File::showAction

public function showAction($token)
{
	[$fileId] = self::extractToken($token);
	$file = null;

	if ($fileId)
	{
		$file = CFile::getFileArray($fileId);
	}

	if (!$file)
	{
		$this->addError(new Error('No file'));
		return null;
	}

	return BFile::createByFileData($file);
}