}

	if parentUser == "" {
		return auth.Credentials{}, time.Time{}, errInvalidArgument
	}

	if len(opts.accessKey) > 0 && len(opts.secretKey) == 0 {
		return auth.Credentials{}, time.Time{}, auth.ErrNoSecretKeyWithAccessKey
	}
	if len(opts.secretKey) > 0 && len(opts.accessKey) == 0 {
		return auth.Credentials{}, time.Time{}, auth.ErrNoAccessKeyWithSecretKey
	}