memories/lib/Controller/DownloadController.php

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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2022 Varun Patil <radialapps@gmail.com>
* @author Varun Patil <radialapps@gmail.com>
* @license AGPL-3.0-or-later
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
namespace OCA\Memories\Controller;
use bantu\IniGetWrapper\IniGetWrapper;
use OCP\AppFramework\Http;
use OCP\AppFramework\Http\JSONResponse;
use OCP\ISession;
use OCP\Security\ISecureRandom;
class DownloadController extends ApiBase
{
/**
* @NoAdminRequired
*
* @PublicPage
*
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* @UseSession
*
* Request to download one or more files
*/
public function request(): JSONResponse
{
// Get ids from body
$files = $this->request->getParam('files');
if (null === $files || !\is_array($files)) {
return new JSONResponse([], Http::STATUS_BAD_REQUEST);
}
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// Return id
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$handle = self::createHandle('memories', $files);
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return new JSONResponse(['handle' => $handle]);
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}
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/**
* Get a handle for downloading files.
*
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* The calling controller must have the UseSession annotation.
*
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* @param string $name Name of zip file
* @param int[] $files
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*/
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public static function createHandle(string $name, array $files): string
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{
$handle = \OC::$server->get(ISecureRandom::class)->generate(16, ISecureRandom::CHAR_ALPHANUMERIC);
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\OC::$server->get(ISession::class)->set("memories_download_{$handle}", [$name, $files]);
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return $handle;
}
/**
* @NoAdminRequired
*
* @NoCSRFRequired
*
* @PublicPage
*
* Download one or more files
*/
public function file(string $handle): Http\Response
{
// Get ids from request
$session = \OC::$server->get(ISession::class);
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$key = "memories_download_{$handle}";
$info = $session->get($key);
$session->remove($key);
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if (null === $info) {
return new JSONResponse([], Http::STATUS_NOT_FOUND);
}
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$name = $info[0].'-'.date('YmdHis');
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$fileIds = $info[1];
/** @var int[] $fileIds */
$fileIds = array_filter(array_map('intval', $fileIds), function (int $id): bool {
return $id > 0;
});
// Check if we have any valid ids
if (0 === \count($fileIds)) {
return new JSONResponse([], Http::STATUS_NOT_FOUND);
}
// Download single file
if (1 === \count($fileIds)) {
return $this->one($fileIds[0]);
}
// Download multiple files
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$this->multiple($name, $fileIds); // exits
}
/**
* @NoAdminRequired
*
* @NoCSRFRequired
*
* @PublicPage
*/
public function one(int $fileid): Http\Response
{
$file = $this->getUserFile($fileid);
if (null === $file) {
return new JSONResponse([], Http::STATUS_NOT_FOUND);
}
// Get DAV location of file
$userFolder = $this->rootFolder->getUserFolder($file->getOwner()->getUID());
$path = $userFolder->getRelativePath($file->getPath());
// Setup filesystem for owner
\OC_Util::tearDownFS();
\OC_Util::setupFS($file->getOwner()->getUID());
// HEAD and RANGE support
$server_params = ['head' => 'HEAD' === $this->request->getMethod()];
if (isset($_SERVER['HTTP_RANGE'])) {
$server_params['range'] = $this->request->getHeader('Range');
}
// Write file to output and exit
\OC_Files::get(\dirname($path), basename($path), $server_params);
exit;
}
/**
* Download multiple files.
*
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* @param string $name Name of zip file
* @param int[] $fileIds
*/
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private function multiple(string $name, array &$fileIds)
{
// Disable time limit
$executionTime = (int) \OC::$server->get(IniGetWrapper::class)->getNumeric('max_execution_time');
@set_time_limit(0);
// Ensure we can abort the request if user stops it
ignore_user_abort(true);
// Pretend the size is huge so forced zip64
// Lookup the constructor of \OC\Streamer for more info
$size = \count($fileIds) * 1024 * 1024 * 1024 * 8;
$streamer = new \OC\Streamer($this->request, $size, \count($fileIds));
// Create a zip file
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$streamer->sendHeaders($name);
// Multiple files might have the same name
// So we need to add a number to the end of the name
$nameCounts = [];
// Send each file
foreach ($fileIds as $fileId) {
if (connection_aborted()) {
break;
}
/** @var bool|resource */
$handle = false;
/** @var ?File */
$file = null;
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/** @var ?string */
$name = (string) $fileId;
try {
// This checks permissions
$file = $this->getUserFile($fileId);
if (null === $file) {
throw new \Exception('File not found');
}
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$name = $file->getName();
// Open file
$handle = $file->fopen('rb');
if (false === $handle) {
throw new \Exception('Failed to open file');
}
// Handle duplicate names
if (isset($nameCounts[$name])) {
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++$nameCounts[$name];
// add count before extension
$extpos = strrpos($name, '.');
if (false === $extpos) {
$name .= " ({$nameCounts[$name]})";
} else {
$name = substr($name, 0, $extpos)." ({$nameCounts[$name]})".substr($name, $extpos);
}
} else {
$nameCounts[$name] = 0;
}
// Add file to zip
if (!$streamer->addFileFromStream(
$handle,
$name,
$file->getSize(),
$file->getMTime(),
)) {
throw new \Exception('Failed to add file to zip');
}
} catch (\Exception $e) {
// create a dummy memory file with the error message
$dummy = fopen('php://memory', 'rw+');
fwrite($dummy, $e->getMessage());
rewind($dummy);
$streamer->addFileFromStream(
$dummy,
"{$name}_error.txt",
\strlen($e->getMessage()),
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time(),
);
// close the dummy file
fclose($dummy);
} finally {
if (false !== $handle) {
fclose($handle);
}
}
}
// Restore time limit
@set_time_limit($executionTime);
// Done
$streamer->finalize();
exit;
}
}