PreviewSimulator.php

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<?php
declare(strict_types = 1);
 
namespace ‪TYPO3\CMS\Frontend\Middleware;
 
/*
 * 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 Psr\Http\Server\MiddlewareInterface;
use Psr\Http\Server\RequestHandlerInterface;
use ‪TYPO3\CMS\Core\Context\Context;
use ‪TYPO3\CMS\Core\Context\DateTimeAspect;
use ‪TYPO3\CMS\Core\Context\UserAspect;
use ‪TYPO3\CMS\Core\Utility\GeneralUtility;
 
class ‪PreviewSimulator implements MiddlewareInterface
{
    private ‪$context;
 
    public function ‪__construct()
    {
        $this->context = GeneralUtility::makeInstance(Context::class);
    }
 
    public function ‪process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
    {
        if ((bool)$this->context->getPropertyFromAspect('backend.user', 'isLoggedIn', false)) {
            $simulatingDate = $this->‪simulateDate($request);
            $simulatingGroup = $this->‪simulateUserGroup($request);
            $showHiddenRecords = ($this->context->hasAspect('visibility') ? $this->context->getAspect('visibility')->includeHidden() : false);
            ‪$GLOBALS['TSFE']->fePreview = ($simulatingDate || $simulatingGroup || $showHiddenRecords);
        }
 
        return $handler->handle($request);
    }
 
    protected function ‪simulateDate(ServerRequestInterface $request): bool
    {
        $simulatedDate = null;
        $queryTime = $request->getQueryParams()['ADMCMD_simTime'] ?? false;
        if (!$queryTime) {
            return false;
        }
 
        $simulatedDate = new \DateTimeImmutable('@' . $queryTime);
        if (!$simulatedDate) {
            return false;
        }
 
        ‪$GLOBALS['SIM_EXEC_TIME'] = $queryTime;
        ‪$GLOBALS['SIM_ACCESS_TIME'] = $queryTime - $queryTime % 60;
        $this->context->setAspect(
            'date',
            GeneralUtility::makeInstance(
                DateTimeAspect::class,
                $simulatedDate
            )
        );
        return true;
    }
 
    protected function ‪simulateUserGroup(ServerRequestInterface $request): bool
    {
        $simulateUserGroup = (int)($request->getQueryParams()['ADMCMD_simUser'] ?? 0);
        if (!$simulateUserGroup) {
            return false;
        }
 
        $frontendUser = ‪$GLOBALS['TSFE']->fe_user;
        $frontendUser->user[$frontendUser->usergroup_column] = $simulateUserGroup;
        // let's fake having a user with that group, too
        $frontendUser->user['uid'] = PHP_INT_MAX;
        $this->context->setAspect(
            'frontend.user',
            GeneralUtility::makeInstance(
                UserAspect::class,
                $frontendUser,
                [$simulateUserGroup]
            )
        );
        return true;
    }
}