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diff --git a/web/core/modules/contact/src/MessageForm.php b/web/core/modules/contact/src/MessageForm.php
new file mode 100644
index 000000000..16d41b5ac
--- /dev/null
+++ b/web/core/modules/contact/src/MessageForm.php
@@ -0,0 +1,238 @@
+<?php
+
+namespace Drupal\contact;
+
+use Drupal\Component\Datetime\TimeInterface;
+use Drupal\Core\Datetime\DateFormatterInterface;
+use Drupal\Core\Entity\ContentEntityForm;
+use Drupal\Core\Entity\EntityManagerInterface;
+use Drupal\Core\Entity\EntityTypeBundleInfoInterface;
+use Drupal\Core\Flood\FloodInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Language\LanguageManagerInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Form controller for contact message forms.
+ */
+class MessageForm extends ContentEntityForm {
+
+  /**
+   * The message being used by this form.
+   *
+   * @var \Drupal\contact\MessageInterface
+   */
+  protected $entity;
+
+  /**
+   * The flood control mechanism.
+   *
+   * @var \Drupal\Core\Flood\FloodInterface
+   */
+  protected $flood;
+
+  /**
+   * The language manager service.
+   *
+   * @var \Drupal\Core\Language\LanguageManagerInterface
+   */
+  protected $languageManager;
+
+  /**
+   * The contact mail handler service.
+   *
+   * @var \Drupal\contact\MailHandlerInterface
+   */
+  protected $mailHandler;
+
+  /**
+   * The date formatter service.
+   *
+   * @var \Drupal\Core\Datetime\DateFormatterInterface
+   */
+  protected $dateFormatter;
+
+  /**
+   * Constructs a MessageForm object.
+   *
+   * @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
+   *   The entity manager.
+   * @param \Drupal\Core\Flood\FloodInterface $flood
+   *   The flood control mechanism.
+   * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
+   *   The language manager service.
+   * @param \Drupal\contact\MailHandlerInterface $mail_handler
+   *   The contact mail handler service.
+   * @param \Drupal\Core\Datetime\DateFormatterInterface $date_formatter
+   *   The date service.
+   * @param \Drupal\Core\Entity\EntityTypeBundleInfoInterface $entity_type_bundle_info
+   *   The entity type bundle service.
+   * @param \Drupal\Component\Datetime\TimeInterface $time
+   *   The time service.
+   */
+  public function __construct(EntityManagerInterface $entity_manager, FloodInterface $flood, LanguageManagerInterface $language_manager, MailHandlerInterface $mail_handler, DateFormatterInterface $date_formatter, EntityTypeBundleInfoInterface $entity_type_bundle_info = NULL, TimeInterface $time = NULL) {
+    parent::__construct($entity_manager, $entity_type_bundle_info, $time);
+    $this->flood = $flood;
+    $this->languageManager = $language_manager;
+    $this->mailHandler = $mail_handler;
+    $this->dateFormatter = $date_formatter;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('entity.manager'),
+      $container->get('flood'),
+      $container->get('language_manager'),
+      $container->get('contact.mail_handler'),
+      $container->get('date.formatter'),
+      $container->get('entity_type.bundle.info'),
+      $container->get('datetime.time')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function form(array $form, FormStateInterface $form_state) {
+    $user = $this->currentUser();
+    $message = $this->entity;
+    $form = parent::form($form, $form_state, $message);
+    $form['#attributes']['class'][] = 'contact-form';
+
+    if (!empty($message->preview)) {
+      $form['preview'] = [
+        '#theme_wrappers' => ['container__preview'],
+        '#attributes' => ['class' => ['preview']],
+      ];
+      $form['preview']['message'] = $this->entityManager->getViewBuilder('contact_message')->view($message, 'full');
+    }
+
+    $form['name'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Your name'),
+      '#maxlength' => 255,
+      '#required' => TRUE,
+    ];
+    $form['mail'] = [
+      '#type' => 'email',
+      '#title' => $this->t('Your email address'),
+      '#required' => TRUE,
+    ];
+    if ($user->isAnonymous()) {
+      $form['#attached']['library'][] = 'core/drupal.form';
+      $form['#attributes']['data-user-info-from-browser'] = TRUE;
+    }
+    // Do not allow authenticated users to alter the name or email values to
+    // prevent the impersonation of other users.
+    else {
+      $form['name']['#type'] = 'item';
+      $form['name']['#value'] = $user->getDisplayName();
+      $form['name']['#required'] = FALSE;
+      $form['name']['#plain_text'] = $user->getDisplayName();
+
+      $form['mail']['#type'] = 'item';
+      $form['mail']['#value'] = $user->getEmail();
+      $form['mail']['#required'] = FALSE;
+      $form['mail']['#plain_text'] = $user->getEmail();
+    }
+
+    // The user contact form has a preset recipient.
+    if ($message->isPersonal()) {
+      $form['recipient'] = [
+        '#type' => 'item',
+        '#title' => $this->t('To'),
+        '#value' => $message->getPersonalRecipient()->id(),
+        'name' => [
+          '#theme' => 'username',
+          '#account' => $message->getPersonalRecipient(),
+        ],
+      ];
+    }
+
+    $form['copy'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t('Send yourself a copy'),
+      // Do not allow anonymous users to send themselves a copy, because it can
+      // be abused to spam people.
+      '#access' => $user->isAuthenticated(),
+    ];
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function actions(array $form, FormStateInterface $form_state) {
+    $elements = parent::actions($form, $form_state);
+    $elements['submit']['#value'] = $this->t('Send message');
+    $elements['preview'] = [
+      '#type' => 'submit',
+      '#value' => $this->t('Preview'),
+      '#submit' => ['::submitForm', '::preview'],
+    ];
+    return $elements;
+  }
+
+  /**
+   * Form submission handler for the 'preview' action.
+   */
+  public function preview(array $form, FormStateInterface $form_state) {
+    $message = $this->entity;
+    $message->preview = TRUE;
+    $form_state->setRebuild();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validateForm(array &$form, FormStateInterface $form_state) {
+    $message = parent::validateForm($form, $form_state);
+
+    // Check if flood control has been activated for sending emails.
+    if (!$this->currentUser()->hasPermission('administer contact forms') && (!$message->isPersonal() || !$this->currentUser()->hasPermission('administer users'))) {
+      $limit = $this->config('contact.settings')->get('flood.limit');
+      $interval = $this->config('contact.settings')->get('flood.interval');
+
+      if (!$this->flood->isAllowed('contact', $limit, $interval)) {
+        $form_state->setErrorByName('', $this->t('You cannot send more than %limit messages in @interval. Try again later.', [
+          '%limit' => $limit,
+          '@interval' => $this->dateFormatter->formatInterval($interval),
+        ]));
+      }
+    }
+
+    return $message;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function save(array $form, FormStateInterface $form_state) {
+    $message = $this->entity;
+    $user = $this->currentUser();
+    // Save the message. In core this is a no-op but should contrib wish to
+    // implement message storage, this will make the task of swapping in a real
+    // storage controller straight-forward.
+    $message->save();
+    $this->mailHandler->sendMailMessages($message, $user);
+    $contact_form = $message->getContactForm();
+
+    $this->flood->register('contact', $this->config('contact.settings')->get('flood.interval'));
+    if ($submission_message = $contact_form->getMessage()) {
+      drupal_set_message($submission_message);
+    }
+
+    // To avoid false error messages caused by flood control, redirect away from
+    // the contact form; either to the contacted user account or the front page.
+    if ($message->isPersonal() && $user->hasPermission('access user profiles')) {
+      $form_state->setRedirectUrl($message->getPersonalRecipient()->urlInfo());
+    }
+    else {
+      $form_state->setRedirectUrl($contact_form->getRedirectUrl());
+    }
+  }
+
+}