feat: Implement user permission management with presets and dynamic access control

Web/app.py

@@ -145,6 +145,79 @@ _NOTIFICATION_CACHE_LOCK = threading.Lock()
 
 SCHOOL_PERIODS = cfg.SCHOOL_PERIODS
 
+PERMISSION_ACTION_OPTIONS = [
+    ('can_borrow', 'Ausleihe erlauben'),
+    ('can_insert', 'Einfügen/Hochladen erlauben'),
+    ('can_edit', 'Bearbeiten erlauben'),
+    ('can_delete', 'Löschen erlauben'),
+    ('can_manage_users', 'Benutzerverwaltung erlauben'),
+    ('can_manage_settings', 'Systemverwaltung erlauben'),
+    ('can_view_logs', 'Logs/Audit einsehen erlauben'),
+]
+
+PERMISSION_PAGE_OPTIONS = [
+    ('home', 'Artikel (Inventar)'),
+    ('tutorial_page', 'Tutorial'),
+    ('my_borrowed_items', 'Meine Ausleihen'),
+    ('notifications_view', 'Benachrichtigungen'),
+    ('impressum', 'Impressum'),
+    ('license', 'Lizenz'),
+    ('library_view', 'Bibliothek (Medien)'),
+    ('terminplan', 'Terminplan'),
+    ('home_admin', 'Admin Startseite'),
+    ('upload_admin', 'Admin Upload Inventar'),
+    ('library_admin', 'Admin Upload Bibliothek'),
+    ('admin_borrowings', 'Admin Ausleihen'),
+    ('library_loans_admin', 'Admin Bibliotheks-Ausleihen'),
+    ('admin_damaged_items', 'Admin Defekte Items'),
+    ('admin_audit_dashboard', 'Admin Audit Dashboard'),
+    ('logs', 'System-Logs'),
+    ('user_del', 'Benutzerverwaltung'),
+    ('register', 'Benutzer anlegen'),
+    ('manage_filters', 'Filter verwalten'),
+    ('manage_locations', 'Orte verwalten'),
+]
+
+PERMISSION_EXEMPT_ENDPOINTS = {
+    'static',
+    'login',
+    'logout',
+    'impressum',
+    'license',
+    'uploaded_file',
+    'thumbnail_file',
+    'preview_file',
+}
+
+PERMISSION_ACTION_ENDPOINTS = {
+    'upload_item': 'can_insert',
+    'upload_inventory_excel': 'can_insert',
+    'upload_library_excel': 'can_insert',
+    'upload_student_cards_excel': 'can_insert',
+    'edit_item': 'can_edit',
+    'api_library_item_update': 'can_edit',
+    'admin_update_user_name': 'can_edit',
+    'delete_item': 'can_delete',
+    'delete_user': 'can_delete',
+    'ausleihen': 'can_borrow',
+    'zurueckgeben': 'can_borrow',
+    'api_library_scan_action': 'can_borrow',
+    'user_del': 'can_manage_users',
+    'register': 'can_manage_users',
+    'admin_reset_user_password': 'can_manage_users',
+    'admin_update_user_permissions': 'can_manage_users',
+    'home_admin': 'can_manage_settings',
+    'upload_admin': 'can_manage_settings',
+    'library_admin': 'can_manage_settings',
+    'admin_borrowings': 'can_manage_settings',
+    'library_loans_admin': 'can_manage_settings',
+    'admin_damaged_items': 'can_manage_settings',
+    'manage_filters': 'can_manage_settings',
+    'manage_locations': 'can_manage_settings',
+    'admin_audit_dashboard': 'can_view_logs',
+    'logs': 'can_view_logs',
+}
+
 # Apply the configuration for general use throughout the app
 APP_VERSION = __version__
 RELEASE_STATE_FILE = os.path.join(os.path.dirname(BASE_DIR), '.release-version')
@@ -199,6 +272,47 @@ def _enforce_csrf_protection():
     return None
 
 
+@app.before_request
+def _enforce_user_permissions():
+    endpoint = request.endpoint
+    if not endpoint:
+        return None
+
+    if endpoint == 'static' or endpoint.startswith('static'):
+        return None
+
+    if endpoint in PERMISSION_EXEMPT_ENDPOINTS:
+        return None
+
+    if 'username' not in session:
+        return None
+
+    permissions = _get_current_user_permissions()
+    if not permissions:
+        return None
+
+    if not _page_access_allowed(permissions, endpoint):
+        message = 'Diese Seite ist für Ihren Benutzer aktuell gesperrt.'
+        if request.path.startswith('/api/') or request.is_json:
+            return jsonify({'ok': False, 'message': message}), 403
+
+        flash(message, 'error')
+        fallback_endpoint = _permission_denied_fallback_endpoint(permissions)
+        return redirect(url_for(fallback_endpoint))
+
+    action_key = PERMISSION_ACTION_ENDPOINTS.get(endpoint)
+    if action_key and not _action_access_allowed(permissions, action_key):
+        message = 'Für diese Aktion fehlen Ihnen die erforderlichen Berechtigungen.'
+        if request.path.startswith('/api/') or request.is_json:
+            return jsonify({'ok': False, 'message': message}), 403
+
+        flash(message, 'error')
+        fallback_endpoint = _permission_denied_fallback_endpoint(permissions)
+        return redirect(url_for(fallback_endpoint))
+
+    return None
+
+
 def _get_asset_version():
     """Return a cache-busting asset version tied to deployment state."""
     env_version = os.getenv('INVENTAR_ASSET_VERSION', '').strip()
@@ -237,6 +351,37 @@ def _get_current_module(path):
     return 'inventory'
 
 
+def _get_current_user_permissions():
+    username = session.get('username')
+    if not username:
+        return None
+    try:
+        return us.get_effective_permissions(username)
+    except Exception:
+        return us.build_default_permission_payload('standard_user')
+
+
+def _page_access_allowed(permissions, endpoint):
+    if not permissions or not endpoint:
+        return True
+    page_permissions = permissions.get('pages', {})
+    return bool(page_permissions.get(endpoint, True))
+
+
+def _action_access_allowed(permissions, action_key):
+    if not permissions or not action_key:
+        return True
+    action_permissions = permissions.get('actions', {})
+    return bool(action_permissions.get(action_key, True))
+
+
+def _permission_denied_fallback_endpoint(permissions):
+    for candidate in ('home', 'my_borrowed_items', 'tutorial_page', 'notifications_view', 'impressum'):
+        if _page_access_allowed(permissions, candidate):
+            return candidate
+    return 'logout'
+
+
 def _append_audit_event(db, event_type, payload):
     """Write an audit entry; never break business flow on audit failures."""
     try:
@@ -845,12 +990,18 @@ def inject_version():
     asset_version = _get_asset_version()
     csrf_token = _get_csrf_token()
     unread_notification_count = 0
+    current_permissions = us.build_default_permission_payload('standard_user')
     if 'username' in session:
         try:
             is_admin = us.check_admin(session['username'])
         except Exception:
             is_admin = False
 
+        try:
+            current_permissions = us.get_effective_permissions(session['username'])
+        except Exception:
+            current_permissions = us.build_default_permission_payload('standard_user')
+
         client = None
         try:
             client = MongoClient(MONGODB_HOST, MONGODB_PORT)
@@ -874,6 +1025,10 @@ def inject_version():
         'student_cards_module_enabled': cfg.STUDENT_CARDS_MODULE_ENABLED,
         'is_admin': is_admin,
         'unread_notification_count': unread_notification_count,
+        'current_permissions': current_permissions,
+        'permission_action_options': PERMISSION_ACTION_OPTIONS,
+        'permission_page_options': PERMISSION_PAGE_OPTIONS,
+        'permission_presets': us.get_permission_preset_definitions(),
     }
 
 # Create necessary directories at startup
@@ -6577,6 +6732,10 @@ def user_del():
                 break
                 
         if username and username != session['username']:
+            try:
+                permissions_payload = us.get_effective_permissions(username)
+            except Exception:
+                permissions_payload = us.build_default_permission_payload('standard_user')
             try:
                 name = us.get_name(username)
                 last_name = us.get_last_name(username)
@@ -6597,7 +6756,10 @@ def user_del():
                 'admin': user.get('Admin', False),
                 'fullname': fullname,
                 'name': name,
-                'last_name': last_name
+                'last_name': last_name,
+                'permission_preset': permissions_payload.get('preset', 'standard_user'),
+                'action_permissions': permissions_payload.get('actions', {}),
+                'page_permissions': permissions_payload.get('pages', {}),
             })
     
     return render_template(
@@ -7614,6 +7776,41 @@ def admin_update_user_name():
     return redirect(url_for('user_del'))
 
 
+@app.route('/admin_update_user_permissions', methods=['POST'])
+def admin_update_user_permissions():
+    """Admin route to update permission preset and per-endpoint overrides for a user."""
+    if 'username' not in session or not us.check_admin(session['username']):
+        flash('Nicht autorisierter Zugriff', 'error')
+        return redirect(url_for('login'))
+
+    username = request.form.get('username', '').strip()
+    preset_key = request.form.get('permission_preset', 'standard_user').strip()
+
+    if not username:
+        flash('Kein Benutzer ausgewählt', 'error')
+        return redirect(url_for('user_del'))
+
+    target_user = us.get_user(username)
+    if not target_user:
+        flash(f'Benutzer {username} nicht gefunden', 'error')
+        return redirect(url_for('user_del'))
+
+    action_permissions = {}
+    for action_key, _ in PERMISSION_ACTION_OPTIONS:
+        action_permissions[action_key] = request.form.get(f'action_{action_key}') == 'on'
+
+    page_permissions = {}
+    for endpoint_name, _ in PERMISSION_PAGE_OPTIONS:
+        page_permissions[endpoint_name] = request.form.get(f'page_{endpoint_name}') == 'on'
+
+    if us.update_user_permissions(username, preset_key, action_permissions, page_permissions):
+        flash(f'Berechtigungen für {username} wurden aktualisiert.', 'success')
+    else:
+        flash('Fehler beim Aktualisieren der Berechtigungen.', 'error')
+
+    return redirect(url_for('user_del'))
+
+
 @app.route('/logs')
 def logs():
     """

Web/templates/base.html

@@ -769,18 +769,24 @@
             </button>
             <div class="collapse navbar-collapse" id="inventoryNavContent">
                 <ul class="navbar-nav me-auto mb-2 mb-lg-0" id="inventoryNavList">
+                    {% if current_permissions.pages.get('home', True) %}
                     <li class="nav-item" data-nav-fixed="true">
                         <a class="nav-link {% if current_path == url_for('home') %}nav-active{% endif %}" href="{{ url_for('home') }}">Artikel</a>
                     </li>
+                    {% endif %}
                     {% if 'username' in session %}
+                    {% if current_permissions.pages.get('my_borrowed_items', True) %}
                     <li class="nav-item" data-nav-fixed="true">
                         <a class="nav-link quick-link-pill {% if current_path == url_for('my_borrowed_items') %}nav-active{% endif %}" href="{{ url_for('my_borrowed_items') }}">Meine Ausleihen</a>
                     </li>
+                    {% endif %}
+                    {% if current_permissions.pages.get('tutorial_page', True) %}
                     <li class="nav-item" data-nav-fixed="true">
                         <a class="nav-link quick-link-pill {% if current_path == url_for('tutorial_page') %}nav-active{% endif %}" href="{{ url_for('tutorial_page') }}">Tutorial</a>
                     </li>
                     {% endif %}
-                    {% if 'username' in session and (session.get('admin', False) or is_admin) %}
+                    {% endif %}
+                    {% if 'username' in session and (session.get('admin', False) or is_admin) and current_permissions.pages.get('upload_admin', True) and current_permissions.actions.get('can_manage_settings', True) %}
                     <li class="nav-item">
                         <a class="nav-link nav-priority-link {% if current_path == url_for('upload_admin') %}nav-active{% endif %}" href="{{ url_for('upload_admin') }}">➕ Hochladen</a>
                     </li>
@@ -791,24 +797,46 @@
                         </a>
                         <ul class="dropdown-menu dropdown-menu-end" aria-labelledby="invMoreDropdown">
                             {% if 'username' in session %}
+                            {% if current_permissions.pages.get('my_borrowed_items', True) %}
                             <li><a class="dropdown-item" href="{{ url_for('my_borrowed_items') }}">Meine Ausleihen</a></li>
+                            {% endif %}
+                            {% if current_permissions.pages.get('tutorial_page', True) %}
                             <li><a class="dropdown-item" href="{{ url_for('tutorial_page') }}">Tutorial</a></li>
+                            {% endif %}
                             <li><hr class="dropdown-divider"></li>
                             {% endif %}
-                            {% if 'username' in session and (session.get('admin', False) or is_admin) %}
+                            {% if 'username' in session and (session.get('admin', False) or is_admin) and current_permissions.actions.get('can_manage_settings', True) %}
                             <li><h6 class="dropdown-header">Verwaltung</h6></li>
+                            {% if current_permissions.pages.get('manage_filters', True) %}
                             <li><a class="dropdown-item" href="{{ url_for('manage_filters') }}">Filter verwalten</a></li>
+                            {% endif %}
+                            {% if current_permissions.pages.get('manage_locations', True) %}
                             <li><a class="dropdown-item" href="{{ url_for('manage_locations') }}">Orte verwalten</a></li>
+                            {% endif %}
+                            {% if current_permissions.pages.get('admin_borrowings', True) %}
                             <li><a class="dropdown-item" href="{{ url_for('admin_borrowings') }}">Ausleihen</a></li>
+                            {% endif %}
+                            {% if current_permissions.pages.get('admin_damaged_items', True) %}
                             <li><a class="dropdown-item" href="{{ url_for('admin_damaged_items') }}">Defekte Items</a></li>
+                            {% endif %}
+                            {% if current_permissions.actions.get('can_view_logs', True) and current_permissions.pages.get('admin_audit_dashboard', True) %}
                             <li><a class="dropdown-item" href="{{ url_for('admin_audit_dashboard') }}">Audit Dashboard</a></li>
+                            {% endif %}
+                            {% if current_permissions.actions.get('can_view_logs', True) and current_permissions.pages.get('logs', True) %}
                             <li><a class="dropdown-item" href="{{ url_for('logs') }}">Logs</a></li>
+                            {% endif %}
                             <li><hr class="dropdown-divider"></li>
+                            {% if current_permissions.actions.get('can_manage_users', True) %}
                             <li><h6 class="dropdown-header">System</h6></li>
+                            {% if current_permissions.pages.get('user_del', True) %}
                             <li><a class="dropdown-item" href="{{ url_for('user_del') }}">Benutzer verwalten</a></li>
+                            {% endif %}
+                            {% if current_permissions.pages.get('register', True) %}
                             <li><a class="dropdown-item" href="{{ url_for('register') }}">Neuer Benutzer</a></li>
+                            {% endif %}
                             <li><hr class="dropdown-divider"></li>
                             {% endif %}
+                            {% endif %}
                             <li><a class="dropdown-item" href="{{ url_for('impressum') }}">Impressum</a></li>
                             <li><a class="dropdown-item" href="{{ url_for('license') }}">Lizenz</a></li>
                         </ul>
@@ -837,7 +865,9 @@
                                 <span class="user-notification-dot {% if unread_notification_count and unread_notification_count > 0 %}visible{% endif %}" aria-hidden="true"></span>
                             </button>
                             <ul class="dropdown-menu dropdown-menu-end" aria-labelledby="invUserMenuDropdown">
+                                {% if current_permissions.pages.get('notifications_view', True) %}
                                 <li><a class="dropdown-item" href="{{ url_for('notifications_view') }}">Benachrichtigungen</a></li>
+                                {% endif %}
                                 <li><hr class="dropdown-divider"></li>
                                 <li><a class="dropdown-item" href="{{ url_for('change_password') }}">Passwort ändern</a></li>
                                 <li><hr class="dropdown-divider"></li>
@@ -860,18 +890,24 @@
             </button>
             <div class="collapse navbar-collapse" id="libraryNavContent">
                 <ul class="navbar-nav me-auto mb-2 mb-lg-0" id="libraryNavList">
+                    {% if current_permissions.pages.get('library_view', True) %}
                     <li class="nav-item" data-nav-fixed="true">
                         <a class="nav-link {% if current_path == url_for('library_view') %}nav-active{% endif %}" href="{{ url_for('library_view') }}">Medien</a>
                     </li>
+                    {% endif %}
                     {% if 'username' in session %}
+                    {% if current_permissions.pages.get('my_borrowed_items', True) %}
                     <li class="nav-item" data-nav-fixed="true">
                         <a class="nav-link quick-link-pill {% if current_path == url_for('my_borrowed_items') %}nav-active{% endif %}" href="{{ url_for('my_borrowed_items') }}">Meine Medien</a>
                     </li>
+                    {% endif %}
+                    {% if current_permissions.pages.get('tutorial_page', True) %}
                     <li class="nav-item" data-nav-fixed="true">
                         <a class="nav-link quick-link-pill {% if current_path == url_for('tutorial_page') %}nav-active{% endif %}" href="{{ url_for('tutorial_page') }}">Tutorial</a>
                     </li>
                     {% endif %}
-                    {% if 'username' in session and (session.get('admin', False) or is_admin) %}
+                    {% endif %}
+                    {% if 'username' in session and (session.get('admin', False) or is_admin) and current_permissions.actions.get('can_manage_settings', True) and current_permissions.pages.get('library_admin', True) %}
                     <li class="nav-item">
                         <a class="nav-link nav-priority-link {% if current_path == url_for('library_admin') %}nav-active{% endif %}" href="{{ url_for('library_admin') }}">📖 Hochladen</a>
                     </li>
@@ -882,23 +918,37 @@
                         </a>
                         <ul class="dropdown-menu dropdown-menu-end" aria-labelledby="libMoreDropdown">
                             {% if 'username' in session %}
+                            {% if current_permissions.pages.get('my_borrowed_items', True) %}
                             <li><a class="dropdown-item" href="{{ url_for('my_borrowed_items') }}">Meine Medien</a></li>
+                            {% endif %}
+                            {% if current_permissions.pages.get('tutorial_page', True) %}
                             <li><a class="dropdown-item" href="{{ url_for('tutorial_page') }}">Tutorial</a></li>
+                            {% endif %}
                             <li><hr class="dropdown-divider"></li>
                             {% endif %}
-                            {% if 'username' in session and (session.get('admin', False) or is_admin) %}
+                            {% if 'username' in session and (session.get('admin', False) or is_admin) and current_permissions.actions.get('can_manage_settings', True) %}
                             <li><h6 class="dropdown-header">Bibliotheks-Verwaltung</h6></li>
+                            {% if current_permissions.pages.get('library_loans_admin', True) %}
                             <li><a class="dropdown-item" href="{{ url_for('library_loans_admin') }}">Ausleihen</a></li>
+                            {% endif %}
+                            {% if current_permissions.pages.get('admin_damaged_items', True) %}
                             <li><a class="dropdown-item" href="{{ url_for('admin_damaged_items') }}">Defekte Items</a></li>
+                            {% endif %}
                             {% if student_cards_module_enabled %}
                             <li><a class="dropdown-item" href="{{ url_for('student_cards_admin') }}">Bibliotheksausweis</a></li>
                             {% endif %}
                             <li><hr class="dropdown-divider"></li>
+                            {% if current_permissions.actions.get('can_manage_users', True) %}
                             <li><h6 class="dropdown-header">System</h6></li>
+                            {% if current_permissions.pages.get('user_del', True) %}
                             <li><a class="dropdown-item" href="{{ url_for('user_del') }}">Benutzer verwalten</a></li>
+                            {% endif %}
+                            {% if current_permissions.pages.get('register', True) %}
                             <li><a class="dropdown-item" href="{{ url_for('register') }}">Neuer Benutzer</a></li>
+                            {% endif %}
                             <li><hr class="dropdown-divider"></li>
                             {% endif %}
+                            {% endif %}
                             <li><a class="dropdown-item" href="{{ url_for('impressum') }}">Impressum</a></li>
                             <li><a class="dropdown-item" href="{{ url_for('license') }}">Lizenz</a></li>
                         </ul>
@@ -927,7 +977,9 @@
                                 <span class="user-notification-dot {% if unread_notification_count and unread_notification_count > 0 %}visible{% endif %}" aria-hidden="true"></span>
                             </button>
                             <ul class="dropdown-menu dropdown-menu-end" aria-labelledby="libUserMenuDropdown">
+                                {% if current_permissions.pages.get('notifications_view', True) %}
                                 <li><a class="dropdown-item" href="{{ url_for('notifications_view') }}">Benachrichtigungen</a></li>
+                                {% endif %}
                                 <li><hr class="dropdown-divider"></li>
                                 <li><a class="dropdown-item" href="{{ url_for('change_password') }}">Passwort ändern</a></li>
                                 <li><hr class="dropdown-divider"></li>

Web/templates/user_del.html

@@ -62,6 +62,7 @@
                         <th>Vorname</th>
                         <th>Nachname</th>
                         <th>Administrator</th>
+                        <th>Rechte-Preset</th>
                         <th>Aktionen</th>
                     </tr>
                 </thead>
@@ -72,6 +73,7 @@
                         <td>{{ user.name if user.name else user.username }}</td>
                         <td>{{ user.last_name if user.last_name else '' }}</td>
                         <td>{{ "Ja" if user.admin else "Nein" }}</td>
+                        <td>{{ permission_presets.get(user.permission_preset, {}).get('label', user.permission_preset) }}</td>
                         <td class="actions">
                             <form method="POST" action="{{ url_for('delete_user') }}" class="d-inline">
                                 <input type="hidden" name="username" value="{{ user.username }}">
@@ -90,6 +92,14 @@
                                     onclick="openResetPasswordModal('{{ user.username }}')">
                                 Passwort zurücksetzen
                             </button>
+                            <button type="button" class="btn btn-info btn-sm"
+                                    data-username="{{ user.username }}"
+                                    data-preset="{{ user.permission_preset }}"
+                                    data-action-permissions='{{ user.action_permissions | tojson }}'
+                                    data-page-permissions='{{ user.page_permissions | tojson }}'
+                                    onclick="openPermissionsModal(this)">
+                                Berechtigungen
+                            </button>
                         </td>
                     </tr>
                     {% endfor %}
@@ -99,6 +109,62 @@
     </div>
 </div>
 
+<!-- Permission Modal -->
+<div class="modal fade" id="permissionsModal" tabindex="-1" aria-labelledby="permissionsModalLabel" aria-hidden="true">
+    <div class="modal-dialog modal-lg">
+        <div class="modal-content">
+            <div class="modal-header">
+                <h5 class="modal-title" id="permissionsModalLabel">Berechtigungen bearbeiten</h5>
+                <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
+            </div>
+            <form method="POST" action="{{ url_for('admin_update_user_permissions') }}">
+                <div class="modal-body permissions-modal-body">
+                    <input type="hidden" id="perm-username" name="username">
+                    <div class="mb-3">
+                        <label for="perm-username-display" class="form-label">Benutzer</label>
+                        <input type="text" class="form-control" id="perm-username-display" disabled>
+                    </div>
+
+                    <div class="mb-3">
+                        <label for="permission-preset" class="form-label">Preset</label>
+                        <select class="form-select" id="permission-preset" name="permission_preset">
+                            {% for preset_key, preset_value in permission_presets.items() %}
+                            <option value="{{ preset_key }}">{{ preset_value.label }}</option>
+                            {% endfor %}
+                        </select>
+                    </div>
+
+                    <div class="permissions-grid">
+                        <div class="permissions-group">
+                            <h6>Aktionsrechte</h6>
+                            {% for action_key, action_label in permission_action_options %}
+                            <div class="form-check">
+                                <input class="form-check-input permission-action-checkbox" type="checkbox" id="action-{{ action_key }}" name="action_{{ action_key }}">
+                                <label class="form-check-label" for="action-{{ action_key }}">{{ action_label }}</label>
+                            </div>
+                            {% endfor %}
+                        </div>
+
+                        <div class="permissions-group">
+                            <h6>Seitenrechte</h6>
+                            {% for endpoint_name, endpoint_label in permission_page_options %}
+                            <div class="form-check">
+                                <input class="form-check-input permission-page-checkbox" type="checkbox" id="page-{{ endpoint_name }}" name="page_{{ endpoint_name }}">
+                                <label class="form-check-label" for="page-{{ endpoint_name }}">{{ endpoint_label }}</label>
+                            </div>
+                            {% endfor %}
+                        </div>
+                    </div>
+                </div>
+                <div class="modal-footer">
+                    <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Abbrechen</button>
+                    <button type="submit" class="btn btn-primary">Berechtigungen speichern</button>
+                </div>
+            </form>
+        </div>
+    </div>
+</div>
+
 <!-- Edit User Modal -->
 <div class="modal fade" id="editUserModal" tabindex="-1" aria-labelledby="editUserModalLabel" aria-hidden="true">
     <div class="modal-dialog">
@@ -165,6 +231,24 @@
 </div>
 
 <script>
+    var permissionPresets = {{ permission_presets | tojson }};
+
+    function applyPresetToPermissionForm(presetKey) {
+        var preset = permissionPresets[presetKey] || {};
+        var actionDefaults = preset.actions || {};
+        var pageDefaults = preset.pages || {};
+
+        document.querySelectorAll('.permission-action-checkbox').forEach(function (checkbox) {
+            var key = checkbox.name.replace('action_', '');
+            checkbox.checked = !!actionDefaults[key];
+        });
+
+        document.querySelectorAll('.permission-page-checkbox').forEach(function (checkbox) {
+            var key = checkbox.name.replace('page_', '');
+            checkbox.checked = !!pageDefaults[key];
+        });
+    }
+
     function applyFilters() {
         var search = document.getElementById('filter-search').value.toLowerCase();
         var adminFilter = document.getElementById('filter-admin').value.toLowerCase();
@@ -229,6 +313,13 @@
         document.getElementById('filter-admin').addEventListener('change', applyFilters);
         document.getElementById('filter-column').addEventListener('change', applyFilters);
         document.getElementById('filter-direction').addEventListener('change', applyFilters);
+
+        var presetSelect = document.getElementById('permission-preset');
+        if (presetSelect) {
+            presetSelect.addEventListener('change', function () {
+                applyPresetToPermissionForm(this.value);
+            });
+        }
     });
 
     function openEditUserModal(button) {
@@ -253,6 +344,42 @@
         var modal = new bootstrap.Modal(document.getElementById('resetPasswordModal'));
         modal.show();
     }
+
+    function openPermissionsModal(button) {
+        var username = button.getAttribute('data-username') || '';
+        var preset = button.getAttribute('data-preset') || 'standard_user';
+        var actionPermissions = {};
+        var pagePermissions = {};
+
+        try {
+            actionPermissions = JSON.parse(button.getAttribute('data-action-permissions') || '{}');
+        } catch (err) {
+            actionPermissions = {};
+        }
+
+        try {
+            pagePermissions = JSON.parse(button.getAttribute('data-page-permissions') || '{}');
+        } catch (err) {
+            pagePermissions = {};
+        }
+
+        document.getElementById('perm-username').value = username;
+        document.getElementById('perm-username-display').value = username;
+        document.getElementById('permission-preset').value = preset;
+
+        document.querySelectorAll('.permission-action-checkbox').forEach(function (checkbox) {
+            var key = checkbox.name.replace('action_', '');
+            checkbox.checked = !!actionPermissions[key];
+        });
+
+        document.querySelectorAll('.permission-page-checkbox').forEach(function (checkbox) {
+            var key = checkbox.name.replace('page_', '');
+            checkbox.checked = !!pagePermissions[key];
+        });
+
+        var modal = new bootstrap.Modal(document.getElementById('permissionsModal'));
+        modal.show();
+    }
 </script>
 
 <style>
@@ -286,5 +413,28 @@
     .password-requirements p {
         margin-bottom: 5px;
     }
+
+    .permissions-modal-body {
+        max-height: 70vh;
+        overflow-y: auto;
+    }
+
+    .permissions-grid {
+        display: grid;
+        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
+        gap: 18px;
+    }
+
+    .permissions-group {
+        border: 1px solid #dee2e6;
+        border-radius: 8px;
+        padding: 12px;
+        background: #f8fafc;
+    }
+
+    .permissions-group h6 {
+        font-weight: 700;
+        margin-bottom: 10px;
+    }
 </style>
 {% endblock %}

Web/user.py

@@ -11,6 +11,7 @@ Provides methods for creating, validating, and retrieving user information.
    For commercial licensing inquiries: https://github.com/AIIrondev
 '''
 import hashlib
+import copy
 from bson.objectid import ObjectId
 import settings as cfg
 from settings import MongoClient
@@ -23,6 +24,220 @@ def normalize_student_card_id(card_id):
     return str(card_id).strip().upper()
 
 
+ACTION_PERMISSION_KEYS = (
+    'can_borrow',
+    'can_insert',
+    'can_edit',
+    'can_delete',
+    'can_manage_users',
+    'can_manage_settings',
+    'can_view_logs',
+)
+
+DEFAULT_ACTION_PERMISSIONS = {
+    'can_borrow': True,
+    'can_insert': False,
+    'can_edit': False,
+    'can_delete': False,
+    'can_manage_users': False,
+    'can_manage_settings': False,
+    'can_view_logs': False,
+}
+
+DEFAULT_PAGE_PERMISSIONS = {
+    'home': True,
+    'tutorial_page': True,
+    'my_borrowed_items': True,
+    'notifications_view': True,
+    'impressum': True,
+    'license': True,
+    'library_view': True,
+    'terminplan': True,
+    'home_admin': False,
+    'upload_admin': False,
+    'library_admin': False,
+    'admin_borrowings': False,
+    'library_loans_admin': False,
+    'admin_damaged_items': False,
+    'admin_audit_dashboard': False,
+    'logs': False,
+    'user_del': False,
+    'register': False,
+    'manage_filters': False,
+    'manage_locations': False,
+}
+
+PERMISSION_PRESETS = {
+    'standard_user': {
+        'label': 'Standard (Ausleihe)',
+        'actions': {
+            'can_borrow': True,
+        },
+        'pages': {
+            'home': True,
+            'tutorial_page': True,
+            'my_borrowed_items': True,
+            'notifications_view': True,
+            'impressum': True,
+            'license': True,
+            'library_view': True,
+            'terminplan': True,
+        },
+    },
+    'editor': {
+        'label': 'Editor (Einfügen/Bearbeiten)',
+        'actions': {
+            'can_borrow': True,
+            'can_insert': True,
+            'can_edit': True,
+        },
+        'pages': {
+            'home': True,
+            'tutorial_page': True,
+            'my_borrowed_items': True,
+            'notifications_view': True,
+            'impressum': True,
+            'license': True,
+            'library_view': True,
+            'terminplan': True,
+            'upload_admin': True,
+            'library_admin': True,
+        },
+    },
+    'manager': {
+        'label': 'Manager (inkl. Löschen)',
+        'actions': {
+            'can_borrow': True,
+            'can_insert': True,
+            'can_edit': True,
+            'can_delete': True,
+            'can_manage_settings': True,
+            'can_view_logs': True,
+        },
+        'pages': {
+            'home': True,
+            'tutorial_page': True,
+            'my_borrowed_items': True,
+            'notifications_view': True,
+            'impressum': True,
+            'license': True,
+            'library_view': True,
+            'terminplan': True,
+            'home_admin': True,
+            'upload_admin': True,
+            'library_admin': True,
+            'admin_borrowings': True,
+            'library_loans_admin': True,
+            'admin_damaged_items': True,
+            'admin_audit_dashboard': True,
+            'logs': True,
+            'manage_filters': True,
+            'manage_locations': True,
+        },
+    },
+    'full_access': {
+        'label': 'Vollzugriff',
+        'actions': {
+            'can_borrow': True,
+            'can_insert': True,
+            'can_edit': True,
+            'can_delete': True,
+            'can_manage_users': True,
+            'can_manage_settings': True,
+            'can_view_logs': True,
+        },
+        'pages': {
+            'home': True,
+            'tutorial_page': True,
+            'my_borrowed_items': True,
+            'notifications_view': True,
+            'impressum': True,
+            'license': True,
+            'library_view': True,
+            'terminplan': True,
+            'home_admin': True,
+            'upload_admin': True,
+            'library_admin': True,
+            'admin_borrowings': True,
+            'library_loans_admin': True,
+            'admin_damaged_items': True,
+            'admin_audit_dashboard': True,
+            'logs': True,
+            'user_del': True,
+            'register': True,
+            'manage_filters': True,
+            'manage_locations': True,
+        },
+    },
+}
+
+
+def _normalize_bool_map(source, defaults):
+    result = dict(defaults)
+    if isinstance(source, dict):
+        for key, value in source.items():
+            result[str(key)] = bool(value)
+    return result
+
+
+def get_permission_preset_definitions():
+    return copy.deepcopy(PERMISSION_PRESETS)
+
+
+def build_default_permission_payload(preset_key='standard_user'):
+    selected_key = preset_key if preset_key in PERMISSION_PRESETS else 'standard_user'
+    preset = PERMISSION_PRESETS.get(selected_key, {})
+    action_defaults = _normalize_bool_map(preset.get('actions', {}), DEFAULT_ACTION_PERMISSIONS)
+    page_defaults = _normalize_bool_map(preset.get('pages', {}), DEFAULT_PAGE_PERMISSIONS)
+    return {
+        'preset': selected_key,
+        'actions': action_defaults,
+        'pages': page_defaults,
+    }
+
+
+def get_effective_permissions(username):
+    user = get_user(username)
+    if not user:
+        return build_default_permission_payload('standard_user')
+
+    preset_key = user.get('PermissionPreset') or 'standard_user'
+    payload = build_default_permission_payload(preset_key)
+    payload['actions'] = _normalize_bool_map(user.get('ActionPermissions', {}), payload['actions'])
+    payload['pages'] = _normalize_bool_map(user.get('PagePermissions', {}), payload['pages'])
+    return payload
+
+
+def update_user_permissions(username, preset_key, action_permissions=None, page_permissions=None):
+    selected_key = preset_key if preset_key in PERMISSION_PRESETS else 'standard_user'
+    payload = build_default_permission_payload(selected_key)
+
+    if isinstance(action_permissions, dict):
+        for key, value in action_permissions.items():
+            payload['actions'][str(key)] = bool(value)
+
+    if isinstance(page_permissions, dict):
+        for key, value in page_permissions.items():
+            payload['pages'][str(key)] = bool(value)
+
+    update_data = {
+        'PermissionPreset': payload['preset'],
+        'ActionPermissions': payload['actions'],
+        'PagePermissions': payload['pages'],
+    }
+
+    client = MongoClient(cfg.MONGODB_HOST, cfg.MONGODB_PORT)
+    db = client[cfg.MONGODB_DB]
+    users = db['users']
+    result = users.update_one({'Username': username}, {'$set': update_data})
+
+    if result.matched_count == 0:
+        result = users.update_one({'username': username}, {'$set': update_data})
+
+    client.close()
+    return result.matched_count > 0
+
+
 # === FAVORITES MANAGEMENT ===
 def get_favorites(username):
     """Return a list of favorite item ObjectId strings for the user."""
@@ -144,6 +359,8 @@ def add_user(username, password, name, last_name, is_student=False, student_card
     users = db['users']
     if not check_password_strength(password):
         return False
+    permission_defaults = build_default_permission_payload('standard_user')
+
     user_doc = {
         'Username': username,
         'Password': hashing(password),
@@ -151,7 +368,10 @@ def add_user(username, password, name, last_name, is_student=False, student_card
         'active_ausleihung': None,
         'name': name,
         'last_name': last_name,
-        'IsStudent': bool(is_student)
+        'IsStudent': bool(is_student),
+        'PermissionPreset': permission_defaults['preset'],
+        'ActionPermissions': permission_defaults['actions'],
+        'PagePermissions': permission_defaults['pages'],
     }
 
     normalized_card = normalize_student_card_id(student_card_id)