def _on_auth(self, user):
        if not user:
            self.abort(403)
            return

        auth_id = 'google|%s' % user['email']

        store = MultiAuthStore(self)

        store.login_with_auth_id(auth_id, remember=True)

        # check if this user is registered
        # with us or not, if not then we will create
        # an entry for him

        if store.user is None:
        user = self.auth.create_user(username=user['email'],auth_id=auth_id)

        return self._on_auth_redirect()