diff core/modules/node/src/Controller/NodeViewController.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/modules/node/src/Controller/NodeViewController.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,112 @@
+<?php
+
+namespace Drupal\node\Controller;
+
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Entity\Controller\EntityViewController;
+use Drupal\Core\Entity\EntityManagerInterface;
+use Drupal\Core\Render\RendererInterface;
+use Drupal\Core\Session\AccountInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Defines a controller to render a single node.
+ */
+class NodeViewController extends EntityViewController {
+
+  /**
+   * The current user.
+   *
+   * @var \Drupal\Core\Session\AccountInterface
+   */
+  protected $currentUser;
+
+  /**
+   * Creates an NodeViewController object.
+   *
+   * @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
+   *   The entity manager.
+   * @param \Drupal\Core\Render\RendererInterface $renderer
+   *   The renderer service.
+   * @param \Drupal\Core\Session\AccountInterface $current_user
+   *   The current user. For backwards compatibility this is optional, however
+   *   this will be removed before Drupal 9.0.0.
+   */
+  public function __construct(EntityManagerInterface $entity_manager, RendererInterface $renderer, AccountInterface $current_user = NULL) {
+    parent::__construct($entity_manager, $renderer);
+    $this->currentUser = $current_user ?: \Drupal::currentUser();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('entity.manager'),
+      $container->get('renderer'),
+      $container->get('current_user')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function view(EntityInterface $node, $view_mode = 'full', $langcode = NULL) {
+    $build = parent::view($node, $view_mode, $langcode);
+
+    foreach ($node->uriRelationships() as $rel) {
+      $url = $node->toUrl($rel);
+      // Add link relationships if the user is authenticated or if the anonymous
+      // user has access. Access checking must be done for anonymous users to
+      // avoid traffic to inaccessible pages from web crawlers. For
+      // authenticated users, showing the links in HTML head does not impact
+      // user experience or security, since the routes are access checked when
+      // visited and only visible via view source. This prevents doing
+      // potentially expensive and hard to cache access checks on every request.
+      // This means that the page will vary by user.permissions. We also rely on
+      // the access checking fallback to ensure the correct cacheability
+      // metadata if we have to check access.
+      if ($this->currentUser->isAuthenticated() || $url->access($this->currentUser)) {
+        // Set the node path as the canonical URL to prevent duplicate content.
+        $build['#attached']['html_head_link'][] = [
+          [
+            'rel' => $rel,
+            'href' => $url->toString(),
+          ],
+          TRUE,
+        ];
+      }
+
+      if ($rel == 'canonical') {
+        // Set the non-aliased canonical path as a default shortlink.
+        $build['#attached']['html_head_link'][] = [
+          [
+            'rel' => 'shortlink',
+            'href' => $url->setOption('alias', TRUE)->toString(),
+          ],
+          TRUE,
+        ];
+      }
+    }
+
+    // Given this varies by $this->currentUser->isAuthenticated(), add a cache
+    // context based on the anonymous role.
+    $build['#cache']['contexts'][] = 'user.roles:anonymous';
+
+    return $build;
+  }
+
+  /**
+   * The _title_callback for the page that renders a single node.
+   *
+   * @param \Drupal\Core\Entity\EntityInterface $node
+   *   The current node.
+   *
+   * @return string
+   *   The page title.
+   */
+  public function title(EntityInterface $node) {
+    return $this->entityManager->getTranslationFromContext($node)->label();
+  }
+
+}