//路由 wxapi.js:
const router = require('koa-router')()
let crypto = require('crypto');
const xml2js = require('xml2js');
router.prefix('/wxapi')
function xmlToJson (str) {
return new Promise((resolve, reject) => {
const parseString = xml2js.parseString;
parseString(str, (err, result) => {
if (err) {
reject(err)
} else {
resolve(result)
}
})
})
}
function jsonToXml (obj) {
const builder = new xml2js.Builder()
return builder.buildObject(obj)
}
router.all('/', async (ctx, next) => {
if(ctx.method=='GET'){
let echostr = ctx.query["echostr"];
let signature = ctx.query["signature"];
let timestamp = ctx.query["timestamp"];
let nonce = ctx.query["nonce"];
let token = 'Yossef'; //令牌名
/* 加密/校验流程如下： */
//1. 将token、timestamp、nonce三个参数进行字典序排序
let array = new Array(token,timestamp,nonce);
array.sort();
let str = array.toString().replace(/,/g,"");
//2. 将三个参数字符串拼接成一个字符串进行sha1加密
let sha1Code = crypto.createHash("sha1");
let code = sha1Code.update(str,'utf-8').digest("hex");
//3. 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(code===signature){
ctx.body=echostr; //登陆成功
}else{
ctx.body="error";
}
}else{
if(ctx.is('text/xml')){
let msgJson = await new Promise(function (resolve, reject) {
let buf = ''
ctx.req.setEncoding('utf8')
ctx.req.on('data', (chunk) => {
buf += chunk
})
ctx.req.on('end',async () => {
let json = await xmlToJson(buf);
resolve(json);
})
});
console.log(msgJson);
let myMsg = msgJson;
let FromUserName = msgJson.xml['ToUserName'];
let ToUserName = msgJson.xml['FromUserName'];
myMsg.xml['FromUserName'] = FromUserName;
myMsg.xml['ToUserName'] = ToUserName;
myMsg.xml['MsgType'] = 'text';
myMsg.xml['CreateTime'] = [new Date()];
delete myMsg.xml['MsgId'];
if(!(typeof(msgJson.xml['Event'])!='undefined'&&msgJson.xml['Event']=='subscribe')){
myMsg.xml['Content'] = ['你好'];
}else{
myMsg.xml['Content'] = ['欢迎来到结伴空间'];
}
let result = jsonToXml(myMsg);
ctx.body = result;
}
}
})
module.exports = router