make banner api more useful

router/banner.js

 const express = require("express");
 const router = express();
-const { createWebAPIRequest } = require("../util/util");
+const request = require("request");
 
 router.get("/", (req, res) => {
-  const cookie = req.get("Cookie") ? req.get("Cookie") : "";
-  const data = {
-    timeStamp: 0 + new Date(),
-    csrf_token: ""
+  const options = {
+    url: "http://music.163.com/discover",
+    method: "GET",
+    headers: {
+      Referer: "http://music.163.com",
+      "User-Agent":
+        "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3380.0 Safari/537.36"
+    }
   };
-  createWebAPIRequest(
-    "music.163.com",
-    "/api/v2/banner/get",
-    "POST",
-    data,
-    cookie,
-    music_req => {
-      res.send(music_req);
-    },
-    err => res.status(502).send("fetch error")
-  );
+  request(options, (error, response, body) => {
+    if (error) {
+      res.status(502).send("fetch error");
+    } else {
+      try {
+        const pattern = /<script[^>]*>\s*window\.Gbanners\s*=\s*([^;]+?);\s*<\/script>/g;
+        const banners = pattern.exec(body)[1];
+        res.send(JSON.stringify(eval(banners)));
+      } catch (error) {
+        res.status(502).send("fetch error");
+      }
+    }
+  });
 });
 
 module.exports = router;