110 lines
2.3 KiB
PHP
110 lines
2.3 KiB
PHP
<?php
|
|
/**
|
|
* @package solo
|
|
* @copyright Copyright (c)2014-2019 Nicholas K. Dionysopoulos / Akeeba Ltd
|
|
* @license GNU GPL version 3 or later
|
|
*/
|
|
|
|
namespace Solo\Model\Json\Task;
|
|
|
|
use Akeeba\Engine\Factory;
|
|
use Akeeba\Engine\Platform;
|
|
use Solo\Model\Json\TaskInterface;
|
|
|
|
/**
|
|
* Download a chunk of a backup archive over HTTP
|
|
*/
|
|
class Download implements TaskInterface
|
|
{
|
|
/**
|
|
* Return the JSON API task's name ("method" name). Remote clients will use it to call us.
|
|
*
|
|
* @return string
|
|
*/
|
|
public function getMethodName()
|
|
{
|
|
return 'download';
|
|
}
|
|
|
|
/**
|
|
* Execute the JSON API task
|
|
*
|
|
* @param array $parameters The parameters to this task
|
|
*
|
|
* @return mixed
|
|
*
|
|
* @throws \RuntimeException In case of an error
|
|
*/
|
|
public function execute(array $parameters = array())
|
|
{
|
|
// Get the passed configuration values
|
|
$defConfig = array(
|
|
'backup_id' => 0,
|
|
'part_id' => 1,
|
|
'segment' => 1,
|
|
'chunk_size' => 1
|
|
);
|
|
|
|
$defConfig = array_merge($defConfig, $parameters);
|
|
|
|
$backup_id = (int)$defConfig['backup_id'];
|
|
$part_id = (int)$defConfig['part_id'];
|
|
$segment = (int)$defConfig['segment'];
|
|
$chunk_size = (int)$defConfig['chunk_size'];
|
|
|
|
$backup_stats = Platform::getInstance()->get_statistics($backup_id);
|
|
|
|
if (empty($backup_stats))
|
|
{
|
|
// Backup record doesn't exist
|
|
throw new \RuntimeException('Invalid backup record identifier', 404);
|
|
}
|
|
|
|
$files = Factory::getStatistics()->get_all_filenames($backup_stats);
|
|
|
|
if ((count($files) < $part_id) || ($part_id <= 0))
|
|
{
|
|
// Invalid part
|
|
throw new \RuntimeException('Invalid backup part', 404);
|
|
}
|
|
|
|
$file = $files[ $part_id - 1 ];
|
|
|
|
$filesize = @filesize($file);
|
|
$seekPos = $chunk_size * 1048576 * ($segment - 1);
|
|
|
|
if ($seekPos > $filesize)
|
|
{
|
|
// Trying to seek past end of file
|
|
throw new \RuntimeException('Invalid segment', 404);
|
|
}
|
|
|
|
$fp = fopen($file, 'rb');
|
|
|
|
if ($fp === false)
|
|
{
|
|
// Could not read file
|
|
throw new \RuntimeException('Error reading backup archive', 500);
|
|
}
|
|
|
|
rewind($fp);
|
|
if (fseek($fp, $seekPos, SEEK_SET) === -1)
|
|
{
|
|
// Could not seek to position
|
|
throw new \RuntimeException('Error reading specified segment', 500);
|
|
}
|
|
|
|
$buffer = fread($fp, 1048576);
|
|
|
|
if ($buffer === false)
|
|
{
|
|
throw new \RuntimeException('Error reading specified segment', 500);
|
|
}
|
|
|
|
fclose($fp);
|
|
|
|
return base64_encode($buffer);
|
|
|
|
}
|
|
}
|