def get_upload_url(self, expiration_time, object_name):
    """
    Get a presigned url to upload an object
    :param expiration_time:
    :param object_name:
    :return: url as string of the presigned url
    """
    try:
        key_prefix = str(uuid.uuid4())
        return self.__generate_pre_signed_url(
            expiration_time, object_name, key_prefix, "put_object"
        )
    except ClientError as client_error:
        logger.exception(
            NOT_AVAILABLE, client_error,
        )
        raise InternalServerError(NOT_AVAILABLE)