def _create_secret_ref(self, key_id):
        """Creates the URL required for accessing a secret.

        :param key_id: the UUID of the key to copy

        :return: the URL of the requested secret
        """
        if not key_id:
            msg = "Key ID is None"
            raise exception.KeyManagerError(msg)
        return self._base_url + "/secrets/" + key_id
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/keymgr/barbican.py/BarbicanKeyManager._create_secret_ref/original