implementation of the export for users

Web/app.py

@@ -8628,6 +8628,72 @@ def register_csv():
         mimetype='application/pdf'
     )
 
+@app.route('/export_users_csv', methods=['POST'])
+def export_users_csv():
+    """
+    Exports a filtered list of users to a CSV file.
+    Receives a JSON array of usernames from the frontend.
+    """
+    if 'username' not in session:
+        flash('Ihnen ist es nicht gestattet, diese Aktion auszuführen.', 'error')
+        return redirect(url_for('login'))
+
+    usernames_json = request.form.get('usernames')
+    if not usernames_json:
+        flash('Keine Benutzer zum Exportieren ausgewählt.', 'error')
+        return redirect(url_for('user_del'))
+
+    try:
+        target_usernames = json.loads(usernames_json)
+    except json.JSONDecodeError:
+        flash('Ungültige Daten beim Export übermittelt.', 'error')
+        return redirect(url_for('user_del'))
+
+    # Fetch all users
+    all_users = us.get_all_users()
+
+    # Create CSV in memory
+    si = io.StringIO()
+    # Delimiter set to semicolon (standard for Excel in German locales)
+    cw = csv.writer(si, delimiter=';')
+
+    # Write headers
+    cw.writerow(['Benutzername', 'Vorname', 'Nachname', 'Administrator', 'Rechte-Preset'])
+
+    for user in all_users:
+        encrypted_username = user.get('Username')
+        if not encrypted_username:
+            continue
+
+        uname = decrypt_text(encrypted_username)
+
+        # Only process users that were present in the frontend's filtered view
+        if uname in target_usernames:
+            try:
+                permissions_payload = us.get_effective_permissions(uname)
+                preset = permissions_payload.get('preset', 'standard_user')
+            except Exception:
+                preset = 'standard_user'
+
+            try:
+                name = us.get_name(uname) or ""
+                last_name = us.get_last_name(uname) or ""
+            except Exception:
+                name = ""
+                last_name = ""
+
+            admin_status = "Ja" if user.get('Admin', False) else "Nein"
+
+            cw.writerow([uname, name, last_name, admin_status, preset])
+
+    # Prefix with BOM (Byte Order Mark) to ensure Excel reads UTF-8 (Umlauts) correctly
+    output = '\ufeff' + si.getvalue()
+
+    return Response(
+        output,
+        mimetype="text/csv",
+        headers={"Content-disposition": "attachment; filename=benutzer_export.csv"}
+    )
 
 @app.route('/user_del', methods=['GET'])
 def user_del():

Web/templates/user_del.html

@@ -53,8 +53,11 @@
                         <option value="desc">Absteigend</option>
                     </select>
                 </div>
-                <div class="col-md-2">
+                <div class="col-md-3">
-                    <button class="btn btn-secondary w-100" onclick="resetFilters()">Filter zurücksetzen</button>
+                    <div class="d-flex gap-2">
+                        <button class="btn btn-secondary flex-grow-1" onclick="resetFilters()">Zurücksetzen</button>
+                        <button class="btn btn-success flex-grow-1" onclick="exportFilteredUsers()">Exportieren</button>
+                    </div>
                 </div>
             </div>
             <div class="mt-2 text-muted small" id="filter-count"></div>
@@ -87,14 +90,14 @@
                                     Löschen
                                 </button>
                             </form>
-                            <button type="button" class="btn btn-primary btn-sm" 
+                            <button type="button" class="btn btn-primary btn-sm"
                                     data-username="{{ user.username }}"
                                     data-firstname="{{ user.name if user.name else '' }}"
                                     data-lastname="{{ user.last_name if user.last_name else '' }}"
                                     onclick="openEditUserModal(this)">
                                 Bearbeiten
                             </button>
-                            <button type="button" class="btn btn-warning btn-sm" 
+                            <button type="button" class="btn btn-warning btn-sm"
                                     onclick="openResetPasswordModal('{{ user.username }}')">
                                 Passwort zurücksetzen
                             </button>
@@ -313,6 +316,48 @@
         applyFilters();
     }
 
+    function exportFilteredUsers() {
+        var table = document.getElementById('user-table');
+        var tbody = table.querySelector('tbody');
+        var rows = Array.from(tbody.querySelectorAll('tr'));
+
+        var visibleUsernames = [];
+
+        // Sammle alle Benutzernamen, die durch den Filter aktuell NICHT versteckt sind
+        rows.forEach(function(row) {
+            if (row.style.display !== 'none') {
+                var cells = row.querySelectorAll('td');
+                if (cells.length > 0) {
+                    // Der Benutzername ist in der ersten Spalte (Index 0)
+                    visibleUsernames.push(cells[0].textContent.trim());
+                }
+            }
+        });
+
+        if (visibleUsernames.length === 0) {
+            alert('Keine Benutzer zum Exportieren vorhanden.');
+            return;
+        }
+
+        // Dynamisches Formular erstellen, um die gefilterten Daten per POST ans Backend zu senden
+        var form = document.createElement('form');
+        form.method = 'POST';
+        form.action = "{{ url_for('export_users_csv') }}"; // Passe dies ggf. an deinen Endpunktnamen an
+
+        var input = document.createElement('input');
+        input.type = 'hidden';
+        input.name = 'usernames';
+        input.value = JSON.stringify(visibleUsernames);
+
+        form.appendChild(input);
+        document.body.appendChild(form);
+
+        form.submit();
+
+        // Aufräumen
+        document.body.removeChild(form);
+    }
+
     document.addEventListener('DOMContentLoaded', function() {
         applyFilters();
         document.getElementById('filter-search').addEventListener('input', applyFilters);
@@ -332,12 +377,12 @@
         var username = button.getAttribute('data-username');
         var name = button.getAttribute('data-firstname');
         var lastName = button.getAttribute('data-lastname');
-        
+
         document.getElementById('edit-username').value = username;
         document.getElementById('edit-username-display').value = username;
         document.getElementById('edit-name').value = name;
         document.getElementById('edit-last-name').value = lastName;
-        
+
         var modal = new bootstrap.Modal(document.getElementById('editUserModal'));
         modal.show();
     }
@@ -345,8 +390,7 @@
     function openResetPasswordModal(username) {
         document.getElementById('reset-username').value = username;
         document.getElementById('username-display').value = username;
-        
+
-        // Open modal using Bootstrap
         var modal = new bootstrap.Modal(document.getElementById('resetPasswordModal'));
         modal.show();
     }