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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：
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
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