feat(feature/couponSend): add request restriction to UDID

@@ -2,6 +2,7 @@
 const model = require('../models/feature');
 const _ = require('lodash');
 const stringProcess = require('../../../utils/string-process');
+const { cache, logger} = global.yoho;
 
 exports.index = function(req, res, next) {
     let qcdn = _.get(req.app.locals, 'wap.qcloud_cdn');
@@ -67,6 +68,7 @@ exports.bottombar = function(req, res, next) {
     }).catch(next);
 };
 
+const DefaultCouponExpireSeconds = 3600 * 24 * 7; // 7d
 
 /**
  * 获取优惠券
@@ -103,18 +105,46 @@ exports.couponSend = (req, res, next) => {
     if (uid === '' || uid === 0 || token === '' || token === 0) {
         return res.jsonp(resultData);
     }
-    const promise = coupontype === 'ufo' ?
-        req.ctx(model).couponSendUFO(uid, token) :
-        req.ctx(model).couponSend(uid, token);
 
-    promise.then(result => {
-        res.set({
-            'Cache-Control': 'no-cache',
-            Pragma: 'no-cache',
-            Expires: (new Date(1900, 0, 1, 0, 0, 0, 0)).toUTCString()
-        });
-        res.jsonp(result);
-    }).catch(next);
+    // 一个token只能领一次
+    const udid = req.cookies.udid || uid;
+    const redisCacheKey = `af_couponSend-${udid}-${coupontype}-${token}`;
+
+    cache.get(redisCacheKey).then(ret => {
+        if (ret === null) {
+            const promise = coupontype === 'ufo' ?
+                req.ctx(model).couponSendUFO(uid, token) :
+                req.ctx(model).couponSend(uid, token);
+
+            return promise.then(result => {
+                if (result && (result.code === 200 || result.code === 401)) { // 如果领取成功(200),或已经通过其它途经领取(401)
+                    return cache.set(redisCacheKey, Date.now(), DefaultCouponExpireSeconds)
+                        .then(() => {
+                            return result;
+                        });
+                }
+                return result;
+            }).then(result => {
+                res.set({
+                    'Cache-Control': 'no-cache',
+                    Pragma: 'no-cache',
+                    Expires: (new Date(1900, 0, 1, 0, 0, 0, 0)).toUTCString()
+                });
+                res.jsonp(result);
+            });
+        } else {
+            // 已领或在领取中
+            res.jsonp({
+                code: 401,
+                message: '优惠券已经领取',
+                data: ''
+            });
+        }
+    }).catch(err => {
+        logger.error('couponSend %s, %j', redisCacheKey, err);
+
+        next(err);
+    });
 };
 
 exports.redenvelope = (req, res, next) => {