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diff --git a/web/core/modules/comment/src/CommentManager.php b/web/core/modules/comment/src/CommentManager.php
new file mode 100644
index 000000000..80cc427e3
--- /dev/null
+++ b/web/core/modules/comment/src/CommentManager.php
@@ -0,0 +1,219 @@
+<?php
+
+namespace Drupal\comment;
+
+use Drupal\comment\Plugin\Field\FieldType\CommentItemInterface;
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Entity\EntityManagerInterface;
+use Drupal\Core\Entity\FieldableEntityInterface;
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\Core\Routing\UrlGeneratorInterface;
+use Drupal\Core\Routing\UrlGeneratorTrait;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+use Drupal\Core\StringTranslation\TranslationInterface;
+use Drupal\field\Entity\FieldStorageConfig;
+use Drupal\field\Entity\FieldConfig;
+use Drupal\user\RoleInterface;
+
+/**
+ * Comment manager contains common functions to manage comment fields.
+ */
+class CommentManager implements CommentManagerInterface {
+  use StringTranslationTrait;
+  use UrlGeneratorTrait;
+
+  /**
+   * The entity manager service.
+   *
+   * @var \Drupal\Core\Entity\EntityManagerInterface
+   */
+  protected $entityManager;
+
+  /**
+   * Whether the \Drupal\user\RoleInterface::AUTHENTICATED_ID can post comments.
+   *
+   * @var bool
+   */
+  protected $authenticatedCanPostComments;
+
+  /**
+   * The user settings config object.
+   *
+   * @var \Drupal\Core\Config\Config
+   */
+  protected $userConfig;
+
+  /**
+   * The module handler service.
+   *
+   * @var \Drupal\Core\Extension\ModuleHandlerInterface
+   */
+  protected $moduleHandler;
+
+  /**
+   * The current user.
+   *
+   * @var \Drupal\Core\Session\AccountInterface
+   */
+  protected $currentUser;
+
+  /**
+   * Construct the CommentManager object.
+   *
+   * @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
+   *   The entity manager service.
+   * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
+   *   The config factory.
+   * @param \Drupal\Core\StringTranslation\TranslationInterface $string_translation
+   *   The string translation service.
+   * @param \Drupal\Core\Routing\UrlGeneratorInterface $url_generator
+   *   The url generator service.
+   *  @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
+   *   The module handler service.
+   * @param \Drupal\Core\Session\AccountInterface $current_user
+   *   The current user.
+   */
+  public function __construct(EntityManagerInterface $entity_manager, ConfigFactoryInterface $config_factory, TranslationInterface $string_translation, UrlGeneratorInterface $url_generator, ModuleHandlerInterface $module_handler, AccountInterface $current_user) {
+    $this->entityManager = $entity_manager;
+    $this->userConfig = $config_factory->get('user.settings');
+    $this->stringTranslation = $string_translation;
+    $this->urlGenerator = $url_generator;
+    $this->moduleHandler = $module_handler;
+    $this->currentUser = $current_user;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFields($entity_type_id) {
+    $entity_type = $this->entityManager->getDefinition($entity_type_id);
+    if (!$entity_type->entityClassImplements(FieldableEntityInterface::class)) {
+      return [];
+    }
+
+    $map = $this->entityManager->getFieldMapByFieldType('comment');
+    return isset($map[$entity_type_id]) ? $map[$entity_type_id] : [];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function addBodyField($comment_type_id) {
+    if (!FieldConfig::loadByName('comment', $comment_type_id, 'comment_body')) {
+      // Attaches the body field by default.
+      $field = $this->entityManager->getStorage('field_config')->create([
+        'label' => 'Comment',
+        'bundle' => $comment_type_id,
+        'required' => TRUE,
+        'field_storage' => FieldStorageConfig::loadByName('comment', 'comment_body'),
+      ]);
+      $field->save();
+
+      // Assign widget settings for the 'default' form mode.
+      entity_get_form_display('comment', $comment_type_id, 'default')
+        ->setComponent('comment_body', [
+          'type' => 'text_textarea',
+        ])
+        ->save();
+
+      // Assign display settings for the 'default' view mode.
+      entity_get_display('comment', $comment_type_id, 'default')
+        ->setComponent('comment_body', [
+          'label' => 'hidden',
+          'type' => 'text_default',
+          'weight' => 0,
+        ])
+        ->save();
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function forbiddenMessage(EntityInterface $entity, $field_name) {
+    if (!isset($this->authenticatedCanPostComments)) {
+      // We only output a link if we are certain that users will get the
+      // permission to post comments by logging in.
+      $this->authenticatedCanPostComments = $this->entityManager
+        ->getStorage('user_role')
+        ->load(RoleInterface::AUTHENTICATED_ID)
+        ->hasPermission('post comments');
+    }
+
+    if ($this->authenticatedCanPostComments) {
+      // We cannot use the redirect.destination service here because these links
+      // sometimes appear on /node and taxonomy listing pages.
+      if ($entity->get($field_name)->getFieldDefinition()->getSetting('form_location') == CommentItemInterface::FORM_SEPARATE_PAGE) {
+        $comment_reply_parameters = [
+          'entity_type' => $entity->getEntityTypeId(),
+          'entity' => $entity->id(),
+          'field_name' => $field_name,
+        ];
+        $destination = ['destination' => $this->url('comment.reply', $comment_reply_parameters, ['fragment' => 'comment-form'])];
+      }
+      else {
+        $destination = ['destination' => $entity->url('canonical', ['fragment' => 'comment-form'])];
+      }
+
+      if ($this->userConfig->get('register') != USER_REGISTER_ADMINISTRATORS_ONLY) {
+        // Users can register themselves.
+        return $this->t('<a href=":login">Log in</a> or <a href=":register">register</a> to post comments', [
+          ':login' => $this->urlGenerator->generateFromRoute('user.login', [], ['query' => $destination]),
+          ':register' => $this->urlGenerator->generateFromRoute('user.register', [], ['query' => $destination]),
+        ]);
+      }
+      else {
+        // Only admins can add new users, no public registration.
+        return $this->t('<a href=":login">Log in</a> to post comments', [
+          ':login' => $this->urlGenerator->generateFromRoute('user.login', [], ['query' => $destination]),
+        ]);
+      }
+    }
+    return '';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCountNewComments(EntityInterface $entity, $field_name = NULL, $timestamp = 0) {
+    // @todo Replace module handler with optional history service injection
+    //   after https://www.drupal.org/node/2081585.
+    if ($this->currentUser->isAuthenticated() && $this->moduleHandler->moduleExists('history')) {
+      // Retrieve the timestamp at which the current user last viewed this entity.
+      if (!$timestamp) {
+        if ($entity->getEntityTypeId() == 'node') {
+          $timestamp = history_read($entity->id());
+        }
+        else {
+          $function = $entity->getEntityTypeId() . '_last_viewed';
+          if (function_exists($function)) {
+            $timestamp = $function($entity->id());
+          }
+          else {
+            // Default to 30 days ago.
+            // @todo Remove once https://www.drupal.org/node/1029708 lands.
+            $timestamp = COMMENT_NEW_LIMIT;
+          }
+        }
+      }
+      $timestamp = ($timestamp > HISTORY_READ_LIMIT ? $timestamp : HISTORY_READ_LIMIT);
+
+      // Use the timestamp to retrieve the number of new comments.
+      $query = $this->entityManager->getStorage('comment')->getQuery()
+        ->condition('entity_type', $entity->getEntityTypeId())
+        ->condition('entity_id', $entity->id())
+        ->condition('created', $timestamp, '>')
+        ->condition('status', CommentInterface::PUBLISHED);
+      if ($field_name) {
+        // Limit to a particular field.
+        $query->condition('field_name', $field_name);
+      }
+
+      return $query->count()->execute();
+    }
+    return FALSE;
+  }
+
+}