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diff --git a/web/core/modules/comment/src/Plugin/Action/UnpublishByKeywordComment.php b/web/core/modules/comment/src/Plugin/Action/UnpublishByKeywordComment.php
new file mode 100644
index 000000000..ec1b268d7
--- /dev/null
+++ b/web/core/modules/comment/src/Plugin/Action/UnpublishByKeywordComment.php
@@ -0,0 +1,128 @@
+<?php
+
+namespace Drupal\comment\Plugin\Action;
+
+use Drupal\Component\Utility\Tags;
+use Drupal\Core\Action\ConfigurableActionBase;
+use Drupal\Core\Entity\EntityViewBuilderInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\Core\Render\RendererInterface;
+use Drupal\Core\Session\AccountInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Unpublishes a comment containing certain keywords.
+ *
+ * @Action(
+ *   id = "comment_unpublish_by_keyword_action",
+ *   label = @Translation("Unpublish comment containing keyword(s)"),
+ *   type = "comment"
+ * )
+ */
+class UnpublishByKeywordComment extends ConfigurableActionBase implements ContainerFactoryPluginInterface {
+
+  /**
+   * The comment entity builder handler.
+   *
+   * @var \Drupal\Core\Entity\EntityViewBuilderInterface
+   */
+  protected $viewBuilder;
+
+  /**
+   * The renderer.
+   *
+   * @var \Drupal\Core\Render\RendererInterface
+   */
+  protected $renderer;
+
+  /**
+   * Constructs a UnpublishByKeywordComment object.
+   *
+   * @param array $configuration
+   *   A configuration array containing information about the plugin instance.
+   * @param string $plugin_id
+   *   The plugin ID for the plugin instance.
+   * @param mixed $plugin_definition
+   *   The plugin implementation definition.
+   * @param \Drupal\Core\Entity\EntityViewBuilderInterface $comment_view_builder
+   *   The comment entity builder handler.
+   * @param \Drupal\Core\Render\RendererInterface $renderer
+   *   The renderer.
+   */
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, EntityViewBuilderInterface $comment_view_builder, RendererInterface $renderer) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition);
+
+    $this->viewBuilder = $comment_view_builder;
+    $this->renderer = $renderer;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $container->get('entity.manager')->getViewBuilder('comment'),
+      $container->get('renderer')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function execute($comment = NULL) {
+    $build = $this->viewBuilder->view($comment);
+    $text = $this->renderer->renderPlain($build);
+    foreach ($this->configuration['keywords'] as $keyword) {
+      if (strpos($text, $keyword) !== FALSE) {
+        $comment->setPublished(FALSE);
+        $comment->save();
+        break;
+      }
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defaultConfiguration() {
+    return [
+      'keywords' => [],
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
+    $form['keywords'] = [
+      '#title' => $this->t('Keywords'),
+      '#type' => 'textarea',
+      '#description' => $this->t('The comment will be unpublished if it contains any of the phrases above. Use a case-sensitive, comma-separated list of phrases. Example: funny, bungee jumping, "Company, Inc."'),
+      '#default_value' => Tags::implode($this->configuration['keywords']),
+    ];
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
+    $this->configuration['keywords'] = Tags::explode($form_state->getValue('keywords'));
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function access($object, AccountInterface $account = NULL, $return_as_object = FALSE) {
+    /** @var \Drupal\comment\CommentInterface $object */
+    $result = $object->access('update', $account, TRUE)
+      ->andIf($object->status->access('edit', $account, TRUE));
+
+    return $return_as_object ? $result : $result->isAllowed();
+  }
+
+}