--- /dev/null
+<?php
+
+namespace Drupal\node\Controller;
+
+use Drupal\Component\Utility\Xss;
+use Drupal\Core\Controller\ControllerBase;
+use Drupal\Core\Datetime\DateFormatterInterface;
+use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Drupal\Core\Render\RendererInterface;
+use Drupal\Core\Url;
+use Drupal\node\NodeStorageInterface;
+use Drupal\node\NodeTypeInterface;
+use Drupal\node\NodeInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Returns responses for Node routes.
+ */
+class NodeController extends ControllerBase implements ContainerInjectionInterface {
+
+ /**
+ * The date formatter service.
+ *
+ * @var \Drupal\Core\Datetime\DateFormatterInterface
+ */
+ protected $dateFormatter;
+
+ /**
+ * The renderer service.
+ *
+ * @var \Drupal\Core\Render\RendererInterface
+ */
+ protected $renderer;
+
+ /**
+ * Constructs a NodeController object.
+ *
+ * @param \Drupal\Core\Datetime\DateFormatterInterface $date_formatter
+ * The date formatter service.
+ * @param \Drupal\Core\Render\RendererInterface $renderer
+ * The renderer service.
+ */
+ 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')
+ );
+ }
+
+ /**
+ * Displays add content links for available content types.
+ *
+ * Redirects to node/add/[type] if only one content type is available.
+ *
+ * @return array|\Symfony\Component\HttpFoundation\RedirectResponse
+ * A render array for a list of the node types that can be added; however,
+ * if there is only one node type defined for the site, the function
+ * will return a RedirectResponse to the node add page for that one node
+ * type.
+ */
+ public function addPage() {
+ $build = [
+ '#theme' => 'node_add_list',
+ '#cache' => [
+ 'tags' => $this->entityManager()->getDefinition('node_type')->getListCacheTags(),
+ ],
+ ];
+
+ $content = [];
+
+ // Only use node types the user has access to.
+ foreach ($this->entityManager()->getStorage('node_type')->loadMultiple() as $type) {
+ $access = $this->entityManager()->getAccessControlHandler('node')->createAccess($type->id(), NULL, [], TRUE);
+ if ($access->isAllowed()) {
+ $content[$type->id()] = $type;
+ }
+ $this->renderer->addCacheableDependency($build, $access);
+ }
+
+ // Bypass the node/add listing if only one content type is available.
+ if (count($content) == 1) {
+ $type = array_shift($content);
+ return $this->redirect('node.add', ['node_type' => $type->id()]);
+ }
+
+ $build['#content'] = $content;
+
+ return $build;
+ }
+
+ /**
+ * Provides the node submission form.
+ *
+ * @param \Drupal\node\NodeTypeInterface $node_type
+ * The node type entity for the node.
+ *
+ * @return array
+ * A node submission form.
+ */
+ public function add(NodeTypeInterface $node_type) {
+ $node = $this->entityManager()->getStorage('node')->create([
+ 'type' => $node_type->id(),
+ ]);
+
+ $form = $this->entityFormBuilder()->getForm($node);
+
+ return $form;
+ }
+
+ /**
+ * Displays a node revision.
+ *
+ * @param int $node_revision
+ * The node revision ID.
+ *
+ * @return array
+ * An array suitable for drupal_render().
+ */
+ public function revisionShow($node_revision) {
+ $node = $this->entityManager()->getStorage('node')->loadRevision($node_revision);
+ $node = $this->entityManager()->getTranslationFromContext($node);
+ $node_view_controller = new NodeViewController($this->entityManager, $this->renderer, $this->currentUser());
+ $page = $node_view_controller->view($node);
+ unset($page['nodes'][$node->id()]['#cache']);
+ return $page;
+ }
+
+ /**
+ * Page title callback for a node revision.
+ *
+ * @param int $node_revision
+ * The node revision ID.
+ *
+ * @return string
+ * The page title.
+ */
+ public function revisionPageTitle($node_revision) {
+ $node = $this->entityManager()->getStorage('node')->loadRevision($node_revision);
+ return $this->t('Revision of %title from %date', ['%title' => $node->label(), '%date' => format_date($node->getRevisionCreationTime())]);
+ }
+
+ /**
+ * Generates an overview table of older revisions of a node.
+ *
+ * @param \Drupal\node\NodeInterface $node
+ * A node object.
+ *
+ * @return array
+ * An array as expected by drupal_render().
+ */
+ public function revisionOverview(NodeInterface $node) {
+ $account = $this->currentUser();
+ $langcode = $node->language()->getId();
+ $langname = $node->language()->getName();
+ $languages = $node->getTranslationLanguages();
+ $has_translations = (count($languages) > 1);
+ $node_storage = $this->entityManager()->getStorage('node');
+ $type = $node->getType();
+
+ $build['#title'] = $has_translations ? $this->t('@langname revisions for %title', ['@langname' => $langname, '%title' => $node->label()]) : $this->t('Revisions for %title', ['%title' => $node->label()]);
+ $header = [$this->t('Revision'), $this->t('Operations')];
+
+ $revert_permission = (($account->hasPermission("revert $type revisions") || $account->hasPermission('revert all revisions') || $account->hasPermission('administer nodes')) && $node->access('update'));
+ $delete_permission = (($account->hasPermission("delete $type revisions") || $account->hasPermission('delete all revisions') || $account->hasPermission('administer nodes')) && $node->access('delete'));
+
+ $rows = [];
+ $default_revision = $node->getRevisionId();
+
+ foreach ($this->getRevisionIds($node, $node_storage) as $vid) {
+ /** @var \Drupal\node\NodeInterface $revision */
+ $revision = $node_storage->loadRevision($vid);
+ // Only show revisions that are affected by the language that is being
+ // displayed.
+ if ($revision->hasTranslation($langcode) && $revision->getTranslation($langcode)->isRevisionTranslationAffected()) {
+ $username = [
+ '#theme' => 'username',
+ '#account' => $revision->getRevisionUser(),
+ ];
+
+ // Use revision link to link to revisions that are not active.
+ $date = $this->dateFormatter->format($revision->revision_timestamp->value, 'short');
+ if ($vid != $node->getRevisionId()) {
+ $link = $this->l($date, new Url('entity.node.revision', ['node' => $node->id(), 'node_revision' => $vid]));
+ }
+ else {
+ $link = $node->link($date);
+ }
+
+ $row = [];
+ $column = [
+ 'data' => [
+ '#type' => 'inline_template',
+ '#template' => '{% trans %}{{ date }} by {{ username }}{% endtrans %}{% if message %}<p class="revision-log">{{ message }}</p>{% endif %}',
+ '#context' => [
+ 'date' => $link,
+ 'username' => $this->renderer->renderPlain($username),
+ 'message' => ['#markup' => $revision->revision_log->value, '#allowed_tags' => Xss::getHtmlTagList()],
+ ],
+ ],
+ ];
+ // @todo Simplify once https://www.drupal.org/node/2334319 lands.
+ $this->renderer->addCacheableDependency($column['data'], $username);
+ $row[] = $column;
+
+ if ($vid == $default_revision) {
+ $row[] = [
+ 'data' => [
+ '#prefix' => '<em>',
+ '#markup' => $this->t('Current revision'),
+ '#suffix' => '</em>',
+ ],
+ ];
+
+ $rows[] = [
+ 'data' => $row,
+ 'class' => ['revision-current'],
+ ];
+ }
+ else {
+ $links = [];
+ if ($revert_permission) {
+ $links['revert'] = [
+ 'title' => $vid < $node->getRevisionId() ? $this->t('Revert') : $this->t('Set as current revision'),
+ 'url' => $has_translations ?
+ Url::fromRoute('node.revision_revert_translation_confirm', ['node' => $node->id(), 'node_revision' => $vid, 'langcode' => $langcode]) :
+ Url::fromRoute('node.revision_revert_confirm', ['node' => $node->id(), 'node_revision' => $vid]),
+ ];
+ }
+
+ if ($delete_permission) {
+ $links['delete'] = [
+ 'title' => $this->t('Delete'),
+ 'url' => Url::fromRoute('node.revision_delete_confirm', ['node' => $node->id(), 'node_revision' => $vid]),
+ ];
+ }
+
+ $row[] = [
+ 'data' => [
+ '#type' => 'operations',
+ '#links' => $links,
+ ],
+ ];
+
+ $rows[] = $row;
+ }
+ }
+ }
+
+ $build['node_revisions_table'] = [
+ '#theme' => 'table',
+ '#rows' => $rows,
+ '#header' => $header,
+ '#attached' => [
+ 'library' => ['node/drupal.node.admin'],
+ ],
+ '#attributes' => ['class' => 'node-revision-table'],
+ ];
+
+ $build['pager'] = ['#type' => 'pager'];
+
+ return $build;
+ }
+
+ /**
+ * The _title_callback for the node.add route.
+ *
+ * @param \Drupal\node\NodeTypeInterface $node_type
+ * The current node.
+ *
+ * @return string
+ * The page title.
+ */
+ public function addPageTitle(NodeTypeInterface $node_type) {
+ return $this->t('Create @name', ['@name' => $node_type->label()]);
+ }
+
+ /**
+ * Gets a list of node revision IDs for a specific node.
+ *
+ * @param \Drupal\node\NodeInterface $node
+ * The node entity.
+ * @param \Drupal\node\NodeStorageInterface $node_storage
+ * The node storage handler.
+ *
+ * @return int[]
+ * Node revision IDs (in descending order).
+ */
+ protected function getRevisionIds(NodeInterface $node, NodeStorageInterface $node_storage) {
+ $result = $node_storage->getQuery()
+ ->allRevisions()
+ ->condition($node->getEntityType()->getKey('id'), $node->id())
+ ->sort($node->getEntityType()->getKey('revision'), 'DESC')
+ ->pager(50)
+ ->execute();
+ return array_keys($result);
+ }
+
+}