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typo3/sysext/adminpanel/Classes/Middleware/AdminPanelRenderer.php

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+<?php
+declare(strict_types = 1);
+
+namespace TYPO3\CMS\Adminpanel\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\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;
+
+/**
+ * Render the admin panel via PSR-15 middleware
+ *
+ * @internal
+ */
+class AdminPanelRenderer implements MiddlewareInterface
+{
+
+    /**
+     * Render the admin panel if activated
+     * @param ServerRequestInterface $request
+     * @param RequestHandlerInterface $handler
+     * @return ResponseInterface
+     */
+    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
+    {
+        $response = $handler->handle($request);
+        if (
+            !($response instanceof NullResponse)
+            && $GLOBALS['TSFE'] instanceof TypoScriptFrontendController
+            && $GLOBALS['TSFE']->isOutputting()
+            && 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;
+    }
+}