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typo3/sysext/frontend/Classes/Http/Application.php

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+<?php
+declare(strict_types = 1);
+namespace TYPO3\CMS\Frontend\Http;
+
+/*
+ * 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 TYPO3\CMS\Core\Configuration\ConfigurationManager;
+use TYPO3\CMS\Core\Context\Context;
+use TYPO3\CMS\Core\Context\DateTimeAspect;
+use TYPO3\CMS\Core\Context\UserAspect;
+use TYPO3\CMS\Core\Context\VisibilityAspect;
+use TYPO3\CMS\Core\Context\WorkspaceAspect;
+use TYPO3\CMS\Core\Core\Environment;
+use TYPO3\CMS\Core\Http\AbstractApplication;
+use TYPO3\CMS\Core\Http\RedirectResponse;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+
+/**
+ * Entry point for the TYPO3 Frontend
+ */
+class Application extends AbstractApplication
+{
+    /**
+     * @var string
+     */
+    protected $requestHandler = RequestHandler::class;
+
+    /**
+     * @var string
+     */
+    protected $middlewareStack = 'frontend';
+
+    /**
+     * @var ConfigurationManager
+     */
+    protected $configurationManager;
+
+    /**
+     * @param ConfigurationManager $configurationManager
+     */
+    public function __construct(ConfigurationManager $configurationManager)
+    {
+        $this->configurationManager = $configurationManager;
+    }
+
+    /**
+     * @param ServerRequestInterface $request
+     * @return ResponseInterface
+     */
+    protected function handle(ServerRequestInterface $request): ResponseInterface
+    {
+        if (!$this->checkIfEssentialConfigurationExists()) {
+            return $this->installToolRedirect();
+        }
+        $this->initializeContext();
+        return parent::handle($request);
+    }
+
+    /**
+     * Check if LocalConfiguration.php and PackageStates.php exist
+     *
+     * @return bool TRUE when the essential configuration is available, otherwise FALSE
+     */
+    protected function checkIfEssentialConfigurationExists(): bool
+    {
+        return file_exists($this->configurationManager->getLocalConfigurationFileLocation())
+            && file_exists(Environment::getLegacyConfigPath() . '/PackageStates.php');
+    }
+
+    /**
+     * Create a PSR-7 Response that redirects to the install tool
+     *
+     * @return ResponseInterface
+     */
+    protected function installToolRedirect(): ResponseInterface
+    {
+        $path = TYPO3_mainDir . 'install.php';
+        return new RedirectResponse($path, 302);
+    }
+
+    /**
+     * Initializes the Context used for accessing data and finding out the current state of the application
+     * Will be moved to a DI-like concept once introduced, for now, this is a singleton
+     */
+    protected function initializeContext()
+    {
+        GeneralUtility::makeInstance(Context::class, [
+            'date' => new DateTimeAspect(new \DateTimeImmutable('@' . $GLOBALS['EXEC_TIME'])),
+            'visibility' => new VisibilityAspect(),
+            'workspace' => new WorkspaceAspect(0),
+            'backend.user' => new UserAspect(null),
+            'frontend.user' => new UserAspect(null, [0, -1]),
+        ]);
+    }
+}