[TASK] Add additional checks

Author: georgringer

Classes/Controller/AjaxController.php

@@ -8,6 +8,7 @@
 use Psr\Http\Message\ServerRequestInterface;
 use TYPO3\CMS\Core\Http\JsonResponse;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
+use TYPO3\CMS\Core\Utility\StringUtility;
 
 class AjaxController
 {
@@ -18,15 +19,17 @@ public function checkAction(ServerRequestInterface $request): JsonResponse
         $response = [];
         $parser = GeneralUtility::makeInstance(UrlParser::class);
 
-        try {
-            $newValue = $parser->parse($uri);
-            if ($newValue !== $uri) {
-                $response['transformed'] = $newValue;
-                $response['status'] = true;
+        if (is_string($uri) && !empty($uri) && (StringUtility::beginsWith($uri, 'http') || StringUtility::beginsWith($uri, '/'))) {
+            try {
+                $newValue = $parser->parse($uri);
+                if ($newValue !== $uri) {
+                    $response['transformed'] = $newValue;
+                    $response['status'] = true;
+                }
+            } catch (\Exception $exception) {
+                $response['false'] = true;
+                $response['message'] = $exception->getMessage();
             }
-        } catch (\Exception $exception) {
-            $response['false'] = true;
-            $response['message'] = $exception->getMessage();
         }
         return new JsonResponse($response);
     }