阿里云STS获取临时授权

    //获取阿里云oss授权
    public function sts(){
        $url = 'https://sts.aliyuncs.com';
        $action = 'AssumeRole';
        $RoleArn = 'rolearn';
        $RoleSessionName = 'client';
        $DurationSeconds = '1500';
        date_default_timezone_set("UTC");
        $param = array(
            'Format' => 'JSON',
            'Version' => '2015-04-01',
            'AccessKeyId' => 'AccessKeyId',
            'SignatureMethod' => 'HMAC-SHA1',
            'SignatureVersion' => '1.0',
            'SignatureNonce' => getRandChar(8),
            'Action' => $action,
            'RoleArn' => $RoleArn,
            'RoleSessionName' => $RoleSessionName,
            'DurationSeconds' => $DurationSeconds,
            'Timestamp' => date('Y-m-d').'T'.date('H:i:s').'Z'
        );
        foreach ($param as $k => $v) {
            $Parameters[$k] = $v;
        }
        $Parameters = $this->formatBizQueryParaMap($Parameters,true);
        //签名步骤一：按字典序排序参数
        $stringtosign = 'POST'."&".urlencode('/')."&".urlencode($Parameters);
        $key = 'AccessSecretId'.'&';
        $sign = hash_hmac('SHA1',$stringtosign,$key,true);
        $sign = base64_encode($sign);
        $param['Signature'] = $sign;
        $res = curl($url,true,$param);//curl post请求
        if($res){
            return $res;
        }else{
            return null;
        }
    }

    //将数组转成uri字符串
    function formatBizQueryParaMap($paraMap, $urlencode) {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v) {
            if ($urlencode) {
                $v = urlencode($v);
            }
            $buff.= ($k) . "=" . $v . "&";
        }
        $reqPar = '';
        if (strlen($buff) > 0) {
            $reqPar = substr($buff, 0, strlen($buff) - 1);
        }
        return $reqPar;
    }

/**
*@desc 封闭curl的调用接口
 * $url(网址），$ifpost(用post传值是需调为1)，$datafields(post的数据)
*/
function curl($url, $ifpost = 0, $datafields = '', $cookiefile = '', $v = false) { 
    $header = array("Connection: Keep-Alive","Accept: text/html, application/xhtml+xml, */*", "Pragma: no-cache", "Accept-Language: zh-Hans-CN,zh-Hans;q=0.8,en-US;q=0.5,en;q=0.3","User-Agent: Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)"); 
    $ch = curl_init(); 
    curl_setopt($ch, CURLOPT_URL, $url); 
    curl_setopt($ch, CURLOPT_HEADER, $v); 
    curl_setopt($ch, CURLOPT_HTTPHEADER, $header); 
    $ifpost && curl_setopt($ch, CURLOPT_POST, $ifpost); 
    $ifpost && curl_setopt($ch, CURLOPT_POSTFIELDS, $datafields); 
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); 
    curl_setopt($ch, CURLOPT_ENCODING, 'gzip,deflate'); 
    $cookiefile && curl_setopt($ch, CURLOPT_COOKIEFILE, $cookiefile); 
    $cookiefile && curl_setopt($ch, CURLOPT_COOKIEJAR, $cookiefile);
    curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
    curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,FALSE);
    $r = curl_exec($ch);
    curl_close($ch);
    return $r; 
}