hestiacp/web/download/backup/index.php

<?php
use function Hestiacp\quoteshellarg\quoteshellarg;

ob_start();
include($_SERVER['DOCUMENT_ROOT']."/inc/main.php");

// Check token
verify_csrf($_GET);

$backup = $_GET['backup'];

if (!file_exists('/backup/'.$backup)) {
    $backup = quoteshellarg($_GET['backup']);
    exec(HESTIA_CMD."v-schedule-user-backup-download ".$user." ".$backup, $output, $return_var);
    if ($return_var == 0) {
        $_SESSION['error_msg'] = _('BACKUP_DOWNLOAD_SCHEDULED');
    } else {
        $_SESSION['error_msg'] = implode('<br>', $output);
        if (empty($_SESSION['error_msg'])) {
            $_SESSION['error_msg'] = _('Error: Hestia did not return any output.');
        }
    }
    unset($output);
    header("Location: /list/backup/");
    exit;
} else {
    if ($_SESSION['userContext'] === 'admin') {
        header('Content-type: application/gzip');
        header("Content-Disposition: attachment; filename=\"".$backup."\";");
        header("X-Accel-Redirect: /backup/" . $backup);
    }

    if ((!empty($_SESSION['user'])) && ($_SESSION['userContext'] != 'admin')) {
        if (strpos($backup, $_SESSION['user'].'.') === 0) {
            header('Content-type: application/gzip');
            header("Content-Disposition: attachment; filename=\"".$backup."\";");
            header("X-Accel-Redirect: /backup/" . $backup);
        }
    }
}