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typo3/sysext/extbase/Classes/Mvc/RequestHandlerResolver.php

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+<?php
+namespace TYPO3\CMS\Extbase\Mvc;
+
+/*
+ * 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!
+ */
+
+/**
+ * Analyzes the raw request and delivers a request handler which can handle it.
+ * @internal only to be used within Extbase, not part of TYPO3 Core API.
+ */
+class RequestHandlerResolver
+{
+    /**
+     * @var \TYPO3\CMS\Extbase\Object\ObjectManagerInterface
+     */
+    protected $objectManager;
+
+    /**
+     * @var \TYPO3\CMS\Extbase\Configuration\ConfigurationManagerInterface
+     */
+    protected $configurationManager;
+
+    /**
+     * @param \TYPO3\CMS\Extbase\Object\ObjectManagerInterface $objectManager
+     */
+    public function injectObjectManager(\TYPO3\CMS\Extbase\Object\ObjectManagerInterface $objectManager)
+    {
+        $this->objectManager = $objectManager;
+    }
+
+    /**
+     * @param \TYPO3\CMS\Extbase\Configuration\ConfigurationManagerInterface $configurationManager
+     */
+    public function injectConfigurationManager(\TYPO3\CMS\Extbase\Configuration\ConfigurationManagerInterface $configurationManager)
+    {
+        $this->configurationManager = $configurationManager;
+    }
+
+    /**
+     * Analyzes the raw request and tries to find a request handler which can handle
+     * it. If none is found, an exception is thrown.
+     *
+     * @return \TYPO3\CMS\Extbase\Mvc\RequestHandlerInterface A request handler
+     * @throws \TYPO3\CMS\Extbase\Mvc\Exception
+     */
+    public function resolveRequestHandler()
+    {
+        $availableRequestHandlerClassNames = $this->getRegisteredRequestHandlerClassNames();
+        $suitableRequestHandlers = [];
+        foreach ($availableRequestHandlerClassNames as $requestHandlerClassName) {
+            $requestHandler = $this->objectManager->get($requestHandlerClassName);
+            if ($requestHandler->canHandleRequest()) {
+                $priority = $requestHandler->getPriority();
+                if (isset($suitableRequestHandlers[$priority])) {
+                    throw new \TYPO3\CMS\Extbase\Mvc\Exception('More than one request handler with the same priority can handle the request, but only one handler may be active at a time!', 1176475350);
+                }
+                $suitableRequestHandlers[$priority] = $requestHandler;
+            }
+        }
+        if (empty($suitableRequestHandlers)) {
+            throw new \TYPO3\CMS\Extbase\Mvc\Exception('No suitable request handler found.', 1205414233);
+        }
+        ksort($suitableRequestHandlers);
+        return array_pop($suitableRequestHandlers);
+    }
+
+    /**
+     * Returns a list of all registered request handlers.
+     *
+     * @return array
+     */
+    public function getRegisteredRequestHandlerClassNames()
+    {
+        $settings = $this->configurationManager->getConfiguration(\TYPO3\CMS\Extbase\Configuration\ConfigurationManagerInterface::CONFIGURATION_TYPE_FRAMEWORK);
+        return is_array($settings['mvc']['requestHandlers']) ? $settings['mvc']['requestHandlers'] : [];
+    }
+}