Add HTTP API proxy.

lib/roles/device.js

@@ -1,11 +1,13 @@
 var assert = require('assert')
 var util = require('util')
+var http = require('http')
 
 var Promise = require('bluebird')
 var zmq = require('zmq')
 var adbkit = require('adbkit')
 var monkey = require('adbkit-monkey')
 var request = Promise.promisifyAll(require('request'))
+var httpProxy = require('http-proxy')
 
 var logger = require('../util/logger')
 var wire = require('../wire')
@@ -159,6 +161,8 @@ module.exports = function(options) {
             .then(function(conn) {
               conn.end()
               var ours = options.ports.pop()
+                , everyones = options.ports.pop()
+                , url = util.format('http://127.0.0.1:%d', ours)
               return adb.forwardAsync(
                   options.serial
                 , util.format('tcp:%d', ours)
@@ -166,10 +170,7 @@ module.exports = function(options) {
                 )
                 .then(function() {
                   return request.getAsync({
-                    url: util.format(
-                      'http://127.0.0.1:%d/api/v1/displays/0'
-                    , ours
-                    )
+                    url: util.format('%s/api/v1/displays/0', url)
                   , json: true
                   })
                 })
@@ -177,6 +178,40 @@ module.exports = function(options) {
                   assert.ok('id' in args[1], 'Invalid response from HTTP API')
                   identity.display = args[1]
                 })
+                .then(function() {
+                  var resolver = Promise.defer()
+
+                  var proxy = httpProxy.createProxyServer({
+                    target: url
+                  , ws: false
+                  , xfwd: false
+                  })
+
+                  var proxyServer = http.createServer(proxy.web)
+                    .listen(everyones)
+
+                  proxyServer.on('listening', resolver.resolve)
+                  proxyServer.on('error', resolver.reject)
+
+                  return resolver.promise.finally(function() {
+                    proxyServer.removeListener('listening', resolver.resolve)
+                    proxyServer.removeListener('error', resolver.reject)
+                    vitals.add('device:http:proxy', proxyServer)
+                  })
+                })
+                .then(function() {
+                  log.info(
+                    'HTTP API proxy running on "http://%s:%s"'
+                  , options.publicIp
+                  , everyones
+                  )
+
+                  identity.display.url = util.format(
+                    'http://%s:%s/api/v1/displays/0/screenshot.jpg'
+                  , options.publicIp
+                  , everyones
+                  )
+                })
             })
         })
     })