<?php
namespace common\pay\otczhifu;

class PayUtils
{


    /** 
     * @param array $data
     * @return string 
     */
    public static function makeSign($data, $key,$payurl)
    {
            $kye = $key;
            ksort($data);
            $paramsStrExceptSign = '';
            foreach ($data as $k => $val) {
                $paramsStrExceptSign .= $val;
            }
            $paramsStrExceptSign .= $key;
            $sign = md5($paramsStrExceptSign);//签名
            //初始化
            $curl = curl_init();
            //设置抓取的url
            curl_setopt($curl, CURLOPT_URL, $payurl);
            //设置头文件的信息作为数据流输出
            curl_setopt($curl, CURLOPT_HEADER, false);
            //设置获取的信息以文件流的形式返回，而不是直接输出。
            curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
            curl_setopt($curl, CURLOPT_HTTPHEADER, [
                'Sign:' . $sign
            ]);
            //设置post方式提交
            curl_setopt($curl, CURLOPT_POST, 1);
            //设置post数据
            $post_data = $data;
            curl_setopt($curl, CURLOPT_POSTFIELDS, $post_data);
            //执行命令
            $return_data = curl_exec($curl);
            //关闭URL请求
            curl_close($curl);
            $return_data = json_decode($return_data, true);

            $tt = print_r($return_data,true);
            file_put_contents('heheheh.txt',$tt);
            if ($return_data['code'] == 200) {   //成功
                return $return_data;    //返回登录地址
            } else {
                return  $return_data;
            }

    }

    //加密函数    
    public static function encrypt($data, $rsa_publickey)
    {
        $split = str_split($data, 117);  // 1024 bit && OPENSSL_PKCS1_PADDING  不大于117即可
        $crypto = '';
        foreach ($split as $chunk) {
            $isOkay = openssl_public_encrypt($chunk, $encryptData, $rsa_publickey);
            if (!$isOkay) {
                return false;
            }
            $crypto .= $encryptData;
        }
        return base64_encode($crypto);

    }

    //解密函数 
    public static function decrypt($data, $rsa_privatekey)
    {
        $split = str_split(base64_decode($data), 128);  // 1024 bit  固定172
        $crypto = '';
        foreach ($split as $chunk) {
            $isOkay = openssl_private_decrypt($chunk, $decryptData, $rsa_privatekey);  // base64在这里使用，因为172字节是一组，是encode来的
            if (!$isOkay) {
                return false;
            }
            $crypto .= $decryptData;
        }
        return $crypto;

    }


    //响应和验签函数
    public static function response($data,$rsa_private,$key)
    {
        //接受到响应  第一步解密
        $rsa_private = openssl_get_privatekey($rsa_private);                    //解密出私钥
        $data = json_decode(PayUtils::decrypt($data, $rsa_private), true);      //解密函数,得到数据

        ksort($data);
        $sign = $data['sign'];
        unset($data['sign']);
        $paramsStrExceptSign = '';
        foreach ($data as $k => $val) {
            $paramsStrExceptSign .= $k . $val;
        }
        $paramsStrExceptSign .= $key;                       //需要拼接上密钥

        if ($sign == md5($paramsStrExceptSign)) {           //验签成功
            
            return $data['paymentNo'];                      //返回解析数据中的订单号码   
        }else{

            return false;                 //验签不过就返回false

        }

    }


}