Update rewriter (#580)

src/server/rewriter.js

@@ -1,11 +1,6 @@
 const express = require('express')
-const url = require('url')
-const _ = require('lodash')
-function updateQueryString(target, sourceUrl) {
-  return ~sourceUrl.indexOf('?')
-    ? _.assign(target, url.parse(sourceUrl, true).query)
-    : {}
-}
+const rewrite = require('express-urlrewrite')
+
 module.exports = routes => {
   const router = express.Router()
 
@@ -13,26 +8,8 @@ module.exports = routes => {
     res.json(routes)
   })
 
-  Object.keys(routes).forEach(route => {
-    if (route.indexOf(':') !== -1) {
-      router.all(route, (req, res, next) => {
-        // Rewrite target url using params
-        let target = routes[route]
-        for (let param in req.params) {
-          target = target.replace(`:${param}`, req.params[param])
-        }
-        req.url = target
-        req.query = updateQueryString(req.query, req.url)
-        next()
-      })
-    } else {
-      router.all(`${route}*`, (req, res, next) => {
-        // Rewrite url by replacing prefix
-        req.url = req.url.replace(route, routes[route])
-        req.query = updateQueryString(req.query, req.url)
-        next()
-      })
-    }
+  Object.keys(routes).forEach(key => {
+    router.use(rewrite(key, routes[key]))
   })
 
   return router