import * as url from ‘url‘
import * as express from ‘express‘
import wechat from ‘./wechat‘

let app = express()

app.get(‘/‘,function(req,res){
  console.log(req.url)
  wechat(req,res)
})
app.listen(80)

import * as url from ‘url‘
import * as http from ‘http‘
import * as crypto from ‘crypto‘

function wechat(req:Request,res:Response){  
  var query = url.parse(req.url,true).query;  
  var signature = query.signature;  
  var timestamp = query.timestamp;  
  var nonce = query.nonce;  
  var echostr = query.echostr;  
　　//"weixin"需要跟配置时保持一致
  if(check(timestamp,nonce,signature,"weixin")){  
      res.end(echostr);  
  }else{  
      res.end("It is not from weixin");  
  }  
};  

function check(timestamp:number,nonce:any,signature:any,token:any){  
  var currSign,tmp;  
  tmp = [token,timestamp,nonce].sort().join("");  
  currSign = crypto.createHash("sha1").update(tmp).digest("hex");  
  return (currSign === signature);    
};
export default wechat