ExternalPageUrlHandler.php

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<?php
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 TYPO3\CMS\Core\Utility\HttpUtility;

class ExternalPageUrlHandler implements \TYPO3\CMS\Frontend\Http\UrlHandlerInterface
{
    protected $externalUrl = '';

    public function canHandleCurrentUrl()
    {
        $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;
        } else {
            return true;
        }
    }

    public function handle()
    {
        HttpUtility::redirect($this->externalUrl, HttpUtility::HTTP_STATUS_303);
    }

    protected function getTypoScriptFrontendController()
    {
        return $GLOBALS['TSFE'];
    }
}