pics/controllers/Download.php

97 lines
2.4 KiB
PHP

<?php
/*****************************************************************************
* Download.php
* Contains the code to download an album.
*
* Kabuki CMS (C) 2013-2019, Aaron van Geffen
*****************************************************************************/
class Download
{
public function __construct()
{
// Ensure we're logged in at this point.
$user = Registry::get('user');
if (!$user->isLoggedIn())
throw new NotAllowedException();
if (!isset($_GET['tag']))
throw new UserFacingException('No album or tag has been specified for download.');
$tag = (int)$_GET['tag'];
$album = Tag::fromId($tag);
if (isset($_SESSION['current_export']))
throw new UserFacingException('An export of "' . $tag->tag . '" is ongoing. Please try again later.');
// So far so good?
$this->exportAlbum($album);
exit;
}
private function exportAlbum(Tag $album)
{
$files = [];
$album_ids = array_merge([$album->id_tag], $this->getChildAlbumIds($album->id_tag));
foreach($album_ids as $album_id)
{
$iterator = AssetIterator::getByOptions(['id_tag' => $album_id]);
while ($asset = $iterator->next())
$files[] = join(DIRECTORY_SEPARATOR, [$asset->getSubdir(), $asset->getFilename()]);
}
$descriptorspec = [
0 => ['pipe', 'r'],
1 => ['pipe', 'w'],
];
$command = 'tar -cf - -C ' . escapeshellarg(ASSETSDIR) . ' --null -T -';
$proc = proc_open($command, $descriptorspec, $pipes, ASSETSDIR);
if(!$proc)
throw new UnexpectedValueException('Could not execute TAR command');
if(!$pipes[0])
throw new UnexpectedValueException('Could not open pipe for STDIN');
if(!$pipes[1])
throw new UnexpectedValueException('Could not open pipe for STDOUT');
$album_name = $album->tag;
header('Pragma: no-cache');
header('Content-Description: File Download');
header('Content-disposition: attachment; filename="' . $album_name . '.tar"');
header('Content-Type: application/octet-stream');
header('Content-Transfer-Encoding: binary');
foreach($files as $file)
fwrite($pipes[0], $file . "\0");
fclose($pipes[0]);
while($chunk = stream_get_contents($pipes[1], 4096))
echo $chunk;
fclose($pipes[1]);
proc_close($proc);
}
private function getChildAlbumIds($parent_id)
{
$ids = [];
$albums = Tag::getAlbums($parent_id, 0, PHP_INT_MAX);
foreach ($albums as $album)
{
$ids[] = $album['id_tag'];
$ids = array_merge($ids, $this->getChildAlbumIds($album['id_tag']));
}
return $ids;
}
}