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