vendor/symfony/http-kernel/EventListener/LocaleListener.php line 47

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  1. <?php
  3. /*
  4. * This file is part of the Symfony package.
  5. *
  6. * (c) Fabien Potencier <fabien@symfony.com>
  7. *
  8. * For the full copyright and license information, please view the LICENSE
  9. * file that was distributed with this source code.
  10. */
  12. namespace Symfony\Component\HttpKernel\EventListener;
  14. use Symfony\Component\EventDispatcher\EventSubscriberInterface;
  15. use Symfony\Component\HttpFoundation\Request;
  16. use Symfony\Component\HttpFoundation\RequestStack;
  17. use Symfony\Component\HttpKernel\Event\FinishRequestEvent;
  18. use Symfony\Component\HttpKernel\Event\KernelEvent;
  19. use Symfony\Component\HttpKernel\Event\RequestEvent;
  20. use Symfony\Component\HttpKernel\KernelEvents;
  21. use Symfony\Component\Routing\RequestContextAwareInterface;
  23. /**
  24. * Initializes the locale based on the current request.
  25. *
  26. * @author Fabien Potencier <fabien@symfony.com>
  27. *
  28. * @final
  29. */
  30. class LocaleListener implements EventSubscriberInterface
  31. {
  32. private $router;
  33. private $defaultLocale;
  34. private $requestStack;
  35. private $useAcceptLanguageHeader;
  36. private $enabledLocales;
  38. public function __construct(RequestStack $requestStack, string $defaultLocale = 'en', ?RequestContextAwareInterface $router = null, bool $useAcceptLanguageHeader = false, array $enabledLocales = [])
  39. {
  40. $this->defaultLocale = $defaultLocale;
  41. $this->requestStack = $requestStack;
  42. $this->router = $router;
  43. $this->useAcceptLanguageHeader = $useAcceptLanguageHeader;
  44. $this->enabledLocales = $enabledLocales;
  45. }
  47. public function setDefaultLocale(KernelEvent $event)
  48. {
  49. $event->getRequest()->setDefaultLocale($this->defaultLocale);
  50. }
  52. public function onKernelRequest(RequestEvent $event)
  53. {
  54. $request = $event->getRequest();
  56. $this->setLocale($request);
  57. $this->setRouterContext($request);
  58. }
  60. public function onKernelFinishRequest(FinishRequestEvent $event)
  61. {
  62. if (null !== $parentRequest = $this->requestStack->getParentRequest()) {
  63. $this->setRouterContext($parentRequest);
  64. }
  65. }
  67. private function setLocale(Request $request)
  68. {
  69. if ($locale = $request->attributes->get('_locale')) {
  70. $request->setLocale($locale);
  71. } elseif ($this->useAcceptLanguageHeader && $this->enabledLocales) {
  72. if ($request->getLanguages() && $preferredLanguage = $request->getPreferredLanguage($this->enabledLocales)) {
  73. $request->setLocale($preferredLanguage);
  74. }
  75. $request->attributes->set('_vary_by_language', true);
  76. }
  77. }
  79. private function setRouterContext(Request $request)
  80. {
  81. if (null !== $this->router) {
  82. $this->router->getContext()->setParameter('_locale', $request->getLocale());
  83. }
  84. }
  86. public static function getSubscribedEvents(): array
  87. {
  88. return [
  89. KernelEvents::REQUEST => [
  90. ['setDefaultLocale', 100],
  91. // must be registered after the Router to have access to the _locale
  92. ['onKernelRequest', 16],
  93. ],
  94. KernelEvents::FINISH_REQUEST => [['onKernelFinishRequest', 0]],
  95. ];
  96. }
  97. }