from nova.api.openstack import extensions


ALIAS = "os-user-data"
ATTRIBUTE_NAME = '%s:user_data' % ALIAS


class UserData(extensions.V3APIExtensionBase):
    """Add user_data to the Create Server v1.1 API."""

    name = "UserData"
    alias = "os-user-data"
    namespace = ("http://docs.openstack.org/compute/ext/"
                 "userdata/api/v3")
    version = 1

    def get_controller_extensions(self):
        return []

    def get_resources(self):
        return []

    def server_create(self, server_dict, create_kwargs):
        create_kwargs['user_data'] = server_dict.get(ATTRIBUTE_NAME)

    def server_xml_extract_server_deserialize(self, server_node, server_dict):
        user_data = server_node.getAttribute(ATTRIBUTE_NAME)
        if user_data:
            server_dict[ATTRIBUTE_NAME] = user_data
