Completely decouple client code from server module

lib/actions/os.coffee

@@ -2,14 +2,14 @@ _ = require('lodash')
 async = require('async')
 path = require('path')
 mkdirp = require('mkdirp')
-url = require('url')
+ProgressBar = require('progress')
 resin = require('../resin')
 connection = require('../connection/connection')
-ui = require('../ui')
 log = require('../log/log')
 permissions = require('../permissions/permissions')
 errors = require('../errors/errors')
 cache = require('../cache/cache')
+resin = require('../resin')
 
 exports.download = (params, options) ->
 	networkParams =
@@ -34,13 +34,22 @@ exports.download = (params, options) ->
 		(parameters, callback) ->
 			parameters.appId = params.id
 
-			query = url.format(query: parameters)
-			downloadUrl = url.resolve(resin.settings.get('urls.download'), query)
+			bar = null
+			received = 0
 
-			return callback(null, downloadUrl)
+			resin.models.os.download parameters, outputFile, callback, (state) ->
 
-		(downloadUrl, callback) ->
-			ui.patterns.downloadFile(downloadUrl, outputFile, callback)
+				# TODO: Allow quieting this progress bar
+				bar ?= new ProgressBar 'Downloading device OS [:bar] :percent :etas',
+					complete: '='
+					incomplete: ' '
+					width: 40
+					total: state.total
+
+				return if bar.complete or not state?
+
+				bar.tick(state.received - received)
+				received = state.received
 
 	], (error) ->
 		errors.handle(error) if error?

lib/resin/models/index.coffee

@@ -3,3 +3,4 @@ module.exports =
 	device: require('./device')
 	key: require('./key')
 	environmentVariables: require('./environment-variables')
+	os: require('./os')

lib/resin/models/os.coffee

@@ -0,0 +1,15 @@
+url = require('url')
+fs = require('fs')
+server = require('../server/server')
+settings = require('../settings')
+
+exports.download = (parameters, destination, callback, onProgress) ->
+	query = url.format(query: parameters)
+	downloadUrl = url.resolve(settings.get('urls.download'), query)
+
+	server.request
+		method: 'GET'
+		url: downloadUrl
+		pipe: fs.createWriteStream(destination)
+	, callback
+	, onProgress

lib/ui/patterns/patterns.coffee

@@ -18,27 +18,3 @@ exports.remove = (name, confirmAttribute, deleteFunction, outerCallback) ->
 			deleteFunction(callback)
 
 	], outerCallback)
-
-exports.downloadFile = (url, dest, callback) ->
-	bar = null
-	received = 0
-
-	resin.server.request
-		method: 'GET'
-		url: url
-		pipe: fs.createWriteStream(dest)
-	, (error) ->
-		return callback(error)
-	, (state) ->
-
-		# TODO: Allow quieting this progress bar
-		bar ?= new ProgressBar 'Downloading device OS [:bar] :percent :etas',
-			complete: '='
-			incomplete: ' '
-			width: 40
-			total: state.total
-
-		return if bar.complete or not state?
-
-		bar.tick(state.received - received)
-		received = state.received