Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\language\EventSubscriber;
Chris@0: 
Chris@0: use Drupal\Core\Config\ConfigFactoryInterface;
Chris@0: use Drupal\Core\Language\Language;
Chris@0: use Drupal\Core\Language\LanguageDefault;
Chris@0: use Drupal\Core\Language\LanguageManagerInterface;
Chris@0: use Drupal\Core\Config\ConfigCrudEvent;
Chris@0: use Drupal\Core\Config\ConfigEvents;
Chris@0: use Drupal\language\ConfigurableLanguageManager;
Chris@0: use Drupal\language\HttpKernel\PathProcessorLanguage;
Chris@0: use Drupal\language\LanguageNegotiatorInterface;
Chris@0: use Symfony\Component\EventDispatcher\EventSubscriberInterface;
Chris@0: 
Chris@0: /**
Chris@0:  * Deletes the container if default language has changed.
Chris@0:  */
Chris@0: class ConfigSubscriber implements EventSubscriberInterface {
Chris@0: 
Chris@0:   /**
Chris@0:    * The language manager.
Chris@0:    *
Chris@0:    * @var \Drupal\Core\Language\LanguageManagerInterface
Chris@0:    */
Chris@0:   protected $languageManager;
Chris@0: 
Chris@0:   /**
Chris@0:    * The default language.
Chris@0:    *
Chris@0:    * @var \Drupal\Core\Language\LanguageDefault
Chris@0:    */
Chris@0:   protected $languageDefault;
Chris@0: 
Chris@0:   /**
Chris@0:    * The configuration factory.
Chris@0:    *
Chris@0:    * @var \Drupal\Core\Config\ConfigFactoryInterface
Chris@0:    */
Chris@0:   protected $configFactory;
Chris@0: 
Chris@0:   /**
Chris@0:    * The language negotiator.
Chris@0:    *
Chris@0:    * @var \Drupal\language\LanguageNegotiatorInterface
Chris@0:    */
Chris@0:   protected $languageNegotiator;
Chris@0: 
Chris@0:   /**
Chris@0:    * The language path processor.
Chris@0:    *
Chris@0:    * @var \Drupal\language\HttpKernel\PathProcessorLanguage
Chris@0:    */
Chris@0:   protected $pathProcessorLanguage;
Chris@0: 
Chris@0:   /**
Chris@0:    * Constructs a new class object.
Chris@0:    *
Chris@0:    * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
Chris@0:    *   The language manager.
Chris@0:    * @param \Drupal\Core\Language\LanguageDefault $language_default
Chris@0:    *   The default language.
Chris@0:    * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
Chris@0:    *   The configuration factory.
Chris@0:    * @param \Drupal\language\LanguageNegotiatorInterface $language_negotiator
Chris@0:    *   The language negotiator.
Chris@0:    */
Chris@0:   public function __construct(LanguageManagerInterface $language_manager, LanguageDefault $language_default, ConfigFactoryInterface $config_factory, LanguageNegotiatorInterface $language_negotiator) {
Chris@0:     $this->languageManager = $language_manager;
Chris@0:     $this->languageDefault = $language_default;
Chris@0:     $this->configFactory = $config_factory;
Chris@0:     $this->languageNegotiator = $language_negotiator;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Causes the container to be rebuilt on the next request.
Chris@0:    *
Chris@0:    * This event subscriber assumes that the new default langcode and old default
Chris@0:    * langcode are valid langcodes. If the schema definition of either
Chris@0:    * system.site:default_langcode or language.negotiation::url.prefixes changes
Chris@0:    * then this event must be changed to work with both the old and new schema
Chris@0:    * definition so this event is update safe.
Chris@0:    *
Chris@12:    * @param \Drupal\Core\Config\ConfigCrudEvent $event
Chris@0:    *   The configuration event.
Chris@0:    */
Chris@0:   public function onConfigSave(ConfigCrudEvent $event) {
Chris@0:     $saved_config = $event->getConfig();
Chris@0:     if ($saved_config->getName() == 'system.site' && $event->isChanged('default_langcode')) {
Chris@0:       $new_default_langcode = $saved_config->get('default_langcode');
Chris@0:       $default_language = $this->configFactory->get('language.entity.' . $new_default_langcode);
Chris@0:       // During an import the language might not exist yet.
Chris@0:       if (!$default_language->isNew()) {
Chris@0:         $this->languageDefault->set(new Language($default_language->get()));
Chris@0:         $this->languageManager->reset();
Chris@0: 
Chris@0:         // Directly update language negotiation settings instead of calling
Chris@0:         // language_negotiation_url_prefixes_update() to ensure that the code
Chris@0:         // obeys the hook_update_N() restrictions.
Chris@0:         $negotiation_config = $this->configFactory->getEditable('language.negotiation');
Chris@0:         $negotiation_changed = FALSE;
Chris@0:         $url_prefixes = $negotiation_config->get('url.prefixes');
Chris@0:         $old_default_langcode = $saved_config->getOriginal('default_langcode');
Chris@0:         if (empty($url_prefixes[$old_default_langcode])) {
Chris@0:           $negotiation_config->set('url.prefixes.' . $old_default_langcode, $old_default_langcode);
Chris@0:           $negotiation_changed = TRUE;
Chris@0:         }
Chris@0:         if (empty($url_prefixes[$new_default_langcode])) {
Chris@0:           $negotiation_config->set('url.prefixes.' . $new_default_langcode, '');
Chris@0:           $negotiation_changed = TRUE;
Chris@0:         }
Chris@0:         if ($negotiation_changed) {
Chris@0:           $negotiation_config->save(TRUE);
Chris@0:         }
Chris@0:       }
Chris@0:       // Trigger a container rebuild on the next request by invalidating it.
Chris@0:       ConfigurableLanguageManager::rebuildServices();
Chris@0:     }
Chris@0:     elseif ($saved_config->getName() == 'language.types' && $event->isChanged('negotiation')) {
Chris@0:       // If the negotiation configuration changed the language negotiator and
Chris@0:       // the language path processor have to be reset so that they regenerate
Chris@0:       // the method instances and also sort them accordingly to the new config.
Chris@0:       $this->languageNegotiator->reset();
Chris@0:       if (isset($this->pathProcessorLanguage)) {
Chris@0:         $this->pathProcessorLanguage->reset();
Chris@0:       }
Chris@0:     }
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Injects the language path processors on multilingual site configuration.
Chris@0:    *
Chris@0:    * @param \Drupal\language\HttpKernel\PathProcessorLanguage $path_processor_language
Chris@0:    *   The language path processor.
Chris@0:    */
Chris@0:   public function setPathProcessorLanguage(PathProcessorLanguage $path_processor_language) {
Chris@0:     $this->pathProcessorLanguage = $path_processor_language;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public static function getSubscribedEvents() {
Chris@0:     $events[ConfigEvents::SAVE][] = ['onConfigSave', 0];
Chris@0:     return $events;
Chris@0:   }
Chris@0: 
Chris@0: }