解析nodejs微信开发-2获取ticket

 1   function refreshTicket(appid, appsecret, page, ticket, res) {
 2     getToken(appid, appsecret, function (token, err) {
 3       if (err === null) {
 4         if (!_.isEmpty(token.access_token)) {
 5           // 获取 jsapi_ticket
 6           var ticket_url = ‘https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=‘ + token.access_token + ‘&type=jsapi‘;
 7 
 8           request.get(ticket_url, function (error, response, body) {
 9             var t = ticket === null ? new WeChatTicket() : ticket;
10             var data = JSON.parse(body);
11 
12             if(!data.ticket) res.json({error: response});
13             else {
14               t.appid = appid;
15               t.ticket = data.ticket;
16               t.noncestr = sha1(new Date());
17               t.expires_in = data.expires_in;
18               t.at = parseInt(new Date().getTime() / 1000);
19 
20               var timestamp = parseInt(new Date().getTime() / 1000);
21               var signature = wechatSignature(t, page, timestamp);
22 
23               t.save(function (err) {
24                 var json = t.toJSON();
25                 json.at = timestamp;
26                 json.signature = signature;
27                 res.json({ticket: json, error: err});
28               });
29             }
30           });
31         } else res.json({error: err});
32       } else res.json({error: err});
33     });
34   }
35 
36   /* 微信签名实现 */
37   function wechatSignature(t, page, timestamp) {
38     var string = "jsapi_ticket=" + t.ticket + "&noncestr=" + t.noncestr + "&timestamp=" + timestamp + "&url=" + page;
39     return sha1(string);
40   }