public function MakeRequest($baseUrl, $mac)
{
$deadline = $this->Expires;
if ($deadline == 0) {
$deadline = 3600;
}
$deadline += time();
$pos = strpos($baseUrl, '?');
if ($pos !== false) {
$baseUrl .= '&e=';
} else {
$baseUrl .= '?e=';
}
$baseUrl .= $deadline;
$token = Qiniu_Sign($mac, $baseUrl);
return "{$baseUrl}&token={$token}";
}