code: def _get_storage_model():
      
      storage_model_settings = getattr(django.conf.settings,
                                       'GOOGLE_OAUTH2_STORAGE_MODEL', None)
      if storage_model_settings is not None:
          return (storage_model_settings['model'],
                  storage_model_settings['user_property'],
                  storage_model_settings['credentials_property'])
      else:
          return None, None, None
docs: This configures whether the credentials will be stored in the session
      or the Django ORM based on the settings. By default, the credentials
      will be stored in the session, unless `GOOGLE_OAUTH2_STORAGE_MODEL`
      is found in the settings. Usually, the ORM storage is used to integrate
      credentials into an existing Django user system.
  
      Returns:
          A tuple containing three strings, or None. If
          ``GOOGLE_OAUTH2_STORAGE_MODEL`` is configured, the tuple
          will contain the fully qualifed path of the `django.db.model`,
          the name of the ``django.contrib.auth.models.User`` field on the
          model, and the name of the
          :class:`oauth2client.contrib.django_util.models.CredentialsField`
          field on the model. If Django ORM storage is not configured,
          this function returns None.