+<?php
+
+namespace Drupal\entity\Controller;
+
+use Drupal\Component\Utility\Xss;
+use Drupal\Core\Access\AccessResult;
+use Drupal\Core\Controller\ControllerBase;
+use Drupal\Core\Datetime\DateFormatterInterface;
+use Drupal\Core\Entity\ContentEntityInterface;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Render\RendererInterface;
+use Drupal\Core\Routing\RouteMatchInterface;
+use Drupal\Core\Entity\RevisionLogInterface;
+use Drupal\user\EntityOwnerInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a controller which shows the revision history.
+ *
+ * This controller leverages the revision controller trait, which is agnostic to
+ * any entity type, by using \Drupal\Core\Entity\RevisionLogInterface.
+ */
+class RevisionOverviewController extends ControllerBase {
+
+ use RevisionControllerTrait;
+
+ /**
+ * The date formatter.
+ *
+ * @var \Drupal\Core\Datetime\DateFormatterInterface
+ */
+ protected $dateFormatter;
+
+ /**
+ * The renderer.
+ *
+ * @var \Drupal\Core\Render\RendererInterface
+ */
+ protected $renderer;
+
+ /**
+ * Creates a new RevisionOverviewController instance.
+ *
+ * @param \Drupal\Core\Datetime\DateFormatterInterface $date_formatter
+ * The date formatter.
+ */
+ public function __construct(DateFormatterInterface $date_formatter, RendererInterface $renderer) {
+ $this->dateFormatter = $date_formatter;
+ $this->renderer = $renderer;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function create(ContainerInterface $container) {
+ return new static($container->get('date.formatter'), $container->get('renderer'));
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function hasDeleteRevisionAccess(EntityInterface $entity) {
+ return $this->currentUser()->hasPermission("delete all {$entity->id()} revisions");
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function buildRevertRevisionLink(EntityInterface $entity_revision) {
+ if ($entity_revision->hasLinkTemplate('revision-revert-form')) {
+ return [
+ 'title' => t('Revert'),
+ 'url' => $entity_revision->toUrl('revision-revert-form'),
+ ];
+ }
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function buildDeleteRevisionLink(EntityInterface $entity_revision) {
+ if ($entity_revision->hasLinkTemplate('revision-delete-form')) {
+ return [
+ 'title' => t('Delete'),
+ 'url' => $entity_revision->toUrl('revision-delete-form'),
+ ];
+ }
+ }
+
+ /**
+ * Generates an overview table of older revisions of an entity.
+ *
+ * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
+ * The route match.
+ *
+ * @return array
+ * A render array.
+ */
+ public function revisionOverviewController(RouteMatchInterface $route_match) {
+ return $this->revisionOverview($route_match->getParameter($route_match->getRouteObject()->getOption('entity_type_id')));
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function getRevisionDescription(ContentEntityInterface $revision, $is_default = FALSE) {
+ /** @var \Drupal\Core\Entity\ContentEntityInterface|\Drupal\user\EntityOwnerInterface|\Drupal\Core\Entity\RevisionLogInterface $revision */
+ if ($revision instanceof RevisionLogInterface) {
+ // Use revision link to link to revisions that are not active.
+ $date = $this->dateFormatter->format($revision->getRevisionCreationTime(), 'short');
+ $link = $revision->toLink($date, 'revision');
+
+ // @todo: Simplify this when https://www.drupal.org/node/2334319 lands.
+ $username = [
+ '#theme' => 'username',
+ '#account' => $revision->getRevisionUser(),
+ ];
+ $username = $this->renderer->render($username);
+ }
+ else {
+ $link = $revision->toLink($revision->label(), 'revision');
+ $username = '';
+
+ }
+
+ $markup = '';
+ if ($revision instanceof RevisionLogInterface) {
+ $markup = $revision->getRevisionLogMessage();
+ }
+
+ if ($username) {
+ $template = '{% trans %}{{ date }} by {{ username }}{% endtrans %}{% if message %}<p class="revision-log">{{ message }}</p>{% endif %}';
+ }
+ else {
+ $template = '{% trans %} {{ date }} {% endtrans %}{% if message %}<p class="revision-log">{{ message }}</p>{% endif %}';
+ }
+
+ $column = [
+ 'data' => [
+ '#type' => 'inline_template',
+ '#template' => $template,
+ '#context' => [
+ 'date' => $link->toString(),
+ 'username' => $username,
+ 'message' => ['#markup' => $markup, '#allowed_tags' => Xss::getHtmlTagList()],
+ ],
+ ],
+ ];
+ return $column;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function hasRevertRevisionAccess(EntityInterface $entity) {
+ return AccessResult::allowedIfHasPermission($this->currentUser(), "revert all {$entity->getEntityTypeId()} revisions")->orIf(
+ AccessResult::allowedIfHasPermission($this->currentUser(), "revert {$entity->bundle()} {$entity->getEntityTypeId()} revisions")
+ );
+ }
+
+}