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typo3/sysext/backend/Classes/Middleware/LegacyBackendTemplateInitialization.php

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+<?php
+declare(strict_types = 1);
+namespace TYPO3\CMS\Backend\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\Backend\Template\DocumentTemplate;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+
+/**
+ * Initializes the global object $GLOBALS['TBE_TEMPLATE'] for legacy reasons
+ *
+ * @internal
+ */
+class LegacyBackendTemplateInitialization implements MiddlewareInterface
+{
+    /**
+     * $GLOBALS['TBE_TEMPLATE'] is available then
+     *
+     * @param ServerRequestInterface $request
+     * @param RequestHandlerInterface $handler
+     * @return ResponseInterface
+     */
+    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
+    {
+        $GLOBALS['TBE_TEMPLATE'] = GeneralUtility::makeInstance(DocumentTemplate::class);
+        return $handler->handle($request);
+    }
+}