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<?php
namespace Common\Files\Response;
use Carbon\Carbon;
use Common\Files\FileEntry;
use Illuminate\Contracts\Filesystem\FileNotFoundException;
use Illuminate\Support\Collection;
use ZipStream\Option\Archive;
use ZipStream\ZipStream;
class DownloadFilesResponse
{
/**
* @var FileResponseFactory
*/
private $fileResponseFactory;
/**
* @param FileResponseFactory $fileResponseFactory
*/
public function __construct(FileResponseFactory $fileResponseFactory)
{
$this->fileResponseFactory = $fileResponseFactory;
}
/**
* @param Collection|FileEntry[] $entries
* @return mixed
*/
public function create($entries)
{
if ($entries->count() === 1 && $entries->first()->type !== 'folder') {
return $this->fileResponseFactory->create($entries->first(), 'attachment');
} else {
$this->streamZip($entries);
}
}
/**
* @param Collection $entries
* @return void
*/
private function streamZip(Collection $entries)
{
$options = new Archive();
$options->setSendHttpHeaders(true);
// downloading multiple files from s3 will error out without this
$options->setZeroHeader(true);
$timestamp = Carbon::now()->getTimestamp();
$zip = new ZipStream("download-$timestamp.zip", $options);
$this->fillZip($zip, $entries);
$zip->finish();
}
/**
* @param ZipStream $zip
* @param Collection $entries
*/
private function fillZip(ZipStream $zip, Collection $entries) {
$entries->each(function(FileEntry $entry) use($zip) {
if ($entry->type === 'folder') {
// this will load all children, nested at any level, so no need to do a recursive loop
$children = $entry->allChildren()->get();
$children->each(function(FileEntry $childEntry) use($zip, $entry, $children) {
$path = $this->transformPath($childEntry, $entry, $children);
if ($childEntry->type === 'folder') {
// add empty folder in case it has no children
$zip->addFile("$path/", '');
} else {
$this->addFileToZip($childEntry, $zip, $path);
}
});
} else {
$this->addFileToZip($entry, $zip);
}
});
}
/**
* @param FileEntry $entry
* @param ZipStream $zip
* @param string $path
*/
private function addFileToZip(FileEntry $entry, ZipStream $zip, $path = null)
{
if ( ! $path) {
$path = $entry->getNameWithExtension();
}
try {
$stream = $entry->getDisk()->readStream($entry->getStoragePath());
$zip->addFileFromStream($path, $stream);
} catch (FileNotFoundException $e) {
//
}
}
/**
* Replace entry IDs with names inside "path" property.
*
* @param FileEntry $entry
* @param FileEntry $parent
* @param Collection $folders
* @return string
*/
private function transformPath(FileEntry $entry, FileEntry $parent, Collection $folders)
{
if ( ! $entry->path) return $entry->getNameWithExtension();
// '56/55/54 => [56,55,54]
$path = array_filter(explode('/', $entry->path));
$path = array_map(function($id) {
return (int) $id;
}, $path);
//only generate path until specified parent and not root
$path = array_slice($path, array_search($parent->id, $path));
// last value will be id of the file itself, remove it
array_pop($path);
//map parent folder IDs to names
$path = array_map(function($id) use($folders) {
return $folders->find($id)->name;
}, $path);
return implode('/', $path) . '/' . $entry->getNameWithExtension();
}
}