LogoutController.php

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<?php
 
declare(strict_types=1);
 
/*
 * 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!
 */
 
namespace ‪TYPO3\CMS\Backend\Controller;
 
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use ‪TYPO3\CMS\Backend\Routing\UriBuilder;
use ‪TYPO3\CMS\Core\FormProtection\BackendFormProtection;
use ‪TYPO3\CMS\Core\FormProtection\FormProtectionFactory;
use ‪TYPO3\CMS\Core\Http\RedirectResponse;
use ‪TYPO3\CMS\Core\SysLog\Action\Login as SystemLogLoginAction;
use ‪TYPO3\CMS\Core\SysLog\Error as SystemLogErrorClassification;
use ‪TYPO3\CMS\Core\SysLog\Type as SystemLogType;
use ‪TYPO3\CMS\Core\Utility\GeneralUtility;
 
class ‪LogoutController
{
    public function ‪logoutAction(ServerRequestInterface $request): ResponseInterface
    {
        $this->‪processLogout();
 
        $redirectUrl = $request->getParsedBody()['redirect'] ?? $request->getQueryParams()['redirect'] ?? '';
        $redirectUrl = GeneralUtility::sanitizeLocalUrl($redirectUrl);
        if (empty($redirectUrl)) {
            $uriBuilder = GeneralUtility::makeInstance(UriBuilder::class);
            $redirectUrl = (string)$uriBuilder->buildUriFromRoute('login', [], $uriBuilder::ABSOLUTE_URL);
        }
        return new ‪RedirectResponse(GeneralUtility::locationHeaderUrl($redirectUrl), 303);
    }
 
    protected function ‪processLogout(): void
    {
        if (empty($this->‪getBackendUser()->user['username'])) {
            return;
        }
        // Logout written to log
        $this->‪getBackendUser()->‪writelog(SystemLogType::LOGIN, SystemLogLoginAction::LOGOUT, SystemLogErrorClassification::MESSAGE, 1, 'User %s logged out from TYPO3 Backend', [$this->‪getBackendUser()->user['username']]);
        $backendFormProtection = ‪FormProtectionFactory::get();
        $backendFormProtection->removeSessionTokenFromRegistry();
        $this->‪getBackendUser()->‪logoff();
    }
 
    protected function ‪getBackendUser()
    {
        return ‪$GLOBALS['BE_USER'];
    }
}