def authenticate_google():
creds = None
if os.path.exists('token.pickle'):
with open('token.pickle', 'rb') as token:
creds = pickle.load(token)
# if there are no (valid) credentials available, let the user log in.
if not creds or not creds.valid:
if creds and creds.expired and creds.refresh_token():
creds.refresh(Request())
else:
flow = InstalledAppFlow.from_client_secrects_file(
'credentials.json', SCOPES)
creds = flow.run_local_server(port=0)
# save the credentials for the next run
with open('token.pickle', 'wb') as token:
pickle.dump(creds, token)
service = build('calendar', 'v3', credentials=creds)
return service
