rest_api.py 文件源码

def _make_token_async(scopes, service_account_id):
  """Get a fresh authentication token.

  Args:
    scopes: A list of scopes.
    service_account_id: Internal-use only.

  Raises:
    An ndb.Return with a tuple (token, expiration_time) where expiration_time is
    seconds since the epoch.
  """
  rpc = app_identity.create_rpc()
  app_identity.make_get_access_token_call(rpc, scopes, service_account_id)
  token, expires_at = yield rpc
  raise ndb.Return((token, expires_at))