Recently, I was thinking about the function of using node to connect to the payment function of the applet. I finally paid successfully after some bumps and bumps. The following is my code
//需要引入的包
var xml2js = require(‘xml2js‘);
var qs = require(‘querystring‘);
var https = require(‘https‘);
var http = require(‘http‘);
var request = require(‘request‘);
var crypto = require(‘crypto‘);
var mysql = require(‘mysql‘);main code
exports.pay = (req, res) => {
let time = new Date().getTime();
var total_fee,attach,openid,body,bookingNo;
let postData = req.body;
var apiUrl = "https://api.mch.weixin.qq.com/pay/unifiedorder";
total_fee = 100;
openid = postData.openid;
body = '商品详情-支付';
bookingNo=time;
var wxConfig = {
appid:'小程序APPID',
mch_id : '微信支付商户号'
};
var timeStamp = createTimeStamp(); //时间节点
var nonce_str = createNonceStr() + createTimeStamp(); //随机字符串
var create_ip = get_client_ip(req); //请求ip
var notify_url ='https://tqmsq.7dar.com/notifypay';
var formData = "<xml>";
formData += "<appid>"+wxConfig['appid']+"</appid>"; //appid
formData += "<mch_id>"+wxConfig['mch_id']+"</mch_id>"; //商户号
formData += "<nonce_str>"+nonce_str+"</nonce_str>"; //随机字符串
formData += "<body>" + body + "</body>"; //商品描述
formData += "<notify_url>"+notify_url+"</notify_url>";
formData += "<openid>" + openid + "</openid>";
formData += "<out_trade_no>" + bookingNo + "</out_trade_no>";
formData += "<spbill_create_ip>"+create_ip+"</spbill_create_ip>";
formData += "<total_fee>" + total_fee + "</total_fee>";
formData += "<trade_type>JSAPI</trade_type>";
formData += "<sign>" + paysignjsapi(wxConfig['appid'],body,wxConfig['mch_id'],nonce_str,notify_url,openid,bookingNo,create_ip,total_fee,'JSAPI') + "</sign>";
formData += "</xml>";
console.log(formData);
request({
url: apiUrl,
method: 'POST',
body: formData
},function (err, response, body) {
if (!err && response.statusCode === 200){
console.log('成功',body);
var result_code = getXMLNodeValue('result_code', body.toString("utf-8"));
var resultCode = result_code.split('[')[2].split(']')[0];
if(resultCode === 'SUCCESS'){ //成功
var prepay_id = getXMLNodeValue('prepay_id', body.toString("utf-8")).split('[')[2].split(']')[0]; //获取到prepay_id
console.log('prepay_id',prepay_id)
//签名
var _paySignjs = paysignjs(wxConfig['appid'], nonce_str, 'prepay_id='+ prepay_id,'MD5',timeStamp);
var args = {
appId: wxConfig['appid'],
timeStamp: timeStamp,
nonceStr: nonce_str,
signType: "MD5",
package: prepay_id,
paySign: _paySignjs,
status:200
};
return res.send({
status: 0,
message: '获取成功',
data: args
})
res.end();
}else{ //失败
var err_code_des = getXMLNodeValue('err_code_des',body.toString("utf-8"));
var errDes = err_code_des.split('[')[2].split(']')[0];
var errArg = {
status:400,
errMsg: errDes
};
res.write(JSON.stringify(errArg));
res.end();
}
console.log('prepay_id是'+resultCode)
}
})
}What needs to be noted above is that the user's openid must be obtained before payment can be made.
Some utility functions used
function paysignjs(appid, nonceStr, package, signType, timeStamp) {
var ret = {
appId: appid,
nonceStr: nonceStr,
package: package,
signType: signType,
timeStamp: timeStamp,
};
var string = raw1(ret);
string = string + '&key=支付商户号密钥';
console.log(string);
return crypto.createHash('md5').update(string, 'utf8').digest('hex');
}
function raw1(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;
}
//生成签名
function paysignjsapi(appid,body,mch_id,nonce_str,notify_url,openid,out_trade_no,spbill_create_ip,total_fee,trade_type) {
var ret = {
appid: appid,
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
};
console.log('ret',ret)
var string = raw(ret);
string = string + '&key=支付商户号密钥';
var sign = crypto.createHash('md5').update(string, 'utf8').digest('hex');
return sign.toUpperCase()
}
function raw(args) {
var keys = Object.keys(args);
keys = keys.sort();
var newArgs = {};
keys.forEach(function(key) {
newArgs[key.toLowerCase()] = args[key];
});
var string = '';
for(var k in newArgs) {
string += '&' + k + '=' + newArgs[k];
}
string = string.substr(1);
return string;
}
//解析xml
function getXMLNodeValue(node_name, xml) {
var tmp = xml.split("<" + node_name + ">");
var _tmp = tmp[1].split("</" + node_name + ">");
return _tmp[0];
}
//获取url请求客户端ip
var get_client_ip = function(req) {
var ip = req.headers['x-forwarded-for'] ||
req.ip ||
req.connection.remoteAddress ||
req.socket.remoteAddress ||
req.connection.socket.remoteAddress || '';
if(ip.split(',').length>0){
ip = ip.split(',')[0]
}
return ip;
};
// 随机字符串产生函数
function createNonceStr() {
return Math.random().toString(36).substr(2, 15)
}
// 时间戳产生函数
function createTimeStamp() {
return parseInt(new Date().getTime() / 1000) + ''
}The front end invokes the WeChat payment api after receiving the returned parameters
services.order.pay(data).then(res => {
wx.requestPayment({
timeStamp: res.data.timeStamp,
nonceStr: res.data.nonceStr,
package: 'prepay_id='+res.data.package,
signType: 'MD5',
paySign: res.data.paySign,
success(res) {
console.log(res)
},
fail(err) {
console.log(err);
}
})
})Please note that "prepay_id=" must be added to the package parameter here, otherwise the following error will be reported
I searched for this problem for two days before I found the reason. It turned out that I did not read the document development, and finally paid successfully~