Implement APK uploads using the new storage system. Installation from URL still does not work, and dropping the file on the screen may not work either.

lib/util/download.js

@@ -0,0 +1,67 @@
+var fs = require('fs')
+
+var Promise = require('bluebird')
+var request = require('request')
+var progress = require('request-progress')
+var temp = require('temp')
+
+module.exports = function download(url, options) {
+  var resolver = Promise.defer()
+  var path = temp.path(options)
+
+  function errorListener(err) {
+    resolver.reject(err)
+  }
+
+  function progressListener(state) {
+    if (state.total !== null) {
+      resolver.progress({
+        lengthComputable: true
+      , loaded: state.received
+      , total: state.total
+      })
+    }
+    else {
+      resolver.progress({
+        lengthComputable: false
+      , loaded: state.received
+      , total: state.received
+      })
+    }
+  }
+
+  function closeListener() {
+    resolver.resolve({
+      path: path
+    })
+  }
+
+  resolver.progress({
+    percent: 0
+  })
+
+  try {
+    var req = progress(request(url), {
+        throttle: 100 // Throttle events, not upload speed
+      })
+      .on('progress', progressListener)
+
+    resolver.promise.finally(function() {
+      req.removeListener('progress', progressListener)
+    })
+
+    var save = req.pipe(fs.createWriteStream(path))
+      .on('error', errorListener)
+      .on('close', closeListener)
+
+    resolver.promise.finally(function() {
+      save.removeListener('error', errorListener)
+      save.removeListener('close', closeListener)
+    })
+  }
+  catch (err) {
+    resolver.reject(err)
+  }
+
+  return resolver.promise
+}