AdminPanelRenderer.php

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<?php
 
declare(strict_types=1);
 
/*
 * 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!
 */
 
namespace ‪TYPO3\CMS\Adminpanel\Middleware;
 
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\MiddlewareInterface;
use Psr\Http\Server\RequestHandlerInterface;
use ‪TYPO3\CMS\Adminpanel\Controller\MainController;
use ‪TYPO3\CMS\Adminpanel\Utility\StateUtility;
use ‪TYPO3\CMS\Core\Http\NullResponse;
use ‪TYPO3\CMS\Core\Http\Stream;
use ‪TYPO3\CMS\Core\Utility\GeneralUtility;
use ‪TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController;
 
class ‪AdminPanelRenderer implements MiddlewareInterface
{
 
    public function ‪process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
    {
        $response = $handler->handle($request);
        if (
            !($response instanceof ‪NullResponse)
            && ‪$GLOBALS['TSFE'] instanceof ‪TypoScriptFrontendController
            && ‪$GLOBALS['TSFE']->isOutputting(true)
            && ‪StateUtility::isActivatedForUser()
            && ‪StateUtility::isActivatedInTypoScript()
            && !‪StateUtility::isHiddenForUser()
        ) {
            $mainController = GeneralUtility::makeInstance(MainController::class);
            $body = $response->getBody();
            $body->rewind();
            $contents = $response->getBody()->getContents();
            $content = str_ireplace(
                '</body>',
                $mainController->render($request) . '</body>',
                $contents
            );
            $body = new ‪Stream('php://temp', 'rw');
            $body->write($content);
            $response = $response->withBody($body);
        }
        return $response;
    }
}