class Access

class Access extends FilterPluginBase {
    
    /**
     * {@inheritdoc}
     */
    public function adminSummary() {
    }
    
    /**
     * {@inheritdoc}
     */
    protected function operatorForm(&$form, FormStateInterface $form_state) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function canExpose() {
        return FALSE;
    }
    
    /**
     * See _node_access_where_sql() for a non-views query based implementation.
     */
    public function query() {
        $account = $this->view
            ->getUser();
        if (!$account->hasPermission('bypass node access')) {
            $table = $this->ensureMyTable();
            $grants = $this->query
                ->getConnection()
                ->condition('OR');
            foreach (node_access_grants('view', $account) as $realm => $gids) {
                foreach ($gids as $gid) {
                    $grants->condition($this->query
                        ->getConnection()
                        ->condition('AND')
                        ->condition($table . '.gid', $gid)
                        ->condition($table . '.realm', $realm));
                }
            }
            $this->query
                ->addWhere('AND', $grants);
            $this->query
                ->addWhere('AND', $table . '.grant_view', 1, '>=');
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCacheContexts() {
        $contexts = parent::getCacheContexts();
        $contexts[] = 'user.node_grants:view';
        return $contexts;
    }

}