Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\system;
Chris@0: 
Chris@0: use Drupal\Core\Config\ConfigCrudEvent;
Chris@0: use Drupal\Core\Config\ConfigEvents;
Chris@0: use Drupal\Core\Config\ConfigImporterEvent;
Chris@0: use Drupal\Core\Routing\RouteBuilderInterface;
Chris@0: use Drupal\Core\StringTranslation\StringTranslationTrait;
Chris@0: use Symfony\Component\EventDispatcher\EventSubscriberInterface;
Chris@0: 
Chris@0: /**
Chris@0:  * System Config subscriber.
Chris@0:  */
Chris@0: class SystemConfigSubscriber implements EventSubscriberInterface {
Chris@0:   use StringTranslationTrait;
Chris@0: 
Chris@0:   /**
Chris@0:    * The router builder.
Chris@0:    *
Chris@0:    * @var \Drupal\Core\Routing\RouteBuilderInterface
Chris@0:    */
Chris@0:   protected $routerBuilder;
Chris@0: 
Chris@0:   /**
Chris@0:    * Constructs the SystemConfigSubscriber.
Chris@0:    *
Chris@0:    * @param \Drupal\Core\Routing\RouteBuilderInterface $router_builder
Chris@0:    *   The router builder service.
Chris@0:    */
Chris@0:   public function __construct(RouteBuilderInterface $router_builder) {
Chris@0:     $this->routerBuilder = $router_builder;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Rebuilds the router when the default or admin theme is changed.
Chris@0:    *
Chris@0:    * @param \Drupal\Core\Config\ConfigCrudEvent $event
Chris@0:    */
Chris@0:   public function onConfigSave(ConfigCrudEvent $event) {
Chris@0:     $saved_config = $event->getConfig();
Chris@0:     if ($saved_config->getName() == 'system.theme' && ($event->isChanged('admin') || $event->isChanged('default'))) {
Chris@0:       $this->routerBuilder->setRebuildNeeded();
Chris@0:     }
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Checks that the configuration synchronization is valid.
Chris@0:    *
Chris@0:    * This event listener prevents deleting all configuration. If there is
Chris@0:    * nothing to import then event propagation is stopped because there is no
Chris@0:    * config import to validate.
Chris@0:    *
Chris@0:    * @param \Drupal\Core\Config\ConfigImporterEvent $event
Chris@0:    *   The config import event.
Chris@0:    */
Chris@0:   public function onConfigImporterValidateNotEmpty(ConfigImporterEvent $event) {
Chris@0:     $importList = $event->getConfigImporter()->getStorageComparer()->getSourceStorage()->listAll();
Chris@0:     if (empty($importList)) {
Chris@0:       $event->getConfigImporter()->logError($this->t('This import is empty and if applied would delete all of your configuration, so has been rejected.'));
Chris@0:       $event->stopPropagation();
Chris@0:     }
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Checks that the configuration synchronization is valid.
Chris@0:    *
Chris@0:    * This event listener checks that the system.site:uuid's in the source and
Chris@0:    * target match.
Chris@0:    *
Chris@12:    * @param \Drupal\Core\Config\ConfigImporterEvent $event
Chris@0:    *   The config import event.
Chris@0:    */
Chris@0:   public function onConfigImporterValidateSiteUUID(ConfigImporterEvent $event) {
Chris@17:     if (!$event->getConfigImporter()->getStorageComparer()->getSourceStorage()->exists('system.site')) {
Chris@17:       $event->getConfigImporter()->logError($this->t('This import does not contain system.site configuration, so has been rejected.'));
Chris@17:     }
Chris@0:     if (!$event->getConfigImporter()->getStorageComparer()->validateSiteUuid()) {
Chris@0:       $event->getConfigImporter()->logError($this->t('Site UUID in source storage does not match the target storage.'));
Chris@0:     }
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:     // The empty check has a high priority so that it can stop propagation if
Chris@0:     // there is no configuration to import.
Chris@0:     $events[ConfigEvents::IMPORT_VALIDATE][] = ['onConfigImporterValidateNotEmpty', 512];
Chris@0:     $events[ConfigEvents::IMPORT_VALIDATE][] = ['onConfigImporterValidateSiteUUID', 256];
Chris@0:     return $events;
Chris@0:   }
Chris@0: 
Chris@0: }