signature.js

var request = require('request'),
    //cache = require('memory-cache'),
    sha1 = require('sha1'),
    config = require('./wechatConfig');

    exports.sign = function (url, callback) {
      console.log("sign")
      var noncestr = config.noncestr,
      timestamp = Math.floor(Date.now()/1000), //精确到秒
      jsapi_ticket;
      //if(cache.get('ticket')){
      if (false) {
        // jsapi_ticket = cache.get('ticket');
        // console.log('1' + 'jsapi_ticket=' + jsapi_ticket + '&noncestr=' + noncestr + '&timestamp=' + timestamp + '&url=' + url);
        // callback({
        //     noncestr:noncestr,
        //     timestamp:timestamp,
        //     url:url,
        //     jsapi_ticket:jsapi_ticket,
        //     signature:sha1('jsapi_ticket=' + jsapi_ticket + '&noncestr=' + noncestr + '&timestamp=' + timestamp + '&url=' + url)
        // });
      } else{
        request(config.accessTokenUrl + '?grant_type=' + config.grant_type + '&appid=' + config.appid + '&secret=' + config.secret ,function(error, response, body){
          if (!error && response.statusCode == 200) {
            var tokenMap = JSON.parse(body);
            request(config.ticketUrl + '?access_token=' + tokenMap.access_token + '&type=jsapi', function(error, resp, json){
              if (!error && response.statusCode == 200) {
                var ticketMap = JSON.parse(json);
                //cache.put('ticket',ticketMap.ticket,config.cache_duration);  //加入缓存
                console.log('jsapi_ticket=' + ticketMap.ticket + '&noncestr=' + noncestr + '&timestamp=' + timestamp + '&url=' + url);
                callback({
                  noncestr:noncestr,
                  timestamp:timestamp,
                  url:url,
                  jsapi_ticket:ticketMap.ticket,
                  signature:sha1('jsapi_ticket=' + ticketMap.ticket + '&noncestr=' + noncestr + '&timestamp=' + timestamp + '&url=' + url)
                });
              }
            })
          } else {
            console.error("request error");
          }
        })
      }
    }