node+express 微信支付

本文不谈框架，不谈代码组织结构，只谈怎么实现，

1,微信移动端支付流程如下：

这个流程可以微信app支付文档找到，最重要的就是统一下单这个接口，可以简化一下这个接口，简化后的流程如下:

app给后端传:金额total_fee,32位的商户订单号out_trade_no,支付成功后的回调地址notify_url 这最基本的3个参数，后端通过微信的统一下单接口https://api.mch.weixin.qq.com/pay/unifiedorder 生成一些参数，在返回给app端，app根据这些参数再加上微信授权，调起微信支付，支付成功后返回到商家app，微信后台自动检测是否支出成功，成功后调用app传给微信后端的回调地址notify_url接口，app后端在回调地址的接口中处理什么数据库改写操作，发消息等等的动作。

nodejs需要的一些包：

"dependencies": {

"crypto": "^1.0.1",

"express": "^4.16.3",

"request": "^2.85.0",

"xmlreader": "^0.2.3"

}

xmlreader处理xml的工具包,crypto数据加密包

2,工具类util.js

var xmlreader = require("xmlreader");

var fs = require("fs");

var wxpay = {

//把金额转为分

getmoney: function (money) {

return parseFloat(money) * 100;

// 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) + '';

//签名加密算法

paysignjsapi: function (appid, body, mch_id, nonce_str, notify_url, out_trade_no, spbill_create_ip, total_fee, trade_type, mchkey) {

var ret = {

appid: appid,

mch_id: mch_id,

nonce_str: nonce_str,

body: body,

notify_url: notify_url,

out_trade_no: out_trade_no,

spbill_create_ip: spbill_create_ip,

total_fee: total_fee,

trade_type: trade_type

};

console.log('ret==', ret);

var string = raw(ret);

var key = mchkey;

string = string + '&key=' + key;

console.log('string=', string);

var crypto = require('crypto');

return crypto.createHash('md5').update(string, 'utf8').digest('hex').toUpperCase();

//签名加密算法,第二次的签名

paysignjsapifinal: function (appid,mch_id,prepayid,noncestr,timestamp,mchkey) {

var ret = {

appid: appid,

partnerid: mch_id,

prepayid: prepayid,

package: 'Sign=WXPay',

noncestr: noncestr,

timestamp: timestamp,

};

console.log('retretret==', ret);

var string = raw(ret);

var key = mchkey;

string = string + '&key=' + key;

console.log('stringstringstring=', string);

var crypto = require('crypto');

return crypto.createHash('md5').update(string, 'utf8').digest('hex').toUpperCase();

getXMLNodeValue: function (xml) {

// var tmp = xml.split("<"+node_name+">");

// console.log('tmp',tmp);

// var _tmp = tmp[1].split("</"+node_name+">");

// console.log('_tmp',_tmp);

// return _tmp[0];

xmlreader.read(xml, function (errors, response) {

if (null !== errors) {

console.log(errors)

return;

}

console.log('长度===', response.xml.prepay_id.text().length);

var prepay_id = response.xml.prepay_id.text();

console.log('解析后的prepay_id==',prepay_id);

return prepay_id;

});

}

function raw(args) {

var keys = Object.keys(args);

keys = keys.sort()

var newArgs = {};

keys.forEach(function (key) {

newArgs[key] = args[key];

});

var string = '';

for (var k in newArgs) {

string += '&' + k + '=' + newArgs[k];

}

string = string.substr(1);

return string;

}

module.exports = wxpay;

3,调用app.js

appid,appsecret是微信开放平台的数据，mchid是微信对应的商户平台id,mchkey是商户平台陪的安全秘钥。

var express = require('express');

var request = require('request');

var xmlreader = require("xmlreader");

var fs = require("fs");

var app = express();

var wxpay = require('./util');

var appid = 'wx28f86efd25cc3312';

var appsecret = 'b8687555bf947b1947b62767c448723';

var mchid = '1499403456'

var mchkey = '8r435jVd7yA0354nsvkxb4cN3x7Se4322';

var wxurl = 'http://XXXXXXXXX/weixinNotify.action';

app.get('/',(req,res)=>{

//首先拿到前端传过来的参数

let orderCode = req.query.orderCode;

let money = req.query.money;

let orderID = req.query.orderID;

console.log('APP传过来的参数是',orderCode+'----'+money+'------'+orderID+'----'+appid+'-----'+appsecret+'-----'+mchid+'-----'+mchkey);

//首先生成签名sign

appid

let mch_id = mchid;

let nonce_str = wxpay.createNonceStr();

let timestamp = wxpay.createTimeStamp();

let body = '测试微信支付';

let out_trade_no = orderCode;

let total_fee = wxpay.getmoney(money);

let spbill_create_ip = req.connection.remoteAddress;

let notify_url = wxurl;

let trade_type = 'APP';

let sign = wxpay.paysignjsapi(appid,body,mch_id,nonce_str,notify_url,out_trade_no,spbill_create_ip,total_fee,trade_type,mchkey);

console.log('sign==',sign);

//组装xml数据

var formData = "<xml>";

formData += "<appid>"+appid+"</appid>"; //appid

formData += "<body><![CDATA["+"测试微信支付"+"]]></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 += "<out_trade_no>"+out_trade_no+"</out_trade_no>";

formData += "<spbill_create_ip>"+spbill_create_ip+"</spbill_create_ip>";

formData += "<total_fee>"+total_fee+"</total_fee>";

formData += "<trade_type>"+trade_type+"</trade_type>";

formData += "<sign>"+sign+"</sign>";

formData += "</xml>";

console.log('formData===',formData);

var url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';

request({url:url,method:'POST',body: formData},function(err,response,body){

if(!err && response.statusCode == 200){

console.log(body);

xmlreader.read(body.toString("utf-8"), function (errors, response) {

if (null !== errors) {

console.log(errors)

return;

}

console.log('长度===', response.xml.prepay_id.text().length);

var prepay_id = response.xml.prepay_id.text();

console.log('解析后的prepay_id==',prepay_id);

//将预支付订单和其他信息一起签名后返回给前端

let finalsign = wxpay.paysignjsapifinal(appid,mch_id,prepay_id,nonce_str,timestamp,mchkey);

res.json({'appId':appid,'partnerId':mchid,'prepayId':prepay_id,'nonceStr':nonce_str,'timeStamp':timestamp,'package':'Sign=WXPay','sign':finalsign});

});

}

});

})

app.listen(3000,()=>{

console.log('服务器启动了....');

});

https://blog.csdn.net/jasonzds/article/details/80067444

node+express 微信支付

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