fix domain handling

Author: deer-wmde

app/Helper/DomainHelper.php

@@ -17,23 +17,19 @@
 class DomainHelper {
     // @return string - the domain name encoded in ASCII-compatible form
     public static function encode($string) {
-        $result = idn_to_ascii($string);
-
-        // return the original input if encoding failed
-        if ($result === false) {
-            $result = $string;
+        $result = $string;
+        if (!empty($string)) {
+            $result = idn_to_ascii($string);
         }
 
         return $result;
     }
 
     // @return string - the domain name in Unicode, encoded in UTF-8
     public static function decode($string) {
-        $result = idn_to_utf8($string);
-
-        // return the original input if decoding failed
-        if ($result === false) {
-            $result = $string;
+        $result = $string;
+        if (!empty($string)) {
+            $result = idn_to_utf8($string);
         }
 
         return $result;

app/Http/Controllers/WikiController.php

@@ -51,6 +51,7 @@ public function create(Request $request): Response {
 
         // TODO extra validation that username is correct?
         $request->validate([
+            'domain' => 'required',
             'sitename' => 'required|min:3',
             'username' => 'required',
             'profile' => 'nullable|json',