fetch_credentials.py 文件源码

def update_credentials(self):
        """Gets valid user credentials from Gmail using Oauth 2.0

        Returns:
            Credentials, the obtained credential.
        """

        if not os.path.exists(self._config['credentials_dir']):
            os.makedirs(self._config['credentials_dir'])

        store = Storage(self._credentials_file)
        credentials = store.get()
        if not credentials or credentials.invalid:
            flow = client.flow_from_clientsecrets(self._client_secret_file,
                                                  self._config['oauth2_scopes'])
            flow.user_agent = self._config['application_name']
            credentials = tools.run_flow(flow, store, self._oauth2_flags)
            self._logger.info('Storing credentials to ' + self._credentials_file)
        else:
            self._logger.info("Credentials exist.")
        return credentials