基于Node.js+Express+编写一个微信订阅号聊天机器人

const express = require('express');
const router = express.Router();
const axios = require('axios');
router.get("/", function (req, res, next) {
    const token = "填写微信公众平台后台的token";
    //1.获取微信服务器Get请求的参数 signature、timestamp、nonce、echostr
    let signature = req.query.signature, //微信加密签名
        timestamp = req.query.timestamp, //时间戳
        nonce = req.query.nonce, //随机数
        echostr = req.query.echostr; //随机字符串
    //2.将token、timestamp、nonce三个参数进行字典序排序
    let array = [token, timestamp, nonce];
    array.sort();
    //3.将三个参数字符串拼接成一个字符串进行sha1加密
    let tempStr = array.join("");
    let shaObj = new jsSHA("SHA-1", "TEXT");
    shaObj.update(tempStr);
    let scyptoString = shaObj.getHash("HEX");
    //4.开发者获得加密后的字符串可与signature对比，标识该请求来源于微信
    if (signature === scyptoString) {
        console.log("验证成功");
        res.send(echostr);
    } else {
        console.log("验证失败");
        res.send("验证失败");
    }
});
// 响应用户发送来的消息
const xml2js = require('xml2js');
router.post('/', (req, res) => {
    let xml = ''
    req.on('data', (chunk) => {
        xml += chunk
    })
    req.on('end', () => {
        //将接受到的xml数据转化为json
        xml2js.parseString(xml, {explicitArray: false}, function (err, json) {
            const backTime = new Date().getTime();  //创建发送时间，整数
            if (json.xml.MsgType === 'event') {  //消息为事件类型
                if (json.xml.EventKey === 'clickEvent') {
                    res.send(getXml(json, backTime, '你戳我干啥...'))  //回复用户的消息
                }
            } else if (json.xml.MsgType === 'text') {  //消息为文字类型
                const key = "填写机器人APIKEY"
                const url = "http://api.tianapi.com/robot/index?key=" + key + "&question=" + encodeURI(json.xml.Content);
                axios.get(url)
                    .then(function (response) {
                        res.send(getXml(json, backTime, response.data.newslist[0].reply))  //回复用户的消息
                    });
            }
        });
    })

    function getXml(json, backTime, word) {
        return `<xml>
					<ToUserName><![CDATA[${json.xml.FromUserName}]]></ToUserName>
					<FromUserName><![CDATA[${json.xml.ToUserName}]]></FromUserName>
					<CreateTime>${backTime}</CreateTime>
					<MsgType><![CDATA[text]]></MsgType>
					<Content><![CDATA[${word}]]></Content>
				</xml>`;
    }
})
module.exports = router;