Update calendar registration to use modern OAuth flow with local server callback

calendar_registration.py

@@ -5,6 +5,11 @@ from google_auth_oauthlib.flow import InstalledAppFlow
 from google.oauth2.credentials import Credentials
 from google.auth.transport.requests import Request
 import pickle
+import webbrowser
+from http.server import HTTPServer, BaseHTTPRequestHandler
+import threading
+import urllib.parse
+import socket
 
 # If modifying these scopes, delete the file token.pickle.
 SCOPES = ['https://www.googleapis.com/auth/calendar.readonly']
@@ -18,6 +23,32 @@ def save_credentials(creds, token_path):
     with open(token_path, 'wb') as token:
         pickle.dump(creds, token)
 
+class OAuthHandler(BaseHTTPRequestHandler):
+    def do_GET(self):
+        # Parse the query parameters
+        query_components = urllib.parse.parse_qs(urllib.parse.urlparse(self.path).query)
+        
+        if 'code' in query_components:
+            # Store the authorization code
+            self.server.auth_code = query_components['code'][0]
+            
+            # Send success response to browser
+            self.send_response(200)
+            self.send_header('Content-type', 'text/html')
+            self.end_headers()
+            self.wfile.write(b"Authorization successful! You can close this window.")
+        else:
+            # Send error response
+            self.send_response(400)
+            self.send_header('Content-type', 'text/html')
+            self.end_headers()
+            self.wfile.write(b"Authorization failed! Please try again.")
+
+def get_free_port():
+    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
+        s.bind(('', 0))
+        return s.getsockname()[1]
+
 def main():
     config = load_config()
     calendar_config = config.get('calendar', {})
@@ -41,29 +72,44 @@ def main():
         print("1. Go to https://console.cloud.google.com")
         print("2. Create a project or select existing project")
         print("3. Enable the Google Calendar API")
-        print("4. Configure the OAuth consent screen (select TV and Limited Input Device)")
-        print("5. Create OAuth 2.0 credentials")
+        print("4. Configure the OAuth consent screen")
+        print("5. Create OAuth 2.0 credentials (Desktop application)")
         print("6. Download the credentials and save as credentials.json")
         return
 
+    # Get a free port for the local server
+    port = get_free_port()
+    redirect_uri = f'http://localhost:{port}'
+
     # Create the flow using the client secrets file from the Google API Console
     flow = InstalledAppFlow.from_client_secrets_file(
         creds_file, SCOPES,
-        # Specify TV and Limited Input Device flow
-        redirect_uri='urn:ietf:wg:oauth:2.0:oob'
+        redirect_uri=redirect_uri
     )
 
+    # Start local server to receive the OAuth callback
+    server = HTTPServer(('localhost', port), OAuthHandler)
+    server.auth_code = None
+    server_thread = threading.Thread(target=server.serve_forever)
+    server_thread.daemon = True
+    server_thread.start()
+
     # Generate URL for authorization
     auth_url, _ = flow.authorization_url(prompt='consent')
     
-    print("\nPlease visit this URL to authorize this application:")
-    print(auth_url)
-    print("\nAfter authorizing, you will receive a code. Enter that code below:")
+    print("\nOpening your browser to authorize this application...")
+    webbrowser.open(auth_url)
     
-    code = input("Enter the authorization code: ")
+    print("\nWaiting for authorization...")
+    while server.auth_code is None:
+        pass
+    
+    # Stop the server
+    server.shutdown()
+    server.server_close()
     
     # Exchange the authorization code for credentials
-    flow.fetch_token(code=code)
+    flow.fetch_token(code=server.auth_code)
     creds = flow.credentials
 
     # Save the credentials