StorageController::processActionDownload

protected function processActionDownload()
{
	$this->checkRequiredPostParams(array('id', 'version', 'extra', 'storageExtra', 'storageId'));
	if($this->errorCollection->hasErrors())
	{
		$this->sendJsonErrorResponse();
	}

	$id = $this->request->getPost('id');
	$version = $this->request->getPost('version');

	$storage = $this->getStorageObject($this->request->getPost('storageExtra'), $this->request->getPost('storageId'));
	$extra = $storage->parseElementExtra($this->request->getPost('extra'));

	$file = $storage->getFile($id, $extra);
	//not found or we have new version
	if (!$file || !isset($file['version']))
	{
		$this->sendJsonResponse(array(
			'status' => static::STATUS_NOT_FOUND,
		));
	}
	elseif ($storage->compareVersion($file['version'], $version) != 0)
	{
		$this->sendJsonResponse([
			'status' => static::STATUS_NOT_FOUND,
			'file' => $file,
		]);
	}
	else
	{
		if(!$storage->sendFile($file))
		{
			$this->sendJsonResponse(array(
				'status' => static::STATUS_NOT_FOUND,
				'message' => 'Not found source file',
			));
		}
	}
}