fixed key to one line

app.py

@@ -42,7 +42,7 @@ class FlicButtonHandler:
         }
         
         # Ensure subscriptions file and directory exist
-        self.subscriptions_file = os.getenv('SUBSCRIPTIONS_FILE', '/app/subscriptions.json')
+        self.subscriptions_file = os.getenv('SUBSCRIPTIONS_FILE', 'app/subscriptions.json')
         self._ensure_subscriptions_file()
         
         # Load subscriptions
@@ -70,26 +70,30 @@ class FlicButtonHandler:
 
     def _decode_vapid_private_key(self):
         """
-        Decode and load the VAPID private key from base64 encoded string.
-        Returns the PEM-formatted private key as a string.
+        Load the VAPID private key from environment variable.
+        Handles the \n escaped format from .env file.
         """
         try:
-            # Decode base64 private key
-            private_key_pem = base64.urlsafe_b64decode(
-                os.getenv('VAPID_PRIVATE_KEY', '').encode('utf-8')
-            )
+            # Get the key from environment
+            env_key = os.getenv('VAPID_PRIVATE_KEY', '').strip()
             
-            # Load private key to validate it
-            private_key = serialization.load_pem_private_key(
-                private_key_pem, 
+            # Convert escaped newlines back to actual newlines
+            private_pem = env_key.replace('\\n', '\n')
+            
+            # Verify PEM format
+            if not private_pem.startswith('-----BEGIN PRIVATE KEY-----'):
+                raise ValueError("Invalid PEM format")
+                
+            # Validate the key
+            serialization.load_pem_private_key(
+                private_pem.encode('utf-8'),
                 password=None
             )
             
-            # Return the original PEM string (pywebpush needs this format)
-            return private_key_pem.decode('utf-8')
+            return private_pem
             
         except Exception as e:
-            logger.error(f"Error loading VAPID private key: {e}")
+            logger.error(f"VAPID key error: {str(e)}")
             raise
 
     def load_subscriptions(self) -> List[Dict]: