File::download

protected function download($id)
{
	/** @var DiskFile $file */
	$file = $this->get($id);

	$fileData = $file->getFile();
	if(!$fileData)
	{
		throw new RestException('Could not get content of file');
	}
	CFile::viewByUser($fileData, array('force_download' => true, 'cache_time' => 0, 'attachment_name' => $file->getName()));
}