--- /dev/null
+{% extends "base/class.php.twig" %}
+
+{% block file_path %}
+\Drupal\{{module}}\Form\{{ entity_class }}RevisionRevertForm.
+{% endblock %}
+
+{% block namespace_class %}
+namespace Drupal\{{module}}\Form;
+{% endblock %}
+
+{% block use_class %}
+use Drupal\Core\Datetime\DateFormatterInterface;
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Form\ConfirmFormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Url;
+use Drupal\{{module}}\Entity\{{ entity_class }}Interface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+{% endblock %}
+
+{% block class_declaration %}
+/**
+ * Provides a form for reverting a {{ label }} revision.
+ *
+ * @ingroup {{module}}
+ */
+class {{ entity_class }}RevisionRevertForm extends ConfirmFormBase {% endblock %}
+{% block class_methods %}
+
+ /**
+ * The {{ label }} revision.
+ *
+ * @var \Drupal\{{module}}\Entity\{{ entity_class }}Interface
+ */
+ protected $revision;
+
+ /**
+ * The {{ label }} storage.
+ *
+ * @var \Drupal\Core\Entity\EntityStorageInterface
+ */
+ protected ${{ entity_class }}Storage;
+
+ /**
+ * The date formatter service.
+ *
+ * @var \Drupal\Core\Datetime\DateFormatterInterface
+ */
+ protected $dateFormatter;
+
+ /**
+ * Constructs a new {{ entity_class }}RevisionRevertForm.
+ *
+ * @param \Drupal\Core\Entity\EntityStorageInterface $entity_storage
+ * The {{ label }} storage.
+ * @param \Drupal\Core\Datetime\DateFormatterInterface $date_formatter
+ * The date formatter service.
+ */
+ public function __construct(EntityStorageInterface $entity_storage, DateFormatterInterface $date_formatter) {
+ $this->{{ entity_class }}Storage = $entity_storage;
+ $this->dateFormatter = $date_formatter;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function create(ContainerInterface $container) {
+ return new static(
+ $container->get('entity.manager')->getStorage('{{ entity_name }}'),
+ $container->get('date.formatter')
+ );
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFormId() {
+ return '{{ entity_name }}_revision_revert_confirm';
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getQuestion() {
+ return t('Are you sure you want to revert to the revision from %revision-date?', ['%revision-date' => $this->dateFormatter->format($this->revision->getRevisionCreationTime())]);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getCancelUrl() {
+ return new Url('entity.{{ entity_name }}.version_history', array('{{ entity_name }}' => $this->revision->id()));
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getConfirmText() {
+ return t('Revert');
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getDescription() {
+ return '';
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildForm(array $form, FormStateInterface $form_state, ${{ entity_name }}_revision = NULL) {
+ $this->revision = $this->{{ entity_class }}Storage->loadRevision(${{ entity_name }}_revision);
+ $form = parent::buildForm($form, $form_state);
+
+ return $form;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitForm(array &$form, FormStateInterface $form_state) {
+ // The revision timestamp will be updated when the revision is saved. Keep
+ // the original one for the confirmation message.
+ $original_revision_timestamp = $this->revision->getRevisionCreationTime();
+
+ $this->revision = $this->prepareRevertedRevision($this->revision, $form_state);
+ $this->revision->revision_log = t('Copy of the revision from %date.', ['%date' => $this->dateFormatter->format($original_revision_timestamp)]);
+ $this->revision->save();
+
+ $this->logger('content')->notice('{{ label }}: reverted %title revision %revision.', ['%title' => $this->revision->label(), '%revision' => $this->revision->getRevisionId()]);
+ drupal_set_message(t('{{ label }} %title has been reverted to the revision from %revision-date.', ['%title' => $this->revision->label(), '%revision-date' => $this->dateFormatter->format($original_revision_timestamp)]));
+ $form_state->setRedirect(
+ 'entity.{{ entity_name }}.version_history',
+ array('{{ entity_name }}' => $this->revision->id())
+ );
+ }
+
+ /**
+ * Prepares a revision to be reverted.
+ *
+ * @param \Drupal\{{module}}\Entity\{{ entity_class }}Interface $revision
+ * The revision to be reverted.
+ * @param \Drupal\Core\Form\FormStateInterface $form_state
+ * The current state of the form.
+ *
+ * @return \Drupal\{{module}}\Entity\{{ entity_class }}Interface
+ * The prepared revision ready to be stored.
+ */
+ protected function prepareRevertedRevision({{ entity_class }}Interface $revision, FormStateInterface $form_state) {
+ $revision->setNewRevision();
+ $revision->isDefaultRevision(TRUE);
+ $revision->setRevisionCreationTime(REQUEST_TIME);
+
+ return $revision;
+ }
+{% endblock %}