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Detailed explanation of nodejs implementation of WeChat payment function example

小云云Original: 2017-12-21 14:53:112536browse

The most important thing about using WeChat payment through nodejs is WeChat signature. The characters after md5 here must be converted to uppercase. This article mainly introduces the implementation of WeChat payment function based on nodejs in detail. It has certain reference value. If you are interested, Friends, you can refer to it, I hope it can help everyone.

1. Reply to WeChat notification message template

message.ejs

<xml> 
  <return_code><![CDATA[<%-return_code%>]]></return_code> 
  <return_msg><![CDATA[<%=return_msg%>]]></return_msg> 
</xml>

2. WeChat payment model file code

wxpay.js

var config = require(&#39;../config&#39;); ／／配置文件 appid 等信息 
var Q = require("q"); 
var request = require("request"); 
var crypto = require(&#39;crypto&#39;); 
var ejs = require(&#39;ejs&#39;); 
var fs = require(&#39;fs&#39;); 
var key = "此处为申请微信支付的API密码"; 
var messageTpl = fs.readFileSync(__dirname + &#39;/message.ejs&#39;, &#39;utf-8&#39;); 
 
var WxPay = { 
  getXMLNodeValue: function(node_name, xml) { 
    var tmp = xml.split("<" + node_name + ">"); 
    var _tmp = tmp[1].split("</" + node_name + ">"); 
    return _tmp[0]; 
  }, 
 
  raw: function(args) { 
    var keys = Object.keys(args); 
    keys = keys.sort() 
    var newArgs = {}; 
    keys.forEach(function(key) { 
      newArgs[key] = args[key]; 
    }); 
    var string = &#39;&#39;; 
    for (var k in newArgs) { 
      string += &#39;&&#39; + k + &#39;=&#39; + newArgs[k]; 
    } 
    string = string.substr(1); 
    return string; 
  }, 
 
  paysignjs: function(appid, nonceStr, package, signType, timeStamp) { 
    var ret = { 
      appId: appid, 
      nonceStr: nonceStr, 
      package: package, 
      signType: signType, 
      timeStamp: timeStamp 
    }; 
    var string = this.raw(ret); 
    string = string + &#39;&key=&#39; + key; 
    var sign = crypto.createHash(&#39;md5&#39;).update(string, &#39;utf8&#39;).digest(&#39;hex&#39;); 
    return sign.toUpperCase(); 
  }, 
 
  paysignjsapi: function(appid, attach, body, mch_id, nonce_str, notify_url, openid, out_trade_no, spbill_create_ip, total_fee, trade_type) { 
    var ret = { 
      appid: appid, 
      attach: attach, 
      body: body, 
      mch_id: mch_id, 
      nonce_str: nonce_str, 
      notify_url: notify_url, 
      openid: openid, 
      out_trade_no: out_trade_no, 
      spbill_create_ip: spbill_create_ip, 
      total_fee: total_fee, 
      trade_type: trade_type 
    }; 
    var string = this.raw(ret); 
    string = string + &#39;&key=&#39; + key; //key为在微信商户平台(pay.weixin.qq.com)-->账户设置-->API安全-->密钥设置 
    var crypto = require(&#39;crypto&#39;); 
    var sign = crypto.createHash(&#39;md5&#39;).update(string, &#39;utf8&#39;).digest(&#39;hex&#39;); 
    return sign.toUpperCase(); 
  }, 
 
  // 随机字符串产生函数 
  createNonceStr: function() { 
    return Math.random().toString(36).substr(2, 15); 
  }, 
 
  // 时间戳产生函数 
  createTimeStamp: function() { 
    return parseInt(new Date().getTime() / 1000) + &#39;&#39;; 
  },

// 此处的attach不能为空值 否则微信提示签名错误 
  order: function(attach, body, mch_id, openid, bookingNo, total_fee, notify_url) { 
    var deferred = Q.defer(); 
    var appid = config.member_config.appid; 
    var nonce_str = this.createNonceStr(); 
    var timeStamp = this.createTimeStamp(); 
    var url = "https://api.mch.weixin.qq.com/pay/unifiedorder"; 
    var formData = "<xml>"; 
    formData += "<appid>" + appid + "</appid>"; //appid 
    formData += "<attach>" + attach + "</attach>"; //附加数据 
    formData += "<body>" + body + "</body>"; 
    formData += "<mch_id>" + mch_id + "</mch_id>"; //商户号 
    formData += "<nonce_str>" + nonce_str + "</nonce_str>"; //随机字符串，不长于32位。 
    formData += "<notify_url>" + notify_url + "</notify_url>"; 
    formData += "<openid>" + openid + "</openid>"; 
    formData += "<out_trade_no>" + bookingNo + "</out_trade_no>"; 
    formData += "<spbill_create_ip>61.50.221.43</spbill_create_ip>"; 
    formData += "<total_fee>" + total_fee + "</total_fee>"; 
    formData += "<trade_type>JSAPI</trade_type>"; 
    formData += "<sign>" + this.paysignjsapi(appid, attach, body, mch_id, nonce_str, notify_url, openid, bookingNo, &#39;61.50.221.43&#39;, total_fee, &#39;JSAPI&#39;) + "</sign>"; 
    formData += "</xml>"; 
    var self = this; 
    request({ 
      url: url, 
      method: &#39;POST&#39;, 
      body: formData 
    }, function(err, response, body) { 
      if (!err && response.statusCode == 200) { 
        console.log(body); 
        var prepay_id = self.getXMLNodeValue(&#39;prepay_id&#39;, body.toString("utf-8")); 
        var tmp = prepay_id.split(&#39;[&#39;); 
        var tmp1 = tmp[2].split(&#39;]&#39;); 
        //签名 
        var _paySignjs = self.paysignjs(appid, nonce_str, &#39;prepay_id=&#39; + tmp1[0], &#39;MD5&#39;, timeStamp); 
        var args = { 
          appId: appid, 
          timeStamp: timeStamp, 
          nonceStr: nonce_str, 
          signType: "MD5", 
          package: tmp1[0], 
          paySign: _paySignjs 
        }; 
        deferred.resolve(args); 
      } else { 
        console.log(body); 
      } 
    }); 
    return deferred.promise; 
  }, 
 
  //支付回调通知 
  notify: function(obj) { 
    var output = ""; 
    if (obj.return_code == "SUCCESS") { 
      var reply = { 
        return_code: "SUCCESS", 
        return_msg: "OK" 
      }; 
 
    } else { 
      var reply = { 
        return_code: "FAIL", 
        return_msg: "FAIL" 
      }; 
    } 
 
    output = ejs.render(messageTpl, reply); 
    return output; 
  }, 
}; 
module.exports = WxPay;

3. Call wxpay in express router

//微信支付demo 
router.get(&#39;/order&#39;, function(req, res, next){ 
  var attach = "1276687601"; 
  var body = "测试支付"; 
  var mch_id = "1111111"; ／／商户ID 
  var openid = "111111"; 
  var bookingNo = "201501806125346"; ／／订单号 
  var total_fee = 10; 
  var notify_url = "http://localhost/wxpay/notify"; //通知地址 
  wxpay.order(attach, body, mch_id, openid, bookingNo, total_fee, notify_url).then(function(data){ 
    res.render(&#39;wxpay&#39;, {args: data}); 
  }); 
});

//微信回调通知 采用数据流形式读取微信返回的xml数据 此处不在累赘 
router.post(&#39;/notify&#39;, function(req, res, next){ 
 
});

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