chamilo-lms2/main/course_info/download.php

<?php
/* For licensing terms, see /license.txt */

use Chamilo\CourseBundle\Component\CourseCopy\CourseArchiver;

/**
 * Download script for course info
 * @package chamilo.course_info
 */

require_once __DIR__.'/../inc/global.inc.php';
$this_section = SECTION_COURSES;

if (isset($_GET['archive_path'])) {
	$archive_path = api_get_path(SYS_ARCHIVE_PATH);
} else {
	$archive_path = CourseArchiver::getBackupDir();
}
$archive_file = isset($_GET['archive']) ? $_GET['archive'] : null;
$archive_file = str_replace(array('..', '/', '\\'), '', $archive_file);

list($extension) = getextension($archive_file);

if (empty($extension) || !file_exists($archive_path.$archive_file)) {
    exit;
}

$extension = strtolower($extension);
$content_type = '';

if (in_array($extension, array('xml', 'csv')) && (api_is_platform_admin(true) || api_is_drh())) {
	$content_type = 'application/force-download';
} elseif ($extension === 'zip' && $_cid && (api_is_platform_admin(true) || $is_courseAdmin)) {
	$content_type = 'application/force-download';
}

if (empty($content_type)) {
    api_not_allowed(true);
}
if (Security::check_abs_path($archive_path.$archive_file, $archive_path)) {
    DocumentManager::file_send_for_download($archive_path.$archive_file, true, $archive_file);
    exit;
} else {
    api_not_allowed(true);
}