add wechat token

+/**
+ * 微信分享签名
+ * Bi Kai <kai.bi@yoho.cn>
+ */
+'use strict';
+const wechatModel = require('../models/wechat');
+
+exports.shareToken = (req, res, next) => {
+    wechatModel.calcSignature({
+        url: req.query.url || 'http://www.yohoblk.com/'
+    }).then((result) => {
+        res.jsonp(result);
+    }).catch(next);
+};

+'use strict';
+
+/*
+ * 生成微信分享所需的签名
+ * bikai <kai.bi@yoho.cn>
+ * 2016.6.15
+ */
+const request = require('request-promise');
+const Promise = require('bluebird');
+const crypto = require('crypto');
+const logger = global.yoho.logger;
+const cache = global.yoho.cache;
+
+// 此处请勿使用有货公众号的 appId, 此处使用的是 女生志 的appId
+const appId = 'wxb52ec6a352f0b090';
+const secret = '9fe6bedb0b7f30986a168c7fc44f34c0';
+
+const sha1 = (str) => {
+    const generator = crypto.createHash('sha1');
+
+    generator.update(str);
+    return generator.digest('hex');
+};
+
+const accessTokenCacheKey = 'wechatShare:accessToken';
+const ticketCacheKey = 'wechatShare:ticket';
+
+// 微信 JS 接口签名校验工具 http://mp.weixin.qq.com/debug/cgi-bin/sandbox?t=jsapisign
+
+let _getAccessToken = Promise.coroutine(function* () {
+    let accessToken = yield cache.get(accessTokenCacheKey);
+
+    if (accessToken) {
+        return accessToken;
+    }
+
+    logger.info('get accessToken from wechat API');
+    return request({
+        url: 'https://api.weixin.qq.com/cgi-bin/token',
+        qs: {
+            grant_type: 'client_credential',
+            appid: appId,
+            secret: secret
+        },
+        json: true
+    }).then((res) => {
+
+        // accessToken 有效期 7200s，缓存 7100s
+        cache.set(accessTokenCacheKey, res.access_token, 7100).catch((err) => {
+            logger.error('set wechat accessToken cache error', JSON.stringify(err));
+        });
+        return res.access_token;
+    }).catch((err) => {
+        logger.error('get accessToken from wechat API error', JSON.stringify(err));
+    });
+});
+
+let _getTicket = Promise.coroutine(function* () {
+    let ticket = yield cache.get(ticketCacheKey);
+
+    if (ticket) {
+        return ticket;
+    }
+
+    logger.info('get ticket from wechat API');
+    return request({
+        url: 'https://api.weixin.qq.com/cgi-bin/ticket/getticket',
+        qs: {
+            access_token: yield _getAccessToken(),
+            type: 'jsapi'
+        },
+        json: true
+    }).then(res => {
+
+            // ticket 有效期 7200s，缓存 7100s
+        cache.set(ticketCacheKey, res.ticket, 7100).catch((err) => {
+            logger.error('set wechat Token cache error', JSON.stringify(err));
+        });
+        return res.ticket;
+    }).catch((err) => {
+        logger.error('get ticket from wechat API error', JSON.stringify(err));
+    });
+});
+
+let calcSignature = Promise.coroutine(function* (data) {
+    data = Object.assign({
+        nonceStr: Math.random().toString(36).substr(2, 15),
+        timestamp: Math.floor(Date.now() / 1000) + '',
+        ticket: yield _getTicket(),
+        appId: appId
+    }, data);
+
+    const str = `jsapi_ticket=${data.ticket}&noncestr=${data.nonceStr}&timestamp=${data.timestamp}&url=${data.url}`;
+
+    data.signature = sha1(str);
+    return data;
+});
+
+// 测试
+// calcSignature({
+//     url: 'http://www.yohobuy.com/'
+// }).then(console.log);
+
+module.exports = {
+    calcSignature
+};

@@ -11,8 +11,11 @@ const router = require('express').Router(); // eslint-disable-line
 var multipart = require('connect-multiparty');
 var multipartMiddleware = multipart();
 
-const uploadApi = require('./upload/upload.js');
+const uploadApi = require('./controllers/upload.js');
+const wechat = require('./controllers/wechat.js');
 
 router.post('/upload/image', multipartMiddleware, uploadApi.uploadImg);
 
+router.get('/wechat/share/token', wechat.shareToken);
+
 module.exports = router;