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typo3/sysext/frontend/Classes/Page/ExternalPageUrlHandler.php

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+<?php
+declare(strict_types = 1);
+namespace TYPO3\CMS\Frontend\Page;
+
+/*
+ * This file is part of the TYPO3 CMS project.
+ *
+ * It is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, either version 2
+ * of the License, or any later version.
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE.txt file that was distributed with this source code.
+ *
+ * The TYPO3 project - inspiring people to share!
+ */
+
+use Psr\Http\Message\ResponseInterface;
+use TYPO3\CMS\Core\Http\RedirectResponse;
+use TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController;
+
+/**
+ * Handles the redirection for external URL pages.
+ * @deprecated since TYPO3 v9.3, will be removed in TYPO3 v10.0. The functionality has been moved into a PSR-15 middleware.
+ */
+class ExternalPageUrlHandler implements \TYPO3\CMS\Frontend\Http\UrlHandlerInterface
+{
+    /**
+     * @var string
+     */
+    protected $externalUrl = '';
+
+    public function __construct()
+    {
+        trigger_error('ExternalPageUrlHandler has been moved into a PSR-15 middleware and will be removed in TYPO3 v10.0. In order to modify the external page redirection, use a PSR-15 middleware as well.', E_USER_DEPRECATED);
+    }
+
+    /**
+     * Checks if external URLs are enabled and if the current page points to an external URL.
+     *
+     * @return bool
+     */
+    public function canHandleCurrentUrl(): bool
+    {
+        $tsfe = $this->getTypoScriptFrontendController();
+
+        if (!empty($tsfe->config['config']['disablePageExternalUrl'])) {
+            return false;
+        }
+
+        $this->externalUrl = $tsfe->sys_page->getExtURL($tsfe->page);
+        if (empty($this->externalUrl)) {
+            return false;
+        }
+        return true;
+    }
+
+    /**
+     * Redirects the user to the detected external URL.
+     */
+    public function handle(): ResponseInterface
+    {
+        return new RedirectResponse($this->externalUrl, 303);
+    }
+
+    /**
+     * @return TypoScriptFrontendController
+     */
+    protected function getTypoScriptFrontendController(): TypoScriptFrontendController
+    {
+        return $GLOBALS['TSFE'];
+    }
+}