Fix backend survey frontend URL generation

src/EventListener/SurveyDcaListener.php

@@ -5,9 +5,9 @@ declare(strict_types=1);
 namespace Mummert\SurveyBundle\EventListener;
 
 use Contao\Config;
+use Contao\CoreBundle\Routing\ContentUrlGenerator;
 use Contao\CoreBundle\Framework\ContaoFramework;
 use Contao\DataContainer;
-use Contao\Environment;
 use Contao\Image;
 use Contao\Input;
 use Contao\PageModel;
@@ -16,6 +16,7 @@ use Mummert\SurveyBundle\Repository\SurveyEditorRepository;
 use Mummert\SurveyBundle\Repository\SurveyQuestionRepository;
 use Mummert\SurveyBundle\Repository\SurveyRepository;
 use Mummert\SurveyBundle\Service\SurveyCategoryAssignmentService;
+use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
 
 final class SurveyDcaListener
 {
@@ -26,6 +27,7 @@ final class SurveyDcaListener
         private readonly SurveyCategoryAssignmentService $surveyCategoryAssignmentService,
         private readonly ContaoFramework $framework,
         private readonly Connection $connection,
+        private readonly ContentUrlGenerator $contentUrlGenerator,
     ) {
     }
 
@@ -462,14 +464,15 @@ final class SurveyDcaListener
             return null;
         }
 
-        $baseUrl = rtrim((string) $this->framework->getAdapter(Environment::class)->get('url'), '/');
-        $pagePath = trim((string) $page->getFrontendUrl(), '/');
-
-        if ('' === $pagePath) {
-            return sprintf('%s/%s', $baseUrl, $alias);
+        try {
+            return $this->contentUrlGenerator->generate(
+                $page,
+                ['parameters' => '/'.$alias],
+                UrlGeneratorInterface::ABSOLUTE_URL,
+            );
+        } catch (\Throwable) {
+            return null;
         }
-
-        return sprintf('%s/%s/%s', $baseUrl, $pagePath, $alias);
     }
 
     private function resolvePageId(string $settingKey): int