nodejs后台实现微信现金红包

    最近公司需要做微信现金红包功能，于是本人根据微信文档（https://pay.weixin.qq.com/wiki/doc/api/tools/cash_coupon.php?chapter=13_4&index=3）进行了支付开发。但是其中发现微信文档有太多的坑导致我们根本没法快速实现，为了方便nodejs的小伙伴们快速上手我把我的代码和遇到的坑直接贴上。

  1.webpay.js //微信红包方法

/**

* Created by feng on 2018/08/17 /common/weixin.js

*/

/*拼接微信红包xml串 */

 

var config = require('./config');

var request = require('request');

var xml2js = require('xml2js');

// var xmlreader = require('xmlreader'); //需要安装 xmlreader包

var fs = require('fs');

var https = require('https');

var fnCreateXml = function(json){

var _xml = '';

for(var key in json) {

_xml+= '<'+key+'>'+json[key]+'';

}

return _xml;

}

/*

生成url串用于微信md5校验

*/

var fnCreateUrlParam = function(json){

var _str = '';

var _arr = []

for(var key in json){

_arr.push(key+'='+json[key]);

}

return _arr.join('&');

}

/*

生成微信红包数据

*/

var fnGetWeixinBonus = function(option){

// var min_value = req.body.min_value ||10, //红包最小金额

// var max_value = req.body.max_value || 10, //红包最大金额

var total_amount = option.total_amount || 10, //红包总金额

re_openid = option.re_openid || 'oWzhP0R68_eoMM6NvMzRWsx0uesk', //红包发送的目标用户

total_num = option.total_num || 1; //红包个数

var now = new Date();

var showName = config.server.showName;

var clientIp = config.server.clientIp;

var wishing = config.server.wishing;

var mch_id = config.server.mch_id;

var wxappid = config.server.wxappid,

wxkey = config.server.wxkey;

var date_time = now.getFullYear()+''+(now.getMonth()+1)+''+now.getDate();

var date_no = (now.getTime() +'').substr(-8); //生成8为日期数据，精确到毫秒

var random_no = Math.floor(Math.random()*99);

if(random_no < 10){ //生成位数为2的随机码

random_no = '0'+ random_no;

}

var muc_id = mch_id;

var xmlTemplate = '{content}';

var contentJson = {};

contentJson.act_name = showName;// '新年红包';

contentJson.client_ip = clientIp;

contentJson.mch_billno = muc_id + date_time+ date_no + random_no; //订单号为 mch_id + yyyymmdd+10位一天内不能重复的数字; //+201502041234567893';

contentJson.mch_id = muc_id;

//contentJson.logo_imgurl = '';

// contentJson.max_value = max_value;//'10';

// contentJson.min_value = min_value;// '10';

contentJson.nick_name = showName;

contentJson.nonce_str = Math.random().toString(36).substr(2, 15);

contentJson.re_openid = re_openid;// 'opVfe0v30XbCW7LE2j-7ruENJFS0'; // 'onqOjjmM1tad-3ROpncN-yUfa6uI';

contentJson.remark = wishing;

contentJson.send_name = showName;//

//contentJson.share_content = '';

//contentJson.share_share_url = '';

//contentJson.share_share_imageurl = '';

contentJson.total_amount = total_amount;// '10';

contentJson.total_num = total_num ;//1;

contentJson.wishing = wishing;//'恭喜发财';

contentJson.wxappid = wxappid;//商户appid

contentJson.key = wxkey;

var contentStr = fnCreateUrlParam(contentJson);

console.log('content='+ contentStr);

var crypto = require('crypto');

contentJson.sign = crypto.createHash('md5').update(contentStr, 'utf8').digest('hex').toUpperCase();

//删除 key (key不参与签名)

delete contentJson.key;

var xmlData = fnCreateXml(contentJson);

var sendData = ''+ xmlData +''; //_xmlTemplate.replace(/{content}/)

return sendData;

console.log('xml='+ sendData);

}

 

//得到token的方法

exports.getToken =function(req,res){

var APPID = config.server.wxappid;

var APPSECRET = config.server.appsecret;

var url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid="+APPID+"&secret="+APPSECRET+"";

request(

{

url : url,

method : 'GET',

body : ''

}, function (err, response, body){

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

console.log(body);

res.json({success:true,data: body});//返回客户端数据

}

else{

res.json({success:false});

}

});

}

 

//得到openid列表的方法

exports.getOpenList =function(req,res){

var access_token = req.params.access_token;

var url = "https://api.weixin.qq.com/cgi-bin/user/get?access_token="+access_token+"&next_openid=";

request(

{

url : url,

method : 'GET',

body : ''

}, function (err, response, body){

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

console.log(body);

res.json({success:true,data: body});//返回客户端数据

}

else{

res.json({success:false});

}

});

}

 

//得到个人openid信息的方法

exports.getUserInfo =function(req,res){

var access_token = req.params.access_token;

var openId = "oWzhP0R68_eoMM6NvMzRWsx0uesk";

var url = "https://api.weixin.qq.com/cgi-bin/user/info?access_token="+access_token+"&openid="+ openId +"&lang=zh_CN";

request(

{

url : url,

method : 'GET',

body : ''

}, function (err, response, body){

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

console.log(body);

res.json({success:true,data: body});//返回客户端数据

}

else{

res.json({success:false});

}

});

}

 

//微信现金红包

exports.fnSendMoney = function(req,res,callback){

var host = 'api.mch.weixin.qq.com';

var path = '/mmpaymkttransfers/sendredpack';

var total_amount = req.body.total_amount;

var total_num = 1;

var re_openid = req.body.re_openid;

var opt = {

host: host,

port:'443',

method:'POST',

path: path,

key: fs.readFileSync('./config/apiclient_key.pem'), //将微信生成的证书放入 cert目录下

cert: fs.readFileSync('./config/apiclient_cert.pem')

}

var body = '';

opt.agent = new https.Agent(opt);

var req = https.request(opt, function(res) {

console.log("Got response: " + res.statusCode);

res.on('data',function(d){

body += d;

}).on('end', function(){

//console.log(res.headers);

console.log('微信返回消息');

console.log(body);

var parser = new xml2js.Parser({ trim:true, explicitArray:false, explicitRoot:false });//解析签名结果xml转json

parser.parseString(body, function(err, result){

if(typeof callback == 'function'){

// + result['return_msg']+ result['result_code']

callback(result['return_code']+'|'+ result['return_msg']+'|'+ result['result_code']);

}

});

});

}).on('error', function(e) {

console.log("Got error: " + e.message);

});

var option = {total_amount,re_openid,total_num};

var sendData = fnGetWeixinBonus(option);

req.write(sendData);

req.end();

}

2.config.js 系统参数配置文件

'use strict';

module.exports = {

clientIp:"126.77.66.132",

showName:"天天科技",

wishing:"恭喜发财",

mch_id:"1511515151",

wxkey:"tiantiankeji8888", //key为在微信商户平台(pay.weixin.qq.com)-->账户设置-->API安全-->密钥设置

appid:"wxefcc9999999999",//微信支付app的appid

wxappid:"wx3a66666666666",//微信公众号appid

appsecret: "wx8888888888888"//公众号secret

};

 

3.app.js里调用方法：

//微信现金红包

let webpay = require('./modules/webpay');

 

// 微信现金红包

app.post('/webpay',webpay.fnSendMoney);

//得到访问token接口

app.get('/getToken',webpay.getToken);

//获取公众号下所有关注的openid信息接口

app.get('/getOpenList/:access_token',webpay.getOpenList);

//获取个人信息接口

app.get('/getUserInfo/:access_token',webpay.getUserInfo);