Fix of the notifikationssystem

Web/app.py

@@ -10373,6 +10373,14 @@ def my_borrowed_items():
     )
 
 
+@app.route('/api/push/vapid-key', methods=['GET'])
+def get_vapid_key():
+    """Returns the VAPID public key for web push subscriptions."""
+    from Web.push_notifications import _get_vapid_public
+    if not _get_vapid_public():
+        return jsonify({'error': 'VAPID public key not configured'}), 500
+    return jsonify({'publicKey': _get_vapid_public()})
+
 @app.route('/notifications')
 def notifications_view():
     """Notification center for users and admins."""

Web/push_notifications.py

@@ -40,14 +40,18 @@ try:
     else:
         vapid = Vapid.from_file(VAPID_PRIVATE_PEM)
 
-    # Extract public key in standard uncompressed point format encoded in URL-safe base64
     raw_pub = vapid.public_key.public_bytes(
         serialization.Encoding.X962,
         serialization.PublicFormat.UncompressedPoint
     )
 
-    VAPID_PUBLIC_KEY = b64urlencode(raw_pub).decode('utf-8')
-    VAPID_PRIVATE_KEY = VAPID_PRIVATE_PEM  # pywebpush accepts the file path to the private PEM
+    encoded_pub = b64urlencode(raw_pub)
+    if isinstance(encoded_pub, bytes):
+        VAPID_PUBLIC_KEY = encoded_pub.decode('utf-8')
+    else:
+        VAPID_PUBLIC_KEY = encoded_pub
+
+    VAPID_PRIVATE_KEY = VAPID_PRIVATE_PEM
 
 except Exception as e:
     logger.error(f'Could not load or generate VAPID keys: {e}')