fix-username validation (goharbor#265)

Signed-off-by: bupd <bupdprasanth@gmail.com>
Signed-off-by: Patrick Eschenbach <patrickeschenbach96@gmail.com>

pkg/utils/helper.go

@@ -44,10 +44,10 @@ func FormatSize(size int64) string {
 	return fmt.Sprintf("%.2fMiB", mbSize)
 }
 
+// ValidateUserName checks if the username is valid by length and allowed characters.
 func ValidateUserName(username string) bool {
-	pattern := `^[a-zA-Z0-9]{1,255}$`
-	re := regexp.MustCompile(pattern)
-	return re.MatchString(username)
+	username = strings.TrimSpace(username)
+	return len(username) >= 1 && len(username) <= 255 && !strings.ContainsAny(username, `,"~#%$`)
 }
 
 func ValidateEmail(email string) bool {