Chris@14: <?php
Chris@14: 
Chris@14: namespace Drupal\layout_builder\EventSubscriber;
Chris@14: 
Chris@17: use Drupal\block_content\Access\RefinableDependentAccessInterface;
Chris@14: use Drupal\Core\Access\AccessResult;
Chris@14: use Drupal\Core\Block\BlockPluginInterface;
Chris@17: use Drupal\Core\Render\Element;
Chris@17: use Drupal\Core\Render\PreviewFallbackInterface;
Chris@14: use Drupal\Core\Session\AccountInterface;
Chris@18: use Drupal\Core\StringTranslation\StringTranslationTrait;
Chris@17: use Drupal\layout_builder\Access\LayoutPreviewAccessAllowed;
Chris@14: use Drupal\layout_builder\Event\SectionComponentBuildRenderArrayEvent;
Chris@14: use Drupal\layout_builder\LayoutBuilderEvents;
Chris@18: use Drupal\views\Plugin\Block\ViewsBlock;
Chris@14: use Symfony\Component\EventDispatcher\EventSubscriberInterface;
Chris@14: 
Chris@14: /**
Chris@14:  * Builds render arrays and handles access for all block components.
Chris@14:  *
Chris@14:  * @internal
Chris@18:  *   Tagged services are internal.
Chris@14:  */
Chris@14: class BlockComponentRenderArray implements EventSubscriberInterface {
Chris@14: 
Chris@18:   use StringTranslationTrait;
Chris@18: 
Chris@14:   /**
Chris@14:    * The current user.
Chris@14:    *
Chris@14:    * @var \Drupal\Core\Session\AccountInterface
Chris@14:    */
Chris@14:   protected $currentUser;
Chris@14: 
Chris@14:   /**
Chris@14:    * Creates a BlockComponentRenderArray object.
Chris@14:    *
Chris@14:    * @param \Drupal\Core\Session\AccountInterface $current_user
Chris@14:    *   The current user.
Chris@14:    */
Chris@14:   public function __construct(AccountInterface $current_user) {
Chris@14:     $this->currentUser = $current_user;
Chris@14:   }
Chris@14: 
Chris@14:   /**
Chris@14:    * {@inheritdoc}
Chris@14:    */
Chris@14:   public static function getSubscribedEvents() {
Chris@14:     $events[LayoutBuilderEvents::SECTION_COMPONENT_BUILD_RENDER_ARRAY] = ['onBuildRender', 100];
Chris@14:     return $events;
Chris@14:   }
Chris@14: 
Chris@14:   /**
Chris@14:    * Builds render arrays for block plugins and sets it on the event.
Chris@14:    *
Chris@14:    * @param \Drupal\layout_builder\Event\SectionComponentBuildRenderArrayEvent $event
Chris@14:    *   The section component render event.
Chris@14:    */
Chris@14:   public function onBuildRender(SectionComponentBuildRenderArrayEvent $event) {
Chris@14:     $block = $event->getPlugin();
Chris@14:     if (!$block instanceof BlockPluginInterface) {
Chris@14:       return;
Chris@14:     }
Chris@14: 
Chris@17:     // Set block access dependency even if we are not checking access on
Chris@17:     // this level. The block itself may render another
Chris@17:     // RefinableDependentAccessInterface object and need to pass on this value.
Chris@17:     if ($block instanceof RefinableDependentAccessInterface) {
Chris@17:       $contexts = $event->getContexts();
Chris@17:       if (isset($contexts['layout_builder.entity'])) {
Chris@17:         if ($entity = $contexts['layout_builder.entity']->getContextValue()) {
Chris@17:           if ($event->inPreview()) {
Chris@17:             // If previewing in Layout Builder allow access.
Chris@17:             $block->setAccessDependency(new LayoutPreviewAccessAllowed());
Chris@17:           }
Chris@17:           else {
Chris@17:             $block->setAccessDependency($entity);
Chris@17:           }
Chris@17:         }
Chris@17:       }
Chris@17:     }
Chris@17: 
Chris@14:     // Only check access if the component is not being previewed.
Chris@14:     if ($event->inPreview()) {
Chris@14:       $access = AccessResult::allowed()->setCacheMaxAge(0);
Chris@14:     }
Chris@14:     else {
Chris@14:       $access = $block->access($this->currentUser, TRUE);
Chris@14:     }
Chris@14: 
Chris@14:     $event->addCacheableDependency($access);
Chris@14:     if ($access->isAllowed()) {
Chris@14:       $event->addCacheableDependency($block);
Chris@14: 
Chris@18:       // @todo Revisit after https://www.drupal.org/node/3027653, as this will
Chris@18:       //   provide a better way to remove contextual links from Views blocks.
Chris@18:       //   Currently, doing this requires setting
Chris@18:       //   \Drupal\views\ViewExecutable::$showAdminLinks() to false before the
Chris@18:       //   Views block is built.
Chris@18:       if ($block instanceof ViewsBlock && $event->inPreview()) {
Chris@18:         $block->getViewExecutable()->setShowAdminLinks(FALSE);
Chris@18:       }
Chris@18: 
Chris@17:       $content = $block->build();
Chris@17:       $is_content_empty = Element::isEmpty($content);
Chris@17:       $is_placeholder_ready = $event->inPreview() && $block instanceof PreviewFallbackInterface;
Chris@17:       // If the content is empty and no placeholder is available, return.
Chris@17:       if ($is_content_empty && !$is_placeholder_ready) {
Chris@17:         return;
Chris@17:       }
Chris@17: 
Chris@14:       $build = [
Chris@14:         // @todo Move this to BlockBase in https://www.drupal.org/node/2931040.
Chris@14:         '#theme' => 'block',
Chris@14:         '#configuration' => $block->getConfiguration(),
Chris@14:         '#plugin_id' => $block->getPluginId(),
Chris@14:         '#base_plugin_id' => $block->getBaseId(),
Chris@14:         '#derivative_plugin_id' => $block->getDerivativeId(),
Chris@14:         '#weight' => $event->getComponent()->getWeight(),
Chris@17:         'content' => $content,
Chris@14:       ];
Chris@18: 
Chris@18:       if ($block instanceof PreviewFallbackInterface) {
Chris@18:         $preview_fallback_string = $block->getPreviewFallbackString();
Chris@18:       }
Chris@18:       else {
Chris@18:         $preview_fallback_string = $this->t('"@block" block', ['@block' => $block->label()]);
Chris@18:       }
Chris@18:       // @todo Use new label methods so
Chris@18:       //   data-layout-content-preview-placeholder-label doesn't have to use
Chris@18:       //   preview fallback in https://www.drupal.org/node/2025649.
Chris@18:       $build['#attributes']['data-layout-content-preview-placeholder-label'] = $preview_fallback_string;
Chris@18: 
Chris@17:       if ($is_content_empty && $is_placeholder_ready) {
Chris@18:         $build['content']['#markup'] = $this->t('Placeholder for the @preview_fallback', ['@preview_fallback' => $block->getPreviewFallbackString()]);
Chris@17:       }
Chris@14:       $event->setBuild($build);
Chris@14:     }
Chris@14:   }
Chris@14: 
Chris@14: }