feature(feature/couponSend): add check for 401 result.message

@@ -107,7 +107,7 @@ exports.couponSend = (req, res, next) => {
     }
 
     // 一个token只能领一次
-    const udid = req.cookies.udid || uid;
+    const udid = req.cookies.udid;
     const redisCacheKey = `af_couponSend-${udid}-${coupontype}-${token}`;
 
     cache.get(redisCacheKey).then(ret => {
@@ -117,7 +117,10 @@ exports.couponSend = (req, res, next) => {
                 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)
+                // TODO: add check for 500
+                if (result &&
+                    (result.code === 200 ||
+                    (result.code === 401 && result.message === '优惠券已经领取'))) { // 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;
@@ -133,7 +136,7 @@ exports.couponSend = (req, res, next) => {
                 res.jsonp(result);
             });
         } else {
-            // 已领或在领取中
+            // 已领
             res.jsonp({
                 code: 401,
                 message: '优惠券已经领取',