--- /dev/null
+<?php
+
+namespace Drupal\Core\Entity;
+
+use Drupal\Core\Form\ConfirmFormHelper;
+use Drupal\Core\Form\ConfirmFormInterface;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Provides a generic base class for an entity-based confirmation form.
+ *
+ * @ingroup entity_api
+ */
+abstract class EntityConfirmFormBase extends EntityForm implements ConfirmFormInterface {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getBaseFormId() {
+ return $this->entity->getEntityTypeId() . '_confirm_form';
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getDescription() {
+ return $this->t('This action cannot be undone.');
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getConfirmText() {
+ return $this->t('Confirm');
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getCancelText() {
+ return $this->t('Cancel');
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFormName() {
+ return 'confirm';
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildForm(array $form, FormStateInterface $form_state) {
+ $form = parent::buildForm($form, $form_state);
+
+ $form['#title'] = $this->getQuestion();
+
+ $form['#attributes']['class'][] = 'confirmation';
+ $form['description'] = ['#markup' => $this->getDescription()];
+ $form[$this->getFormName()] = ['#type' => 'hidden', '#value' => 1];
+
+ // By default, render the form using theme_confirm_form().
+ if (!isset($form['#theme'])) {
+ $form['#theme'] = 'confirm_form';
+ }
+ return $form;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function actions(array $form, FormStateInterface $form_state) {
+ return [
+ 'submit' => [
+ '#type' => 'submit',
+ '#value' => $this->getConfirmText(),
+ '#submit' => [
+ [$this, 'submitForm'],
+ ],
+ ],
+ 'cancel' => ConfirmFormHelper::buildCancelLink($this, $this->getRequest()),
+ ];
+ }
+
+ /**
+ * {@inheritdoc}
+ *
+ * The save() method is not used in EntityConfirmFormBase. This overrides the
+ * default implementation that saves the entity.
+ *
+ * Confirmation forms should override submitForm() instead for their logic.
+ */
+ public function save(array $form, FormStateInterface $form_state) {}
+
+ /**
+ * {@inheritdoc}
+ *
+ * The delete() method is not used in EntityConfirmFormBase. This overrides
+ * the default implementation that redirects to the delete-form confirmation
+ * form.
+ *
+ * Confirmation forms should override submitForm() instead for their logic.
+ */
+ public function delete(array $form, FormStateInterface $form_state) {}
+
+}