Download dmg automatically for darwin (#82)

* Try to show dmg

* Remove leftover isUpdate

lib/routes.js

@@ -1,3 +1,5 @@
+const querystring = require('querystring');
+
 // Packages
 const { send } = require('micro')
 const { valid, compare } = require('semver')
@@ -35,10 +37,15 @@ module.exports = ({ cache, config }) => {
 
   exports.download = async (req, res) => {
     const userAgent = parse(req.headers['user-agent'])
+    const queryParams = req.url.split('?')[1]
+    const params = queryParams ? querystring.parse(queryParams) : null
+    const isUpdate = params && params.update
     let platform
 
-    if (userAgent.isMac) {
+    if (userAgent.isMac && isUpdate) {
       platform = 'darwin'
+    } else if (userAgent.isMac && !isUpdate) {
+      platform = 'dmg'
     } else if (userAgent.isWindows) {
       platform = 'exe'
     }
@@ -145,7 +152,7 @@ module.exports = ({ cache, config }) => {
         notes,
         pub_date,
         url: shouldProxyPrivateDownload
-          ? `${url}/download/${platformName}`
+          ? `${url}/download/${platformName}?update=true`
           : latest.platforms[platform].url
       })
 
@@ -180,14 +187,6 @@ module.exports = ({ cache, config }) => {
   exports.overview = async (req, res) => {
     const latest = await loadCache()
 
-    // Filter out special platforms that should not
-    // be shown on the overview page
-    Object.keys(latest.platforms).forEach(platform => {
-      if (platform === 'dmg') {
-        delete latest.platforms[platform]
-      }
-    })
-
     try {
       const render = await prepareView()