DocumentController::prepareParams

protected function prepareParams()
{
	if($this->isActionWithExistsFile())
	{
		if(!$this->checkRequiredInputParams($_REQUEST, array('objectId')))
		{
			return false;
		}
		$this->fileId = (int)$_REQUEST['objectId'];
		if(!empty($_REQUEST['versionId']))
		{
			$this->versionId = (int)$_REQUEST['versionId'];
		}
	}

	return true;
}