nodejs微信开发获取token，ticket-1

 /* jshint -W079 */
 /* jshint -W020 */

 "use strict";
 var _ = require("lodash");
 var sha1 = require('sha1');
 var urlencode = require('urlencode');
 var request = require('request');
 var express = require('express');
 var router = express.Router();

 module.exports = function(app) {

   /* 微信中继接口 */
   router.get('/wechat/ticket', function (req, res) {
     var page = req.query.page;

     if (page && page.indexOf('from=singlemessage') > 0 && page.indexOf('&isappinstalled=0') < 0) {
       page = page + "&isappinstalled=0";
     }

     WeChatTicket.findOne({appid: appid}).exec(function (err, ticket) {
       if (_.isEmpty(ticket)) refreshTicket(appid, appsecret, page, null, res);
       else {
         var difference = parseInt(new Date().getTime() / 1000) - ticket.at;
         if (difference > 7100) refreshTicket(appid, appsecret, page, ticket, res);
         else {
           var json = ticket.toJSON();

           var timestamp = parseInt(new Date().getTime() / 1000);
           json.at = timestamp;
           json.signature = wechatSignature(ticket, page, timestamp);

           res.json({ticket: json});
         }
       }
     });
   });

 // 微信 access_token 接口
   router.get('/wechat/access_token', function (req, res) {
     getToken(appid, appsecret, function(token, error) {
       if(error) console.error(error);
       res.json(token);
     });
   });

   function getToken(appid, appsecret, cb) {
     WeChatAccessToken.findOne({appid: appid}, function (err, token) {
       if(token) {
         var difference = parseInt(new Date().getTime() / 1000) - token.at;
         if (difference > 7100) refreshToken(appid, appsecret, function(data, err) { cb(data, err); });
         else cb(token, null);
       } else refreshToken(appid, appsecret, function(data, err) { cb(data, err); });
     });
   }

   function refreshToken(appid, appsecret, cb) {
     var access_token_api = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET";
     var url = access_token_api.replace('APPID', appid).replace('APPSECRET', appsecret);

     // 参考请求： http://localhost:7000/wechat/ticket?appid=wx8160a61c2d53fb74&appsecret=aa2c953465334823e20090156527a957
     request.get(url, function (error, response, body) {
       if (body) {
         WeChatAccessToken.findOne({appid: appid}, function (err, token) {
           if (!token) token = new WeChatAccessToken();
           var data = JSON.parse(body);

           token.appid = appid;
           token.access_token = data.access_token;
           token.expires_in = data.expires_in;
           token.at = parseInt(new Date().getTime() / 1000);
           token.save(function (err) { cb(token, err); });
         });
       } else cb(null, error);
     });
   }

   function refreshTicket(appid, appsecret, page, ticket, res) {
     getToken(appid, appsecret, function (token, err) {
       if (err === null) {
         if (!_.isEmpty(token.access_token)) {
           // 获取 jsapi_ticket
           var ticket_url = 'https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=' + token.access_token + '&type=jsapi';

           request.get(ticket_url, function (error, response, body) {
             var t = ticket === null ? new WeChatTicket() : ticket;
             var data = JSON.parse(body);

             if(!data.ticket) res.json({error: response});
             else {
               t.appid = appid;
               t.ticket = data.ticket;
               t.noncestr = sha1(new Date());
               t.expires_in = data.expires_in;
               t.at = parseInt(new Date().getTime() / 1000);

               var timestamp = parseInt(new Date().getTime() / 1000);
               var signature = wechatSignature(t, page, timestamp);

               t.save(function (err) {
                 var json = t.toJSON();
                 json.at = timestamp;
                 json.signature = signature;
                 res.json({ticket: json, error: err});
               });
             }
           });
         } else res.json({error: err});
       } else res.json({error: err});
     });
   }

   /* 微信签名实现 */
   function wechatSignature(t, page, timestamp) {
     var string = "jsapi_ticket=" + t.ticket + "&noncestr=" + t.noncestr + "&timestamp=" + timestamp + "&url=" + page;
     return sha1(string);
   }

   /* 微信授权接口 */
   router.get('/wechat/userinfo', function(req, res) {
     var cb = req.query.cb;
     res.cookie(wechat_userinfo_callback_url, cb);
     var url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=" + appid + "&redirect_uri=http://m.moretao.com/wechat/userinfo/callback&response_type=code&scope=snsapi_userinfo#wechat_redirect";
     res.redirect(url);
   });

   router.get('/wechat/userinfo/callback', function(req, res) {
     var code = req.query.code;
     var url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=" + appid + "&secret=" + appsecret + "&code=" + code + "&grant_type=authorization_code";
     request.get(url, function(error, response, body) {
       var json = JSON.parse(body);

       var refresh_url = "https://api.weixin.qq.com/sns/oauth2/refresh_token?appid=" + appid + "&grant_type=refresh_token&refresh_token=" + json.refresh_token;

       request.get(refresh_url, function(error, response, refresh) {
         var json = JSON.parse(refresh);
         var info_url = "https://api.weixin.qq.com/sns/userinfo?access_token=" + json.access_token + "&openid=" + json.openid + "&lang=zh_CN";
         request.get(info_url, function(error, response, info) {
           var callback = req.cookies[wechat_userinfo_callback_url];
           var str = "?data=";
           if(callback && callback.indexOf('?') > -1) str = "&data=";
           var ret = callback + str + encodeURIComponent(info);
           res.redirect(ret);
         });
       });
     });
   });

   /* 微信静默授权接口 */
   router.get('/wechat/silent', function(req, res) {
     var cb = req.query.cb;
     res.cookie(wechat_silent_callback_url, cb);
     var url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=" + appid + "&redirect_uri=http://m.moretao.com/wechat/silent/callback&response_type=code&scope=snsapi_base#wechat_redirect";
     res.redirect(url);
   });

   router.get('/wechat/silent/callback', function(req, res) {
     var code = req.query.code;
     var url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=" + appid + "&secret=" + appsecret + "&code=" + code + "&grant_type=authorization_code";

     request.get(url, function(error, response, body) {
       var callback = req.cookies[wechat_silent_callback_url];
       var str = "?data=";
       if(callback.indexOf('?') > -1) str = "&data=";
       res.redirect(callback + str + body);
     });
   });

   return router;
 };