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- 06.01.2017
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LocaleListener.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 Symfony\Component\HttpKernel\Event\GetResponseEvent;
015 use Symfony\Component\HttpKernel\Event\FinishRequestEvent;
016 use Symfony\Component\HttpKernel\KernelEvents;
017 use Symfony\Component\HttpFoundation\RequestStack;
018 use Symfony\Component\HttpFoundation\Request;
019 use Symfony\Component\Routing\RequestContextAwareInterface;
020 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
021
022 /**
023 * Initializes the locale based on the current request.
024 *
025 * This listener works in 2 modes:
026 *
027 * * 2.3 compatibility mode where you must call setRequest whenever the Request changes.
028 * * 2.4+ mode where you must pass a RequestStack instance in the constructor.
029 *
030 * @author Fabien Potencier <fabien@symfony.com>
031 */
032 class LocaleListener implements EventSubscriberInterface
033 {
034 private $router;
035 private $defaultLocale;
036 private $requestStack;
037
038 /**
039 * Constructor.
040 *
041 * RequestStack will become required in 3.0.
042 *
043 * @param RequestStack $requestStack A RequestStack instance
044 * @param string $defaultLocale The default locale
045 * @param RequestContextAwareInterface|null $router The router
046 *
047 * @throws \InvalidArgumentException
048 */
049 public function __construct($requestStack = null, $defaultLocale = 'en', $router = null)
050 {
051 if ((null !== $requestStack && !$requestStack instanceof RequestStack) || $defaultLocale instanceof RequestContextAwareInterface || $router instanceof RequestStack) {
052 $tmp = $router;
053 $router = func_num_args() < 2 ? null : $defaultLocale;
054 $defaultLocale = $requestStack;
055 $requestStack = func_num_args() < 3 ? null : $tmp;
056
057 @trigger_error('The '.__METHOD__.' method now requires a RequestStack to be given as first argument as '.__CLASS__.'::setRequest method will not be supported anymore in 3.0.', E_USER_DEPRECATED);
058 } elseif (!$requestStack instanceof RequestStack) {
059 @trigger_error('The '.__METHOD__.' method now requires a RequestStack instance as '.__CLASS__.'::setRequest method will not be supported anymore in 3.0.', E_USER_DEPRECATED);
060 }
061
062 if (null !== $requestStack && !$requestStack instanceof RequestStack) {
063 throw new \InvalidArgumentException('RequestStack instance expected.');
064 }
065 if (null !== $router && !$router instanceof RequestContextAwareInterface) {
066 throw new \InvalidArgumentException('Router must implement RequestContextAwareInterface.');
067 }
068
069 $this->defaultLocale = $defaultLocale;
070 $this->requestStack = $requestStack;
071 $this->router = $router;
072 }
073
074 /**
075 * Sets the current Request.
076 *
077 * This method was used to synchronize the Request, but as the HttpKernel
078 * is doing that automatically now, you should never call it directly.
079 * It is kept public for BC with the 2.3 version.
080 *
081 * @param Request|null $request A Request instance
082 *
083 * @deprecated since version 2.4, to be removed in 3.0.
084 */
085 public function setRequest(Request $request = null)
086 {
087 @trigger_error('The '.__METHOD__.' method is deprecated since version 2.4 and will be removed in 3.0.', E_USER_DEPRECATED);
088
089 if (null === $request) {
090 return;
091 }
092
093 $this->setLocale($request);
094 $this->setRouterContext($request);
095 }
096
097 public function onKernelRequest(GetResponseEvent $event)
098 {
099 $request = $event->getRequest();
100 $request->setDefaultLocale($this->defaultLocale);
101
102 $this->setLocale($request);
103 $this->setRouterContext($request);
104 }
105
106 public function onKernelFinishRequest(FinishRequestEvent $event)
107 {
108 if (null === $this->requestStack) {
109 return; // removed when requestStack is required
110 }
111
112 if (null !== $parentRequest = $this->requestStack->getParentRequest()) {
113 $this->setRouterContext($parentRequest);
114 }
115 }
116
117 private function setLocale(Request $request)
118 {
119 if ($locale = $request->attributes->get('_locale')) {
120 $request->setLocale($locale);
121 }
122 }
123
124 private function setRouterContext(Request $request)
125 {
126 if (null !== $this->router) {
127 $this->router->getContext()->setParameter('_locale', $request->getLocale());
128 }
129 }
130
131 public static function getSubscribedEvents()
132 {
133 return array(
134 // must be registered after the Router to have access to the _locale
135 KernelEvents::REQUEST => array(array('onKernelRequest', 16)),
136 KernelEvents::FINISH_REQUEST => array(array('onKernelFinishRequest', 0)),
137 );
138 }
139 }
140