微信access_token和jsapi_ticket的存储

var MongodbClient = require('mongodb').MongoClient;
var DB_CONN_STR = 'mongodb://binf:FashionBinfabc123@10.168.48.227:27017/binf';
var request = require('request');
var express = require('express');
var session = require('express-session');
var sha1 = require('sha1');
var config = {
    "AppID": "wx38e76585e4db25a4",
    "AppSecret": "f8f2074cbc63b8bb2bfffcd87865ba1e",
};

var wx = {
    // accessToken的获取和更新
    'getAccessToken': function getAccessToken(callback) {
        MongodbClient.connect(DB_CONN_STR, function(err, db) {
            // console.log("mongodb连接成功");
            var collection = db.collection('accessToken');
            collection.find().toArray(function(err, result) {
                if (err) {
                    console.log("Error:" + err);
                    return;
                }
                if (result.length != 0) {
                    // console.log('数据库存在token')
                    // console.log("accessToken:==" + result);
                    var time = result[0].expires_in - (new Date().getTime() - result[0].timestamp) / 1000
                        // var time = 30 - (new Date().getTime() - result[0].timestamp) / 1000;
                        // console.log('time=' + time);
                    if (time > 0) {
                        session.tokenDate = result[0];
                        callback();
                    } else {
                        console.log('数据库accessToken已过期');
                        wx.updateAccessToken(collection, result, callback);
                    }
                } else {
                    // console.log('数据库中没有token')
                    wx.requestAccessToken(collection, callback);
                }
            });
        });
    },
    'requestAccessToken': function requestAccessToken(collection, callback) {
        var obj = {
            "url": "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + config.AppID + "&secret=" + config.AppSecret,
            "json": true
        };
        request(obj, function(err, res, body) {
            console.log("url获取数据accesstoken：" + JSON.stringify(body));
            body = JSON.parse(body);
            body.timestamp = new Date().getTime();
            collection.insert(body, function(err, result) {
                if(err){
                    console.log("插入数据报错："+err)
                    return;
                }
                console.log("数据库token插入成功" + result);
                session.tokenDate = body;
                callback();
            });
        });
    },
    'updateAccessToken': function updateAccessToken(collection, data, callback) {
        var where = { "_id": data[0]._id };
        var obj = {
            "url": "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + config.AppID + "&secret=" + config.AppSecret,
            "json": true
        };
        request(obj, function(err, res, body) {
            body = JSON.parse(body);
            var updateStr = { $set: body };
            body.timestamp = new Date().getTime();
            body._id = where._id;
            console.log('url获取的accessToken:===' + JSON.stringify(body));
            collection.update(where, updateStr, function(err, result) {
                console.log("数据库accesstToken更新成功" + result);
                session.tokenDate = body;
                callback();
            });
        });
    },
    'getJsapiTicket': function getJsapiTicket(callback) {
        MongodbClient.connect(DB_CONN_STR, function(err, db) {
            var collection = db.collection('jsapiTicket');
            collection.find().toArray(function(err, result) {
                if (result.length != '') {
                    console.log('数据库中存在jsapiTicket'+JSON.stringify(result));
                    var time = result[0].expires_in - (new Date().getTime() - result[0].timestamp) / 1000;
                    // var time = 30 - (new Date().getTime() - result[0].timestamp) / 1000;
                    console.log("jsapi---time---==" + time);
                    if (time > 0) {
                        session.jsapiTicket = result[0];
                        callback();
                    } else {
                        console.log("jsapiTicket过期");
                        wx.updateJsapiTicket(collection, result, callback);
                    }
                } else {
                    console.log('数据库中不存在jsapiTicket');
                    wx.requestJsapiTicket(collection, callback);
                }
            });
        });
    },
    'requestJsapiTicket': function requestJsapiTicket(collection, callback) {
        wx.getAccessToken(function() {
            console.log("access_token:===" + session.tokenDate.access_token);
            var obj = {
                'url': 'https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=' + session.tokenDate.access_token + '&type=jsapi',
                'json': true
            };
            request(obj, function(err, res, body) {
                body = JSON.parse(body);
                body.timestamp = new Date().getTime();
                console.log("url获取jsticket:" + JSON.stringify(body));
                collection.insert(body, function(err, result) {
                    if(err){
                        console.log(err)
                    }
                    console.log("jsapiTicket插入数据库成功：" + result);
                    session.jsapiTicket = body;
                    callback();
                });
            });
        });
    },
    'updateJsapiTicket': function updateJsapiTicket(collection, data, callback) {
        wx.getAccessToken(function() {
            var where = { "_id": data[0]._id };
            // console.log(data[0]._id);
            console.log("获取jsapiTicket的access_token:===" + session.tokenDate.access_token);
            var obj = {
                "url": 'https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=' + session.tokenDate.access_token + '&type=jsapi',
                "json": true
            };
            request(obj, function(err, res, body) {
                body = JSON.parse(body);
                var updateStr = { $set: body };
                body.timestamp = new Date().getTime();
                // accessToken没过期获取的jsapiTicket是一样的
                console.log('url获取的jsapiTicket:===' + JSON.stringify(body));
                collection.update(where, updateStr, function(err, result) {
                    console.log("数据库jsapiTicket更新成功" + result);
                    session.jsapiTicket = body;
                    callback();
                });
            });
        });
    },
    'getSignature': function getSignature(requestUrl, res) {
        //requestUrl由前端传递
        wx.getJsapiTicket(function() {
            var timestamp = new Date().getTime(),
                jsapiTicket = session.jsapiTicket.ticket,
                noncestr = sha1(timestamp),
                url = requestUrl;
            console.log('timestamp=' + timestamp + 'jsapiticket=' + jsapiTicket + 'noncestr=' + noncestr + 'url=' + url);
            var signature = sha1('jsapi_ticket=' + jsapiTicket + '&noncestr=' + noncestr + '&timestamp=' + timestamp + '&url=' + url);
            console.log(signature);
            res.json({
                "appid": config.AppID,
                'timestamp': timestamp,
                "nonceStr": noncestr,
                "signature": signature
            });
        });
    }
};

module.exports = wx;