implement barebones auto updater

config.js

@@ -1,12 +1,18 @@
 var applicationConfigPath = require('application-config-path')
 var path = require('path')
 
+var APP_VERSION = require('./package.json').version
+
 module.exports = {
   APP_COPYRIGHT: 'Copyright © 2014-2016 The WebTorrent Project',
   APP_FILE_ICON: path.join(__dirname, 'static', 'WebTorrentFile'),
   APP_ICON: path.join(__dirname, 'static', 'WebTorrent'),
   APP_NAME: 'WebTorrent',
 
+  AUTO_UPDATE_URL: 'https://webtorrent.io/app/updates?version=' + APP_VERSION,
+  AUTO_UPDATE_CHECK_STARTUP_DELAY: 60 * 1000 /* 1 minute */,
+  AUTO_UPDATE_CHECK_INTERVAL: 6 * 60 * 60 * 1000 /* 6 hours */,
+
   CONFIG_PATH: applicationConfigPath('WebTorrent'),
   CONFIG_POSTER_PATH: path.join(applicationConfigPath('WebTorrent'), 'Posters'),
   CONFIG_TORRENT_PATH: path.join(applicationConfigPath('WebTorrent'), 'Torrents'),

main/auto-updater.js

@@ -0,0 +1,41 @@
+module.exports = {
+  init
+}
+
+var electron = require('electron')
+
+var config = require('../config')
+
+// var app = electron.app
+var autoUpdater = electron.autoUpdater
+
+function init () {
+  autoUpdater.on('error', function (err) {
+    console.error('error downloading app update', err.message || err)
+  })
+
+  autoUpdater.setFeedURL(config.AUTO_UPDATE_URL)
+
+  // TODO: remove
+  autoUpdater.checkForUpdates()
+
+  /*
+   * We always check for updates on app startup. To keep app startup fast, we delay this
+   * first check so it happens when there is less going on.
+   */
+  setTimeout(() => autoUpdater.checkForUpdates(), config.AUTO_UPDATE_CHECK_STARTUP_DELAY)
+
+  /*
+   * After the first check for updates, we continually check for updates on a regular
+   * interval. This is to ensure that checks happen even when the app is left open for a
+   * long time.
+   */
+  setInterval(() => autoUpdater.checkForUpdates(), config.AUTO_UPDATE_CHECK_INTERVAL)
+
+  autoUpdater.on('checking-for-update', () => console.log('checking for app update'))
+  autoUpdater.on('update-available', () => console.log('app update available'))
+  autoUpdater.on('update-not-available', () => console.log('app update not available'))
+  autoUpdater.on('update-downloaded', function (e) {
+    console.log('app update downloaded', e)
+  })
+}

main/index.js

@@ -2,6 +2,7 @@ var electron = require('electron')
 
 var app = electron.app
 
+var autoUpdater = require('./auto-updater')
 var config = require('../config')
 var ipc = require('./ipc')
 var menu = require('./menu')
@@ -38,7 +39,10 @@ var argv = sliceArgv(process.argv)
 
 app.on('open-file', onOpen)
 app.on('open-url', onOpen)
-app.on('will-finish-launching', setupCrashReporter)
+app.on('will-finish-launching', function () {
+  autoUpdater.init()
+  setupCrashReporter()
+})
 
 app.ipcReady = false // main window has finished loading and IPC is ready
 app.isQuitting = false