service_account.py 文件源码

def _from_parsed_json_keyfile(cls, keyfile_dict, scopes):
        """Helper for factory constructors from JSON keyfile.

        Args:
            keyfile_dict: dict-like object, The parsed dictionary-like object
                          containing the contents of the JSON keyfile.
            scopes: List or string, Scopes to use when acquiring an
                    access token.

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

        Raises:
            ValueError, if the credential type is not :data:`SERVICE_ACCOUNT`.
            KeyError, if one of the expected keys is not present in
                the keyfile.
        """
        creds_type = keyfile_dict.get('type')
        if creds_type != SERVICE_ACCOUNT:
            raise ValueError('Unexpected credentials type', creds_type,
                             'Expected', SERVICE_ACCOUNT)

        service_account_email = keyfile_dict['client_email']
        private_key_pkcs8_pem = keyfile_dict['private_key']
        private_key_id = keyfile_dict['private_key_id']
        client_id = keyfile_dict['client_id']

        signer = crypt.Signer.from_string(private_key_pkcs8_pem)
        credentials = cls(service_account_email, signer, scopes=scopes,
                          private_key_id=private_key_id,
                          client_id=client_id)
        credentials._private_key_pkcs8_pem = private_key_pkcs8_pem
        return credentials