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<?php /** * @package akeebabackup * @copyright Copyright 2006-2026 Nicholas K. Dionysopoulos / Akeeba Ltd * @license GNU General Public License version 3, or later */ namespace Akeeba\Component\AkeebaBackup\Site\Model\Json\Task; // Protect from unauthorized access defined('_JEXEC') || die(); use Akeeba\Engine\Factory; use Akeeba\Engine\Platform; use RuntimeException; /** * Download a chunk of a backup archive over HTTP */ class Download extends AbstractTask { /** * 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 = []) { // Get the passed configuration values $defConfig = [ '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 ((($files === null ? 0 : count($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, 'r'); 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); } }
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