SwitchBackUserHook.php

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<?php
namespace TYPO3\CMS\Beuser\Hook;

/*
 * 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\Authentication\AbstractUserAuthentication;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Core\Utility\HttpUtility;

class SwitchBackUserHook
{
    public function switchBack($params, AbstractUserAuthentication $authentication)
    {
        if ($this->isAHandledBackendSession($authentication)) {
            $objectManager = GeneralUtility::makeInstance(\TYPO3\CMS\Extbase\Object\ObjectManager::class);
            $backendUserSessionRepository = $objectManager->get(\TYPO3\CMS\Beuser\Domain\Repository\BackendUserSessionRepository::class);
            $backendUserSessionRepository->switchBackToOriginalUser($authentication);
            HttpUtility::redirect(\TYPO3\CMS\Backend\Utility\BackendUtility::getModuleUrl('main'));
        }
    }

    protected function isAHandledBackendSession(AbstractUserAuthentication $authentication)
    {
        if (
            $authentication->session_table !== 'be_sessions'
            || !is_array($authentication->user)
            || !$authentication->user['uid']
            || !$authentication->user['ses_backuserid']
        ) {
            return false;
        } else {
            return true;
        }
    }
}