--- /dev/null
+<?php
+
+namespace Drupal\node;
+
+use Drupal\Core\Access\AccessResult;
+use Drupal\Core\Entity\EntityHandlerInterface;
+use Drupal\Core\Entity\EntityTypeInterface;
+use Drupal\Core\Field\FieldDefinitionInterface;
+use Drupal\Core\Field\FieldItemListInterface;
+use Drupal\Core\Entity\EntityAccessControlHandler;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Session\AccountInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Defines the access control handler for the node entity type.
+ *
+ * @see \Drupal\node\Entity\Node
+ * @ingroup node_access
+ */
+class NodeAccessControlHandler extends EntityAccessControlHandler implements NodeAccessControlHandlerInterface, EntityHandlerInterface {
+
+ /**
+ * The node grant storage.
+ *
+ * @var \Drupal\node\NodeGrantDatabaseStorageInterface
+ */
+ protected $grantStorage;
+
+ /**
+ * Constructs a NodeAccessControlHandler object.
+ *
+ * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+ * The entity type definition.
+ * @param \Drupal\node\NodeGrantDatabaseStorageInterface $grant_storage
+ * The node grant storage.
+ */
+ public function __construct(EntityTypeInterface $entity_type, NodeGrantDatabaseStorageInterface $grant_storage) {
+ parent::__construct($entity_type);
+ $this->grantStorage = $grant_storage;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function createInstance(ContainerInterface $container, EntityTypeInterface $entity_type) {
+ return new static(
+ $entity_type,
+ $container->get('node.grant_storage')
+ );
+ }
+
+
+ /**
+ * {@inheritdoc}
+ */
+ public function access(EntityInterface $entity, $operation, AccountInterface $account = NULL, $return_as_object = FALSE) {
+ $account = $this->prepareUser($account);
+
+ if ($account->hasPermission('bypass node access')) {
+ $result = AccessResult::allowed()->cachePerPermissions();
+ return $return_as_object ? $result : $result->isAllowed();
+ }
+ if (!$account->hasPermission('access content')) {
+ $result = AccessResult::forbidden("The 'access content' permission is required.")->cachePerPermissions();
+ return $return_as_object ? $result : $result->isAllowed();
+ }
+ $result = parent::access($entity, $operation, $account, TRUE)->cachePerPermissions();
+
+ return $return_as_object ? $result : $result->isAllowed();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function createAccess($entity_bundle = NULL, AccountInterface $account = NULL, array $context = [], $return_as_object = FALSE) {
+ $account = $this->prepareUser($account);
+
+ if ($account->hasPermission('bypass node access')) {
+ $result = AccessResult::allowed()->cachePerPermissions();
+ return $return_as_object ? $result : $result->isAllowed();
+ }
+ if (!$account->hasPermission('access content')) {
+ $result = AccessResult::forbidden()->cachePerPermissions();
+ return $return_as_object ? $result : $result->isAllowed();
+ }
+
+ $result = parent::createAccess($entity_bundle, $account, $context, TRUE)->cachePerPermissions();
+ return $return_as_object ? $result : $result->isAllowed();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function checkAccess(EntityInterface $node, $operation, AccountInterface $account) {
+ /** @var \Drupal\node\NodeInterface $node */
+
+ // Fetch information from the node object if possible.
+ $status = $node->isPublished();
+ $uid = $node->getOwnerId();
+
+ // Check if authors can view their own unpublished nodes.
+ if ($operation === 'view' && !$status && $account->hasPermission('view own unpublished content') && $account->isAuthenticated() && $account->id() == $uid) {
+ return AccessResult::allowed()->cachePerPermissions()->cachePerUser()->addCacheableDependency($node);
+ }
+
+ // Evaluate node grants.
+ return $this->grantStorage->access($node, $operation, $account);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function checkCreateAccess(AccountInterface $account, array $context, $entity_bundle = NULL) {
+ return AccessResult::allowedIf($account->hasPermission('create ' . $entity_bundle . ' content'))->cachePerPermissions();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function checkFieldAccess($operation, FieldDefinitionInterface $field_definition, AccountInterface $account, FieldItemListInterface $items = NULL) {
+ // Only users with the administer nodes permission can edit administrative
+ // fields.
+ $administrative_fields = ['uid', 'status', 'created', 'promote', 'sticky'];
+ if ($operation == 'edit' && in_array($field_definition->getName(), $administrative_fields, TRUE)) {
+ return AccessResult::allowedIfHasPermission($account, 'administer nodes');
+ }
+
+ // No user can change read only fields.
+ $read_only_fields = ['revision_timestamp', 'revision_uid'];
+ if ($operation == 'edit' && in_array($field_definition->getName(), $read_only_fields, TRUE)) {
+ return AccessResult::forbidden();
+ }
+
+ // Users have access to the revision_log field either if they have
+ // administrative permissions or if the new revision option is enabled.
+ if ($operation == 'edit' && $field_definition->getName() == 'revision_log') {
+ if ($account->hasPermission('administer nodes')) {
+ return AccessResult::allowed()->cachePerPermissions();
+ }
+ return AccessResult::allowedIf($items->getEntity()->type->entity->isNewRevision())->cachePerPermissions();
+ }
+ return parent::checkFieldAccess($operation, $field_definition, $account, $items);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function acquireGrants(NodeInterface $node) {
+ $grants = $this->moduleHandler->invokeAll('node_access_records', [$node]);
+ // Let modules alter the grants.
+ $this->moduleHandler->alter('node_access_records', $grants, $node);
+ // If no grants are set and the node is published, then use the default grant.
+ if (empty($grants) && $node->isPublished()) {
+ $grants[] = ['realm' => 'all', 'gid' => 0, 'grant_view' => 1, 'grant_update' => 0, 'grant_delete' => 0];
+ }
+ return $grants;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function writeGrants(NodeInterface $node, $delete = TRUE) {
+ $grants = $this->acquireGrants($node);
+ $this->grantStorage->write($node, $grants, NULL, $delete);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function writeDefaultGrant() {
+ $this->grantStorage->writeDefault();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function deleteGrants() {
+ $this->grantStorage->delete();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function countGrants() {
+ return $this->grantStorage->count();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function checkAllGrants(AccountInterface $account) {
+ return $this->grantStorage->checkAll($account);
+ }
+
+}