npm install express

npm install body-parser

npm install express-xml-bodyparser

npm install axios

var express = require('express');

var xmlparser = require('express-xml-bodyparser');

var crypto = require('crypto');

var path = require('path');

var bodyParser = require('body-parser');

var app = new express();

app.use(express.static(path.join(__dirname, 'public')));

app.use(bodyParser.json());

app.use(bodyParser.urlencoded({ extended: false }));

app.use(xmlparser());

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

    res.end('hello world');

})

//对接验证

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

    if (!req.query.signature) {

        res.end('hello,this is handle view');

        return;

    }

    const { signature, timestamp, nonce, echostr } = req.query;

    var token = "mydemo";

    var array = [token, timestamp, nonce];

    array.sort()

    var sha1 = crypto.createHash('sha1');

    var str = array.toString().replace(/,/g, '');

    var hashcode = sha1.update(str).digest('hex');

    if (hashcode == signature) {

        res.end(echostr);

    } else {

        res.end("");

    }

});


//实现你问我答 文本消息回复

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

    console.log(req.body);

    const { tousername, fromusername, createtime, msgtype, content } = req.body.xml;

    var xml = `<xml>

        <ToUserName><![CDATA[${fromusername}]]></ToUserName>'

        <FromUserName><![CDATA[${tousername}]]></FromUserName>'

        <CreateTime><![CDATA[${createtime}]]></CreateTime>'

        <MsgType><![CDATA[${msgtype}]]></MsgType>'

        <Content><![CDATA[${content}]]></Content>'

    </xml>`;

    res.end(xml);

});

app.listen(80, '0.0.0.0', () => {

    console.log('listen 80');

})