DiskSecurityContext::canDoOperation

protected function canDoOperation($objectId, $operation)
{
	if ($this->userId === static::GUEST_USER)
	{
		return false;
	}

	if (!isset($this->operationsCache[$objectId]))
	{
		$this->operationsCache[$objectId] = $this->getOperationsByObject($objectId);
	}

	return isset($this->operationsCache[$objectId][$operation]);
}