SwitchBackUserHook.php

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

use TYPO3\CMS\Core\Authentication\AbstractUserAuthentication;

class SwitchBackUserHook {

    public function switchBack($params, AbstractUserAuthentication $authentication) {
        if ($this->isAHandledBackendSession($authentication)) {
            $objectManager = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Extbase\\Object\\ObjectManager');
            $backendUserSessionRepository = $objectManager->get('TYPO3\\CMS\\Beuser\\Domain\\Repository\\BackendUserSessionRepository');
            $backendUserSessionRepository->switchBackToOriginalUser($authentication);
            \TYPO3\CMS\Core\Utility\HttpUtility::redirect($GLOBALS['BACK_PATH'] . 'backend.php');
        }
    }

    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;
        }
    }

}