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diff --git a/web/core/modules/comment/src/Controller/CommentController.php b/web/core/modules/comment/src/Controller/CommentController.php
new file mode 100644
index 000000000..c834fa67a
--- /dev/null
+++ b/web/core/modules/comment/src/Controller/CommentController.php
@@ -0,0 +1,343 @@
+<?php
+
+namespace Drupal\comment\Controller;
+
+use Drupal\comment\CommentInterface;
+use Drupal\comment\CommentManagerInterface;
+use Drupal\comment\Plugin\Field\FieldType\CommentItemInterface;
+use Drupal\Core\Access\AccessResult;
+use Drupal\Core\Cache\CacheableResponseInterface;
+use Drupal\Core\Controller\ControllerBase;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Entity\EntityManagerInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\HttpFoundation\RedirectResponse;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+
+/**
+ * Controller for the comment entity.
+ *
+ * @see \Drupal\comment\Entity\Comment.
+ */
+class CommentController extends ControllerBase {
+
+  /**
+   * The HTTP kernel.
+   *
+   * @var \Symfony\Component\HttpKernel\HttpKernelInterface
+   */
+  protected $httpKernel;
+
+  /**
+   * The comment manager service.
+   *
+   * @var \Drupal\comment\CommentManagerInterface
+   */
+  protected $commentManager;
+
+  /**
+   * The entity manager.
+   *
+   * @var \Drupal\Core\Entity\EntityStorageInterface
+   */
+  protected $entityManager;
+
+  /**
+   * Constructs a CommentController object.
+   *
+   * @param \Symfony\Component\HttpKernel\HttpKernelInterface $http_kernel
+   *   HTTP kernel to handle requests.
+   * @param \Drupal\comment\CommentManagerInterface $comment_manager
+   *   The comment manager service.
+   * @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
+   *   The entity manager service.
+   */
+  public function __construct(HttpKernelInterface $http_kernel, CommentManagerInterface $comment_manager, EntityManagerInterface $entity_manager) {
+    $this->httpKernel = $http_kernel;
+    $this->commentManager = $comment_manager;
+    $this->entityManager = $entity_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('http_kernel'),
+      $container->get('comment.manager'),
+      $container->get('entity.manager')
+    );
+  }
+
+  /**
+   * Publishes the specified comment.
+   *
+   * @param \Drupal\comment\CommentInterface $comment
+   *   A comment entity.
+   *
+   * @return \Symfony\Component\HttpFoundation\RedirectResponse
+   */
+  public function commentApprove(CommentInterface $comment) {
+    $comment->setPublished(TRUE);
+    $comment->save();
+
+    drupal_set_message($this->t('Comment approved.'));
+    $permalink_uri = $comment->permalink();
+    $permalink_uri->setAbsolute();
+    return new RedirectResponse($permalink_uri->toString());
+  }
+
+  /**
+   * Redirects comment links to the correct page depending on comment settings.
+   *
+   * Since comments are paged there is no way to guarantee which page a comment
+   * appears on. Comment paging and threading settings may be changed at any
+   * time. With threaded comments, an individual comment may move between pages
+   * as comments can be added either before or after it in the overall
+   * discussion. Therefore we use a central routing function for comment links,
+   * which calculates the page number based on current comment settings and
+   * returns the full comment view with the pager set dynamically.
+   *
+   * @param \Symfony\Component\HttpFoundation\Request $request
+   *   The request of the page.
+   * @param \Drupal\comment\CommentInterface $comment
+   *   A comment entity.
+   *
+   * @return \Symfony\Component\HttpFoundation\Response
+   *   The comment listing set to the page on which the comment appears.
+   *
+   * @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException
+   * @throws \Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException
+   */
+  public function commentPermalink(Request $request, CommentInterface $comment) {
+    if ($entity = $comment->getCommentedEntity()) {
+      // Check access permissions for the entity.
+      if (!$entity->access('view')) {
+        throw new AccessDeniedHttpException();
+      }
+      $field_definition = $this->entityManager()->getFieldDefinitions($entity->getEntityTypeId(), $entity->bundle())[$comment->getFieldName()];
+
+      // Find the current display page for this comment.
+      $page = $this->entityManager()->getStorage('comment')->getDisplayOrdinal($comment, $field_definition->getSetting('default_mode'), $field_definition->getSetting('per_page'));
+      // @todo: Cleaner sub request handling.
+      $subrequest_url = $entity->urlInfo()->setOption('query', ['page' => $page])->toString(TRUE);
+      $redirect_request = Request::create($subrequest_url->getGeneratedUrl(), 'GET', $request->query->all(), $request->cookies->all(), [], $request->server->all());
+      // Carry over the session to the subrequest.
+      if ($session = $request->getSession()) {
+        $redirect_request->setSession($session);
+      }
+      $request->query->set('page', $page);
+      $response = $this->httpKernel->handle($redirect_request, HttpKernelInterface::SUB_REQUEST);
+      if ($response instanceof CacheableResponseInterface) {
+        // @todo Once path aliases have cache tags (see
+        //   https://www.drupal.org/node/2480077), add test coverage that
+        //   the cache tag for a commented entity's path alias is added to the
+        //   comment's permalink response, because there can be blocks or
+        //   other content whose renderings depend on the subrequest's URL.
+        $response->addCacheableDependency($subrequest_url);
+      }
+      return $response;
+    }
+    throw new NotFoundHttpException();
+  }
+
+  /**
+   * The _title_callback for the page that renders the comment permalink.
+   *
+   * @param \Drupal\comment\CommentInterface $comment
+   *   The current comment.
+   *
+   * @return string
+   *   The translated comment subject.
+   */
+  public function commentPermalinkTitle(CommentInterface $comment) {
+    return $this->entityManager()->getTranslationFromContext($comment)->label();
+  }
+
+  /**
+   * Redirects legacy node links to the new path.
+   *
+   * @param \Drupal\Core\Entity\EntityInterface $node
+   *   The node object identified by the legacy URL.
+   *
+   * @return \Symfony\Component\HttpFoundation\RedirectResponse
+   *   Redirects user to new url.
+   *
+   * @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException
+   */
+  public function redirectNode(EntityInterface $node) {
+    $fields = $this->commentManager->getFields('node');
+    // Legacy nodes only had a single comment field, so use the first comment
+    // field on the entity.
+    if (!empty($fields) && ($field_names = array_keys($fields)) && ($field_name = reset($field_names))) {
+      return $this->redirect('comment.reply', [
+        'entity_type' => 'node',
+        'entity' => $node->id(),
+        'field_name' => $field_name,
+      ]);
+    }
+    throw new NotFoundHttpException();
+  }
+
+  /**
+   * Form constructor for the comment reply form.
+   *
+   * There are several cases that have to be handled, including:
+   *   - replies to comments
+   *   - replies to entities
+   *
+   * @param \Symfony\Component\HttpFoundation\Request $request
+   *   The current request object.
+   * @param \Drupal\Core\Entity\EntityInterface $entity
+   *   The entity this comment belongs to.
+   * @param string $field_name
+   *   The field_name to which the comment belongs.
+   * @param int $pid
+   *   (optional) Some comments are replies to other comments. In those cases,
+   *   $pid is the parent comment's comment ID. Defaults to NULL.
+   *
+   * @return array|\Symfony\Component\HttpFoundation\RedirectResponse
+   *   An associative array containing:
+   *   - An array for rendering the entity or parent comment.
+   *     - comment_entity: If the comment is a reply to the entity.
+   *     - comment_parent: If the comment is a reply to another comment.
+   *   - comment_form: The comment form as a renderable array.
+   *
+   * @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException
+   */
+  public function getReplyForm(Request $request, EntityInterface $entity, $field_name, $pid = NULL) {
+    $account = $this->currentUser();
+    $build = [];
+
+    // The user is not just previewing a comment.
+    if ($request->request->get('op') != $this->t('Preview')) {
+
+      // $pid indicates that this is a reply to a comment.
+      if ($pid) {
+        // Load the parent comment.
+        $comment = $this->entityManager()->getStorage('comment')->load($pid);
+        // Display the parent comment.
+        $build['comment_parent'] = $this->entityManager()->getViewBuilder('comment')->view($comment);
+      }
+
+      // The comment is in response to a entity.
+      elseif ($entity->access('view', $account)) {
+        // We make sure the field value isn't set so we don't end up with a
+        // redirect loop.
+        $entity = clone $entity;
+        $entity->{$field_name}->status = CommentItemInterface::HIDDEN;
+        // Render array of the entity full view mode.
+        $build['commented_entity'] = $this->entityManager()->getViewBuilder($entity->getEntityTypeId())->view($entity, 'full');
+        unset($build['commented_entity']['#cache']);
+      }
+    }
+    else {
+      $build['#title'] = $this->t('Preview comment');
+    }
+
+    // Show the actual reply box.
+    $comment = $this->entityManager()->getStorage('comment')->create([
+      'entity_id' => $entity->id(),
+      'pid' => $pid,
+      'entity_type' => $entity->getEntityTypeId(),
+      'field_name' => $field_name,
+    ]);
+    $build['comment_form'] = $this->entityFormBuilder()->getForm($comment);
+
+    return $build;
+  }
+
+  /**
+   * Access check for the reply form.
+   *
+   * @param \Drupal\Core\Entity\EntityInterface $entity
+   *   The entity this comment belongs to.
+   * @param string $field_name
+   *   The field_name to which the comment belongs.
+   * @param int $pid
+   *   (optional) Some comments are replies to other comments. In those cases,
+   *   $pid is the parent comment's comment ID. Defaults to NULL.
+   *
+   * @return \Drupal\Core\Access\AccessResultInterface
+   *   An access result
+   *
+   * @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException
+   */
+  public function replyFormAccess(EntityInterface $entity, $field_name, $pid = NULL) {
+    // Check if entity and field exists.
+    $fields = $this->commentManager->getFields($entity->getEntityTypeId());
+    if (empty($fields[$field_name])) {
+      throw new NotFoundHttpException();
+    }
+
+    $account = $this->currentUser();
+
+    // Check if the user has the proper permissions.
+    $access = AccessResult::allowedIfHasPermission($account, 'post comments');
+
+    $status = $entity->{$field_name}->status;
+    $access = $access->andIf(AccessResult::allowedIf($status == CommentItemInterface::OPEN)
+      ->addCacheableDependency($entity));
+
+    // $pid indicates that this is a reply to a comment.
+    if ($pid) {
+      // Check if the user has the proper permissions.
+      $access = $access->andIf(AccessResult::allowedIfHasPermission($account, 'access comments'));
+
+      /// Load the parent comment.
+      $comment = $this->entityManager()->getStorage('comment')->load($pid);
+      // Check if the parent comment is published and belongs to the entity.
+      $access = $access->andIf(AccessResult::allowedIf($comment && $comment->isPublished() && $comment->getCommentedEntityId() == $entity->id()));
+      if ($comment) {
+        $access->addCacheableDependency($comment);
+      }
+    }
+    return $access;
+  }
+
+  /**
+   * Returns a set of nodes' last read timestamps.
+   *
+   * @param \Symfony\Component\HttpFoundation\Request $request
+   *   The request of the page.
+   *
+   * @return \Symfony\Component\HttpFoundation\JsonResponse
+   *   The JSON response.
+   *
+   * @throws \Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException
+   * @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException
+   */
+  public function renderNewCommentsNodeLinks(Request $request) {
+    if ($this->currentUser()->isAnonymous()) {
+      throw new AccessDeniedHttpException();
+    }
+
+    $nids = $request->request->get('node_ids');
+    $field_name = $request->request->get('field_name');
+    if (!isset($nids)) {
+      throw new NotFoundHttpException();
+    }
+    // Only handle up to 100 nodes.
+    $nids = array_slice($nids, 0, 100);
+
+    $links = [];
+    foreach ($nids as $nid) {
+      $node = $this->entityManager->getStorage('node')->load($nid);
+      $new = $this->commentManager->getCountNewComments($node);
+      $page_number = $this->entityManager()->getStorage('comment')
+        ->getNewCommentPageNumber($node->{$field_name}->comment_count, $new, $node, $field_name);
+      $query = $page_number ? ['page' => $page_number] : NULL;
+      $links[$nid] = [
+        'new_comment_count' => (int) $new,
+        'first_new_comment_link' => $this->getUrlGenerator()->generateFromRoute('entity.node.canonical', ['node' => $node->id()], ['query' => $query, 'fragment' => 'new']),
+      ];
+    }
+
+    return new JsonResponse($links);
+  }
+
+}