Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\node;
Chris@0: 
Chris@0: use Drupal\Core\Access\AccessResult;
Chris@0: use Drupal\Core\Entity\EntityHandlerInterface;
Chris@0: use Drupal\Core\Entity\EntityTypeInterface;
Chris@0: use Drupal\Core\Field\FieldDefinitionInterface;
Chris@0: use Drupal\Core\Field\FieldItemListInterface;
Chris@0: use Drupal\Core\Entity\EntityAccessControlHandler;
Chris@0: use Drupal\Core\Entity\EntityInterface;
Chris@0: use Drupal\Core\Session\AccountInterface;
Chris@0: use Symfony\Component\DependencyInjection\ContainerInterface;
Chris@0: 
Chris@0: /**
Chris@0:  * Defines the access control handler for the node entity type.
Chris@0:  *
Chris@0:  * @see \Drupal\node\Entity\Node
Chris@0:  * @ingroup node_access
Chris@0:  */
Chris@0: class NodeAccessControlHandler extends EntityAccessControlHandler implements NodeAccessControlHandlerInterface, EntityHandlerInterface {
Chris@0: 
Chris@0:   /**
Chris@0:    * The node grant storage.
Chris@0:    *
Chris@0:    * @var \Drupal\node\NodeGrantDatabaseStorageInterface
Chris@0:    */
Chris@0:   protected $grantStorage;
Chris@0: 
Chris@0:   /**
Chris@0:    * Constructs a NodeAccessControlHandler object.
Chris@0:    *
Chris@0:    * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
Chris@0:    *   The entity type definition.
Chris@0:    * @param \Drupal\node\NodeGrantDatabaseStorageInterface $grant_storage
Chris@0:    *   The node grant storage.
Chris@0:    */
Chris@0:   public function __construct(EntityTypeInterface $entity_type, NodeGrantDatabaseStorageInterface $grant_storage) {
Chris@0:     parent::__construct($entity_type);
Chris@0:     $this->grantStorage = $grant_storage;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public static function createInstance(ContainerInterface $container, EntityTypeInterface $entity_type) {
Chris@0:     return new static(
Chris@0:       $entity_type,
Chris@0:       $container->get('node.grant_storage')
Chris@0:     );
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function access(EntityInterface $entity, $operation, AccountInterface $account = NULL, $return_as_object = FALSE) {
Chris@0:     $account = $this->prepareUser($account);
Chris@0: 
Chris@0:     if ($account->hasPermission('bypass node access')) {
Chris@0:       $result = AccessResult::allowed()->cachePerPermissions();
Chris@0:       return $return_as_object ? $result : $result->isAllowed();
Chris@0:     }
Chris@0:     if (!$account->hasPermission('access content')) {
Chris@0:       $result = AccessResult::forbidden("The 'access content' permission is required.")->cachePerPermissions();
Chris@0:       return $return_as_object ? $result : $result->isAllowed();
Chris@0:     }
Chris@0:     $result = parent::access($entity, $operation, $account, TRUE)->cachePerPermissions();
Chris@0: 
Chris@0:     return $return_as_object ? $result : $result->isAllowed();
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function createAccess($entity_bundle = NULL, AccountInterface $account = NULL, array $context = [], $return_as_object = FALSE) {
Chris@0:     $account = $this->prepareUser($account);
Chris@0: 
Chris@0:     if ($account->hasPermission('bypass node access')) {
Chris@0:       $result = AccessResult::allowed()->cachePerPermissions();
Chris@0:       return $return_as_object ? $result : $result->isAllowed();
Chris@0:     }
Chris@0:     if (!$account->hasPermission('access content')) {
Chris@17:       $result = AccessResult::forbidden("The 'access content' permission is required.")->cachePerPermissions();
Chris@0:       return $return_as_object ? $result : $result->isAllowed();
Chris@0:     }
Chris@0: 
Chris@0:     $result = parent::createAccess($entity_bundle, $account, $context, TRUE)->cachePerPermissions();
Chris@0:     return $return_as_object ? $result : $result->isAllowed();
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   protected function checkAccess(EntityInterface $node, $operation, AccountInterface $account) {
Chris@0:     /** @var \Drupal\node\NodeInterface $node */
Chris@0: 
Chris@0:     // Fetch information from the node object if possible.
Chris@0:     $status = $node->isPublished();
Chris@0:     $uid = $node->getOwnerId();
Chris@0: 
Chris@0:     // Check if authors can view their own unpublished nodes.
Chris@0:     if ($operation === 'view' && !$status && $account->hasPermission('view own unpublished content') && $account->isAuthenticated() && $account->id() == $uid) {
Chris@0:       return AccessResult::allowed()->cachePerPermissions()->cachePerUser()->addCacheableDependency($node);
Chris@0:     }
Chris@0: 
Chris@0:     // Evaluate node grants.
Chris@0:     return $this->grantStorage->access($node, $operation, $account);
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   protected function checkCreateAccess(AccountInterface $account, array $context, $entity_bundle = NULL) {
Chris@0:     return AccessResult::allowedIf($account->hasPermission('create ' . $entity_bundle . ' content'))->cachePerPermissions();
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   protected function checkFieldAccess($operation, FieldDefinitionInterface $field_definition, AccountInterface $account, FieldItemListInterface $items = NULL) {
Chris@0:     // Only users with the administer nodes permission can edit administrative
Chris@0:     // fields.
Chris@0:     $administrative_fields = ['uid', 'status', 'created', 'promote', 'sticky'];
Chris@0:     if ($operation == 'edit' && in_array($field_definition->getName(), $administrative_fields, TRUE)) {
Chris@0:       return AccessResult::allowedIfHasPermission($account, 'administer nodes');
Chris@0:     }
Chris@0: 
Chris@0:     // No user can change read only fields.
Chris@0:     $read_only_fields = ['revision_timestamp', 'revision_uid'];
Chris@0:     if ($operation == 'edit' && in_array($field_definition->getName(), $read_only_fields, TRUE)) {
Chris@0:       return AccessResult::forbidden();
Chris@0:     }
Chris@0: 
Chris@0:     // Users have access to the revision_log field either if they have
Chris@0:     // administrative permissions or if the new revision option is enabled.
Chris@0:     if ($operation == 'edit' && $field_definition->getName() == 'revision_log') {
Chris@0:       if ($account->hasPermission('administer nodes')) {
Chris@0:         return AccessResult::allowed()->cachePerPermissions();
Chris@0:       }
Chris@0:       return AccessResult::allowedIf($items->getEntity()->type->entity->isNewRevision())->cachePerPermissions();
Chris@0:     }
Chris@0:     return parent::checkFieldAccess($operation, $field_definition, $account, $items);
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function acquireGrants(NodeInterface $node) {
Chris@0:     $grants = $this->moduleHandler->invokeAll('node_access_records', [$node]);
Chris@0:     // Let modules alter the grants.
Chris@0:     $this->moduleHandler->alter('node_access_records', $grants, $node);
Chris@0:     // If no grants are set and the node is published, then use the default grant.
Chris@0:     if (empty($grants) && $node->isPublished()) {
Chris@0:       $grants[] = ['realm' => 'all', 'gid' => 0, 'grant_view' => 1, 'grant_update' => 0, 'grant_delete' => 0];
Chris@0:     }
Chris@0:     return $grants;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function writeGrants(NodeInterface $node, $delete = TRUE) {
Chris@0:     $grants = $this->acquireGrants($node);
Chris@0:     $this->grantStorage->write($node, $grants, NULL, $delete);
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function writeDefaultGrant() {
Chris@0:     $this->grantStorage->writeDefault();
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function deleteGrants() {
Chris@0:     $this->grantStorage->delete();
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function countGrants() {
Chris@0:     return $this->grantStorage->count();
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function checkAllGrants(AccountInterface $account) {
Chris@0:     return $this->grantStorage->checkAll($account);
Chris@0:   }
Chris@0: 
Chris@0: }