service_account.py 文件源码

def from_json_keyfile_name(cls, filename, scopes=''):
        """Factory constructor from JSON keyfile by name.

        Args:
            filename: string, The location of the keyfile.
            scopes: List or string, (Optional) Scopes to use when acquiring an
                    access token.

        Returns:
            ServiceAccountCredentials, a credentials object created from
            the keyfile.

        Raises:
            ValueError, if the credential type is not :data:`SERVICE_ACCOUNT`.
            KeyError, if one of the expected keys is not present in
                the keyfile.
        """
        with open(filename, 'r') as file_obj:
            client_credentials = json.load(file_obj)
        return cls._from_parsed_json_keyfile(client_credentials, scopes)