// Its valid to have a empty prefix.
func IsValidObjectPrefix(object string) bool {
	if hasBadPathComponent(object) {
		return false
	}
	if !utf8.ValidString(object) {
		return false
	}
	if strings.Contains(object, `//`) {
		return false
	}
	// This is valid for AWS S3 but it will never
	// work with file systems, we will reject here

	if !exists && hasSpaceBE(accessKey) {
		writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrAdminResourceInvalidArgument), r.URL)
		return
	}

	if !utf8.ValidString(accessKey) {
		writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrAddUserValidUTF), r.URL)
		return
	}

	checkDenyOnly := accessKey == cred.AccessKey

	if !globalIAMSys.IsAllowed(policy.Args{