Added redirection to Chinese servers based on location and language

package.json

@@ -48,6 +48,7 @@
     "connect": "2.7.x",
     "express": "~3.0.6",
     "express-useragent": "~0.0.9",
+    "geoip-lite": "^1.1.6",
     "graceful-fs": "~2.0.1",
     "gridfs-stream": "0.4.x",
     "jsondiffpatch": "0.1.17",

server_config.coffee

@@ -3,6 +3,7 @@ config = {}
 config.unittest = process.argv.indexOf('--unittest') > -1
 
 config.tokyo = process.env.TOKYO or false
+config.chinaDomain = "http://cn.codecombat.com"
 config.port = process.env.COCO_PORT or process.env.COCO_NODE_PORT or 3000
 config.ssl_port = process.env.COCO_SSL_PORT or process.env.COCO_SSL_NODE_PORT or 3443
 config.cloudflare =

server_setup.coffee

@@ -5,6 +5,7 @@ useragent = require 'express-useragent'
 fs = require 'graceful-fs'
 log = require 'winston'
 compressible = require 'compressible'
+geoip = require 'geoip-lite'
 
 database = require './server/commons/database'
 baseRoute = require './server/routes/base'
@@ -77,6 +78,25 @@ setupPassportMiddleware = (app) ->
   app.use(authentication.initialize())
   app.use(authentication.session())
 
+setupChinaRedirectMiddleware = (app) ->
+  isInChina = (req) ->
+    unless config.tokyo
+      ip = req.headers['x-forwarded-for'] || req.connection.remoteAddress
+      geo = geoip.lookup(ip)
+      if geo?.country isnt "CN" then return false
+      firstAcceptedLanguage = req.acceptedLanguages[0]
+      isChinese = firstAcceptedLanguage.indexOf? "zh"
+      return isChinese? and isChinese isnt -1
+    else
+      return true
+
+  app.use (req, res, next) ->
+    if isInChina req
+      res.writeHead 302, "Location": config.chinaDomain + req.url
+      res.end()
+    else
+      next()
+
 setupOneSecondDelayMiddleware = (app) ->
   if(config.slow_down)
     app.use((req, res, next) -> setTimeout((-> next()), 1000))
@@ -111,6 +131,7 @@ setupTrailingSlashRemovingMiddleware = (app) ->
     next()
 
 exports.setupMiddleware = (app) ->
+  setupChinaRedirectMiddleware app
   setupMiddlewareToSendOldBrowserWarningWhenPlayersViewLevelDirectly app
   setupExpressMiddleware app
   setupPassportMiddleware app