nextcloud/apps/files/ajax/download.php

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<?php
/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
*
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* @author Andreas Fischer <bantu@owncloud.com>
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* @author Björn Schießle <bjoern@schiessle.org>
* @author Christoph Wurst <christoph@winzerhof-wurst.at>
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* @author Frank Karlitschek <frank@karlitschek.de>
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* @author Jörn Friedrich Dreyer <jfd@butonic.de>
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* @author Lukas Reschke <lukas@statuscode.ch>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Piotr Filiciak <piotr@filiciak.pl>
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* @author Robin Appelman <robin@icewind.nl>
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*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
*/
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// Check if we are a user
OC_Util::checkLoggedIn();
\OC::$server->getSession()->close();
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$files = isset($_GET['files']) ? (string)$_GET['files'] : '';
$dir = isset($_GET['dir']) ? (string)$_GET['dir'] : '';
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$files_list = json_decode($files);
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// in case we get only a single file
if (!is_array($files_list)) {
$files_list = [$files];
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}
/**
* @psalm-taint-escape cookie
*/
function cleanCookieInput(string $value): string {
if (strlen($value) > 32) {
return '';
}
if (preg_match('!^[a-zA-Z0-9]+$!', $_GET['downloadStartSecret']) !== 1) {
return '';
}
return $value;
}
/**
* this sets a cookie to be able to recognize the start of the download
* the content must not be longer than 32 characters and must only contain
* alphanumeric characters
*/
if (isset($_GET['downloadStartSecret'])) {
$value = cleanCookieInput($_GET['downloadStartSecret']);
if ($value !== '') {
setcookie('ocDownloadStarted', $value, time() + 20, '/');
}
}
$server_params = [ 'head' => \OC::$server->getRequest()->getMethod() === 'HEAD' ];
/**
* Http range requests support
*/
if (isset($_SERVER['HTTP_RANGE'])) {
$server_params['range'] = \OC::$server->getRequest()->getHeader('Range');
}
OC_Files::get($dir, $files_list, $server_params);