Move function:NormalizeDomain to netutils module

src/mod/acme/acme.go

@@ -27,6 +27,7 @@ import (
 	"github.com/go-acme/lego/v4/registration"
 	"imuslab.com/zoraxy/mod/database"
 	"imuslab.com/zoraxy/mod/info/logger"
+	"imuslab.com/zoraxy/mod/netutils"
 	"imuslab.com/zoraxy/mod/utils"
 )
 
@@ -438,7 +439,7 @@ func (a *ACMEHandler) HandleRenewCertificate(w http.ResponseWriter, r *http.Requ
 	if domainPara != "" {
 		for _, d := range strings.Split(domainPara, ",") {
 			// Apply normalization on each domain
-			nd, err := utils.NormalizeDomain(d)
+			nd, err := netutils.NormalizeDomain(d)
 			if err != nil {
 				utils.SendErrorResponse(w, jsonEscape(err.Error()))
 				return

src/mod/netutils/netutils.go

@@ -2,10 +2,13 @@ package netutils
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"net"
 	"net/http"
 	"strconv"
+	"strings"
+	"unicode"
 
 	"github.com/likexian/whois"
 	"imuslab.com/zoraxy/mod/utils"
@@ -167,3 +170,53 @@ func CheckIfPortOccupied(portNumber int) bool {
 	listener.Close()
 	return false
 }
+
+// NormalizeDomain cleans and validates a domain string.
+// - Trims spaces around the domain
+// - Converts to lowercase
+// - Removes trailing dot (FQDN canonicalization)
+// - Checks that the domain conforms to standard rules:
+//   - Each label ≤ 63 characters
+//   - Only letters, digits, and hyphens
+//   - Labels do not start or end with a hyphen
+//   - Full domain ≤ 253 characters
+//
+// Returns an empty string if the domain is invalid.
+func NormalizeDomain(d string) (string, error) {
+	d = strings.TrimSpace(d)
+	d = strings.ToLower(d)
+	d = strings.TrimSuffix(d, ".")
+
+	if len(d) == 0 {
+		return "", errors.New("domain is empty")
+	}
+	if len(d) > 253 {
+		return "", errors.New("domain exceeds 253 characters")
+	}
+
+	labels := strings.Split(d, ".")
+	for index, label := range labels {
+		if index == 0 {
+			if len(label) == 1 && label == "*" {
+				continue
+			}
+		}
+		if len(label) == 0 {
+			return "", errors.New("Domain '" + d + "' not valid: Empty label")
+		}
+		if len(label) > 63 {
+			return "", errors.New("Domain not valid: label exceeds 63 characters")
+		}
+
+		for i, r := range label {
+			if !unicode.IsLetter(r) && !unicode.IsDigit(r) && r != '-' {
+				return "", errors.New("Domain '" + d + "' not valid: Invalid character '" + string(r) + "' in label")
+			}
+			if (i == 0 || i == len(label)-1) && r == '-' {
+				return "", errors.New("Domain '" + d + "' not valid: label '" + label + "' starts or ends with hyphen")
+			}
+		}
+	}
+
+	return d, nil
+}

src/mod/utils/utils.go

@@ -9,7 +9,6 @@ import (
 	"strconv"
 	"strings"
 	"time"
-	"unicode"
 )
 
 /*
@@ -201,53 +200,3 @@ func ValidateListeningAddress(address string) bool {
 
 	return true
 }
-
-// NormalizeDomain cleans and validates a domain string.
-// - Trims spaces around the domain
-// - Converts to lowercase
-// - Removes trailing dot (FQDN canonicalization)
-// - Checks that the domain conforms to standard rules:
-//   - Each label ≤ 63 characters
-//   - Only letters, digits, and hyphens
-//   - Labels do not start or end with a hyphen
-//   - Full domain ≤ 253 characters
-//
-// Returns an empty string if the domain is invalid.
-func NormalizeDomain(d string) (string, error) {
-	d = strings.TrimSpace(d)
-	d = strings.ToLower(d)
-	d = strings.TrimSuffix(d, ".")
-
-	if len(d) == 0 {
-		return "", errors.New("domain is empty")
-	}
-	if len(d) > 253 {
-		return "", errors.New("domain exceeds 253 characters")
-	}
-
-	labels := strings.Split(d, ".")
-	for index, label := range labels {
-		if index == 0 {
-			if len(label) == 1 && label == "*" {
-				continue
-			}
-		}
-		if len(label) == 0 {
-			return "", errors.New("Domain '" + d + "' not valid: Empty label")
-		}
-		if len(label) > 63 {
-			return "", errors.New("Domain not valid: label exceeds 63 characters")
-		}
-
-		for i, r := range label {
-			if !unicode.IsLetter(r) && !unicode.IsDigit(r) && r != '-' {
-				return "", errors.New("Domain '" + d + "' not valid: Invalid character '" + string(r) + "' in label")
-			}
-			if (i == 0 || i == len(label)-1) && r == '-' {
-				return "", errors.New("Domain '" + d + "' not valid: label '" + label + "' starts or ends with hyphen")
-			}
-		}
-	}
-
-	return d, nil
-}