Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\language\Plugin\LanguageNegotiation;
Chris@0: 
Chris@0: use Drupal\Component\Utility\UserAgent;
Chris@0: use Drupal\language\LanguageNegotiationMethodBase;
Chris@0: use Symfony\Component\HttpFoundation\Request;
Chris@0: 
Chris@0: /**
Chris@0:  * Class for identifying language from the browser Accept-language HTTP header.
Chris@0:  *
Chris@0:  * @LanguageNegotiation(
Chris@0:  *   id = \Drupal\language\Plugin\LanguageNegotiation\LanguageNegotiationBrowser::METHOD_ID,
Chris@0:  *   weight = -2,
Chris@0:  *   name = @Translation("Browser"),
Chris@0:  *   description = @Translation("Language from the browser's language settings."),
Chris@0:  *   config_route_name = "language.negotiation_browser"
Chris@0:  * )
Chris@0:  */
Chris@0: class LanguageNegotiationBrowser extends LanguageNegotiationMethodBase {
Chris@0: 
Chris@0:   /**
Chris@0:    * The language negotiation method id.
Chris@0:    */
Chris@0:   const METHOD_ID = 'language-browser';
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function getLangcode(Request $request = NULL) {
Chris@0:     $langcode = NULL;
Chris@0: 
Chris@0:     if ($this->languageManager && $request && $request->server->get('HTTP_ACCEPT_LANGUAGE')) {
Chris@0:       $http_accept_language = $request->server->get('HTTP_ACCEPT_LANGUAGE');
Chris@0:       $langcodes = array_keys($this->languageManager->getLanguages());
Chris@0:       $mappings = $this->config->get('language.mappings')->get('map');
Chris@0:       $langcode = UserAgent::getBestMatchingLangcode($http_accept_language, $langcodes, $mappings);
Chris@0:     }
Chris@0: 
Chris@18:     // Internal page cache with multiple languages and browser negotiation
Chris@18:     // could lead to wrong cached sites. Therefore disabling the internal page
Chris@18:     // cache.
Chris@18:     // @todo Solve more elegantly in https://www.drupal.org/node/2430335.
Chris@18:     \Drupal::service('page_cache_kill_switch')->trigger();
Chris@18: 
Chris@0:     return $langcode;
Chris@0:   }
Chris@0: 
Chris@0: }