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typo3/sysext/frontend/Classes/Middleware/TypoScriptFrontendInitialization.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 Doctrine\DBAL\Exception\ConnectionException;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\MiddlewareInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+use Psr\Log\LoggerAwareInterface;
+use Psr\Log\LoggerAwareTrait;
+use TYPO3\CMS\Core\Database\ConnectionPool;
+use TYPO3\CMS\Core\Error\Http\ServiceUnavailableException;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+use TYPO3\CMS\Frontend\Controller\ErrorController;
+use TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController;
+
+/**
+ * Creates an instance of TypoScriptFrontendController and makes this globally available
+ * via $GLOBALS['TSFE'].
+ *
+ * For now, GeneralUtility::_GP() is used in favor of $request->getQueryParams() due to
+ * hooks who could have $_GET/$_POST modified before.
+ *
+ * @internal this middleware might get removed in TYPO3 v10.0.
+ */
+class TypoScriptFrontendInitialization implements MiddlewareInterface, LoggerAwareInterface
+{
+    use LoggerAwareTrait;
+
+    /**
+     * Creates an instance of TSFE and sets it as a global variable,
+     * also pings the database in order ensure a valid database connection.
+     *
+     * @param ServerRequestInterface $request
+     * @param RequestHandlerInterface $handler
+     * @return ResponseInterface
+     */
+    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
+    {
+        $GLOBALS['TSFE'] = GeneralUtility::makeInstance(
+            TypoScriptFrontendController::class,
+            null,
+            GeneralUtility::_GP('id'),
+            GeneralUtility::_GP('type'),
+            null,
+            GeneralUtility::_GP('cHash'),
+            null,
+            GeneralUtility::_GP('MP')
+        );
+        if (GeneralUtility::_GP('no_cache')) {
+            $GLOBALS['TSFE']->set_no_cache('&no_cache=1 has been supplied, so caching is disabled! URL: "' . (string)$request->getUri() . '"');
+        }
+
+        // Set up the database connection and see if the connection can be established
+        try {
+            $connection = GeneralUtility::makeInstance(ConnectionPool::class)->getConnectionForTable('pages');
+            $connection->connect();
+        } catch (ConnectionException | \RuntimeException $exception) {
+            $message = 'Cannot connect to the configured database';
+            $this->logger->emergency($message, ['exception' => $exception]);
+            try {
+                return GeneralUtility::makeInstance(ErrorController::class)->unavailableAction($request, $message);
+            } catch (ServiceUnavailableException $e) {
+                throw new ServiceUnavailableException($message, 1526013723);
+            }
+        }
+        // Call post processing function for DB connection:
+        if (!empty($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_fe.php']['connectToDB'])) {
+            trigger_error('The "connectToDB" hook will be removed in TYPO3 v10.0 in favor of PSR-15. Use a middleware instead.', E_USER_DEPRECATED);
+            $_params = ['pObj' => &$GLOBALS['TSFE']];
+            foreach ($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_fe.php']['connectToDB'] as $_funcRef) {
+                GeneralUtility::callUserFunction($_funcRef, $_params, $GLOBALS['TSFE']);
+            }
+        }
+
+        return $handler->handle($request);
+    }
+}