nodejs微信开发获取token，ticket-1

  1 /* jshint -W079 */
  2 /* jshint -W020 */
  3 
  4 "use strict";
  5 var _ = require("lodash");
  6 var sha1 = require(‘sha1‘);
  7 var urlencode = require(‘urlencode‘);
  8 var request = require(‘request‘);
  9 var express = require(‘express‘);
 10 var router = express.Router();
 11 
 12 module.exports = function(app) {
 13 
 14   /* 微信中继接口 */
 15   router.get(‘/wechat/ticket‘, function (req, res) {
 16     var page = req.query.page;
 17 
 18     if (page && page.indexOf(‘from=singlemessage‘) > 0 && page.indexOf(‘&isappinstalled=0‘) < 0) {
 19       page = page + "&isappinstalled=0";
 20     }
 21 
 22     WeChatTicket.findOne({appid: appid}).exec(function (err, ticket) {
 23       if (_.isEmpty(ticket)) refreshTicket(appid, appsecret, page, null, res);
 24       else {
 25         var difference = parseInt(new Date().getTime() / 1000) - ticket.at;
 26         if (difference > 7100) refreshTicket(appid, appsecret, page, ticket, res);
 27         else {
 28           var json = ticket.toJSON();
 29 
 30           var timestamp = parseInt(new Date().getTime() / 1000);
 31           json.at = timestamp;
 32           json.signature = wechatSignature(ticket, page, timestamp);
 33 
 34           res.json({ticket: json});
 35         }
 36       }
 37     });
 38   });
 39 
 40 // 微信 access_token 接口
 41   router.get(‘/wechat/access_token‘, function (req, res) {
 42     getToken(appid, appsecret, function(token, error) {
 43       if(error) console.error(error);
 44       res.json(token);
 45     });
 46   });
 47 
 48   function getToken(appid, appsecret, cb) {
 49     WeChatAccessToken.findOne({appid: appid}, function (err, token) {
 50       if(token) {
 51         var difference = parseInt(new Date().getTime() / 1000) - token.at;
 52         if (difference > 7100) refreshToken(appid, appsecret, function(data, err) { cb(data, err); });
 53         else cb(token, null);
 54       } else refreshToken(appid, appsecret, function(data, err) { cb(data, err); });
 55     });
 56   }
 57 
 58   function refreshToken(appid, appsecret, cb) {
 59     var access_token_api = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET";
 60     var url = access_token_api.replace(‘APPID‘, appid).replace(‘APPSECRET‘, appsecret);
 61 
 62     // 参考请求： http://localhost:7000/wechat/ticket?appid=wx8160a61c2d53fb74&appsecret=aa2c953465334823e20090156527a957
 63     request.get(url, function (error, response, body) {
 64       if (body) {
 65         WeChatAccessToken.findOne({appid: appid}, function (err, token) {
 66           if (!token) token = new WeChatAccessToken();
 67           var data = JSON.parse(body);
 68 
 69           token.appid = appid;
 70           token.access_token = data.access_token;
 71           token.expires_in = data.expires_in;
 72           token.at = parseInt(new Date().getTime() / 1000);
 73           token.save(function (err) { cb(token, err); });
 74         });
 75       } else cb(null, error);
 76     });
 77   }
 78 
 79   function refreshTicket(appid, appsecret, page, ticket, res) {
 80     getToken(appid, appsecret, function (token, err) {
 81       if (err === null) {
 82         if (!_.isEmpty(token.access_token)) {
 83           // 获取 jsapi_ticket
 84           var ticket_url = ‘https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=‘ + token.access_token + ‘&type=jsapi‘;
 85 
 86           request.get(ticket_url, function (error, response, body) {
 87             var t = ticket === null ? new WeChatTicket() : ticket;
 88             var data = JSON.parse(body);
 89 
 90             if(!data.ticket) res.json({error: response});
 91             else {
 92               t.appid = appid;
 93               t.ticket = data.ticket;
 94               t.noncestr = sha1(new Date());
 95               t.expires_in = data.expires_in;
 96               t.at = parseInt(new Date().getTime() / 1000);
 97 
 98               var timestamp = parseInt(new Date().getTime() / 1000);
 99               var signature = wechatSignature(t, page, timestamp);
100 
101               t.save(function (err) {
102                 var json = t.toJSON();
103                 json.at = timestamp;
104                 json.signature = signature;
105                 res.json({ticket: json, error: err});
106               });
107             }
108           });
109         } else res.json({error: err});
110       } else res.json({error: err});
111     });
112   }
113 
114   /* 微信签名实现 */
115   function wechatSignature(t, page, timestamp) {
116     var string = "jsapi_ticket=" + t.ticket + "&noncestr=" + t.noncestr + "&timestamp=" + timestamp + "&url=" + page;
117     return sha1(string);
118   }
119 
120   /* 微信授权接口 */
121   router.get(‘/wechat/userinfo‘, function(req, res) {
122     var cb = req.query.cb;
123     res.cookie(wechat_userinfo_callback_url, cb);
124     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";
125     res.redirect(url);
126   });
127 
128   router.get(‘/wechat/userinfo/callback‘, function(req, res) {
129     var code = req.query.code;
130     var url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=" + appid + "&secret=" + appsecret + "&code=" + code + "&grant_type=authorization_code";
131     request.get(url, function(error, response, body) {
132       var json = JSON.parse(body);
133 
134       var refresh_url = "https://api.weixin.qq.com/sns/oauth2/refresh_token?appid=" + appid + "&grant_type=refresh_token&refresh_token=" + json.refresh_token;
135 
136       request.get(refresh_url, function(error, response, refresh) {
137         var json = JSON.parse(refresh);
138         var info_url = "https://api.weixin.qq.com/sns/userinfo?access_token=" + json.access_token + "&openid=" + json.openid + "&lang=zh_CN";
139         request.get(info_url, function(error, response, info) {
140           var callback = req.cookies[wechat_userinfo_callback_url];
141           var str = "?data=";
142           if(callback && callback.indexOf(‘?‘) > -1) str = "&data=";
143           var ret = callback + str + encodeURIComponent(info);
144           res.redirect(ret);
145         });
146       });
147     });
148   });
149 
150   /* 微信静默授权接口 */
151   router.get(‘/wechat/silent‘, function(req, res) {
152     var cb = req.query.cb;
153     res.cookie(wechat_silent_callback_url, cb);
154     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";
155     res.redirect(url);
156   });
157 
158   router.get(‘/wechat/silent/callback‘, function(req, res) {
159     var code = req.query.code;
160     var url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=" + appid + "&secret=" + appsecret + "&code=" + code + "&grant_type=authorization_code";
161 
162     request.get(url, function(error, response, body) {
163       var callback = req.cookies[wechat_silent_callback_url];
164       var str = "?data=";
165       if(callback.indexOf(‘?‘) > -1) str = "&data=";
166       res.redirect(callback + str + body);
167     });
168   });
169 
170   return router;
171 };