BackendUserHandler.php

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<?php
namespace TYPO3\CMS\Core\Tests\Functional\Framework\Frontend\Hook;

use \TYPO3\CMS\Core\Utility\GeneralUtility;

class BackendUserHandler implements \TYPO3\CMS\Core\SingletonInterface {

    public function initialize(array $parameters, \TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController $frontendController) {
        $backendUserId = (int)GeneralUtility::_GP('backendUserId');
        $workspaceId = (int)GeneralUtility::_GP('workspaceId');

        if (empty($backendUserId) || empty($workspaceId)) {
            return;
        }

        $backendUser = $this->createBackendUser();
        $backendUser->user = $this->getDatabaseConnection()->exec_SELECTgetSingleRow('*', 'be_users', 'uid=' . $backendUserId);
        $backendUser->setTemporaryWorkspace($workspaceId);
        $frontendController->beUserLogin = TRUE;

        $parameters['BE_USER'] = $backendUser;
        $GLOBALS['BE_USER'] = $backendUser;
    }

    protected function createBackendUser() {
        return GeneralUtility::makeInstance(
            'TYPO3\\CMS\\Backend\\FrontendBackendUserAuthentication'
        );
    }

    protected function getDatabaseConnection() {
        return $GLOBALS['TYPO3_DB'];
    }

}