code: def is_active(cache, token):
      
      profile = cache.get(token)
      if not profile:
          raise exceptions.NotAuthenticatedException(
              'The token is good, but you are not logged in. Please '
              'try logging in again.')
      return profile
docs: Accepts the cache and ID token and checks to see if the profile is
      currently logged in. If so, return the token, otherwise throw a
      NotAuthenticatedException.
      :param cache:
      :param token:
      :return: