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- 27.10.2014
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RouterListener.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\HttpKernel\EventListener;
013
014 use Psr\Log\LoggerInterface;
015 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
016 use Symfony\Component\HttpKernel\KernelEvents;
017 use Symfony\Component\HttpKernel\Exception\MethodNotAllowedHttpException;
018 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
019 use Symfony\Component\Routing\Exception\MethodNotAllowedException;
020 use Symfony\Component\Routing\Exception\ResourceNotFoundException;
021 use Symfony\Component\Routing\Matcher\UrlMatcherInterface;
022 use Symfony\Component\Routing\Matcher\RequestMatcherInterface;
023 use Symfony\Component\Routing\RequestContext;
024 use Symfony\Component\Routing\RequestContextAwareInterface;
025 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
026 use Symfony\Component\HttpFoundation\Request;
027
028 /**
029 * Initializes the context from the request and sets request attributes based on a matching route.
030 *
031 * @author Fabien Potencier <fabien@symfony.com>
032 */
033 class RouterListener implements EventSubscriberInterface
034 {
035 private $matcher;
036 private $context;
037 private $logger;
038 private $request;
039
040 /**
041 * Constructor.
042 *
043 * @param UrlMatcherInterface|RequestMatcherInterface $matcher The Url or Request matcher
044 * @param RequestContext|null $context The RequestContext (can be null when $matcher implements RequestContextAwareInterface)
045 * @param LoggerInterface|null $logger The logger
046 *
047 * @throws \InvalidArgumentException
048 */
049 public function __construct($matcher, RequestContext $context = null, LoggerInterface $logger = null)
050 {
051 if (!$matcher instanceof UrlMatcherInterface && !$matcher instanceof RequestMatcherInterface) {
052 throw new \InvalidArgumentException('Matcher must either implement UrlMatcherInterface or RequestMatcherInterface.');
053 }
054
055 if (null === $context && !$matcher instanceof RequestContextAwareInterface) {
056 throw new \InvalidArgumentException('You must either pass a RequestContext or the matcher must implement RequestContextAwareInterface.');
057 }
058
059 $this->matcher = $matcher;
060 $this->context = $context ?: $matcher->getContext();
061 $this->logger = $logger;
062 }
063
064 /**
065 * Sets the current Request.
066 *
067 * The application should call this method whenever the Request
068 * object changes (entering a Request scope for instance, but
069 * also when leaving a Request scope -- especially when they are
070 * nested).
071 *
072 * @param Request|null $request A Request instance
073 */
074 public function setRequest(Request $request = null)
075 {
076 if (null !== $request && $this->request !== $request) {
077 $this->context->fromRequest($request);
078 }
079 $this->request = $request;
080 }
081
082 public function onKernelRequest(GetResponseEvent $event)
083 {
084 $request = $event->getRequest();
085
086 // initialize the context that is also used by the generator (assuming matcher and generator share the same context instance)
087 // we call setRequest even if most of the time, it has already been done to keep compatibility
088 // with frameworks which do not use the Symfony service container
089 $this->setRequest($request);
090
091 if ($request->attributes->has('_controller')) {
092 // routing is already done
093 return;
094 }
095
096 // add attributes based on the request (routing)
097 try {
098 // matching a request is more powerful than matching a URL path + context, so try that first
099 if ($this->matcher instanceof RequestMatcherInterface) {
100 $parameters = $this->matcher->matchRequest($request);
101 } else {
102 $parameters = $this->matcher->match($request->getPathInfo());
103 }
104
105 if (null !== $this->logger) {
106 $this->logger->info(sprintf('Matched route "%s" (parameters: %s)', $parameters['_route'], $this->parametersToString($parameters)));
107 }
108
109 $request->attributes->add($parameters);
110 unset($parameters['_route']);
111 unset($parameters['_controller']);
112 $request->attributes->set('_route_params', $parameters);
113 } catch (ResourceNotFoundException $e) {
114 $message = sprintf('No route found for "%s %s"', $request->getMethod(), $request->getPathInfo());
115
116 throw new NotFoundHttpException($message, $e);
117 } catch (MethodNotAllowedException $e) {
118 $message = sprintf('No route found for "%s %s": Method Not Allowed (Allow: %s)', $request->getMethod(), $request->getPathInfo(), implode(', ', $e->getAllowedMethods()));
119
120 throw new MethodNotAllowedHttpException($e->getAllowedMethods(), $message, $e);
121 }
122 }
123
124 private function parametersToString(array $parameters)
125 {
126 $pieces = array();
127 foreach ($parameters as $key => $val) {
128 $pieces[] = sprintf('"%s": "%s"', $key, (is_string($val) ? $val : json_encode($val)));
129 }
130
131 return implode(', ', $pieces);
132 }
133
134 public static function getSubscribedEvents()
135 {
136 return array(
137 KernelEvents::REQUEST => array(array('onKernelRequest', 32)),
138 );
139 }
140 }
141