php 微信退款,异步通知实现

快来打我* 2022-03-14 15:12 582阅读 0赞

**需要注意的事项：**

*  1.微信退款到零钱要求必传证书，需要到[https://pay.weixin.qq.com][https_pay.weixin.qq.com] 账户中心->账户设置->API安全->下载证书，然后**修改代码中的证书路径**
 *  2.该文件需放到支付授权目录下，可以在微信支付商户平台->产品中心->开发配置中设置。
 *  3.如提示签名错误可以通过微信支付签名验证工具进行验证：[https://pay.weixin.qq.com/wiki/tools/signverify/][https_pay.weixin.qq.com_wiki_tools_signverify]
 *  4 服务器也要授权这个证书路径的权限,不然没有权限会导致失败
 *  ## 代码如下: ##
 *  **向微信发起退款封装类**  
    **WxRefund.php**

class WxRefund
    {
        protected $SSLCERT_PATH;//证书路径
        protected $SSLKEY_PATH;//证书路径
        protected $key;//商户号
    
        function __construct($app_id, $mch_id, $key, $outRefundNo, $out_trade_no, $totalFee, $refundFee, $notify_url)
        {
            /*初始化退款类需要的变量*/
            $this->app_id       = $app_id;
            $this->mch_id       = $mch_id;//商户号
            $this->outRefundNo  = $outRefundNo;//自己订单后台升成的退款单号
            $this->out_trade_no = $out_trade_no;//商户系统内部订单号，要求32个字符内，只能是数字、大小写字母_-|*@ ，且在同一个商户号下唯一。
            $this->totalFee     = $totalFee * 100;//微信以一分为单位,系统以元为单位故乘以100,订单总金额
            $this->refundFee    = $refundFee * 100;//微信以一分为单位,系统以元为单位故乘以100,此次退款退的总金额
            $this->key          = $key;
            $this->notify_url   = $notify_url;
            $this->SSLCERT_PATH = '/home/tyuiyii89fdf5656565gpoeirdf_cert.pem';//证书在服务器中的绝对路径
            $this->SSLKEY_PATH  = '/home/zyiyuiuiuiuuiusaldl3489usoij54_key.pem';//证书在服务器中的绝对路径
        }
    
        public function refundStart()
        {
            //对外暴露的退款接口
            $result = $this->wxrefundapi();
            return $result;
        }
    
       private function wxrefundapi()
        {
            //通过微信api进行退款流程
            $parma         = array(
                'appid' => $this->app_id,
                'mch_id' => $this->mch_id,//商户号
                'nonce_str' => $this->createNoncestr(32),
                'out_refund_no' => $this->outRefundNo,
                'out_trade_no' => $this->out_trade_no,
                'total_fee' => $this->totalFee,
                'refund_fee' => $this->refundFee,
                'notify_url'=>$this->notify_url
            );
            $parma['sign'] = $this->getSign($parma);
            $xmldata   = $this->arrayToXml($parma);
            $xmlresult = $this->postXmlSSLCurl($xmldata, 'https://api.mch.weixin.qq.com/secapi/pay/refund');
            $result    = $this->xmlToArray($xmlresult);
            return $result;
        }
    
    //需要使用证书的请求
        function postXmlSSLCurl($xml, $url, $second = 30)
        {
            $ch = curl_init();
            //超时时间
            curl_setopt($ch, CURLOPT_TIMEOUT, $second);
            //这里设置代理，如果有的话
            //curl_setopt($ch,CURLOPT_PROXY, '8.8.8.8');
            //curl_setopt($ch,CURLOPT_PROXYPORT, 8080);
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
            curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
            //设置header
            curl_setopt($ch, CURLOPT_HEADER, FALSE);
            //要求结果为字符串且输出到屏幕上
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
            //设置证书
            //使用证书：cert 与 key 分别属于两个.pem文件
            //默认格式为PEM，可以注释
            curl_setopt($ch, CURLOPT_SSLCERTTYPE, 'PEM');
            curl_setopt($ch, CURLOPT_SSLCERT, $this->SSLCERT_PATH);
            //默认格式为PEM，可以注释
            curl_setopt($ch, CURLOPT_SSLKEYTYPE, 'PEM');
            curl_setopt($ch, CURLOPT_SSLKEY, $this->SSLKEY_PATH);
            //post提交方式
            curl_setopt($ch, CURLOPT_POST, true);
            curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
            $data = curl_exec($ch);
            //返回结果
            if ($data) {
                curl_close($ch);
                return $data;
            } else {
                $error = curl_errno($ch);
                echo "curl出错，错误码:$error" . "<br>";
                curl_close($ch);
                return false;
            }
        }
    
        //作用：产生随机字符串，不长于32位
        private function createNoncestr($length = 32)
        {
            $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
            $str   = "";
            for ($i = 0; $i < $length; $i++) {
                $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
            }
            return $str;
        }
    
        //作用：生成签名
        private function getSign($Obj)
        {
    
            foreach ($Obj as $k => $v) {
                $Parameters[$k] = $v;
            }
    
            //签名步骤一：按字典序排序参数
            ksort($Parameters);
            $String = $this->formatBizQueryParaMap($Parameters, false);
            //签名步骤二：在string后加入KEY
            $String = $String . "&key=" . $this->key;
            //签名步骤三：MD5加密
            $String = md5($String);
            //签名步骤四：所有字符转为大写
            $result_ = strtoupper($String);
            return $result_;
        }
    
        //数组转换成xml
        private function arrayToXml($arr)
        {
            $xml = "<xml>";
            foreach ($arr as $key => $val) {
                if (is_array($val)) {
                    $xml .= "<" . $key . ">" . arrayToXml($val) . "</" . $key . ">";
                } else {
                    $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
                }
            }
            $xml .= "</xml>";
            return $xml;
        }
    
        //xml转换成数组
        private function xmlToArray($xml)
        {
    
            //禁止引用外部xml实体
            libxml_disable_entity_loader(true);
    
            $xmlstring = simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA);
    
            $val = json_decode(json_encode($xmlstring), true);
    
            return $val;
        }
    
        // 作用：格式化参数，签名过程需要使用
        private 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;
        }
    }

*  ## 向微信发起退款示例 ##

$out_refund_no ='refund_'.uniqid() ;//退款单号,生成随机的64位字符串,不加特殊字符
            $appid         = 123468998989;
            $mch_id        = 6987656545556;
            $key           = uere758589656765665;
            $money_amount=100;//订单总金额,单位元
            $refundFee = 50;//退款的金额  单位元,退款金额必须小于等于订单总金额
            $out_trade_no ='refund_'.uniqid(); //商户系统内部订单号，要求32个字符内，只能是数字、大小写字母_-|*@ ，且在同一个商户号下唯一。
            /*$notify_url 微信退款异步通知的地址*/
            $notify_url = 'https://www.cctv.cn/refundNotifyByWx';
            $start         = new WxRefund($appid, $mch_id, $key, $out_refund_no, $out_trade_no,$money_amount, $refundFee);
            $result        = $start->refundStart();
            /*return_code 此字段是通信标识，表示接口层的请求结果，并非退款状态
            *result_code SUCCESS退款申请接收成功，结果通过退款查询接口查询 FAIL 提交业务失败
            */
            if (($result['return_code'] == 'SUCCESS') && ($result['result_code'] == 'SUCCESS')){
              echo '退款请求成功';
            }
            else{
            $reason = (empty($result['err_code_des'])) ? $result['return_msg'] : $result['err_code_des'];
            echo  '退款请求失败原因:'.$reson;
            }

另一篇参考文章:[https://www.cnblogs.com/lxwphp/p/9888604.html][https_www.cnblogs.com_lxwphp_p_9888604.html]

## 异步接收微信通知类封装和使用 ##

1.**异步通知接收类封装**  
**WxRefundNotify.php**

class WxRefundNotify
    {
        public $return_info;
        public  function __construct($str, $key) {
            $str=$this->xmltoArray($str);
            if($str['return_code']=='SUCCESS'){
                $key=strtolower(MD5($key));
                $decrypt = base64_decode($str['req_info'], true);
                $this->return_info=$this->xmlToArray(openssl_decrypt($decrypt , 'aes-256-ecb', $key, OPENSSL_RAW_DATA));
                $this->return_info['return_code']='SUCCESS';
            }else{
                $this->return_info=['return_code'=>'FAIL','return_msg'=>$str['return_msg']];
            }
        }
        public function decryptData(){
            return $this->return_info;
    
        }
        public function xmlToArray($xml)
        {
            libxml_disable_entity_loader(true);     // 禁止引用外部xml实体
            $jsonxml = json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA));
            $result = json_decode($jsonxml, true);
            return $result;
        }
    }

*异步通知类的坑:*  
网上参考的文章:[微信退款结果通知解密https://blog.csdn.net/tsummerb/article/details/78290554][https_blog.csdn.net_tsummerb_article_details_78290554]  
下面是网上的微信退款结果通知解密代码:

function refund_decrypt($str, $key) {
            $str = base64_decode($str);
            $str = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $str, MCRYPT_MODE_ECB);
            $block = mcrypt_get_block_size('rijndael_128', 'ecb');
            $pad = ord($str[($len = strlen($str)) - 1]);
            $len = strlen($str);
            $pad = ord($str[$len - 1]);
            return substr($str, 0, strlen($str) - $pad);
    }
    $str="微信同步的加密串req_info";
    $key=MD5('商户key');
    $data=refund_decrypt($str, $key);
    echo $data;

*  其中 mcrypt\_decrypt() 在php7.2的时候已经弃用了,会报错:  
    **Call to undefined function mcrypt\_decrypt()**  
    用 openssl\_decrypt()替换即可
 *  参考[PHP微信退款异步通知aes-256-ecb解密][PHP_aes-256-ecb]

2.**异步通知类的使用**

/*接收微信通知*/
           $post = input('post.');
            if ($post == null) {
                $post = file_get_contents("php://input");
            }
            if ($post == null) {
                $post = isset($GLOBALS['HTTP_RAW_POST_DATA']) ? $GLOBALS['HTTP_RAW_POST_DATA'] : '';
            }
            if (empty($post) || $post == null || $post == '') {
                //阻止微信接口反复回调接口  文档地址 https://pay.weixin.qq.com/wiki/doc/api/H5.php?chapter=9_7&index=7，下面这句非常重要!!!
                $str = '<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';
                echo $str;
                exit('Notify 非法回调');
            }
            $wx_config   = getConfig();
            /*$key 商户秘钥key*/
            $key         = $wx_config['key'];
            $weixin_data = new WxRefundNotify($post, $key);
            $result=$weixin_data->decryptData();
            //return_code此字段是通信标识，非交易标识，交易是否成功需要查看refund_status来判断
            if($result['return_code']=='SUCCESS'&&$result['refund_status']=='SUCCESS'){
                echo '退款成功';
                //退款成功之后的逻辑
            }else if($result['refund_status']=='CHANGE'){
                echo '退款异常';
            }else if($result['refund_status']=='REFUNDCLOSE'){
                echo '退款关闭';
            }

[https_pay.weixin.qq.com]: https://pay.weixin.qq.com
[https_pay.weixin.qq.com_wiki_tools_signverify]: https://pay.weixin.qq.com/wiki/tools/signverify/
[https_www.cnblogs.com_lxwphp_p_9888604.html]: https://www.cnblogs.com/lxwphp/p/9888604.html
[https_blog.csdn.net_tsummerb_article_details_78290554]: https://blog.csdn.net/tsummerb/article/details/78290554
[PHP_aes-256-ecb]: https://my.oschina.net/tanwen/blog/1549610