/** * Checks node revision access. * * @param \Drupal\node\NodeInterface $node * The node to check. * @param \Drupal\Core\Session\AccountInterface $account * A user object representing the user for whom the operation is to be * performed. * @param string $op * (optional) The specific operation being checked. Defaults to 'view.' * @param string|null $langcode * (optional) Language code for the variant of the node. Different language * variants might have different permissions associated. If NULL, the * original langcode of the node is used. Defaults to NULL. * * @return bool * TRUE if the operation may be performed, FALSE otherwise. */ public function checkAccess(NodeInterface $node, AccountInterface $account, $op = 'view', $langcode = NULL) { $map = array('view' => 'view all revisions', 'update' => 'revert all revisions', 'delete' => 'delete all revisions'); $bundle = $node->bundle(); $type_map = array('view' => "view {$bundle} revisions", 'update' => "revert {$bundle} revisions", 'delete' => "delete {$bundle} revisions"); if (!$node || !isset($map[$op]) || !isset($type_map[$op])) { // If there was no node to check against, or the $op was not one of the // supported ones, we return access denied. return FALSE; } // If no language code was provided, default to the node revision's langcode. if (empty($langcode)) { $langcode = $node->language()->getId(); } // Statically cache access by revision ID, language code, user account ID, // and operation. $cid = $node->getRevisionId() . ':' . $langcode . ':' . $account->id() . ':' . $op; if (!isset($this->access[$cid])) { // Perform basic permission checks first. if (!$account->hasPermission($map[$op]) && !$account->hasPermission($type_map[$op]) && !$account->hasPermission('administer nodes')) { $this->access[$cid] = FALSE; return FALSE; } // There should be at least two revisions. If the vid of the given node // and the vid of the default revision differ, then we already have two // different revisions so there is no need for a separate database check. // Also, if you try to revert to or delete the default revision, that's // not good. if ($node->isDefaultRevision() && ($this->nodeStorage->countDefaultLanguageRevisions($node) == 1 || $op == 'update' || $op == 'delete')) { $this->access[$cid] = FALSE; } elseif ($account->hasPermission('administer nodes')) { $this->access[$cid] = TRUE; } else { // First check the access to the default revision and finally, if the // node passed in is not the default revision then access to that, too. $this->access[$cid] = $this->nodeAccess->access($this->nodeStorage->load($node->id()), $op, $langcode, $account) && ($node->isDefaultRevision() || $this->nodeAccess->access($node, $op, $langcode, $account)); } } return $this->access[$cid]; }