def _get_storage_model():
storage_model_settings = getattr(django.conf.settings,<EOL>'<STR_LIT>', None)<EOL>if storage_model_settings is not None:<EOL><INDENT>return (storage_model_settings['<STR_LIT>'],<EOL>storage_model_settings['<STR_LIT>'],<EOL>storage_model_settings['<STR_LIT>'])<EOL><DEDENT>else:<EOL><INDENT>return None, None, None<EOL><DEDENT>
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.