feat: referrer finisher adds current page url to sent form

public/typo3conf/ext/ep_theme/Classes/Form/AddReferrerFinisher.php

@@ -2,11 +2,19 @@
 
 namespace EP\EpTheme\Form;
 
+use TYPO3\CMS\Core\Site\SiteFinder;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
 use TYPO3\CMS\Form\Domain\Finishers\AbstractFinisher;
 
 class AddReferrerFinisher extends AbstractFinisher
 {
     protected function executeInternal()
+    {
+        $this->addCurrentUrlField();
+        $this->addReferrerField();
+    }
+
+    private function addReferrerField(): void
     {
         // Look for key 'referrer' in frontend session
         $referrer = $GLOBALS['TSFE']->fe_user->getKey('ses', 'referrer');
@@ -37,4 +45,30 @@ class AddReferrerFinisher extends AbstractFinisher
         $GLOBALS['TSFE']->fe_user->setKey('ses', 'referrer', null);
         $GLOBALS['TSFE']->fe_user->storeSessionData();
     }
+
+    private function addCurrentUrlField(): void
+    {
+        // Get URL of current page
+        $pageId = $GLOBALS['TSFE']->id;
+        $site = GeneralUtility::makeInstance(SiteFinder::class)->getSiteByPageId($pageId);
+        $url = $site->getRouter()->generateUri($pageId);
+
+        // Add textfield to form containing url value
+        $field = $this->finisherContext
+            ->getFormRuntime()
+            ->getFormDefinition()
+            ->getPageByIndex(0)
+            ->createElement('pageurl', 'Text');
+
+        $field->setDefaultValue($url);
+        $field->setDataType('string');
+        $field->setLabel('URL');
+
+        // Add finisher variable for potential later use
+        $this->finisherContext->getFinisherVariableProvider()->add(
+            $this->shortFinisherIdentifier,
+            'pageurl',
+            $url
+        );
+    }
 }