀번호 변경에 실패했습니다.');
+    } finally {
+      setPasswordChanging(false);
+    }
+  };
+
   useEffect(() => {
     if (user) {
       fetchLicenses();
@@ -197,7 +230,10 @@ const App = () => {
               <div className="w-8 h-8 rounded-full bg-slate-100 flex items-center justify-center font-bold text-slate-500 text-xs">
                 {user?.name?.[0] || 'A'}
               </div>
-              <span className="text-sm font-bold text-slate-700">{user?.name}님</span>
+              <div className="flex flex-col -space-y-0.5">
+                <span className="text-sm font-bold text-slate-700">{user?.name}님</span>
+                <button onClick={() => setShowPasswordModal(true)} className="text-[10px] text-indigo-500 font-bold hover:underline text-left">비밀번호 변경</button>
+              </div>
             </div>
             <button onClick={handleLogout} className="flex items-center gap-2 text-slate-400 hover:text-red-500 transition-all group">
               <span className="text-xs font-bold">로그아웃</span>
@@ -380,6 +416,90 @@ const App = () => {
         </section>
       </main>
 
+      {/* Password Change Modal */}
+      {showPasswordModal && (
+        <div className="fixed inset-0 z-[100] flex items-center justify-center p-4 bg-slate-900/40 backdrop-blur-sm animate-in fade-in duration-200">
+          <div className="bg-white w-full max-w-md rounded-3xl shadow-2xl border border-slate-200 overflow-hidden animate-in zoom-in-95 duration-200">
+            <div className="p-6 border-b border-slate-100 flex items-center justify-between bg-slate-50/50">
+              <div className="flex items-center gap-3">
+                <div className="bg-indigo-600 p-2 rounded-xl text-white">
+                  <Lock size={18} />
+                </div>
+                <h3 className="text-lg font-bold">비밀번호 변경</h3>
+              </div>
+              <button
+                onClick={() => {
+                  setShowPasswordModal(false);
+                  setPasswordForm({ currentPassword: '', newPassword: '', confirmPassword: '' });
+                }}
+                className="p-2 hover:bg-slate-200 rounded-full transition-all text-slate-400"
+              >
+                <X size={20} />
+              </button>
+            </div>
+            <form onSubmit={handleChangePassword} className="p-6 space-y-5">
+              <div className="space-y-1.5">
+                <label className="block text-[11px] font-bold text-slate-400 uppercase tracking-wider ml-1">현재 비밀번호</label>
+                <input
+                  type="password"
+                  required
+                  value={passwordForm.currentPassword}
+                  onChange={e => setPasswordForm({ ...passwordForm, currentPassword: e.target.value })}
+                  placeholder="현재 비밀번호 입력"
+                  className="w-full px-4 py-3 bg-slate-50 border border-slate-100 rounded-2xl focus:bg-white focus:ring-4 focus:ring-indigo-50 focus:border-indigo-500 outline-none transition-all text-sm"
+                />
+              </div>
+              <div className="space-y-1.5">
+                <label className="block text-[11px] font-bold text-slate-400 uppercase tracking-wider ml-1">새 비밀번호</label>
+                <input
+                  type="password"
+                  required
+                  value={passwordForm.newPassword}
+                  onChange={e => setPasswordForm({ ...passwordForm, newPassword: e.target.value })}
+                  placeholder="새 비밀번호 입력 (4자 이상)"
+                  className="w-full px-4 py-3 bg-slate-50 border border-slate-100 rounded-2xl focus:bg-white focus:ring-4 focus:ring-indigo-50 focus:border-indigo-500 outline-none transition-all text-sm"
+                />
+              </div>
+              <div className="space-y-1.5">
+                <label className="block text-[11px] font-bold text-slate-400 uppercase tracking-wider ml-1">새 비밀번호 확인</label>
+                <input
+                  type="password"
+                  required
+                  value={passwordForm.confirmPassword}
+                  onChange={e => setPasswordForm({ ...passwordForm, confirmPassword: e.target.value })}
+                  placeholder="새 비밀번호 다시 입력"
+                  className="w-full px-4 py-3 bg-slate-50 border border-slate-100 rounded-2xl focus:bg-white focus:ring-4 focus:ring-indigo-50 focus:border-indigo-500 outline-none transition-all text-sm"
+                />
+              </div>
+
+              <div className="pt-2 flex gap-3">
+                <button
+                  type="button"
+                  onClick={() => setShowPasswordModal(false)}
+                  className="flex-1 px-4 py-3.5 bg-slate-100 text-slate-600 font-bold rounded-2xl hover:bg-slate-200 transition-all text-sm"
+                >
+                  취소
+                </button>
+                <button
+                  type="submit"
+                  disabled={passwordChanging}
+                  className="flex-3 bg-slate-900 text-white font-bold py-3.5 px-8 rounded-2xl hover:bg-indigo-600 transition-all shadow-lg flex items-center justify-center gap-2 disabled:opacity-50"
+                >
+                  {passwordChanging ? (
+                    <>
+                      <Loader2 size={18} className="animate-spin" />
+                      <span>변경 중...</span>
+                    </>
+                  ) : (
+                    <span>비밀번호 변경하기</span>
+                  )}
+                </button>
+              </div>
+            </form>
+          </div>
+        </div>
+      )}
+
       <style>{`
         .custom-scrollbar::-webkit-scrollbar { width: 5px; height: 5px; }
         .custom-scrollbar::-webkit-scrollbar-track { background: transparent; }

docs/deployment.md

@@ -21,7 +21,7 @@ Synology NAS 환경에서 통합 운영을 위해 Express 서버가 빌드된
 최초 로그인 시 아래 계정을 사용하세요.
 
 - **ID**: `admin`
-- **Password**: `^Ocean1472bk`
+- **Password**: 보안을 위해 문서에서 관리하지 않습니다 (최초 1회 `admin1234` 접속 후 바로 변경 권장)
 
 > [!NOTE]
 > 만약 로그인이 되지 않는다면 서버 터미널에서 `node init_db.js`를 실행하여 계정을 생성해 주세요.

docs/usage.md

@@ -8,7 +8,10 @@
 
 ### 로그인
 - **주소**: `http://[NAS-IP 또는 도메인]:3006`
-- **초기 계정**: `admin` / `^Ocean1472bk`
+- **초기 계정**: `admin` / `admin1234`
+
+> [!IMPORTANT]
+> 보안을 위해 최초 접속 후 우측 상단 사용자 이름 아래의 **'비밀번호 변경'** 버튼을 클릭하여 비밀번호를 반드시 수정해 주시기 바랍니다.
 
 ### 라이선스 신규 발급
 1. 왼쪽 **'라이선스 신규 발급'** 패널에서 정보를 입력합니다.

server/init_db.js

@@ -56,7 +56,7 @@ async function init() {
         // Seed Initial Admin
         const bcrypt = require('bcryptjs');
         const adminId = 'admin';
-        const adminPw = '^Ocean1472bk';
+        const adminPw = 'admin1234';
         const [existing] = await connection.query('SELECT id FROM users WHERE login_id = ?', [adminId]);
 
         if (existing.length === 0) {

server/server.js

@@ -81,6 +81,28 @@ app.post('/api/auth/logout', (req, res) => {
     res.json({ success: true });
 });
 
+app.post('/api/auth/change-password', authenticateToken, async (req, res) => {
+    const { currentPassword, newPassword } = req.body;
+    const userId = req.user.id;
+
+    try {
+        const [users] = await db.query('SELECT * FROM users WHERE id = ?', [userId]);
+        if (users.length === 0) return res.status(404).json({ error: 'User not found' });
+
+        const user = users[0];
+        const validPassword = await bcrypt.compare(currentPassword, user.password);
+        if (!validPassword) return res.status(400).json({ error: '현재 비밀번호가 일치하지 않습니다.' });
+
+        const hashedPw = await bcrypt.hash(newPassword, 10);
+        await db.query('UPDATE users SET password = ? WHERE id = ?', [hashedPw, userId]);
+
+        res.json({ success: true, message: '비밀번호가 성공적으로 변경되었습니다.' });
+    } catch (err) {
+        console.error(err);
+        res.status(500).json({ error: '비밀번호 변경 실패' });
+    }
+});
+
 // --- License Routes ---
 // 1. Get All Issued Licenses
 app.get('/api/licenses', authenticateToken, async (req, res) => {