LogoutController.php

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<?php
namespace TYPO3\CMS\Backend\Controller;

/*
 * 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 Psr\Http\Message\ServerRequestInterface;
use TYPO3\CMS\Core\FormProtection\FormProtectionFactory;
use TYPO3\CMS\Core\Utility\GeneralUtility;

class LogoutController
{
    public function logoutAction(ServerRequestInterface $request, ResponseInterface $response)
    {
        $this->logout();

        $redirectUrl = isset($request->getParsedBody()['redirect']) ? $request->getParsedBody()['redirect'] : $request->getQueryParams()['redirect'];
        $redirectUrl = GeneralUtility::sanitizeLocalUrl($redirectUrl);
        if (empty($redirectUrl)) {
            $uriBuilder = GeneralUtility::makeInstance(\TYPO3\CMS\Backend\Routing\UriBuilder::class);
            $redirectUrl = (string)$uriBuilder->buildUriFromRoute('login', [], $uriBuilder::ABSOLUTE_URL);
        }
        return $response
            ->withStatus(303)
            ->withHeader('Location', GeneralUtility::locationHeaderUrl($redirectUrl));
    }

    public function logout()
    {
        if (empty($this->getBackendUser()->user['username'])) {
            return;
        }
        // Logout written to log
        $this->getBackendUser()->writelog(255, 2, 0, 1, 'User %s logged out from TYPO3 Backend', [$this->getBackendUser()->user['username']]);
        $backendFormProtection = FormProtectionFactory::get();
        $backendFormProtection->removeSessionTokenFromRegistry();
        $this->getBackendUser()->logoff();
    }

    protected function getBackendUser()
    {
        return $GLOBALS['BE_USER'];
    }
}