diff core/modules/system/src/SystemConfigSubscriber.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/modules/system/src/SystemConfigSubscriber.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,92 @@
+<?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 $router_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;
+  }
+
+}