merged with latest master; using icon as checkbox.

src/config.js

@@ -0,0 +1,126 @@
+var appConfig = require('application-config')('WebTorrent')
+var fs = require('fs')
+var path = require('path')
+
+var APP_NAME = 'WebTorrent'
+var APP_TEAM = 'WebTorrent, LLC'
+var APP_VERSION = require('../package.json').version
+
+var PORTABLE_PATH = path.join(path.dirname(process.execPath), 'Portable Settings')
+
+module.exports = {
+  ANNOUNCEMENT_URL: 'https://webtorrent.io/desktop/announcement',
+  AUTO_UPDATE_URL: 'https://webtorrent.io/desktop/update',
+  CRASH_REPORT_URL: 'https://webtorrent.io/desktop/crash-report',
+  TELEMETRY_URL: 'https://webtorrent.io/desktop/telemetry',
+
+  APP_COPYRIGHT: 'Copyright © 2014-2016 ' + APP_TEAM,
+  APP_FILE_ICON: path.join(__dirname, '..', 'static', 'WebTorrentFile'),
+  APP_ICON: path.join(__dirname, '..', 'static', 'WebTorrent'),
+  APP_NAME: APP_NAME,
+  APP_TEAM: APP_TEAM,
+  APP_VERSION: APP_VERSION,
+  APP_WINDOW_TITLE: APP_NAME + ' (BETA)',
+
+  CONFIG_PATH: getConfigPath(),
+
+  DEFAULT_TORRENTS: [
+    {
+      name: 'Big Buck Bunny',
+      posterFileName: 'bigBuckBunny.jpg',
+      torrentFileName: 'bigBuckBunny.torrent'
+    },
+    {
+      name: 'Cosmos Laundromat (Preview)',
+      posterFileName: 'cosmosLaundromat.jpg',
+      torrentFileName: 'cosmosLaundromat.torrent'
+    },
+    {
+      name: 'Sintel',
+      posterFileName: 'sintel.jpg',
+      torrentFileName: 'sintel.torrent'
+    },
+    {
+      name: 'Tears of Steel',
+      posterFileName: 'tearsOfSteel.jpg',
+      torrentFileName: 'tearsOfSteel.torrent'
+    },
+    {
+      name: 'The WIRED CD - Rip. Sample. Mash. Share.',
+      posterFileName: 'wiredCd.jpg',
+      torrentFileName: 'wiredCd.torrent'
+    }
+  ],
+
+  DELAYED_INIT: 3000 /* 3 seconds */,
+
+  DEFAULT_DOWNLOAD_PATH: getDefaultDownloadPath(),
+
+  GITHUB_URL: 'https://github.com/feross/webtorrent-desktop',
+  GITHUB_URL_ISSUES: 'https://github.com/feross/webtorrent-desktop/issues',
+  GITHUB_URL_RAW: 'https://raw.githubusercontent.com/feross/webtorrent-desktop/master',
+
+  HOME_PAGE_URL: 'https://webtorrent.io',
+
+  IS_PORTABLE: isPortable(),
+  IS_PRODUCTION: isProduction(),
+
+  POSTER_PATH: path.join(getConfigPath(), 'Posters'),
+  ROOT_PATH: path.join(__dirname, '..'),
+  STATIC_PATH: path.join(__dirname, '..', 'static'),
+  TORRENT_PATH: path.join(getConfigPath(), 'Torrents'),
+
+  WINDOW_ABOUT: 'file://' + path.join(__dirname, '..', 'static', 'about.html'),
+  WINDOW_MAIN: 'file://' + path.join(__dirname, '..', 'static', 'main.html'),
+  WINDOW_WEBTORRENT: 'file://' + path.join(__dirname, '..', 'static', 'webtorrent.html'),
+
+  WINDOW_MIN_HEIGHT: 38 + (120 * 2), // header height + 2 torrents
+  WINDOW_MIN_WIDTH: 425
+}
+
+function getConfigPath () {
+  if (isPortable()) {
+    return PORTABLE_PATH
+  } else {
+    return path.dirname(appConfig.filePath)
+  }
+}
+
+function getDefaultDownloadPath () {
+  if (!process || !process.type) {
+    return ''
+  }
+
+  if (isPortable()) {
+    return path.join(getConfigPath(), 'Downloads')
+  }
+
+  var electron = require('electron')
+
+  return process.type === 'renderer'
+    ? electron.remote.app.getPath('downloads')
+    : electron.app.getPath('downloads')
+}
+
+function isPortable () {
+  try {
+    return process.platform === 'win32' && isProduction() && !!fs.statSync(PORTABLE_PATH)
+  } catch (err) {
+    return false
+  }
+}
+
+function isProduction () {
+  if (!process.versions.electron) {
+    return false
+  }
+  if (process.platform === 'darwin') {
+    return !/\/Electron\.app\//.test(process.execPath)
+  }
+  if (process.platform === 'win32') {
+    return !/\\electron\.exe$/.test(process.execPath)
+  }
+  if (process.platform === 'linux') {
+    return !/\/electron$/.test(process.execPath)
+  }
+}

src/crash-reporter.js

@@ -0,0 +1,14 @@
+module.exports = {
+  init
+}
+
+var config = require('./config')
+var electron = require('electron')
+
+function init () {
+  electron.crashReporter.start({
+    companyName: config.APP_NAME,
+    productName: config.APP_NAME,
+    submitURL: config.CRASH_REPORT_URL
+  })
+}

src/main/announcement.js

@@ -0,0 +1,57 @@
+module.exports = {
+  init
+}
+
+var electron = require('electron')
+
+var config = require('../config')
+var log = require('./log')
+
+var ANNOUNCEMENT_URL = config.ANNOUNCEMENT_URL +
+  '?version=' + config.APP_VERSION +
+  '&platform=' + process.platform
+
+/**
+ * In certain situations, the WebTorrent team may need to show an announcement to
+ * all WebTorrent Desktop users. For example: a security notice, or an update
+ * notification (if the auto-updater stops working).
+ *
+ * When there is an announcement, the `ANNOUNCEMENT_URL` endpoint should return an
+ * HTTP 200 status code with a JSON object like this:
+ *
+ *   {
+ *     "title": "WebTorrent Desktop Announcement",
+ *     "message": "Security Issue in v0.xx",
+ *     "detail": "Please update to v0.xx as soon as possible..."
+ *   }
+ */
+function init () {
+  var get = require('simple-get')
+  get.concat(ANNOUNCEMENT_URL, onResponse)
+}
+
+function onResponse (err, res, data) {
+  if (err) return log(`Failed to retrieve announcement: ${err.message}`)
+  if (res.statusCode !== 200) return log('No announcement exists')
+
+  try {
+    data = JSON.parse(data.toString())
+  } catch (err) {
+    // Support plaintext announcement messages, using a default title.
+    data = {
+      title: 'WebTorrent Desktop Announcement',
+      message: data.toString(),
+      detail: data.toString()
+    }
+  }
+
+  electron.dialog.showMessageBox({
+    type: 'info',
+    buttons: ['OK'],
+    title: data.title,
+    message: data.message,
+    detail: data.detail
+  }, noop)
+}
+
+function noop () {}

src/main/dialog.js

@@ -0,0 +1,121 @@
+module.exports = {
+  openSeedFile,
+  openSeedDirectory,
+  openTorrentFile,
+  openTorrentAddress,
+  openFiles
+}
+
+var electron = require('electron')
+
+var log = require('./log')
+var windows = require('./windows')
+
+/**
+ * Show open dialog to create a single-file torrent.
+ */
+function openSeedFile () {
+  if (!windows.main.win) return
+  log('openSeedFile')
+  var opts = {
+    title: 'Select a file for the torrent.',
+    properties: [ 'openFile' ]
+  }
+  setTitle(opts.title)
+  electron.dialog.showOpenDialog(windows.main.win, opts, function (selectedPaths) {
+    resetTitle()
+    if (!Array.isArray(selectedPaths)) return
+    windows.main.dispatch('showCreateTorrent', selectedPaths)
+  })
+}
+
+/*
+ * Show open dialog to create a single-file or single-directory torrent. On
+ * Windows and Linux, open dialogs are for files *or* directories only, not both,
+ * so this function shows a directory dialog on those platforms.
+ */
+function openSeedDirectory () {
+  if (!windows.main.win) return
+  log('openSeedDirectory')
+  var opts = process.platform === 'darwin'
+    ? {
+      title: 'Select a file or folder for the torrent.',
+      properties: [ 'openFile', 'openDirectory' ]
+    }
+    : {
+      title: 'Select a folder for the torrent.',
+      properties: [ 'openDirectory' ]
+    }
+  setTitle(opts.title)
+  electron.dialog.showOpenDialog(windows.main.win, opts, function (selectedPaths) {
+    resetTitle()
+    if (!Array.isArray(selectedPaths)) return
+    windows.main.dispatch('showCreateTorrent', selectedPaths)
+  })
+}
+
+/*
+ * Show flexible open dialog that supports selecting .torrent files to add, or
+ * a file or folder to create a single-file or single-directory torrent.
+ */
+function openFiles () {
+  if (!windows.main.win) return
+  log('openFiles')
+  var opts = process.platform === 'darwin'
+    ? {
+      title: 'Select a file or folder to add.',
+      properties: [ 'openFile', 'openDirectory' ]
+    }
+    : {
+      title: 'Select a file to add.',
+      properties: [ 'openFile' ]
+    }
+  setTitle(opts.title)
+  electron.dialog.showOpenDialog(windows.main.win, opts, function (selectedPaths) {
+    resetTitle()
+    if (!Array.isArray(selectedPaths)) return
+    windows.main.dispatch('onOpen', selectedPaths)
+  })
+}
+
+/*
+ * Show open dialog to open a .torrent file.
+ */
+function openTorrentFile () {
+  if (!windows.main.win) return
+  log('openTorrentFile')
+  var opts = {
+    title: 'Select a .torrent file.',
+    filters: [{ name: 'Torrent Files', extensions: ['torrent'] }],
+    properties: [ 'openFile', 'multiSelections' ]
+  }
+  setTitle(opts.title)
+  electron.dialog.showOpenDialog(windows.main.win, opts, function (selectedPaths) {
+    resetTitle()
+    if (!Array.isArray(selectedPaths)) return
+    selectedPaths.forEach(function (selectedPath) {
+      windows.main.dispatch('addTorrent', selectedPath)
+    })
+  })
+}
+
+/*
+ * Show modal dialog to open a torrent URL (magnet uri, http torrent link, etc.)
+ */
+function openTorrentAddress () {
+  log('openTorrentAddress')
+  windows.main.dispatch('openTorrentAddress')
+}
+
+/**
+ * Dialogs on do not show a title on Mac, so the window title is used instead.
+ */
+function setTitle (title) {
+  if (process.platform === 'darwin') {
+    windows.main.dispatch('setTitle', title)
+  }
+}
+
+function resetTitle () {
+  windows.main.dispatch('resetTitle')
+}

src/main/dock.js

@@ -0,0 +1,58 @@
+module.exports = {
+  downloadFinished,
+  init,
+  setBadge
+}
+
+var electron = require('electron')
+
+var app = electron.app
+
+var dialog = require('./dialog')
+var log = require('./log')
+
+/**
+ * Add a right-click menu to the dock icon. (Mac)
+ */
+function init () {
+  if (!app.dock) return
+  var menu = electron.Menu.buildFromTemplate(getMenuTemplate())
+  app.dock.setMenu(menu)
+}
+
+/**
+ * Bounce the Downloads stack if `path` is inside the Downloads folder. (Mac)
+ */
+function downloadFinished (path) {
+  if (!app.dock) return
+  log(`downloadFinished: ${path}`)
+  app.dock.downloadFinished(path)
+}
+
+/**
+ * Display a counter badge for the app. (Mac, Linux)
+ */
+function setBadge (count) {
+  log(`setBadge: ${count}`)
+  app.setBadgeCount(Number(count))
+}
+
+function getMenuTemplate () {
+  return [
+    {
+      label: 'Create New Torrent...',
+      accelerator: 'CmdOrCtrl+N',
+      click: () => dialog.openSeedDirectory()
+    },
+    {
+      label: 'Open Torrent File...',
+      accelerator: 'CmdOrCtrl+O',
+      click: () => dialog.openTorrentFile()
+    },
+    {
+      label: 'Open Torrent Address...',
+      accelerator: 'CmdOrCtrl+U',
+      click: () => dialog.openTorrentAddress()
+    }
+  ]
+}

src/main/handlers.js

@@ -0,0 +1,362 @@
+module.exports = {
+  install,
+  uninstall
+}
+
+var config = require('../config')
+var path = require('path')
+
+function install () {
+  if (process.platform === 'darwin') {
+    installDarwin()
+  }
+  if (process.platform === 'win32') {
+    installWin32()
+  }
+  if (process.platform === 'linux') {
+    installLinux()
+  }
+}
+
+function uninstall () {
+  if (process.platform === 'darwin') {
+    uninstallDarwin()
+  }
+  if (process.platform === 'win32') {
+    uninstallWin32()
+  }
+  if (process.platform === 'linux') {
+    uninstallLinux()
+  }
+}
+
+function installDarwin () {
+  var electron = require('electron')
+  var app = electron.app
+
+  // On Mac, only protocols that are listed in `Info.plist` can be set as the
+  // default handler at runtime.
+  app.setAsDefaultProtocolClient('magnet')
+  app.setAsDefaultProtocolClient('stream-magnet')
+
+  // File handlers are defined in `Info.plist`.
+}
+
+function uninstallDarwin () {}
+
+var EXEC_COMMAND = [ process.execPath ]
+
+if (!config.IS_PRODUCTION) {
+  EXEC_COMMAND.push(config.ROOT_PATH)
+}
+
+function installWin32 () {
+  var Registry = require('winreg')
+
+  var log = require('./log')
+
+  var iconPath = path.join(
+    process.resourcesPath, 'app.asar.unpacked', 'static', 'WebTorrentFile.ico'
+  )
+  registerProtocolHandlerWin32(
+    'magnet',
+    'URL:BitTorrent Magnet URL',
+    iconPath,
+    EXEC_COMMAND
+  )
+  registerProtocolHandlerWin32(
+    'stream-magnet',
+    'URL:BitTorrent Stream-Magnet URL',
+    iconPath,
+    EXEC_COMMAND
+  )
+  registerFileHandlerWin32(
+    '.torrent',
+    'io.webtorrent.torrent',
+    'BitTorrent Document',
+    iconPath,
+    EXEC_COMMAND
+  )
+
+  /**
+   * To add a protocol handler, the following keys must be added to the Windows registry:
+   *
+   * HKEY_CLASSES_ROOT
+   *   $PROTOCOL
+   *     (Default) = "$NAME"
+   *     URL Protocol = ""
+   *     DefaultIcon
+   *       (Default) = "$ICON"
+   *     shell
+   *       open
+   *         command
+   *           (Default) = "$COMMAND" "%1"
+   *
+   * Source: https://msdn.microsoft.com/en-us/library/aa767914.aspx
+   *
+   * However, the "HKEY_CLASSES_ROOT" key can only be written by the Administrator user.
+   * So, we instead write to "HKEY_CURRENT_USER\Software\Classes", which is inherited by
+   * "HKEY_CLASSES_ROOT" anyway, and can be written by unprivileged users.
+   */
+
+  function registerProtocolHandlerWin32 (protocol, name, icon, command) {
+    var protocolKey = new Registry({
+      hive: Registry.HKCU, // HKEY_CURRENT_USER
+      key: '\\Software\\Classes\\' + protocol
+    })
+
+    setProtocol()
+
+    function setProtocol (err) {
+      if (err) log.error(err.message)
+      protocolKey.set('', Registry.REG_SZ, name, setURLProtocol)
+    }
+
+    function setURLProtocol (err) {
+      if (err) log.error(err.message)
+      protocolKey.set('URL Protocol', Registry.REG_SZ, '', setIcon)
+    }
+
+    function setIcon (err) {
+      if (err) log.error(err.message)
+
+      var iconKey = new Registry({
+        hive: Registry.HKCU,
+        key: '\\Software\\Classes\\' + protocol + '\\DefaultIcon'
+      })
+      iconKey.set('', Registry.REG_SZ, icon, setCommand)
+    }
+
+    function setCommand (err) {
+      if (err) log.error(err.message)
+
+      var commandKey = new Registry({
+        hive: Registry.HKCU,
+        key: '\\Software\\Classes\\' + protocol + '\\shell\\open\\command'
+      })
+      commandKey.set('', Registry.REG_SZ, `${commandToArgs(command)} "%1"`, done)
+    }
+
+    function done (err) {
+      if (err) log.error(err.message)
+    }
+  }
+
+  /**
+   * To add a file handler, the following keys must be added to the Windows registry:
+   *
+   * HKEY_CLASSES_ROOT
+   *   $EXTENSION
+   *     (Default) = "$EXTENSION_ID"
+   *   $EXTENSION_ID
+   *     (Default) = "$NAME"
+   *     DefaultIcon
+   *       (Default) = "$ICON"
+   *     shell
+   *       open
+   *         command
+   *           (Default) = "$COMMAND" "%1"
+   */
+  function registerFileHandlerWin32 (ext, id, name, icon, command) {
+    setExt()
+
+    function setExt () {
+      var extKey = new Registry({
+        hive: Registry.HKCU, // HKEY_CURRENT_USER
+        key: '\\Software\\Classes\\' + ext
+      })
+      extKey.set('', Registry.REG_SZ, id, setId)
+    }
+
+    function setId (err) {
+      if (err) log.error(err.message)
+
+      var idKey = new Registry({
+        hive: Registry.HKCU,
+        key: '\\Software\\Classes\\' + id
+      })
+      idKey.set('', Registry.REG_SZ, name, setIcon)
+    }
+
+    function setIcon (err) {
+      if (err) log.error(err.message)
+
+      var iconKey = new Registry({
+        hive: Registry.HKCU,
+        key: '\\Software\\Classes\\' + id + '\\DefaultIcon'
+      })
+      iconKey.set('', Registry.REG_SZ, icon, setCommand)
+    }
+
+    function setCommand (err) {
+      if (err) log.error(err.message)
+
+      var commandKey = new Registry({
+        hive: Registry.HKCU,
+        key: '\\Software\\Classes\\' + id + '\\shell\\open\\command'
+      })
+      commandKey.set('', Registry.REG_SZ, `${commandToArgs(command)} "%1"`, done)
+    }
+
+    function done (err) {
+      if (err) log.error(err.message)
+    }
+  }
+}
+
+function uninstallWin32 () {
+  var Registry = require('winreg')
+
+  unregisterProtocolHandlerWin32('magnet', EXEC_COMMAND)
+  unregisterProtocolHandlerWin32('stream-magnet', EXEC_COMMAND)
+  unregisterFileHandlerWin32('.torrent', 'io.webtorrent.torrent', EXEC_COMMAND)
+
+  function unregisterProtocolHandlerWin32 (protocol, command) {
+    getCommand()
+
+    function getCommand () {
+      var commandKey = new Registry({
+        hive: Registry.HKCU, // HKEY_CURRENT_USER
+        key: '\\Software\\Classes\\' + protocol + '\\shell\\open\\command'
+      })
+      commandKey.get('', function (err, item) {
+        if (!err && item.value.indexOf(commandToArgs(command)) >= 0) {
+          destroyProtocol()
+        }
+      })
+    }
+
+    function destroyProtocol () {
+      var protocolKey = new Registry({
+        hive: Registry.HKCU,
+        key: '\\Software\\Classes\\' + protocol
+      })
+      protocolKey.destroy(function () {})
+    }
+  }
+
+  function unregisterFileHandlerWin32 (ext, id, command) {
+    eraseId()
+
+    function eraseId () {
+      var idKey = new Registry({
+        hive: Registry.HKCU, // HKEY_CURRENT_USER
+        key: '\\Software\\Classes\\' + id
+      })
+      idKey.destroy(getExt)
+    }
+
+    function getExt () {
+      var extKey = new Registry({
+        hive: Registry.HKCU,
+        key: '\\Software\\Classes\\' + ext
+      })
+      extKey.get('', function (err, item) {
+        if (!err && item.value === id) {
+          destroyExt()
+        }
+      })
+    }
+
+    function destroyExt () {
+      var extKey = new Registry({
+        hive: Registry.HKCU, // HKEY_CURRENT_USER
+        key: '\\Software\\Classes\\' + ext
+      })
+      extKey.destroy(function () {})
+    }
+  }
+}
+
+function commandToArgs (command) {
+  return command.map((arg) => `"${arg}"`).join(' ')
+}
+
+function installLinux () {
+  var fs = require('fs-extra')
+  var os = require('os')
+  var path = require('path')
+
+  var config = require('../config')
+  var log = require('./log')
+
+  installDesktopFile()
+  installIconFile()
+
+  function installDesktopFile () {
+    var templatePath = path.join(
+      config.STATIC_PATH, 'linux', 'webtorrent-desktop.desktop'
+    )
+    fs.readFile(templatePath, 'utf8', writeDesktopFile)
+  }
+
+  function writeDesktopFile (err, desktopFile) {
+    if (err) return log.error(err.message)
+
+    var appPath = config.IS_PRODUCTION
+      ? path.dirname(process.execPath)
+      : config.ROOT_PATH
+
+    desktopFile = desktopFile.replace(/\$APP_NAME/g, config.APP_NAME)
+    desktopFile = desktopFile.replace(/\$APP_PATH/g, appPath)
+    desktopFile = desktopFile.replace(/\$EXEC_PATH/g, EXEC_COMMAND.join(' '))
+    desktopFile = desktopFile.replace(/\$TRY_EXEC_PATH/g, process.execPath)
+
+    var desktopFilePath = path.join(
+      os.homedir(),
+      '.local',
+      'share',
+      'applications',
+      'webtorrent-desktop.desktop'
+    )
+    fs.mkdirp(path.dirname(desktopFilePath))
+    fs.writeFile(desktopFilePath, desktopFile, function (err) {
+      if (err) return log.error(err.message)
+    })
+  }
+
+  function installIconFile () {
+    var iconStaticPath = path.join(config.STATIC_PATH, 'WebTorrent.png')
+    fs.readFile(iconStaticPath, writeIconFile)
+  }
+
+  function writeIconFile (err, iconFile) {
+    if (err) return log.error(err.message)
+
+    var iconFilePath = path.join(
+      os.homedir(),
+      '.local',
+      'share',
+      'icons',
+      'webtorrent-desktop.png'
+    )
+    fs.mkdirp(path.dirname(iconFilePath))
+    fs.writeFile(iconFilePath, iconFile, function (err) {
+      if (err) return log.error(err.message)
+    })
+  }
+}
+
+function uninstallLinux () {
+  var os = require('os')
+  var path = require('path')
+  var fs = require('fs-extra')
+
+  var desktopFilePath = path.join(
+    os.homedir(),
+    '.local',
+    'share',
+    'applications',
+    'webtorrent-desktop.desktop'
+  )
+  fs.removeSync(desktopFilePath)
+
+  var iconFilePath = path.join(
+    os.homedir(),
+    '.local',
+    'share',
+    'icons',
+    'webtorrent-desktop.png'
+  )
+  fs.removeSync(iconFilePath)
+}

src/main/index.js

@@ -0,0 +1,165 @@
+console.time('init')
+
+var electron = require('electron')
+
+var app = electron.app
+var ipcMain = electron.ipcMain
+
+var announcement = require('./announcement')
+var config = require('../config')
+var crashReporter = require('../crash-reporter')
+var dialog = require('./dialog')
+var dock = require('./dock')
+var handlers = require('./handlers')
+var ipc = require('./ipc')
+var log = require('./log')
+var menu = require('./menu')
+var squirrelWin32 = require('./squirrel-win32')
+var tray = require('./tray')
+var updater = require('./updater')
+var windows = require('./windows')
+
+var shouldQuit = false
+var argv = sliceArgv(process.argv)
+
+if (!argv.includes('--dev')) process.env.NODE_ENV = 'production'
+
+if (process.platform === 'win32') {
+  shouldQuit = squirrelWin32.handleEvent(argv[0])
+  argv = argv.filter((arg) => !arg.includes('--squirrel'))
+}
+
+if (!shouldQuit) {
+  // Prevent multiple instances of app from running at same time. New instances signal
+  // this instance and quit.
+  shouldQuit = app.makeSingleInstance(onAppOpen)
+  if (shouldQuit) {
+    app.quit()
+  }
+}
+
+if (!shouldQuit) {
+  init()
+}
+
+function init () {
+  if (config.IS_PORTABLE) {
+    app.setPath('userData', config.CONFIG_PATH)
+  }
+
+  var isReady = false // app ready, windows can be created
+  app.ipcReady = false // main window has finished loading and IPC is ready
+  app.isQuitting = false
+
+  // Open handlers must be added as early as possible
+  app.on('open-file', onOpen)
+  app.on('open-url', onOpen)
+
+  ipc.init()
+
+  app.once('will-finish-launching', function () {
+    crashReporter.init()
+  })
+
+  app.on('ready', function () {
+    isReady = true
+
+    windows.main.init()
+    windows.webtorrent.init()
+    menu.init()
+
+    // To keep app startup fast, some code is delayed.
+    setTimeout(delayedInit, config.DELAYED_INIT)
+
+    // Report uncaught exceptions
+    process.on('uncaughtException', (err) => {
+      console.error(err)
+      var errJSON = {message: err.message, stack: err.stack}
+      windows.main.dispatch('uncaughtError', 'main', errJSON)
+    })
+  })
+
+  app.once('ipcReady', function () {
+    log('Command line args:', argv)
+    processArgv(argv)
+    console.timeEnd('init')
+  })
+
+  app.on('before-quit', function (e) {
+    if (app.isQuitting) return
+
+    app.isQuitting = true
+    e.preventDefault()
+    windows.main.dispatch('saveState') // try to save state on exit
+    ipcMain.once('savedState', () => app.quit())
+    setTimeout(() => {
+      console.error('Saving state took too long. Quitting.')
+      app.quit()
+    }, 2000) // quit after 2 secs, at most
+  })
+
+  app.on('activate', function () {
+    if (isReady) windows.main.show()
+  })
+}
+
+function delayedInit () {
+  announcement.init()
+  dock.init()
+  handlers.install()
+  tray.init()
+  updater.init()
+}
+
+function onOpen (e, torrentId) {
+  e.preventDefault()
+
+  if (app.ipcReady) {
+    // Magnet links opened from Chrome won't focus the app without a setTimeout.
+    // The confirmation dialog Chrome shows causes Chrome to steal back the focus.
+    // Electron issue: https://github.com/atom/electron/issues/4338
+    setTimeout(() => windows.main.show(), 100)
+
+    processArgv([ torrentId ])
+  } else {
+    argv.push(torrentId)
+  }
+}
+
+function onAppOpen (newArgv) {
+  newArgv = sliceArgv(newArgv)
+
+  if (app.ipcReady) {
+    log('Second app instance opened, but was prevented:', newArgv)
+    windows.main.show()
+
+    processArgv(newArgv)
+  } else {
+    argv.push(...newArgv)
+  }
+}
+
+function sliceArgv (argv) {
+  return argv.slice(config.IS_PRODUCTION ? 1 : 2)
+}
+
+function processArgv (argv) {
+  var torrentIds = []
+  argv.forEach(function (arg) {
+    if (arg === '-n') {
+      dialog.openSeedDirectory()
+    } else if (arg === '-o') {
+      dialog.openTorrentFile()
+    } else if (arg === '-u') {
+      dialog.openTorrentAddress()
+    } else if (arg.startsWith('-psn')) {
+      // Ignore Mac launchd "process serial number" argument
+      // Issue: https://github.com/feross/webtorrent-desktop/issues/214
+    } else {
+      torrentIds.push(arg)
+    }
+  })
+  if (torrentIds.length > 0) {
+    windows.main.dispatch('onOpen', torrentIds)
+  }
+}

src/main/ipc.js

@@ -0,0 +1,182 @@
+module.exports = {
+  init
+}
+
+var electron = require('electron')
+
+var app = electron.app
+
+var dialog = require('./dialog')
+var dock = require('./dock')
+var log = require('./log')
+var menu = require('./menu')
+var powerSaveBlocker = require('./power-save-blocker')
+var shell = require('./shell')
+var shortcuts = require('./shortcuts')
+var vlc = require('./vlc')
+var windows = require('./windows')
+var thumbar = require('./thumbar')
+
+// Messages from the main process, to be sent once the WebTorrent process starts
+var messageQueueMainToWebTorrent = []
+
+// holds a ChildProcess while we're playing a video in VLC, null otherwise
+var vlcProcess
+
+function init () {
+  var ipc = electron.ipcMain
+
+  ipc.once('ipcReady', function (e) {
+    app.ipcReady = true
+    app.emit('ipcReady')
+  })
+
+  ipc.once('ipcReadyWebTorrent', function (e) {
+    app.ipcReadyWebTorrent = true
+    log('sending %d queued messages from the main win to the webtorrent window',
+      messageQueueMainToWebTorrent.length)
+    messageQueueMainToWebTorrent.forEach(function (message) {
+      windows.webtorrent.send(message.name, ...message.args)
+      log('webtorrent: sent queued %s', message.name)
+    })
+  })
+
+  /**
+   * Dialog
+   */
+
+  ipc.on('openTorrentFile', () => dialog.openTorrentFile())
+  ipc.on('openFiles', () => dialog.openFiles())
+
+  /**
+   * Dock
+   */
+
+  ipc.on('setBadge', (e, ...args) => dock.setBadge(...args))
+  ipc.on('downloadFinished', (e, ...args) => dock.downloadFinished(...args))
+
+  /**
+   * Events
+   */
+
+  ipc.on('onPlayerOpen', function () {
+    menu.onPlayerOpen()
+    powerSaveBlocker.enable()
+    shortcuts.enable()
+    thumbar.enable()
+  })
+
+  ipc.on('onPlayerClose', function () {
+    menu.onPlayerClose()
+    powerSaveBlocker.disable()
+    shortcuts.disable()
+    thumbar.disable()
+  })
+
+  ipc.on('onPlayerPlay', function () {
+    powerSaveBlocker.enable()
+    thumbar.onPlayerPlay()
+  })
+
+  ipc.on('onPlayerPause', function () {
+    powerSaveBlocker.disable()
+    thumbar.onPlayerPause()
+  })
+
+  /**
+   * Shell
+   */
+
+  ipc.on('openItem', (e, ...args) => shell.openItem(...args))
+  ipc.on('showItemInFolder', (e, ...args) => shell.showItemInFolder(...args))
+  ipc.on('moveItemToTrash', (e, ...args) => shell.moveItemToTrash(...args))
+
+  /**
+   * Windows: Main
+   */
+
+  var main = windows.main
+
+  ipc.on('setAspectRatio', (e, ...args) => main.setAspectRatio(...args))
+  ipc.on('setBounds', (e, ...args) => main.setBounds(...args))
+  ipc.on('setProgress', (e, ...args) => main.setProgress(...args))
+  ipc.on('setTitle', (e, ...args) => main.setTitle(...args))
+  ipc.on('show', () => main.show())
+  ipc.on('toggleFullScreen', (e, ...args) => main.toggleFullScreen(...args))
+
+  /**
+   * VLC
+   * TODO: Move most of this code to vlc.js
+   */
+
+  ipc.on('checkForVLC', function (e) {
+    vlc.checkForVLC(function (isInstalled) {
+      windows.main.send('checkForVLC', isInstalled)
+    })
+  })
+
+  ipc.on('vlcPlay', function (e, url, title) {
+    var args = ['--play-and-exit', '--video-on-top', '--no-video-title-show', '--quiet', `--meta-title=${title}`, url]
+    log('Running vlc ' + args.join(' '))
+
+    vlc.spawn(args, function (err, proc) {
+      if (err) return windows.main.dispatch('vlcNotFound')
+      vlcProcess = proc
+
+      // If it works, close the modal after a second
+      var closeModalTimeout = setTimeout(() =>
+        windows.main.dispatch('exitModal'), 1000)
+
+      vlcProcess.on('close', function (code) {
+        clearTimeout(closeModalTimeout)
+        if (!vlcProcess) return // Killed
+        log('VLC exited with code ', code)
+        if (code === 0) {
+          windows.main.dispatch('backToList')
+        } else {
+          windows.main.dispatch('vlcNotFound')
+        }
+        vlcProcess = null
+      })
+
+      vlcProcess.on('error', function (e) {
+        log('VLC error', e)
+      })
+    })
+  })
+
+  ipc.on('vlcQuit', function () {
+    if (!vlcProcess) return
+    log('Killing VLC, pid ' + vlcProcess.pid)
+    vlcProcess.kill('SIGKILL') // kill -9
+    vlcProcess = null
+  })
+
+  // Capture all events
+  var oldEmit = ipc.emit
+  ipc.emit = function (name, e, ...args) {
+    // Relay messages between the main window and the WebTorrent hidden window
+    if (name.startsWith('wt-') && !app.isQuitting) {
+      if (e.sender.browserWindowOptions.title === 'webtorrent-hidden-window') {
+        // Send message to main window
+        windows.main.send(name, ...args)
+        log('webtorrent: got %s', name)
+      } else if (app.ipcReadyWebTorrent) {
+        // Send message to webtorrent window
+        windows.webtorrent.send(name, ...args)
+        log('webtorrent: sent %s', name)
+      } else {
+        // Queue message for webtorrent window, it hasn't finished loading yet
+        messageQueueMainToWebTorrent.push({
+          name: name,
+          args: args
+        })
+        log('webtorrent: queueing %s', name)
+      }
+      return
+    }
+
+    // Emit all other events normally
+    oldEmit.call(ipc, name, e, ...args)
+  }
+}

src/main/log.js

@@ -0,0 +1,30 @@
+module.exports = log
+module.exports.error = error
+
+/**
+ * In the main electron process, we do not use console.log() statements because they do
+ * not show up in a convenient location when running the packaged (i.e. production)
+ * version of the app. Instead use this module, which sends the logs to the main window
+ * where they can be viewed in Developer Tools.
+ */
+
+var electron = require('electron')
+var windows = require('./windows')
+
+var app = electron.app
+
+function log (...args) {
+  if (app.ipcReady) {
+    windows.main.send('log', ...args)
+  } else {
+    app.once('ipcReady', () => windows.main.send('log', ...args))
+  }
+}
+
+function error (...args) {
+  if (app.ipcReady) {
+    windows.main.send('error', ...args)
+  } else {
+    app.once('ipcReady', () => windows.main.send('error', ...args))
+  }
+}

src/main/menu.js

@@ -0,0 +1,375 @@
+module.exports = {
+  init,
+  onPlayerClose,
+  onPlayerOpen,
+  onToggleAlwaysOnTop,
+  onToggleFullScreen,
+  onWindowBlur,
+  onWindowFocus
+}
+
+var electron = require('electron')
+
+var app = electron.app
+
+var config = require('../config')
+var dialog = require('./dialog')
+var shell = require('./shell')
+var windows = require('./windows')
+
+var menu
+
+function init () {
+  menu = electron.Menu.buildFromTemplate(getMenuTemplate())
+  electron.Menu.setApplicationMenu(menu)
+}
+
+function onPlayerClose () {
+  getMenuItem('Play/Pause').enabled = false
+  getMenuItem('Increase Volume').enabled = false
+  getMenuItem('Decrease Volume').enabled = false
+  getMenuItem('Step Forward').enabled = false
+  getMenuItem('Step Backward').enabled = false
+  getMenuItem('Increase Speed').enabled = false
+  getMenuItem('Decrease Speed').enabled = false
+  getMenuItem('Add Subtitles File...').enabled = false
+}
+
+function onPlayerOpen () {
+  getMenuItem('Play/Pause').enabled = true
+  getMenuItem('Increase Volume').enabled = true
+  getMenuItem('Decrease Volume').enabled = true
+  getMenuItem('Step Forward').enabled = true
+  getMenuItem('Step Backward').enabled = true
+  getMenuItem('Increase Speed').enabled = true
+  getMenuItem('Decrease Speed').enabled = true
+  getMenuItem('Add Subtitles File...').enabled = true
+}
+
+function onToggleAlwaysOnTop (flag) {
+  getMenuItem('Float on Top').checked = flag
+}
+
+function onToggleFullScreen (flag) {
+  getMenuItem('Full Screen').checked = flag
+}
+
+function onWindowBlur () {
+  getMenuItem('Full Screen').enabled = false
+  getMenuItem('Float on Top').enabled = false
+}
+
+function onWindowFocus () {
+  getMenuItem('Full Screen').enabled = true
+  getMenuItem('Float on Top').enabled = true
+}
+
+function getMenuItem (label) {
+  for (var i = 0; i < menu.items.length; i++) {
+    var menuItem = menu.items[i].submenu.items.find(function (item) {
+      return item.label === label
+    })
+    if (menuItem) return menuItem
+  }
+}
+
+function getMenuTemplate () {
+  var template = [
+    {
+      label: 'File',
+      submenu: [
+        {
+          label: process.platform === 'darwin'
+            ? 'Create New Torrent...'
+            : 'Create New Torrent from Folder...',
+          accelerator: 'CmdOrCtrl+N',
+          click: () => dialog.openSeedDirectory()
+        },
+        {
+          label: 'Open Torrent File...',
+          accelerator: 'CmdOrCtrl+O',
+          click: () => dialog.openTorrentFile()
+        },
+        {
+          label: 'Open Torrent Address...',
+          accelerator: 'CmdOrCtrl+U',
+          click: () => dialog.openTorrentAddress()
+        },
+        {
+          type: 'separator'
+        },
+        {
+          role: 'close'
+        }
+      ]
+    },
+    {
+      label: 'Edit',
+      submenu: [
+        {
+          role: 'undo'
+        },
+        {
+          role: 'redo'
+        },
+        {
+          type: 'separator'
+        },
+        {
+          role: 'cut'
+        },
+        {
+          role: 'copy'
+        },
+        {
+          label: 'Paste Torrent Address',
+          role: 'paste'
+        },
+        {
+          role: 'delete'
+        },
+        {
+          role: 'selectall'
+        },
+        {
+          type: 'separator'
+        },
+        {
+          label: 'Preferences',
+          accelerator: 'CmdOrCtrl+,',
+          click: () => windows.main.dispatch('preferences')
+        }
+      ]
+    },
+    {
+      label: 'View',
+      submenu: [
+        {
+          label: 'Full Screen',
+          type: 'checkbox',
+          accelerator: process.platform === 'darwin'
+            ? 'Ctrl+Command+F'
+            : 'F11',
+          click: () => windows.main.toggleFullScreen()
+        },
+        {
+          label: 'Float on Top',
+          type: 'checkbox',
+          click: () => windows.main.toggleAlwaysOnTop()
+        },
+        {
+          type: 'separator'
+        },
+        {
+          label: 'Go Back',
+          accelerator: 'Esc',
+          click: () => windows.main.dispatch('escapeBack')
+        },
+        {
+          type: 'separator'
+        },
+        {
+          label: 'Developer',
+          submenu: [
+            {
+              label: 'Developer Tools',
+              accelerator: process.platform === 'darwin'
+                ? 'Alt+Command+I'
+                : 'Ctrl+Shift+I',
+              click: () => windows.main.toggleDevTools()
+            },
+            {
+              label: 'Show WebTorrent Process',
+              accelerator: process.platform === 'darwin'
+                ? 'Alt+Command+P'
+                : 'Ctrl+Shift+P',
+              click: () => windows.webtorrent.toggleDevTools()
+            }
+          ]
+        }
+      ]
+    },
+    {
+      label: 'Playback',
+      submenu: [
+        {
+          label: 'Play/Pause',
+          accelerator: 'Space',
+          click: () => windows.main.dispatch('playPause'),
+          enabled: false
+        },
+        {
+          type: 'separator'
+        },
+        {
+          label: 'Increase Volume',
+          accelerator: 'CmdOrCtrl+Up',
+          click: () => windows.main.dispatch('changeVolume', 0.1),
+          enabled: false
+        },
+        {
+          label: 'Decrease Volume',
+          accelerator: 'CmdOrCtrl+Down',
+          click: () => windows.main.dispatch('changeVolume', -0.1),
+          enabled: false
+        },
+        {
+          type: 'separator'
+        },
+        {
+          label: 'Step Forward',
+          accelerator: process.platform === 'darwin'
+            ? 'CmdOrCtrl+Alt+Right'
+            : 'Alt+Right',
+          click: () => windows.main.dispatch('skip', 10),
+          enabled: false
+        },
+        {
+          label: 'Step Backward',
+          accelerator: process.platform === 'darwin'
+            ? 'CmdOrCtrl+Alt+Left'
+            : 'Alt+Left',
+          click: () => windows.main.dispatch('skip', -10),
+          enabled: false
+        },
+        {
+          type: 'separator'
+        },
+        {
+          label: 'Increase Speed',
+          accelerator: 'CmdOrCtrl+=',
+          click: () => windows.main.dispatch('changePlaybackRate', 1),
+          enabled: false
+        },
+        {
+          label: 'Decrease Speed',
+          accelerator: 'CmdOrCtrl+-',
+          click: () => windows.main.dispatch('changePlaybackRate', -1),
+          enabled: false
+        },
+        {
+          type: 'separator'
+        },
+        {
+          label: 'Add Subtitles File...',
+          click: () => windows.main.dispatch('openSubtitles'),
+          enabled: false
+        }
+      ]
+    },
+    {
+      label: 'Help',
+      role: 'help',
+      submenu: [
+        {
+          label: 'Learn more about ' + config.APP_NAME,
+          click: () => shell.openExternal(config.HOME_PAGE_URL)
+        },
+        {
+          label: 'Contribute on GitHub',
+          click: () => shell.openExternal(config.GITHUB_URL)
+        },
+        {
+          type: 'separator'
+        },
+        {
+          label: 'Report an Issue...',
+          click: () => shell.openExternal(config.GITHUB_URL_ISSUES)
+        }
+      ]
+    }
+  ]
+
+  if (process.platform === 'darwin') {
+    // Add WebTorrent app menu (Mac)
+    template.unshift({
+      label: config.APP_NAME,
+      submenu: [
+        {
+          role: 'about'
+        },
+        {
+          type: 'separator'
+        },
+        {
+          label: 'Preferences',
+          accelerator: 'Cmd+,',
+          click: () => windows.main.dispatch('preferences')
+        },
+        {
+          type: 'separator'
+        },
+        {
+          role: 'services',
+          submenu: []
+        },
+        {
+          type: 'separator'
+        },
+        {
+          role: 'hide'
+        },
+        {
+          role: 'hideothers'
+        },
+        {
+          role: 'unhide'
+        },
+        {
+          type: 'separator'
+        },
+        {
+          role: 'quit'
+        }
+      ]
+    })
+
+    // Add Window menu (Mac)
+    template.splice(5, 0, {
+      role: 'window',
+      submenu: [
+        {
+          role: 'minimize'
+        },
+        {
+          type: 'separator'
+        },
+        {
+          role: 'front'
+        }
+      ]
+    })
+  }
+
+  // On Windows and Linux, open dialogs do not support selecting both files and
+  // folders and files, so add an extra menu item so there is one for each type.
+  if (process.platform === 'linux' || process.platform === 'win32') {
+    // File menu (Windows, Linux)
+    template[0].submenu.unshift({
+      label: 'Create New Torrent from File...',
+      click: () => dialog.openSeedFile()
+    })
+
+    // Help menu (Windows, Linux)
+    template[4].submenu.push(
+      {
+        type: 'separator'
+      },
+      {
+        label: 'About ' + config.APP_NAME,
+        click: () => windows.about.init()
+      }
+    )
+  }
+  // Add "File > Quit" menu item so Linux distros where the system tray icon is
+  // missing will have a way to quit the app.
+  if (process.platform === 'linux') {
+    // File menu (Linux)
+    template[0].submenu.push({
+      label: 'Quit',
+      click: () => app.quit()
+    })
+  }
+
+  return template
+}

src/main/power-save-blocker.js

@@ -0,0 +1,30 @@
+module.exports = {
+  enable,
+  disable
+}
+
+var electron = require('electron')
+var log = require('./log')
+
+var blockId = 0
+
+/**
+ * Block the system from entering low-power (sleep) mode or turning off the
+ * display.
+ */
+function enable () {
+  disable() // Stop the previous power saver block, if one exists.
+  blockId = electron.powerSaveBlocker.start('prevent-display-sleep')
+  log(`powerSaveBlocker.enable: ${blockId}`)
+}
+
+/**
+ * Stop blocking the system from entering low-power mode.
+ */
+function disable () {
+  if (!electron.powerSaveBlocker.isStarted(blockId)) {
+    return
+  }
+  electron.powerSaveBlocker.stop(blockId)
+  log(`powerSaveBlocker.disable: ${blockId}`)
+}

src/main/shell.js

@@ -0,0 +1,41 @@
+module.exports = {
+  openExternal,
+  openItem,
+  showItemInFolder,
+  moveItemToTrash
+}
+
+var electron = require('electron')
+var log = require('./log')
+
+/**
+ * Open the given external protocol URL in the desktop’s default manner.
+ */
+function openExternal (url) {
+  log(`openExternal: ${url}`)
+  electron.shell.openExternal(url)
+}
+
+/**
+ * Open the given file in the desktop’s default manner.
+ */
+function openItem (path) {
+  log(`openItem: ${path}`)
+  electron.shell.openItem(path)
+}
+
+/**
+ * Show the given file in a file manager. If possible, select the file.
+ */
+function showItemInFolder (path) {
+  log(`showItemInFolder: ${path}`)
+  electron.shell.showItemInFolder(path)
+}
+
+/**
+ * Move the given file to trash and returns a boolean status for the operation.
+ */
+function moveItemToTrash (path) {
+  log(`moveItemToTrash: ${path}`)
+  electron.shell.moveItemToTrash(path)
+}

src/main/shortcuts.js

@@ -0,0 +1,20 @@
+module.exports = {
+  disable,
+  enable
+}
+
+var electron = require('electron')
+var windows = require('./windows')
+
+function enable () {
+  // Register play/pause media key, available on some keyboards.
+  electron.globalShortcut.register(
+    'MediaPlayPause',
+    () => windows.main.dispatch('playPause')
+  )
+}
+
+function disable () {
+  // Return the media key to the OS, so other apps can use it.
+  electron.globalShortcut.unregister('MediaPlayPause')
+}

src/main/squirrel-win32.js

@@ -0,0 +1,151 @@
+module.exports = {
+  handleEvent
+}
+
+var cp = require('child_process')
+var electron = require('electron')
+var fs = require('fs')
+var os = require('os')
+var path = require('path')
+
+var app = electron.app
+
+var handlers = require('./handlers')
+
+var EXE_NAME = path.basename(process.execPath)
+var UPDATE_EXE = path.join(process.execPath, '..', '..', 'Update.exe')
+
+function handleEvent (cmd) {
+  if (cmd === '--squirrel-install') {
+    // App was installed. Install desktop/start menu shortcuts.
+    createShortcuts(function () {
+      // Ensure user sees install splash screen so they realize that Setup.exe actually
+      // installed an application and isn't the application itself.
+      setTimeout(function () {
+        app.quit()
+      }, 3000)
+    })
+    return true
+  }
+
+  if (cmd === '--squirrel-updated') {
+    // App was updated. (Called on new version of app)
+    updateShortcuts(function () {
+      app.quit()
+    })
+    return true
+  }
+
+  if (cmd === '--squirrel-uninstall') {
+    // App was just uninstalled. Undo anything we did in the --squirrel-install and
+    // --squirrel-updated handlers
+
+    // Uninstall .torrent file and magnet link handlers
+    handlers.uninstall()
+
+    // Remove desktop/start menu shortcuts.
+    // HACK: add a callback to handlers.uninstall() so we can remove this setTimeout
+    setTimeout(function () {
+      removeShortcuts(function () {
+        app.quit()
+      })
+    }, 1000)
+
+    return true
+  }
+
+  if (cmd === '--squirrel-obsolete') {
+    // App will be updated. (Called on outgoing version of app)
+    app.quit()
+    return true
+  }
+
+  if (cmd === '--squirrel-firstrun') {
+    // App is running for the first time. Do not quit, allow startup to continue.
+    return false
+  }
+
+  return false
+}
+
+/**
+ * Spawn a command and invoke the callback when it completes with an error and
+ * the output from standard out.
+ */
+function spawn (command, args, cb) {
+  var stdout = ''
+
+  var child
+  try {
+    child = cp.spawn(command, args)
+  } catch (err) {
+    // Spawn can throw an error
+    process.nextTick(function () {
+      cb(error, stdout)
+    })
+    return
+  }
+
+  child.stdout.on('data', function (data) {
+    stdout += data
+  })
+
+  var error = null
+  child.on('error', function (processError) {
+    error = processError
+  })
+  child.on('close', function (code, signal) {
+    if (code !== 0 && !error) error = new Error('Command failed: #{signal || code}')
+    if (error) error.stdout = stdout
+    cb(error, stdout)
+  })
+}
+
+/**
+ * Spawn the Squirrel `Update.exe` command with the given arguments and invoke
+ * the callback when the command completes.
+ */
+function spawnUpdate (args, cb) {
+  spawn(UPDATE_EXE, args, cb)
+}
+
+/**
+ * Create desktop and start menu shortcuts using the Squirrel `Update.exe`
+ * command.
+ */
+function createShortcuts (cb) {
+  spawnUpdate(['--createShortcut', EXE_NAME], cb)
+}
+
+/**
+ * Update desktop and start menu shortcuts using the Squirrel `Update.exe`
+ * command.
+ */
+function updateShortcuts (cb) {
+  var homeDir = os.homedir()
+  if (homeDir) {
+    var desktopShortcutPath = path.join(homeDir, 'Desktop', 'WebTorrent.lnk')
+    // If the desktop shortcut was deleted by the user, then keep it deleted.
+    fs.access(desktopShortcutPath, function (err) {
+      var desktopShortcutExists = !err
+      createShortcuts(function () {
+        if (desktopShortcutExists) {
+          cb()
+        } else {
+          // Remove the unwanted desktop shortcut that was recreated
+          fs.unlink(desktopShortcutPath, cb)
+        }
+      })
+    })
+  } else {
+    createShortcuts(cb)
+  }
+}
+
+/**
+ * Remove desktop and start menu shortcuts using the Squirrel `Update.exe`
+ * command.
+ */
+function removeShortcuts (cb) {
+  spawnUpdate(['--removeShortcut', EXE_NAME], cb)
+}

src/main/thumbar.js

@@ -0,0 +1,54 @@
+module.exports = {
+  disable,
+  enable,
+  onPlayerPause,
+  onPlayerPlay
+}
+
+/**
+ * On Windows, add a "thumbnail toolbar" with a play/pause button in the taskbar.
+ * This provides users a way to access play/pause functionality without restoring
+ * or activating the window.
+ */
+
+var path = require('path')
+var config = require('../config')
+
+var windows = require('./windows')
+
+/**
+ * Show the Windows thumbnail toolbar buttons.
+ */
+function enable () {
+  update(false)
+}
+
+/**
+ * Hide the Windows thumbnail toolbar buttons.
+ */
+function disable () {
+  windows.main.win.setThumbarButtons([])
+}
+
+function onPlayerPause () {
+  update(true)
+}
+
+function onPlayerPlay () {
+  update(false)
+}
+
+function update (isPaused) {
+  var icon = isPaused
+    ? 'PlayThumbnailBarButton.png'
+    : 'PauseThumbnailBarButton.png'
+
+  var buttons = [
+    {
+      tooltip: isPaused ? 'Play' : 'Pause',
+      icon: path.join(config.STATIC_PATH, icon),
+      click: () => windows.main.dispatch('playPause')
+    }
+  ]
+  windows.main.win.setThumbarButtons(buttons)
+}

src/main/tray.js

@@ -0,0 +1,115 @@
+module.exports = {
+  hasTray,
+  init,
+  onWindowBlur,
+  onWindowFocus
+}
+
+var electron = require('electron')
+
+var app = electron.app
+
+var config = require('../config')
+var windows = require('./windows')
+
+var tray
+
+function init () {
+  if (process.platform === 'linux') {
+    initLinux()
+  }
+  if (process.platform === 'win32') {
+    initWin32()
+  }
+  // Mac apps generally do not have menu bar icons
+}
+
+/**
+ * Returns true if there a tray icon is active.
+ */
+function hasTray () {
+  return !!tray
+}
+
+function onWindowBlur () {
+  if (!tray) return
+  updateTrayMenu()
+}
+
+function onWindowFocus () {
+  if (!tray) return
+  updateTrayMenu()
+}
+
+function initLinux () {
+  checkLinuxTraySupport(function (supportsTray) {
+    if (supportsTray) createTray()
+  })
+}
+
+function initWin32 () {
+  createTray()
+}
+
+/**
+ * Check for libappindicator1 support before creating tray icon
+ */
+function checkLinuxTraySupport (cb) {
+  var cp = require('child_process')
+
+  // Check that we're on Ubuntu (or another debian system) and that we have
+  // libappindicator1. If WebTorrent was installed from the deb file, we should
+  // always have it. If it was installed from the zip file, we might not.
+  cp.exec('dpkg --get-selections libappindicator1', function (err, stdout) {
+    if (err) return cb(false)
+    // Unfortunately there's no cleaner way, as far as I can tell, to check
+    // whether a debian package is installed:
+    cb(stdout.endsWith('\tinstall\n'))
+  })
+}
+
+function createTray () {
+  tray = new electron.Tray(getIconPath())
+
+  // On Windows, left click opens the app, right click opens the context menu.
+  // On Linux, any click (left or right) opens the context menu.
+  tray.on('click', () => windows.main.show())
+
+  // Show the tray context menu, and keep the available commands up to date
+  updateTrayMenu()
+}
+
+function updateTrayMenu () {
+  var contextMenu = electron.Menu.buildFromTemplate(getMenuTemplate())
+  tray.setContextMenu(contextMenu)
+}
+
+function getMenuTemplate () {
+  return [
+    getToggleItem(),
+    {
+      label: 'Quit',
+      click: () => app.quit()
+    }
+  ]
+
+  function getToggleItem () {
+    if (windows.main.win.isVisible()) {
+      return {
+        label: 'Hide to tray',
+        click: () => windows.main.hide()
+      }
+    } else {
+      return {
+        label: 'Show WebTorrent',
+        click: () => windows.main.show()
+      }
+    }
+  }
+}
+
+function getIconPath () {
+  return process.platform === 'win32'
+    ? config.APP_ICON + '.ico'
+    : config.APP_ICON + '.png'
+}

src/main/updater.js

@@ -0,0 +1,76 @@
+module.exports = {
+  init
+}
+
+var electron = require('electron')
+var get = require('simple-get')
+
+var config = require('../config')
+var log = require('./log')
+var windows = require('./windows')
+
+var AUTO_UPDATE_URL = config.AUTO_UPDATE_URL +
+  '?version=' + config.APP_VERSION +
+  '&platform=' + process.platform
+
+function init () {
+  if (process.platform === 'linux') {
+    initLinux()
+  } else {
+    initDarwinWin32()
+  }
+}
+
+// The Electron auto-updater does not support Linux yet, so manually check for
+// updates and show the user a modal notification.
+function initLinux () {
+  get.concat(AUTO_UPDATE_URL, onResponse)
+}
+
+function onResponse (err, res, data) {
+  if (err) return log(`Update error: ${err.message}`)
+  if (res.statusCode === 200) {
+    // Update available
+    try {
+      data = JSON.parse(data)
+    } catch (err) {
+      return log(`Update error: Invalid JSON response: ${err.message}`)
+    }
+    windows.main.dispatch('updateAvailable', data.version)
+  } else if (res.statusCode === 204) {
+    // No update available
+  } else {
+    // Unexpected status code
+    log(`Update error: Unexpected status code: ${res.statusCode}`)
+  }
+}
+
+function initDarwinWin32 () {
+  electron.autoUpdater.on(
+    'error',
+    (err) => log.error(`Update error: ${err.message}`)
+  )
+
+  electron.autoUpdater.on(
+    'checking-for-update',
+    () => log('Checking for update')
+  )
+
+  electron.autoUpdater.on(
+    'update-available',
+    () => log('Update available')
+  )
+
+  electron.autoUpdater.on(
+    'update-not-available',
+    () => log('Update not available')
+  )
+
+  electron.autoUpdater.on(
+    'update-downloaded',
+    (e, notes, name, date, url) => log(`Update downloaded: ${name}: ${url}`)
+  )
+
+  electron.autoUpdater.setFeedURL(AUTO_UPDATE_URL)
+  electron.autoUpdater.checkForUpdates()
+}

src/main/vlc.js

@@ -0,0 +1,22 @@
+module.exports = {
+  checkForVLC,
+  spawn
+}
+
+var cp = require('child_process')
+var vlcCommand = require('vlc-command')
+
+// Finds if VLC is installed on Mac, Windows, or Linux.
+// Calls back with true or false: whether VLC was detected
+function checkForVLC (cb) {
+  vlcCommand((err) => cb(!err))
+}
+
+// Spawns VLC with child_process.spawn() to return a ChildProcess object
+// Calls back with (err, childProcess)
+function spawn (args, cb) {
+  vlcCommand(function (err, vlcPath) {
+    if (err) return cb(err)
+    cb(null, cp.spawn(vlcPath, args))
+  })
+}

src/main/windows/about.js

@@ -0,0 +1,48 @@
+var about = module.exports = {
+  init,
+  win: null
+}
+
+var config = require('../../config')
+var electron = require('electron')
+
+function init () {
+  if (about.win) {
+    return about.win.show()
+  }
+
+  var win = about.win = new electron.BrowserWindow({
+    backgroundColor: '#ECECEC',
+    center: true,
+    fullscreen: false,
+    height: 170,
+    icon: getIconPath(),
+    maximizable: false,
+    minimizable: false,
+    resizable: false,
+    show: false,
+    skipTaskbar: true,
+    title: 'About ' + config.APP_WINDOW_TITLE,
+    useContentSize: true,
+    width: 300
+  })
+
+  win.loadURL(config.WINDOW_ABOUT)
+
+  // No menu on the About window
+  win.setMenu(null)
+
+  win.webContents.once('did-finish-load', function () {
+    win.show()
+  })
+
+  win.once('closed', function () {
+    about.win = null
+  })
+}
+
+function getIconPath () {
+  return process.platform === 'win32'
+    ? config.APP_ICON + '.ico'
+    : config.APP_ICON + '.png'
+}

src/main/windows/index.js

@@ -0,0 +1,3 @@
+exports.about = require('./about')
+exports.main = require('./main')
+exports.webtorrent = require('./webtorrent')

src/main/windows/main.js

@@ -0,0 +1,220 @@
+var main = module.exports = {
+  dispatch,
+  hide,
+  init,
+  send,
+  setAspectRatio,
+  setBounds,
+  setProgress,
+  setTitle,
+  show,
+  toggleAlwaysOnTop,
+  toggleDevTools,
+  toggleFullScreen,
+  win: null
+}
+
+var electron = require('electron')
+
+var app = electron.app
+
+var config = require('../../config')
+var log = require('../log')
+var menu = require('../menu')
+var tray = require('../tray')
+
+var HEADER_HEIGHT = 37
+var TORRENT_HEIGHT = 100
+
+function init () {
+  if (main.win) {
+    return main.win.show()
+  }
+  var win = main.win = new electron.BrowserWindow({
+    backgroundColor: '#1E1E1E',
+    darkTheme: true, // Forces dark theme (GTK+3)
+    icon: getIconPath(), // Window icon (Windows, Linux)
+    minWidth: config.WINDOW_MIN_WIDTH,
+    minHeight: config.WINDOW_MIN_HEIGHT,
+    title: config.APP_WINDOW_TITLE,
+    titleBarStyle: 'hidden-inset', // Hide title bar (Mac)
+    useContentSize: true, // Specify web page size without OS chrome
+    width: 500,
+    height: HEADER_HEIGHT + (TORRENT_HEIGHT * 6) // header height + 5 torrents
+  })
+
+  win.loadURL(config.WINDOW_MAIN)
+
+  if (win.setSheetOffset) win.setSheetOffset(HEADER_HEIGHT)
+
+  win.webContents.on('dom-ready', function () {
+    menu.onToggleFullScreen(main.win.isFullScreen())
+  })
+
+  win.on('blur', onWindowBlur)
+  win.on('focus', onWindowFocus)
+
+  win.on('hide', onWindowBlur)
+  win.on('show', onWindowFocus)
+
+  win.on('enter-full-screen', function () {
+    menu.onToggleFullScreen(true)
+    send('fullscreenChanged', true)
+    win.setMenuBarVisibility(false)
+  })
+
+  win.on('leave-full-screen', function () {
+    menu.onToggleFullScreen(false)
+    send('fullscreenChanged', false)
+    win.setMenuBarVisibility(true)
+  })
+
+  win.on('close', function (e) {
+    if (process.platform !== 'darwin' && !tray.hasTray()) {
+      app.quit()
+    } else if (!app.isQuitting) {
+      e.preventDefault()
+      hide()
+    }
+  })
+}
+
+function dispatch (...args) {
+  send('dispatch', ...args)
+}
+
+function hide () {
+  if (!main.win) return
+  main.win.send('dispatch', 'backToList')
+  main.win.hide()
+}
+
+function send (...args) {
+  if (!main.win) return
+  main.win.send(...args)
+}
+
+/**
+ * Enforce window aspect ratio. Remove with 0. (Mac)
+ */
+function setAspectRatio (aspectRatio) {
+  if (!main.win) return
+  main.win.setAspectRatio(aspectRatio)
+}
+
+/**
+ * Change the size of the window.
+ * TODO: Clean this up? Seems overly complicated.
+ */
+function setBounds (bounds, maximize) {
+  // Do nothing in fullscreen
+  if (!main.win || main.win.isFullScreen()) {
+    log('setBounds: not setting bounds because we\'re in full screen')
+    return
+  }
+
+  // Maximize or minimize, if the second argument is present
+  var willBeMaximized
+  if (maximize === true) {
+    if (!main.win.isMaximized()) {
+      log('setBounds: maximizing')
+      main.win.maximize()
+    }
+    willBeMaximized = true
+  } else if (maximize === false) {
+    if (main.win.isMaximized()) {
+      log('setBounds: unmaximizing')
+      main.win.unmaximize()
+    }
+    willBeMaximized = false
+  } else {
+    willBeMaximized = main.win.isMaximized()
+  }
+
+  // Assuming we're not maximized or maximizing, set the window size
+  if (!willBeMaximized) {
+    log('setBounds: setting bounds to ' + JSON.stringify(bounds))
+    if (bounds.x === null && bounds.y === null) {
+      // X and Y not specified? By default, center on current screen
+      var scr = electron.screen.getDisplayMatching(main.win.getBounds())
+      bounds.x = Math.round(scr.bounds.x + scr.bounds.width / 2 - bounds.width / 2)
+      bounds.y = Math.round(scr.bounds.y + scr.bounds.height / 2 - bounds.height / 2)
+      log('setBounds: centered to ' + JSON.stringify(bounds))
+    }
+    main.win.setBounds(bounds, true)
+  } else {
+    log('setBounds: not setting bounds because of window maximization')
+  }
+}
+
+/**
+ * Set progress bar to [0, 1]. Indeterminate when > 1. Remove with < 0.
+ */
+function setProgress (progress) {
+  if (!main.win) return
+  main.win.setProgressBar(progress)
+}
+
+function setTitle (title) {
+  if (!main.win) return
+  main.win.setTitle(title)
+}
+
+function show () {
+  if (!main.win) return
+  main.win.show()
+}
+
+// Sets whether the window should always show on top of other windows
+function toggleAlwaysOnTop (flag) {
+  if (!main.win) return
+  if (flag == null) {
+    flag = !main.win.isAlwaysOnTop()
+  }
+  log(`toggleAlwaysOnTop ${flag}`)
+  main.win.setAlwaysOnTop(flag)
+  menu.onToggleAlwaysOnTop(flag)
+}
+
+function toggleDevTools () {
+  if (!main.win) return
+  log('toggleDevTools')
+  if (main.win.webContents.isDevToolsOpened()) {
+    main.win.webContents.closeDevTools()
+  } else {
+    main.win.webContents.openDevTools({ detach: true })
+  }
+}
+
+function toggleFullScreen (flag) {
+  if (!main.win || !main.win.isVisible()) {
+    return
+  }
+
+  if (flag == null) flag = !main.win.isFullScreen()
+
+  log(`toggleFullScreen ${flag}`)
+
+  if (flag) {
+    // Fullscreen and aspect ratio do not play well together. (Mac)
+    main.win.setAspectRatio(0)
+  }
+
+  main.win.setFullScreen(flag)
+}
+
+function onWindowBlur () {
+  menu.onWindowBlur()
+  tray.onWindowBlur()
+}
+
+function onWindowFocus () {
+  menu.onWindowFocus()
+  tray.onWindowFocus()
+}
+
+function getIconPath () {
+  return process.platform === 'win32'
+    ? config.APP_ICON + '.ico'
+    : config.APP_ICON + '.png'
+}

src/main/windows/webtorrent.js

@@ -0,0 +1,62 @@
+var webtorrent = module.exports = {
+  init,
+  send,
+  show,
+  toggleDevTools,
+  win: null
+}
+
+var electron = require('electron')
+
+var config = require('../../config')
+var log = require('../log')
+
+function init () {
+  var win = webtorrent.win = new electron.BrowserWindow({
+    backgroundColor: '#1E1E1E',
+    center: true,
+    fullscreen: false,
+    fullscreenable: false,
+    height: 150,
+    maximizable: false,
+    minimizable: false,
+    resizable: false,
+    show: false,
+    skipTaskbar: true,
+    title: 'webtorrent-hidden-window',
+    useContentSize: true,
+    width: 150
+  })
+
+  win.loadURL(config.WINDOW_WEBTORRENT)
+
+  // Prevent killing the WebTorrent process
+  win.on('close', function (e) {
+    if (electron.app.isQuitting) {
+      return
+    }
+    e.preventDefault()
+    win.hide()
+  })
+}
+
+function show () {
+  if (!webtorrent.win) return
+  webtorrent.win.show()
+}
+
+function send (...args) {
+  if (!webtorrent.win) return
+  webtorrent.win.send(...args)
+}
+
+function toggleDevTools () {
+  if (!webtorrent.win) return
+  log('toggleDevTools')
+  if (webtorrent.win.webContents.isDevToolsOpened()) {
+    webtorrent.win.webContents.closeDevTools()
+    webtorrent.win.hide()
+  } else {
+    webtorrent.win.webContents.openDevTools({ detach: true })
+  }
+}

src/renderer/controllers/media-controller.js

@@ -0,0 +1,56 @@
+const electron = require('electron')
+
+const ipcRenderer = electron.ipcRenderer
+
+// Controls local play back: the <video>/<audio> tag and VLC
+// Does not control remote casting (Chromecast etc)
+module.exports = class MediaController {
+  constructor (state) {
+    this.state = state
+  }
+
+  mediaSuccess () {
+    this.state.playing.result = 'success'
+  }
+
+  mediaStalled () {
+    this.state.playing.isStalled = true
+  }
+
+  mediaError (error) {
+    var state = this.state
+    if (state.location.url() === 'player') {
+      state.playing.result = 'error'
+      state.playing.location = 'error'
+      ipcRenderer.send('checkForVLC')
+      ipcRenderer.once('checkForVLC', function (e, isInstalled) {
+        state.modal = {
+          id: 'unsupported-media-modal',
+          error: error,
+          vlcInstalled: isInstalled
+        }
+      })
+    }
+  }
+
+  mediaTimeUpdate () {
+    this.state.playing.lastTimeUpdate = new Date().getTime()
+    this.state.playing.isStalled = false
+  }
+
+  mediaMouseMoved () {
+    this.state.playing.mouseStationarySince = new Date().getTime()
+  }
+
+  vlcPlay () {
+    ipcRenderer.send('vlcPlay', this.state.server.localURL, this.state.window.title)
+    this.state.playing.location = 'vlc'
+  }
+
+  vlcNotFound () {
+    var modal = this.state.modal
+    if (modal && modal.id === 'unsupported-media-modal') {
+      modal.vlcNotFound = true
+    }
+  }
+}

src/renderer/controllers/playback-controller.js

@@ -0,0 +1,321 @@
+const electron = require('electron')
+const path = require('path')
+
+const Cast = require('../lib/cast')
+const {dispatch} = require('../lib/dispatcher')
+const telemetry = require('../lib/telemetry')
+const errors = require('../lib/errors')
+const sound = require('../lib/sound')
+const TorrentPlayer = require('../lib/torrent-player')
+const TorrentSummary = require('../lib/torrent-summary')
+const State = require('../lib/state')
+
+const ipcRenderer = electron.ipcRenderer
+
+// Controls playback of torrents and files within torrents
+// both local (<video>,<audio>,VLC) and remote (cast)
+module.exports = class PlaybackController {
+  constructor (state, config, update) {
+    this.state = state
+    this.config = config
+    this.update = update
+  }
+
+  // Play a file in a torrent.
+  // * Start torrenting, if necessary
+  // * Stream, if not already fully downloaded
+  // * If no file index is provided, pick the default file to play
+  playFile (infoHash, index /* optional */) {
+    this.state.location.go({
+      url: 'player',
+      setup: (cb) => {
+        this.play()
+        this.openPlayer(infoHash, index, cb)
+      },
+      destroy: () => this.closePlayer()
+    }, (err) => {
+      if (err) dispatch('error', err)
+    })
+  }
+
+  // Show a file in the OS, eg in Finder on a Mac
+  openItem (infoHash, index) {
+    var torrentSummary = TorrentSummary.getByKey(this.state, infoHash)
+    var filePath = path.join(
+      torrentSummary.path,
+      torrentSummary.files[index].path)
+    ipcRenderer.send('openItem', filePath)
+  }
+
+  // Toggle (play or pause) the currently playing media
+  playPause () {
+    var state = this.state
+    if (state.location.url() !== 'player') return
+
+    // force rerendering if window is hidden,
+    // in order to bypass `raf` and play/pause media immediately
+    var mediaTag = document.querySelector('video,audio')
+    if (!state.window.isVisible && mediaTag) {
+      if (state.playing.isPaused) mediaTag.play()
+      else mediaTag.pause()
+    }
+
+    if (state.playing.isPaused) this.play()
+    else this.pause()
+  }
+
+  // Play (unpause) the current media
+  play () {
+    var state = this.state
+    if (!state.playing.isPaused) return
+    state.playing.isPaused = false
+    if (isCasting(state)) {
+      Cast.play()
+    }
+    ipcRenderer.send('onPlayerPlay')
+  }
+
+  // Pause the currently playing media
+  pause () {
+    var state = this.state
+    if (state.playing.isPaused) return
+    state.playing.isPaused = true
+    if (isCasting(state)) {
+      Cast.pause()
+    }
+    ipcRenderer.send('onPlayerPause')
+  }
+
+  // Skip specified number of seconds (backwards if negative)
+  skip (time) {
+    this.skipTo(this.state.playing.currentTime + time)
+  }
+
+  // Skip (aka seek) to a specific point, in seconds
+  skipTo (time) {
+    if (isCasting(this.state)) Cast.seek(time)
+    else this.state.playing.jumpToTime = time
+  }
+
+  // Change playback speed. 1 = faster, -1 = slower
+  // Playback speed ranges from 16 (fast forward) to 1 (normal playback)
+  // to 0.25 (quarter-speed playback), then goes to -0.25, -0.5, -1, -2, etc
+  // until -16 (fast rewind)
+  changePlaybackRate (direction) {
+    var state = this.state
+    var rate = state.playing.playbackRate
+    if (direction > 0 && rate >= 0.25 && rate < 2) {
+      rate += 0.25
+    } else if (direction < 0 && rate > 0.25 && rate <= 2) {
+      rate -= 0.25
+    } else if (direction < 0 && rate === 0.25) { /* when we set playback rate at 0 in html 5, playback hangs ;( */
+      rate = -1
+    } else if (direction > 0 && rate === -1) {
+      rate = 0.25
+    } else if ((direction > 0 && rate >= 1 && rate < 16) || (direction < 0 && rate > -16 && rate <= -1)) {
+      rate *= 2
+    } else if ((direction < 0 && rate > 1 && rate <= 16) || (direction > 0 && rate >= -16 && rate < -1)) {
+      rate /= 2
+    }
+    state.playing.playbackRate = rate
+    if (isCasting(state) && !Cast.setRate(rate)) {
+      state.playing.playbackRate = 1
+    }
+  }
+
+  // Change the volume, in range [0, 1], by some amount
+  // For example, volume muted (0), changeVolume (0.3) increases to 30% volume
+  changeVolume (delta) {
+    // change volume with delta value
+    this.setVolume(this.state.playing.volume + delta)
+  }
+
+  // Set the volume to some value in [0, 1]
+  setVolume (volume) {
+    // check if its in [0.0 - 1.0] range
+    volume = Math.max(0, Math.min(1, volume))
+
+    var state = this.state
+    if (isCasting(state)) {
+      Cast.setVolume(volume)
+    } else {
+      state.playing.setVolume = volume
+    }
+  }
+
+  // Hide player controls while playing video, if the mouse stays still for a while
+  // Never hide the controls when:
+  // * The mouse is over the controls or we're scrubbing (see CSS)
+  // * The video is paused
+  // * The video is playing remotely on Chromecast or Airplay
+  showOrHidePlayerControls () {
+    var state = this.state
+    var hideControls = state.location.url() === 'player' &&
+      state.playing.mouseStationarySince !== 0 &&
+      new Date().getTime() - state.playing.mouseStationarySince > 2000 &&
+      !state.playing.isPaused &&
+      state.playing.location === 'local'
+
+    if (hideControls !== state.playing.hideControls) {
+      state.playing.hideControls = hideControls
+      return true
+    }
+    return false
+  }
+
+  // Opens the video player to a specific torrent
+  openPlayer (infoHash, index, cb) {
+    var torrentSummary = TorrentSummary.getByKey(this.state, infoHash)
+
+    // automatically choose which file in the torrent to play, if necessary
+    if (index === undefined) index = torrentSummary.defaultPlayFileIndex
+    if (index === undefined) index = TorrentPlayer.pickFileToPlay(torrentSummary.files)
+    if (index === undefined) return cb(new errors.UnplayableError())
+
+    // update UI to show pending playback
+    if (torrentSummary.progress !== 1) sound.play('PLAY')
+    // TODO: remove torrentSummary.playStatus
+    torrentSummary.playStatus = 'requested'
+    this.update()
+
+    var timeout = setTimeout(() => {
+      telemetry.logPlayAttempt('timeout')
+      // TODO: remove torrentSummary.playStatus
+      torrentSummary.playStatus = 'timeout' /* no seeders available? */
+      sound.play('ERROR')
+      cb(new Error('Playback timed out. Try again.'))
+      this.update()
+    }, 10000) /* give it a few seconds */
+
+    if (torrentSummary.status === 'paused') {
+      dispatch('startTorrentingSummary', torrentSummary)
+      ipcRenderer.once('wt-ready-' + torrentSummary.infoHash,
+        () => this.openPlayerFromActiveTorrent(torrentSummary, index, timeout, cb))
+    } else {
+      this.openPlayerFromActiveTorrent(torrentSummary, index, timeout, cb)
+    }
+  }
+
+function getOpenInVlc () {
+  return this.state.saved.prefs.playInVlc
+}
+
+  openPlayerFromActiveTorrent (torrentSummary, index, timeout, cb) {
+    var fileSummary = torrentSummary.files[index]
+}
+
+    // update state
+    var state = this.state
+    state.playing.infoHash = torrentSummary.infoHash
+    state.playing.fileIndex = index
+    state.playing.type = TorrentPlayer.isVideo(fileSummary) ? 'video'
+      : TorrentPlayer.isAudio(fileSummary) ? 'audio'
+      : 'other'
+
+    // pick up where we left off
+    if (fileSummary.currentTime) {
+      var fraction = fileSummary.currentTime / fileSummary.duration
+      var secondsLeft = fileSummary.duration - fileSummary.currentTime
+      if (fraction < 0.9 && secondsLeft > 10) {
+        state.playing.jumpToTime = fileSummary.currentTime
+      }
+    }
+
+    // if it's audio, parse out the metadata (artist, title, etc)
+    if (state.playing.type === 'audio' && !fileSummary.audioInfo) {
+      ipcRenderer.send('wt-get-audio-metadata', torrentSummary.infoHash, index)
+    }
+
+    // if it's video, check for subtitles files that are done downloading
+    dispatch('checkForSubtitles')
+
+    // enable previously selected subtitle track
+    if (fileSummary.selectedSubtitle) {
+      dispatch('addSubtitles', [fileSummary.selectedSubtitle], true)
+    }
+
+    ipcRenderer.send('wt-start-server', torrentSummary.infoHash, index)
+    ipcRenderer.once('wt-server-' + torrentSummary.infoHash, (e, info) => {
+      clearTimeout(timeout)
+
+      // if we timed out (user clicked play a long time ago), don't autoplay
+      var timedOut = torrentSummary.playStatus === 'timeout'
+      delete torrentSummary.playStatus
+      if (timedOut) {
+        ipcRenderer.send('wt-stop-server')
+        return this.update()
+      }
+
+      // otherwise, play the video
+      dispatch('setTitle', torrentSummary.files[state.playing.fileIndex].name)
+      this.update()
+
+      ipcRenderer.send('onPlayerOpen')
+      cb()
+    })
+  }
+
+    // play in VLC if set as default player (Preferences / Playback / Play in VLC)
+    if (getOpenInVlc()) {
+      dispatch('vlcPlay')
+      this.update()
+      cb()
+      return  
+    }
+
+  closePlayer () {
+    console.log('closePlayer')
+
+    // Quit any external players, like Chromecast/Airplay/etc or VLC
+    var state = this.state
+    if (isCasting(state)) {
+      Cast.stop()
+    }
+    if (state.playing.location === 'vlc') {
+      ipcRenderer.send('vlcQuit')
+    }
+
+    // Save volume (this session only, not in state.saved)
+    state.previousVolume = state.playing.volume
+
+    // Telemetry: track what happens after the user clicks play
+    var result = state.playing.result // 'success' or 'error'
+    if (result === 'success') telemetry.logPlayAttempt('success') // first frame displayed
+    else if (result === 'error') telemetry.logPlayAttempt('error') // codec missing, etc
+    else if (result === undefined) telemetry.logPlayAttempt('abandoned') // user exited before first frame
+    else console.error('Unknown state.playing.result', state.playing.result)
+
+    // Reset the window contents back to the home screen
+    state.playing = State.getDefaultPlayState()
+    state.server = null
+
+    // Reset the window size and location back to where it was
+    if (state.window.isFullScreen) {
+      dispatch('toggleFullScreen', false)
+    }
+    restoreBounds(state)
+
+    // Tell the WebTorrent process to kill the torrent-to-HTTP server
+    ipcRenderer.send('wt-stop-server')
+
+    ipcRenderer.send('onPlayerClose')
+
+    this.update()
+  }
+}
+
+// Checks whether we are connected and already casting
+// Returns false if we not casting (state.playing.location === 'local')
+// or if we're trying to connect but haven't yet ('chromecast-pending', etc)
+function isCasting (state) {
+  return state.playing.location === 'chromecast' ||
+    state.playing.location === 'airplay' ||
+    state.playing.location === 'dlna'
+}
+
+function restoreBounds (state) {
+  ipcRenderer.send('setAspectRatio', 0)
+  if (state.window.bounds) {
+    ipcRenderer.send('setBounds', state.window.bounds, false)
+  }
+}

src/renderer/controllers/prefs-controller.js

@@ -0,0 +1,47 @@
+const {dispatch} = require('../lib/dispatcher')
+const State = require('../lib/state')
+
+// Controls the Preferences screen
+module.exports = class PrefsController {
+  constructor (state, config) {
+    this.state = state
+    this.config = config
+  }
+
+  // Goes to the Preferences screen
+  show () {
+    var state = this.state
+    state.location.go({
+      url: 'preferences',
+      setup: function (cb) {
+        // initialize preferences
+        dispatch('setTitle', 'Preferences')
+        state.unsaved = Object.assign(state.unsaved || {}, {prefs: state.saved.prefs || {}})
+        cb()
+      },
+      destroy: () => this.save()
+    })
+  }
+
+  // Updates a single property in the UNSAVED prefs
+  // For example: updatePreferences('foo.bar', 'baz')
+  // Call save() to save to config.json
+  update (property, value) {
+    var path = property.split('.')
+    var key = this.state.unsaved.prefs
+    for (var i = 0; i < path.length - 1; i++) {
+      if (typeof key[path[i]] === 'undefined') {
+        key[path[i]] = {}
+      }
+      key = key[path[i]]
+    }
+    key[path[i]] = value
+  }
+
+  // All unsaved prefs take effect atomically, and are saved to config.json
+  save () {
+    var state = this.state
+    state.saved.prefs = Object.assign(state.saved.prefs || {}, state.unsaved.prefs)
+    State.save(state)
+  }
+}

src/renderer/controllers/subtitles-controller.js

@@ -0,0 +1,137 @@
+const electron = require('electron')
+const fs = require('fs-extra')
+const path = require('path')
+const parallel = require('run-parallel')
+
+const {dispatch} = require('../lib/dispatcher')
+
+module.exports = class SubtitlesController {
+  constructor (state) {
+    this.state = state
+  }
+
+  openSubtitles () {
+    electron.remote.dialog.showOpenDialog({
+      title: 'Select a subtitles file.',
+      filters: [ { name: 'Subtitles', extensions: ['vtt', 'srt'] } ],
+      properties: [ 'openFile' ]
+    }, (filenames) => {
+      if (!Array.isArray(filenames)) return
+      this.addSubtitles(filenames, true)
+    })
+  }
+
+  selectSubtitle (ix) {
+    this.state.playing.subtitles.selectedIndex = ix
+  }
+
+  toggleSubtitlesMenu () {
+    var subtitles = this.state.playing.subtitles
+    subtitles.showMenu = !subtitles.showMenu
+  }
+
+  addSubtitles (files, autoSelect) {
+    var state = this.state
+    // Subtitles are only supported when playing video files
+    if (state.playing.type !== 'video') return
+    if (files.length === 0) return
+    var subtitles = state.playing.subtitles
+
+    // Read the files concurrently, then add all resulting subtitle tracks
+    var tasks = files.map((file) => (cb) => loadSubtitle(file, cb))
+    parallel(tasks, function (err, tracks) {
+      if (err) return dispatch('error', err)
+
+      for (var i = 0; i < tracks.length; i++) {
+        // No dupes allowed
+        var track = tracks[i]
+        var trackIndex = state.playing.subtitles.tracks
+          .findIndex((t) => track.filePath === t.filePath)
+
+        // Add the track
+        if (trackIndex === -1) {
+          trackIndex = state.playing.subtitles.tracks.push(track) - 1
+        }
+
+        // If we're auto-selecting a track, try to find one in the user's language
+        if (autoSelect && (i === 0 || isSystemLanguage(track.language))) {
+          state.playing.subtitles.selectedIndex = trackIndex
+        }
+      }
+
+      // Finally, make sure no two tracks have the same label
+      relabelSubtitles(subtitles)
+    })
+  }
+
+  checkForSubtitles () {
+    if (this.state.playing.type !== 'video') return
+    var torrentSummary = this.state.getPlayingTorrentSummary()
+    if (!torrentSummary || !torrentSummary.progress) return
+
+    torrentSummary.progress.files.forEach((fp, ix) => {
+      if (fp.numPieces !== fp.numPiecesPresent) return // ignore incomplete files
+      var file = torrentSummary.files[ix]
+      if (!this.isSubtitle(file.name)) return
+      var filePath = path.join(torrentSummary.path, file.path)
+      this.addSubtitles([filePath], false)
+    })
+  }
+
+  isSubtitle (file) {
+    var name = typeof file === 'string' ? file : file.name
+    var ext = path.extname(name).toLowerCase()
+    return ext === '.srt' || ext === '.vtt'
+  }
+}
+
+function loadSubtitle (file, cb) {
+  // Lazy load to keep startup fast
+  var concat = require('simple-concat')
+  var LanguageDetect = require('languagedetect')
+  var srtToVtt = require('srt-to-vtt')
+
+  // Read the .SRT or .VTT file, parse it, add subtitle track
+  var filePath = file.path || file
+
+  var vttStream = fs.createReadStream(filePath).pipe(srtToVtt())
+
+  concat(vttStream, function (err, buf) {
+    if (err) return dispatch('error', 'Can\'t parse subtitles file.')
+
+    // Detect what language the subtitles are in
+    var vttContents = buf.toString().replace(/(.*-->.*)/g, '')
+    var langDetected = (new LanguageDetect()).detect(vttContents, 2)
+    langDetected = langDetected.length ? langDetected[0][0] : 'subtitle'
+    langDetected = langDetected.slice(0, 1).toUpperCase() + langDetected.slice(1)
+
+    var track = {
+      buffer: 'data:text/vtt;base64,' + buf.toString('base64'),
+      language: langDetected,
+      label: langDetected,
+      filePath: filePath
+    }
+
+    cb(null, track)
+  })
+}
+
+// Checks whether a language name like 'English' or 'German' matches the system
+// language, aka the current locale
+function isSystemLanguage (language) {
+  var iso639 = require('iso-639-1')
+  var osLangISO = window.navigator.language.split('-')[0] // eg 'en'
+  var langIso = iso639.getCode(language) // eg 'de' if language is 'German'
+  return langIso === osLangISO
+}
+
+// Make sure we don't have two subtitle tracks with the same label
+// Labels each track by language, eg 'German', 'English', 'English 2', ...
+function relabelSubtitles (subtitles) {
+  var counts = {}
+  subtitles.tracks.forEach(function (track) {
+    var lang = track.language
+    counts[lang] = (counts[lang] || 0) + 1
+    track.label = counts[lang] > 1 ? (lang + ' ' + counts[lang]) : lang
+  })
+}

src/renderer/controllers/torrent-controller.js

@@ -0,0 +1,190 @@
+const path = require('path')
+const ipcRenderer = require('electron').ipcRenderer
+
+const TorrentSummary = require('../lib/torrent-summary')
+const TorrentPlayer = require('../lib/torrent-player')
+const sound = require('../lib/sound')
+const {dispatch} = require('../lib/dispatcher')
+
+module.exports = class TorrentController {
+  constructor (state) {
+    this.state = state
+  }
+
+  torrentInfoHash (torrentKey, infoHash) {
+    var torrentSummary = this.getTorrentSummary(torrentKey)
+    console.log('got infohash for %s torrent %s',
+      torrentSummary ? 'existing' : 'new', torrentKey)
+
+    if (!torrentSummary) {
+      var torrents = this.state.saved.torrents
+
+      // Check if an existing (non-active) torrent has the same info hash
+      if (torrents.find((t) => t.infoHash === infoHash)) {
+        ipcRenderer.send('wt-stop-torrenting', infoHash)
+        return dispatch('error', 'Cannot add duplicate torrent')
+      }
+
+      torrentSummary = {
+        torrentKey: torrentKey,
+        status: 'new'
+      }
+      torrents.unshift(torrentSummary)
+      sound.play('ADD')
+    }
+
+    torrentSummary.infoHash = infoHash
+    dispatch('update')
+  }
+
+  torrentWarning (torrentKey, message) {
+    console.log('warning for torrent %s: %s', torrentKey, message)
+  }
+
+  torrentError (torrentKey, message) {
+    // TODO: WebTorrent needs semantic errors
+    if (message.startsWith('Cannot add duplicate torrent')) {
+      // Remove infohash from the message
+      message = 'Cannot add duplicate torrent'
+    }
+    dispatch('error', message)
+
+    var torrentSummary = this.getTorrentSummary(torrentKey)
+    if (torrentSummary) {
+      console.log('Pausing torrent %s due to error: %s', torrentSummary.infoHash, message)
+      torrentSummary.status = 'paused'
+      dispatch('update')
+    }
+  }
+
+  torrentMetadata (torrentKey, torrentInfo) {
+    // Summarize torrent
+    var torrentSummary = this.getTorrentSummary(torrentKey)
+    torrentSummary.status = 'downloading'
+    torrentSummary.name = torrentSummary.displayName || torrentInfo.name
+    torrentSummary.path = torrentInfo.path
+    torrentSummary.magnetURI = torrentInfo.magnetURI
+    // TODO: make torrentInfo immutable, save separately as torrentSummary.info
+    // For now, check whether torrentSummary.files has already been set:
+    var hasDetailedFileInfo = torrentSummary.files && torrentSummary.files[0].path
+    if (!hasDetailedFileInfo) {
+      torrentSummary.files = torrentInfo.files
+    }
+    if (!torrentSummary.selections) {
+      torrentSummary.selections = torrentSummary.files.map((x) => true)
+    }
+    torrentSummary.defaultPlayFileIndex = TorrentPlayer.pickFileToPlay(torrentInfo.files)
+    dispatch('update')
+
+    // Save the .torrent file, if it hasn't been saved already
+    if (!torrentSummary.torrentFileName) ipcRenderer.send('wt-save-torrent-file', torrentKey)
+
+    // Auto-generate a poster image, if it hasn't been generated already
+    if (!torrentSummary.posterFileName) ipcRenderer.send('wt-generate-torrent-poster', torrentKey)
+  }
+
+  torrentDone (torrentKey, torrentInfo) {
+    // Update the torrent summary
+    var torrentSummary = this.getTorrentSummary(torrentKey)
+    torrentSummary.status = 'seeding'
+
+    // Notify the user that a torrent finished, but only if we actually DL'd at least part of it.
+    // Don't notify if we merely finished verifying data files that were already on disk.
+    if (torrentInfo.bytesReceived > 0) {
+      if (!this.state.window.isFocused) {
+        this.state.dock.badge += 1
+      }
+      showDoneNotification(torrentSummary)
+      ipcRenderer.send('downloadFinished', getTorrentPath(torrentSummary))
+    }
+
+    dispatch('update')
+  }
+
+  torrentProgress (progressInfo) {
+    // Overall progress across all active torrents, 0 to 1
+    var progress = progressInfo.progress
+    var hasActiveTorrents = progressInfo.hasActiveTorrents
+
+    // Hide progress bar when client has no torrents, or progress is 100%
+    // TODO: isn't this equivalent to: if (progress === 1) ?
+    if (!hasActiveTorrents || progress === 1) {
+      progress = -1
+    }
+
+    // Show progress bar under the WebTorrent taskbar icon, on OSX
+    this.state.dock.progress = progress
+
+    // Update progress for each individual torrent
+    progressInfo.torrents.forEach((p) => {
+      var torrentSummary = this.getTorrentSummary(p.torrentKey)
+      if (!torrentSummary) {
+        console.log('warning: got progress for missing torrent %s', p.torrentKey)
+        return
+      }
+      torrentSummary.progress = p
+    })
+
+    // TODO: Find an efficient way to re-enable this line, which allows subtitle
+    //       files which are completed after a video starts to play to be added
+    //       dynamically to the list of subtitles.
+    // checkForSubtitles()
+  }
+
+  torrentFileModtimes (torrentKey, fileModtimes) {
+    var torrentSummary = this.getTorrentSummary(torrentKey)
+    torrentSummary.fileModtimes = fileModtimes
+    dispatch('saveStateThrottled')
+  }
+
+  torrentFileSaved (torrentKey, torrentFileName) {
+    console.log('torrent file saved %s: %s', torrentKey, torrentFileName)
+    var torrentSummary = this.getTorrentSummary(torrentKey)
+    torrentSummary.torrentFileName = torrentFileName
+    dispatch('saveStateThrottled')
+  }
+
+  torrentPosterSaved (torrentKey, posterFileName) {
+    var torrentSummary = this.getTorrentSummary(torrentKey)
+    torrentSummary.posterFileName = posterFileName
+    dispatch('saveStateThrottled')
+  }
+
+  torrentAudioMetadata (infoHash, index, info) {
+    var torrentSummary = this.getTorrentSummary(infoHash)
+    var fileSummary = torrentSummary.files[index]
+    fileSummary.audioInfo = info
+    dispatch('update')
+  }
+
+  torrentServerRunning (serverInfo) {
+    this.state.server = serverInfo
+  }
+
+  // Gets a torrent summary {name, infoHash, status} from state.saved.torrents
+  // Returns undefined if we don't know that infoHash
+  getTorrentSummary (torrentKey) {
+    return TorrentSummary.getByKey(this.state, torrentKey)
+  }
+}
+
+function getTorrentPath (torrentSummary) {
+  var itemPath = TorrentSummary.getFileOrFolder(torrentSummary)
+  if (torrentSummary.files.length > 1) {
+    itemPath = path.dirname(itemPath)
+  }
+  return itemPath
+}
+
+function showDoneNotification (torrent) {
+  var notif = new window.Notification('Download Complete', {
+    body: torrent.name,
+    silent: true
+  })
+
+  notif.onClick = function () {
+    ipcRenderer.send('show')
+  }
+
+  sound.play('DONE')
+}

src/renderer/controllers/torrent-list-controller.js

@@ -0,0 +1,282 @@
+const fs = require('fs')
+const path = require('path')
+const electron = require('electron')
+
+const {dispatch} = require('../lib/dispatcher')
+const State = require('../lib/state')
+const sound = require('../lib/sound')
+const TorrentSummary = require('../lib/torrent-summary')
+
+const ipcRenderer = electron.ipcRenderer
+
+const instantIoRegex = /^(https:\/\/)?instant\.io\/#/
+
+// Controls the torrent list: creating, adding, deleting, & manipulating torrents
+module.exports = class TorrentListController {
+  constructor (state) {
+    this.state = state
+  }
+
+  // Adds a torrent to the list, starts downloading/seeding. TorrentID can be a
+  // magnet URI, infohash, or torrent file: https://github.com/feross/webtorrent#clientaddtorrentid-opts-function-ontorrent-torrent-
+  addTorrent (torrentId) {
+    if (torrentId.path) {
+      // Use path string instead of W3C File object
+      torrentId = torrentId.path
+    }
+    // Allow a instant.io link to be pasted
+    // TODO: remove this once support is added to webtorrent core
+    if (typeof torrentId === 'string' && instantIoRegex.test(torrentId)) {
+      torrentId = torrentId.slice(torrentId.indexOf('#') + 1)
+    }
+
+    var torrentKey = this.state.nextTorrentKey++
+    var path = this.state.saved.prefs.downloadPath
+
+    ipcRenderer.send('wt-start-torrenting', torrentKey, torrentId, path)
+
+    dispatch('backToList')
+  }
+
+  // Shows the Create Torrent page with options to seed a given file or folder
+  showCreateTorrent (files) {
+    // Files will either be an array of file objects, which we can send directly
+    // to the create-torrent screen
+    if (files.length === 0 || typeof files[0] !== 'string') {
+      this.state.location.go({
+        url: 'create-torrent',
+        files: files
+      })
+      return
+    }
+
+    // ... or it will be an array of mixed file and folder paths. We have to walk
+    // through all the folders and find the files
+    findFilesRecursive(files, (allFiles) => this.showCreateTorrent(allFiles))
+  }
+
+  // Switches between the advanced and simple Create Torrent UI
+  toggleCreateTorrentAdvanced () {
+    var info = this.state.location.current()
+    if (info.url !== 'create-torrent') return
+    info.showAdvanced = !info.showAdvanced
+  }
+
+  // Creates a new torrent and start seeeding
+  createTorrent (options) {
+    var state = this.state
+    var torrentKey = state.nextTorrentKey++
+    ipcRenderer.send('wt-create-torrent', torrentKey, options)
+    state.location.backToFirst(function () {
+      state.location.clearForward('create-torrent')
+    })
+  }
+
+  // Starts downloading and/or seeding a given torrentSummary.
+  startTorrentingSummary (torrentSummary) {
+    var s = torrentSummary
+
+    // Backward compatibility for config files save before we had torrentKey
+    if (!s.torrentKey) s.torrentKey = this.state.nextTorrentKey++
+
+    // Use Downloads folder by default
+    if (!s.path) s.path = this.state.saved.prefs.downloadPath
+
+    ipcRenderer.send('wt-start-torrenting',
+                      s.torrentKey,
+                      TorrentSummary.getTorrentID(s),
+                      s.path,
+                      s.fileModtimes,
+                      s.selections)
+  }
+
+  // TODO: use torrentKey, not infoHash
+  toggleTorrent (infoHash) {
+    var torrentSummary = TorrentSummary.getByKey(this.state, infoHash)
+    if (torrentSummary.status === 'paused') {
+      torrentSummary.status = 'new'
+      this.startTorrentingSummary(torrentSummary)
+      sound.play('ENABLE')
+    } else {
+      torrentSummary.status = 'paused'
+      ipcRenderer.send('wt-stop-torrenting', torrentSummary.infoHash)
+      sound.play('DISABLE')
+    }
+  }
+
+  toggleTorrentFile (infoHash, index) {
+    var torrentSummary = TorrentSummary.getByKey(this.state, infoHash)
+    torrentSummary.selections[index] = !torrentSummary.selections[index]
+
+    // Let the WebTorrent process know to start or stop fetching that file
+    ipcRenderer.send('wt-select-files', infoHash, torrentSummary.selections)
+  }
+
+  confirmDeleteTorrent (infoHash, deleteData) {
+    this.state.modal = {
+      id: 'remove-torrent-modal',
+      infoHash,
+      deleteData
+    }
+  }
+
+  // TODO: use torrentKey, not infoHash
+  deleteTorrent (infoHash, deleteData) {
+    ipcRenderer.send('wt-stop-torrenting', infoHash)
+
+    var index = this.state.saved.torrents.findIndex((x) => x.infoHash === infoHash)
+
+    if (index > -1) {
+      var summary = this.state.saved.torrents[index]
+
+      // remove torrent and poster file
+      deleteFile(TorrentSummary.getTorrentPath(summary))
+      deleteFile(TorrentSummary.getPosterPath(summary)) // TODO: will the css path hack affect windows?
+
+      // optionally delete the torrent data
+      if (deleteData) moveItemToTrash(summary)
+
+      // remove torrent from saved list
+      this.state.saved.torrents.splice(index, 1)
+      State.saveThrottled(this.state)
+    }
+
+    this.state.location.clearForward('player') // prevent user from going forward to a deleted torrent
+    sound.play('DELETE')
+  }
+
+  toggleSelectTorrent (infoHash) {
+    if (this.state.selectedInfoHash === infoHash) {
+      this.state.selectedInfoHash = null
+    } else {
+      this.state.selectedInfoHash = infoHash
+    }
+  }
+
+  openTorrentContextMenu (infoHash) {
+    var torrentSummary = TorrentSummary.getByKey(this.state, infoHash)
+    var menu = new electron.remote.Menu()
+
+    menu.append(new electron.remote.MenuItem({
+      label: 'Remove From List',
+      click: () => dispatch('confirmDeleteTorrent', torrentSummary.infoHash, false)
+    }))
+
+    menu.append(new electron.remote.MenuItem({
+      label: 'Remove Data File',
+      click: () => dispatch('confirmDeleteTorrent', torrentSummary.infoHash, true)
+    }))
+
+    menu.append(new electron.remote.MenuItem({
+      type: 'separator'
+    }))
+
+    if (torrentSummary.files) {
+      menu.append(new electron.remote.MenuItem({
+        label: process.platform === 'darwin' ? 'Show in Finder' : 'Show in Folder',
+        click: () => showItemInFolder(torrentSummary)
+      }))
+      menu.append(new electron.remote.MenuItem({
+        type: 'separator'
+      }))
+    }
+
+    menu.append(new electron.remote.MenuItem({
+      label: 'Copy Magnet Link to Clipboard',
+      click: () => electron.clipboard.writeText(torrentSummary.magnetURI)
+    }))
+
+    menu.append(new electron.remote.MenuItem({
+      label: 'Copy Instant.io Link to Clipboard',
+      click: () => electron.clipboard.writeText(`https://instant.io/#${torrentSummary.infoHash}`)
+    }))
+
+    menu.append(new electron.remote.MenuItem({
+      label: 'Save Torrent File As...',
+      click: () => saveTorrentFileAs(torrentSummary)
+    }))
+
+    menu.popup(electron.remote.getCurrentWindow())
+  }
+}
+
+// Recursively finds {name, path, size} for all files in a folder
+// Calls `cb` on success, calls `onError` on failure
+function findFilesRecursive (paths, cb) {
+  if (paths.length > 1) {
+    var numComplete = 0
+    var ret = []
+    paths.forEach(function (path) {
+      findFilesRecursive([path], function (fileObjs) {
+        ret = ret.concat(fileObjs)
+        if (++numComplete === paths.length) {
+          ret.sort((a, b) => a.path < b.path ? -1 : a.path > b.path)
+          cb(ret)
+        }
+      })
+    })
+    return
+  }
+
+  var fileOrFolder = paths[0]
+  fs.stat(fileOrFolder, function (err, stat) {
+    if (err) return dispatch('error', err)
+
+    // Files: return name, path, and size
+    if (!stat.isDirectory()) {
+      var filePath = fileOrFolder
+      return cb([{
+        name: path.basename(filePath),
+        path: filePath,
+        size: stat.size
+      }])
+    }
+
+    // Folders: recurse, make a list of all the files
+    var folderPath = fileOrFolder
+    fs.readdir(folderPath, function (err, fileNames) {
+      if (err) return dispatch('error', err)
+      var paths = fileNames.map((fileName) => path.join(folderPath, fileName))
+      findFilesRecursive(paths, cb)
+    })
+  })
+}
+
+function deleteFile (path) {
+  if (!path) return
+  fs.unlink(path, function (err) {
+    if (err) dispatch('error', err)
+  })
+}
+
+// Delete all files in a torrent
+function moveItemToTrash (torrentSummary) {
+  var filePath = TorrentSummary.getFileOrFolder(torrentSummary)
+  ipcRenderer.send('moveItemToTrash', filePath)
+}
+
+function showItemInFolder (torrentSummary) {
+  ipcRenderer.send('showItemInFolder', TorrentSummary.getFileOrFolder(torrentSummary))
+}
+
+function saveTorrentFileAs (torrentSummary) {
+  var downloadPath = this.state.saved.prefs.downloadPath
+  var newFileName = path.parse(torrentSummary.name).name + '.torrent'
+  var opts = {
+    title: 'Save Torrent File',
+    defaultPath: path.join(downloadPath, newFileName),
+    filters: [
+      { name: 'Torrent Files', extensions: ['torrent'] },
+      { name: 'All Files', extensions: ['*'] }
+    ]
+  }
+  electron.remote.dialog.showSaveDialog(electron.remote.getCurrentWindow(), opts, function (savePath) {
+    var torrentPath = TorrentSummary.getTorrentPath(torrentSummary)
+    fs.readFile(torrentPath, function (err, torrentFile) {
+      if (err) return dispatch('error', err)
+      fs.writeFile(savePath, torrentFile, function (err) {
+        if (err) return dispatch('error', err)
+      })
+    })
+  })
+}

src/renderer/controllers/update-controller.js

@@ -0,0 +1,26 @@
+const State = require('../lib/state')
+
+// Controls the UI checking for new versions of the app, prompting install
+module.exports = class UpdateController {
+  constructor (state) {
+    this.state = state
+  }
+
+  // Shows a modal saying that we have an update
+  updateAvailable (version) {
+    var skipped = this.state.saved.skippedVersions
+    if (skipped && skipped.includes(version)) {
+      console.log('new version skipped by user: v' + version)
+      return
+    }
+    this.state.modal = { id: 'update-available-modal', version: version }
+  }
+
+  // Don't show the modal again until the next version
+  skipVersion (version) {
+    var skipped = this.state.saved.skippedVersions
+    if (!skipped) skipped = this.state.saved.skippedVersions = []
+    skipped.push(version)
+    State.saveThrottled(this.state)
+  }
+}

src/renderer/lib/capture-video-frame.js

@@ -0,0 +1,30 @@
+module.exports = captureVideoFrame
+
+function captureVideoFrame (video, format) {
+  if (typeof video === 'string') {
+    video = document.querySelector(video)
+  }
+
+  if (video == null || video.nodeName !== 'VIDEO') {
+    throw new Error('First argument must be a <video> element or selector')
+  }
+
+  if (format == null) {
+    format = 'png'
+  }
+
+  if (format !== 'png' && format !== 'jpg' && format !== 'webp') {
+    throw new Error('Second argument must be one of "png", "jpg", or "webp"')
+  }
+
+  var canvas = document.createElement('canvas')
+  canvas.width = video.videoWidth
+  canvas.height = video.videoHeight
+
+  canvas.getContext('2d').drawImage(video, 0, 0)
+
+  var dataUri = canvas.toDataURL('image/' + format)
+  var data = dataUri.split(',')[1]
+
+  return new Buffer(data, 'base64')
+}

src/renderer/lib/cast.js

@@ -0,0 +1,455 @@
+// The Cast module talks to Airplay and Chromecast
+// * Modifies state when things change
+// * Starts and stops casting, provides remote video controls
+module.exports = {
+  init,
+  toggleMenu,
+  selectDevice,
+  stop,
+  play,
+  pause,
+  seek,
+  setVolume,
+  setRate
+}
+
+// Lazy load these for a ~300ms improvement in startup time
+var airplayer, chromecasts, dlnacasts
+
+var config = require('../../config')
+
+// App state. Cast modifies state.playing and state.errors in response to events
+var state
+
+// Callback to notify module users when state has changed
+var update
+
+// setInterval() for updating cast status
+var statusInterval = null
+
+// Start looking for cast devices on the local network
+function init (appState, callback) {
+  state = appState
+  update = callback
+
+  // Load modules, scan the network for devices
+  airplayer = require('airplayer')()
+  chromecasts = require('chromecasts')()
+  dlnacasts = require('dlnacasts')()
+
+  state.devices.chromecast = chromecastPlayer()
+  state.devices.dlna = dlnaPlayer()
+  state.devices.airplay = airplayPlayer()
+
+  // Listen for devices: Chromecast, DLNA and Airplay
+  chromecasts.on('update', function (device) {
+    // TODO: how do we tell if there are *no longer* any Chromecasts available?
+    // From looking at the code, chromecasts.players only grows, never shrinks
+    state.devices.chromecast.addDevice(device)
+  })
+
+  dlnacasts.on('update', function (device) {
+    state.devices.dlna.addDevice(device)
+  })
+
+  airplayer.on('update', function (device) {
+    state.devices.airplay.addDevice(device)
+  })
+}
+
+// chromecast player implementation
+function chromecastPlayer () {
+  var ret = {
+    device: null,
+    addDevice,
+    getDevices,
+    open,
+    play,
+    pause,
+    stop,
+    status,
+    seek,
+    volume
+  }
+  return ret
+
+  function getDevices () {
+    return chromecasts.players
+  }
+
+  function addDevice (device) {
+    device.on('error', function (err) {
+      if (device !== ret.device) return
+      state.playing.location = 'local'
+      state.errors.push({
+        time: new Date().getTime(),
+        message: 'Could not connect to Chromecast. ' + err.message
+      })
+      update()
+    })
+    device.on('disconnect', function () {
+      if (device !== ret.device) return
+      state.playing.location = 'local'
+      update()
+    })
+  }
+
+  function open () {
+    var torrentSummary = state.saved.torrents.find((x) => x.infoHash === state.playing.infoHash)
+    ret.device.play(state.server.networkURL, {
+      type: 'video/mp4',
+      title: config.APP_NAME + ' - ' + torrentSummary.name
+    }, function (err) {
+      if (err) {
+        state.playing.location = 'local'
+        state.errors.push({
+          time: new Date().getTime(),
+          message: 'Could not connect to Chromecast. ' + err.message
+        })
+      } else {
+        state.playing.location = 'chromecast'
+      }
+      update()
+    })
+  }
+
+  function play (callback) {
+    ret.device.play(null, null, callback)
+  }
+
+  function pause (callback) {
+    ret.device.pause(callback)
+  }
+
+  function stop (callback) {
+    ret.device.stop(callback)
+  }
+
+  function status () {
+    ret.device.status(function (err, status) {
+      if (err) return console.log('error getting %s status: %o', state.playing.location, err)
+      state.playing.isPaused = status.playerState === 'PAUSED'
+      state.playing.currentTime = status.currentTime
+      state.playing.volume = status.volume.muted ? 0 : status.volume.level
+      update()
+    })
+  }
+
+  function seek (time, callback) {
+    ret.device.seek(time, callback)
+  }
+
+  function volume (volume, callback) {
+    ret.device.volume(volume, callback)
+  }
+}
+
+// airplay player implementation
+function airplayPlayer () {
+  var ret = {
+    device: null,
+    addDevice,
+    getDevices,
+    open,
+    play,
+    pause,
+    stop,
+    status,
+    seek,
+    volume
+  }
+  return ret
+
+  function addDevice (player) {
+    player.on('event', function (event) {
+      switch (event.state) {
+        case 'loading':
+          break
+        case 'playing':
+          state.playing.isPaused = false
+          break
+        case 'paused':
+          state.playing.isPaused = true
+          break
+        case 'stopped':
+          break
+      }
+      update()
+    })
+  }
+
+  function getDevices () {
+    return airplayer.players
+  }
+
+  function open () {
+    ret.device.play(state.server.networkURL, function (err, res) {
+      if (err) {
+        state.playing.location = 'local'
+        state.errors.push({
+          time: new Date().getTime(),
+          message: 'Could not connect to AirPlay. ' + err.message
+        })
+      } else {
+        state.playing.location = 'airplay'
+      }
+      update()
+    })
+  }
+
+  function play (callback) {
+    ret.device.resume(callback)
+  }
+
+  function pause (callback) {
+    ret.device.pause(callback)
+  }
+
+  function stop (callback) {
+    ret.device.stop(callback)
+  }
+
+  function status () {
+    ret.device.playbackInfo(function (err, res, status) {
+      if (err) {
+        state.playing.location = 'local'
+        state.errors.push({
+          time: new Date().getTime(),
+          message: 'Could not connect to AirPlay. ' + err.message
+        })
+      } else {
+        state.playing.isPaused = status.rate === 0
+        state.playing.currentTime = status.position
+        update()
+      }
+    })
+  }
+
+  function seek (time, callback) {
+    ret.device.scrub(time, callback)
+  }
+
+  function volume (volume, callback) {
+    // AirPlay doesn't support volume
+    // TODO: We should just disable the volume slider
+    state.playing.volume = volume
+  }
+}
+
+// DLNA player implementation
+function dlnaPlayer (player) {
+  var ret = {
+    device: null,
+    addDevice,
+    getDevices,
+    open,
+    play,
+    pause,
+    stop,
+    status,
+    seek,
+    volume
+  }
+  return ret
+
+  function getDevices () {
+    return dlnacasts.players
+  }
+
+  function addDevice (device) {
+    device.on('error', function (err) {
+      if (device !== ret.device) return
+      state.playing.location = 'local'
+      state.errors.push({
+        time: new Date().getTime(),
+        message: 'Could not connect to DLNA. ' + err.message
+      })
+      update()
+    })
+    device.on('disconnect', function () {
+      if (device !== ret.device) return
+      state.playing.location = 'local'
+      update()
+    })
+  }
+
+  function open () {
+    var torrentSummary = state.saved.torrents.find((x) => x.infoHash === state.playing.infoHash)
+    ret.device.play(state.server.networkURL, {
+      type: 'video/mp4',
+      title: config.APP_NAME + ' - ' + torrentSummary.name,
+      seek: state.playing.currentTime > 10 ? state.playing.currentTime : 0
+    }, function (err) {
+      if (err) {
+        state.playing.location = 'local'
+        state.errors.push({
+          time: new Date().getTime(),
+          message: 'Could not connect to DLNA. ' + err.message
+        })
+      } else {
+        state.playing.location = 'dlna'
+      }
+      update()
+    })
+  }
+
+  function play (callback) {
+    ret.device.play(null, null, callback)
+  }
+
+  function pause (callback) {
+    ret.device.pause(callback)
+  }
+
+  function stop (callback) {
+    ret.device.stop(callback)
+  }
+
+  function status () {
+    ret.device.status(function (err, status) {
+      if (err) return console.log('error getting %s status: %o', state.playing.location, err)
+      state.playing.isPaused = status.playerState === 'PAUSED'
+      state.playing.currentTime = status.currentTime
+      state.playing.volume = status.volume.level
+      update()
+    })
+  }
+
+  function seek (time, callback) {
+    ret.device.seek(time, callback)
+  }
+
+  function volume (volume, callback) {
+    ret.device.volume(volume, function (err) {
+      // quick volume update
+      state.playing.volume = volume
+      callback(err)
+    })
+  }
+}
+
+// Start polling cast device state, whenever we're connected
+function startStatusInterval () {
+  statusInterval = setInterval(function () {
+    var player = getPlayer()
+    if (player) player.status()
+  }, 1000)
+}
+
+/*
+ * Shows the device menu for a given cast type ('chromecast', 'airplay', etc)
+ * The menu lists eg. all Chromecasts detected; the user can click one to cast.
+ * If the menu was already showing for that type, hides the menu.
+ */
+function toggleMenu (location) {
+  // If the menu is already showing, hide it
+  if (state.devices.castMenu && state.devices.castMenu.location === location) {
+    state.devices.castMenu = null
+    return
+  }
+
+  // Never cast to two devices at the same time
+  if (state.playing.location !== 'local') {
+    throw new Error('You can\'t connect to ' + location + ' when already connected to another device')
+  }
+
+  // Find all cast devices of the given type
+  var player = getPlayer(location)
+  var devices = player ? player.getDevices() : []
+  if (devices.length === 0) throw new Error('No ' + location + ' devices available')
+
+  // Show a menu
+  state.devices.castMenu = {location, devices}
+}
+
+function selectDevice (index) {
+  var {location, devices} = state.devices.castMenu
+
+  // Start casting
+  var player = getPlayer(location)
+  player.device = devices[index]
+  player.open()
+
+  // Poll the casting device's status every few seconds
+  startStatusInterval()
+
+  // Show the Connecting... screen
+  state.devices.castMenu = null
+  state.playing.castName = devices[index].name
+  state.playing.location = location + '-pending'
+  update()
+}
+
+// Stops casting, move video back to local screen
+function stop () {
+  var player = getPlayer()
+  if (player) {
+    player.stop(function () {
+      player.device = null
+      stoppedCasting()
+    })
+    clearInterval(statusInterval)
+  } else {
+    stoppedCasting()
+  }
+}
+
+function stoppedCasting () {
+  state.playing.location = 'local'
+  state.playing.jumpToTime = state.playing.currentTime
+  update()
+}
+
+function getPlayer (location) {
+  if (location) {
+    return state.devices[location]
+  } else if (state.playing.location === 'chromecast') {
+    return state.devices.chromecast
+  } else if (state.playing.location === 'airplay') {
+    return state.devices.airplay
+  } else if (state.playing.location === 'dlna') {
+    return state.devices.dlna
+  } else {
+    return null
+  }
+}
+
+function play () {
+  var player = getPlayer()
+  if (player) player.play(castCallback)
+}
+
+function pause () {
+  var player = getPlayer()
+  if (player) player.pause(castCallback)
+}
+
+function setRate (rate) {
+  var player
+  var result = true
+  if (state.playing.location === 'chromecast') {
+    // TODO find how to control playback rate on chromecast
+    castCallback()
+    result = false
+  } else if (state.playing.location === 'airplay') {
+    player = state.devices.airplay
+    player.rate(rate, castCallback)
+  } else {
+    result = false
+  }
+  return result
+}
+
+function seek (time) {
+  var player = getPlayer()
+  if (player) player.seek(time, castCallback)
+}
+
+function setVolume (volume) {
+  var player = getPlayer()
+  if (player) player.volume(volume, castCallback)
+}
+
+function castCallback () {
+  console.log('%s callback: %o', state.playing.location, arguments)
+}

src/renderer/lib/dispatcher.js

@@ -0,0 +1,39 @@
+module.exports = {
+  dispatch,
+  dispatcher,
+  setDispatch
+}
+
+var dispatchers = {}
+var _dispatch = function () {}
+
+function setDispatch (dispatch) {
+  _dispatch = dispatch
+}
+
+function dispatch (...args) {
+  _dispatch(...args)
+}
+
+// Most DOM event handlers are trivial functions like `() => dispatch(<args>)`.
+// For these, `dispatcher(<args>)` is preferred because it memoizes the handler
+// function. This prevents React from updating the listener functions on
+// each update().
+function dispatcher (...args) {
+  var str = JSON.stringify(args)
+  var handler = dispatchers[str]
+  if (!handler) {
+    handler = dispatchers[str] = function (e) {
+      // Do not propagate click to elements below the button
+      e.stopPropagation()
+
+      if (e.currentTarget.classList.contains('disabled')) {
+        // Ignore clicks on disabled elements
+        return
+      }
+
+      dispatch(...args)
+    }
+  }
+  return handler
+}

src/renderer/lib/errors.js

@@ -0,0 +1,8 @@
+module.exports = {
+  UnplayableError
+}
+
+function UnplayableError () {
+  this.message = 'Can\'t play any files in torrent'
+}
+UnplayableError.prototype = Error

src/renderer/lib/migrations.js

@@ -0,0 +1,95 @@
+/* eslint-disable camelcase */
+
+module.exports = {
+  run
+}
+
+var semver = require('semver')
+var config = require('../../config')
+
+// Change `state.saved` (which will be saved back to config.json on exit) as
+// needed, for example to deal with config.json format changes across versions
+function run (state) {
+  // Replace '{ version: 1 }' with app version (semver)
+  if (!semver.valid(state.saved.version)) {
+    state.saved.version = '0.0.0' // Pre-0.7.0 version, so run all migrations
+  }
+
+  var version = state.saved.version
+
+  if (semver.lt(version, '0.7.0')) {
+    migrate_0_7_0(state.saved)
+  }
+
+  if (semver.lt(version, '0.7.2')) {
+    migrate_0_7_2(state.saved)
+  }
+
+  // Config is now on the new version
+  state.saved.version = config.APP_VERSION
+}
+
+function migrate_0_7_0 (saved) {
+  console.log('migrate to 0.7.0')
+
+  var fs = require('fs-extra')
+  var path = require('path')
+
+  saved.torrents.forEach(function (ts) {
+    var infoHash = ts.infoHash
+
+    // Replace torrentPath with torrentFileName
+    // There are a number of cases to handle here:
+    // * Originally we used absolute paths
+    // * Then, relative paths for the default torrents, eg '../static/sintel.torrent'
+    // * Then, paths computed at runtime for default torrents, eg 'sintel.torrent'
+    // * Finally, now we're getting rid of torrentPath altogether
+    var src, dst
+    if (ts.torrentPath) {
+      console.log('replacing torrentPath %s', ts.torrentPath)
+      if (path.isAbsolute(ts.torrentPath) || ts.torrentPath.startsWith('..')) {
+        src = ts.torrentPath
+      } else {
+        src = path.join(config.STATIC_PATH, ts.torrentPath)
+      }
+      dst = path.join(config.TORRENT_PATH, infoHash + '.torrent')
+      // Synchronous FS calls aren't ideal, but probably OK in a migration
+      // that only runs once
+      if (src !== dst) fs.copySync(src, dst)
+
+      delete ts.torrentPath
+      ts.torrentFileName = infoHash + '.torrent'
+    }
+
+    // Replace posterURL with posterFileName
+    if (ts.posterURL) {
+      console.log('replacing posterURL %s', ts.posterURL)
+      var extension = path.extname(ts.posterURL)
+      src = path.isAbsolute(ts.posterURL)
+        ? ts.posterURL
+        : path.join(config.STATIC_PATH, ts.posterURL)
+      dst = path.join(config.POSTER_PATH, infoHash + extension)
+      // Synchronous FS calls aren't ideal, but probably OK in a migration
+      // that only runs once
+      if (src !== dst) fs.copySync(src, dst)
+
+      delete ts.posterURL
+      ts.posterFileName = infoHash + extension
+    }
+
+    // Fix exception caused by incorrect file ordering.
+    // https://github.com/feross/webtorrent-desktop/pull/604#issuecomment-222805214
+    delete ts.defaultPlayFileIndex
+    delete ts.files
+    delete ts.selections
+    delete ts.fileModtimes
+  })
+}
+
+function migrate_0_7_2 (saved) {
+  if (!saved.prefs) {
+    saved.prefs = {
+      downloadPath: config.DEFAULT_DOWNLOAD_PATH
+    }
+  }
+}

src/renderer/lib/sound.js

@@ -0,0 +1,73 @@
+module.exports = {
+  preload,
+  play
+}
+
+var config = require('../../config')
+var path = require('path')
+
+var VOLUME = 0.15
+
+/* Cache of Audio elements, for instant playback */
+var cache = {}
+
+var sounds = {
+  ADD: {
+    url: 'file://' + path.join(config.STATIC_PATH, 'sound', 'add.wav'),
+    volume: VOLUME
+  },
+  DELETE: {
+    url: 'file://' + path.join(config.STATIC_PATH, 'sound', 'delete.wav'),
+    volume: VOLUME
+  },
+  DISABLE: {
+    url: 'file://' + path.join(config.STATIC_PATH, 'sound', 'disable.wav'),
+    volume: VOLUME
+  },
+  DONE: {
+    url: 'file://' + path.join(config.STATIC_PATH, 'sound', 'done.wav'),
+    volume: VOLUME
+  },
+  ENABLE: {
+    url: 'file://' + path.join(config.STATIC_PATH, 'sound', 'enable.wav'),
+    volume: VOLUME
+  },
+  ERROR: {
+    url: 'file://' + path.join(config.STATIC_PATH, 'sound', 'error.wav'),
+    volume: VOLUME
+  },
+  PLAY: {
+    url: 'file://' + path.join(config.STATIC_PATH, 'sound', 'play.wav'),
+    volume: VOLUME
+  },
+  STARTUP: {
+    url: 'file://' + path.join(config.STATIC_PATH, 'sound', 'startup.wav'),
+    volume: VOLUME * 2
+  }
+}
+
+function preload () {
+  for (var name in sounds) {
+    if (!cache[name]) {
+      var sound = sounds[name]
+      var audio = cache[name] = new window.Audio()
+      audio.volume = sound.volume
+      audio.src = sound.url
+    }
+  }
+}
+
+function play (name) {
+  var audio = cache[name]
+  if (!audio) {
+    var sound = sounds[name]
+    if (!sound) {
+      throw new Error('Invalid sound name')
+    }
+    audio = cache[name] = new window.Audio()
+    audio.volume = sound.volume
+    audio.src = sound.url
+  }
+  audio.currentTime = 0
+  audio.play()
+}

src/renderer/lib/state.js

@@ -0,0 +1,221 @@
+var appConfig = require('application-config')('WebTorrent')
+var path = require('path')
+var {EventEmitter} = require('events')
+
+var config = require('../../config')
+var migrations = require('./migrations')
+
+var State = module.exports = Object.assign(new EventEmitter(), {
+  getDefaultPlayState,
+  load,
+  save,
+  saveThrottled
+})
+
+appConfig.filePath = path.join(config.CONFIG_PATH, 'config.json')
+
+function getDefaultState () {
+  var LocationHistory = require('location-history')
+
+  return {
+    /*
+     * Temporary state disappears once the program exits.
+     * It can contain complex objects like open connections, etc.
+     */
+    client: null, /* the WebTorrent client */
+    server: null, /* local WebTorrent-to-HTTP server */
+    prev: {}, /* used for state diffing in updateElectron() */
+    location: new LocationHistory(),
+    window: {
+      bounds: null, /* {x, y, width, height } */
+      isFocused: true,
+      isFullScreen: false,
+      title: config.APP_WINDOW_TITLE
+    },
+    selectedInfoHash: null, /* the torrent we've selected to view details. see state.torrents */
+    playing: getDefaultPlayState(), /* the media (audio or video) that we're currently playing */
+    devices: {}, /* playback devices like Chromecast and AppleTV */
+    dock: {
+      badge: 0,
+      progress: 0
+    },
+    modal: null, /* modal popover */
+    errors: [], /* user-facing errors */
+    nextTorrentKey: 1, /* identify torrents for IPC between the main and webtorrent windows */
+
+    /*
+     * Saved state is read from and written to a file every time the app runs.
+     * It should be simple and minimal and must be JSON.
+     * It must never contain absolute paths since we have a portable app.
+     *
+     * Config path:
+     *
+     * Mac                  ~/Library/Application Support/WebTorrent/config.json
+     * Linux (XDG)          $XDG_CONFIG_HOME/WebTorrent/config.json
+     * Linux (Legacy)       ~/.config/WebTorrent/config.json
+     * Windows (> Vista)    %LOCALAPPDATA%/WebTorrent/config.json
+     * Windows (XP, 2000)   %USERPROFILE%/Local Settings/Application Data/WebTorrent/config.json
+     *
+     * Also accessible via `require('application-config')('WebTorrent').filePath`
+     */
+    saved: {},
+
+    /*
+     * Getters, for convenience
+     */
+    getPlayingTorrentSummary,
+    getPlayingFileSummary
+  }
+}
+
+/* Whenever we stop playing video or audio, here's what we reset state.playing to */
+function getDefaultPlayState () {
+  return {
+    infoHash: null, /* the info hash of the torrent we're playing */
+    fileIndex: null, /* the zero-based index within the torrent */
+    location: 'local', /* 'local', 'chromecast', 'airplay' */
+    type: null, /* 'audio' or 'video', could be 'other' if ever support eg streaming to VLC */
+    currentTime: 0, /* seconds */
+    duration: 1, /* seconds */
+    isPaused: true,
+    isStalled: false,
+    lastTimeUpdate: 0, /* Unix time in ms */
+    mouseStationarySince: 0, /* Unix time in ms */
+    playbackRate: 1,
+    volume: 1,
+    subtitles: {
+      tracks: [], /* subtitle tracks, each {label, language, ...} */
+      selectedIndex: -1, /* current subtitle track */
+      showMenu: false /* popover menu, above the video */
+    },
+    aspectRatio: 0 /* aspect ratio of the video */
+  }
+}
+
+/* If the saved state file doesn't exist yet, here's what we use instead */
+function setupSavedState (cb) {
+  var fs = require('fs-extra')
+  var parseTorrent = require('parse-torrent')
+  var parallel = require('run-parallel')
+
+  var saved = {
+    prefs: {
+      downloadPath: config.DEFAULT_DOWNLOAD_PATH
+    },
+    torrents: config.DEFAULT_TORRENTS.map(createTorrentObject),
+    version: config.APP_VERSION /* make sure we can upgrade gracefully later */
+  }
+
+  var tasks = []
+
+  config.DEFAULT_TORRENTS.map(function (t, i) {
+    var infoHash = saved.torrents[i].infoHash
+    tasks.push(function (cb) {
+      fs.copy(
+        path.join(config.STATIC_PATH, t.posterFileName),
+        path.join(config.POSTER_PATH, infoHash + path.extname(t.posterFileName)),
+        cb
+      )
+    })
+    tasks.push(function (cb) {
+      fs.copy(
+        path.join(config.STATIC_PATH, t.torrentFileName),
+        path.join(config.TORRENT_PATH, infoHash + '.torrent'),
+        cb
+      )
+    })
+  })
+
+  parallel(tasks, function (err) {
+    if (err) return cb(err)
+    cb(null, saved)
+  })
+
+  function createTorrentObject (t) {
+    var torrent = fs.readFileSync(path.join(config.STATIC_PATH, t.torrentFileName))
+    var parsedTorrent = parseTorrent(torrent)
+
+    return {
+      status: 'paused',
+      infoHash: parsedTorrent.infoHash,
+      name: t.name,
+      displayName: t.name,
+      posterFileName: parsedTorrent.infoHash + path.extname(t.posterFileName),
+      torrentFileName: parsedTorrent.infoHash + '.torrent',
+      magnetURI: parseTorrent.toMagnetURI(parsedTorrent),
+      files: parsedTorrent.files,
+      selections: parsedTorrent.files.map((x) => true)
+    }
+  }
+}
+
+function getPlayingTorrentSummary () {
+  var infoHash = this.playing.infoHash
+  return this.saved.torrents.find((x) => x.infoHash === infoHash)
+}
+
+function getPlayingFileSummary () {
+  var torrentSummary = this.getPlayingTorrentSummary()
+  if (!torrentSummary) return null
+  return torrentSummary.files[this.playing.fileIndex]
+}
+
+function load (cb) {
+  var state = getDefaultState()
+
+  appConfig.read(function (err, saved) {
+    if (err || !saved.version) {
+      console.log('Missing config file: Creating new one')
+      setupSavedState(onSaved)
+    } else {
+      onSaved(null, saved)
+    }
+  })
+
+  function onSaved (err, saved) {
+    if (err) return cb(err)
+    state.saved = saved
+    migrations.run(state)
+    cb(null, state)
+  }
+}
+
+// Write state.saved to the JSON state file
+function save (state, cb) {
+  console.log('Saving state to ' + appConfig.filePath)
+  delete state.saveStateTimeout
+
+  // Clean up, so that we're not saving any pending state
+  var copy = Object.assign({}, state.saved)
+  // Remove torrents pending addition to the list, where we haven't finished
+  // reading the torrent file or file(s) to seed & don't have an infohash
+  copy.torrents = copy.torrents
+    .filter((x) => x.infoHash)
+    .map(function (x) {
+      var torrent = {}
+      for (var key in x) {
+        if (key === 'progress' || key === 'torrentKey') {
+          continue // Don't save progress info or key for the webtorrent process
+        }
+        if (key === 'playStatus') {
+          continue // Don't save whether a torrent is playing / pending
+        }
+        torrent[key] = x[key]
+      }
+      return torrent
+    })
+
+  appConfig.write(copy, (err) => {
+    if (err) console.error(err)
+    else State.emit('savedState')
+  })
+}
+
+// Write, but no more than once a second
+function saveThrottled (state) {
+  if (state.saveStateTimeout) return
+  state.saveStateTimeout = setTimeout(function () {
+    if (!state.saveStateTimeout) return
+    save(state)
+  }, 1000)
+}

src/renderer/lib/telemetry.js

@@ -0,0 +1,152 @@
+// Collects anonymous usage stats and uncaught errors
+// Reports back so that we can improve WebTorrent Desktop
+module.exports = {
+  init,
+  logUncaughtError,
+  logPlayAttempt
+}
+
+const crypto = require('crypto')
+const electron = require('electron')
+const https = require('https')
+const os = require('os')
+const url = require('url')
+
+const config = require('../../config')
+
+var telemetry
+
+function init (state) {
+  telemetry = state.saved.telemetry
+  if (!telemetry) {
+    telemetry = state.saved.telemetry = createSummary()
+    reset()
+  }
+
+  var now = new Date()
+  telemetry.timestamp = now.toISOString()
+  telemetry.localTime = now.toTimeString()
+  telemetry.screens = getScreenInfo()
+  telemetry.system = getSystemInfo()
+  telemetry.approxNumTorrents = getApproxNumTorrents(state)
+
+  if (config.IS_PRODUCTION) {
+    postToServer()
+  } else {
+    // Development: telemetry used only for local debugging
+    // Empty uncaught errors, etc at the start of every run
+    reset()
+  }
+}
+
+function reset () {
+  telemetry.uncaughtErrors = []
+  telemetry.playAttempts = {
+    total: 0,
+    success: 0,
+    timeout: 0,
+    error: 0,
+    abandoned: 0
+  }
+}
+
+function postToServer () {
+  // Serialize the telemetry summary
+  var payload = new Buffer(JSON.stringify(telemetry), 'utf8')
+
+  // POST to our server
+  var options = url.parse(config.TELEMETRY_URL)
+  options.method = 'POST'
+  options.headers = {
+    'Content-Type': 'application/json',
+    'Content-Length': payload.length
+  }
+
+  var req = https.request(options, function (res) {
+    if (res.statusCode === 200) {
+      console.log('Successfully posted telemetry summary')
+      reset()
+    } else {
+      console.error('Couldn\'t post telemetry summary, got HTTP ' + res.statusCode)
+    }
+  })
+  req.on('error', function (e) {
+    console.error('Couldn\'t post telemetry summary', e)
+  })
+  req.write(payload)
+  req.end()
+}
+
+// Creates a new telemetry summary. Gives the user a unique ID,
+// collects screen resolution, etc
+function createSummary () {
+  // Make a 256-bit random unique ID
+  var userID = crypto.randomBytes(32).toString('hex')
+  return { userID }
+}
+
+// Track screen resolution
+function getScreenInfo () {
+  return electron.screen.getAllDisplays().map((screen) => ({
+    width: screen.size.width,
+    height: screen.size.height,
+    scaleFactor: screen.scaleFactor
+  }))
+}
+
+// Track basic system info like OS version and amount of RAM
+function getSystemInfo () {
+  return {
+    osPlatform: process.platform,
+    osRelease: os.type() + ' ' + os.release(),
+    architecture: os.arch(),
+    totalMemoryMB: os.totalmem() / (1 << 20),
+    numCores: os.cpus().length
+  }
+}
+
+// Get the number of torrents, rounded to the nearest power of two
+function getApproxNumTorrents (state) {
+  var exactNum = state.saved.torrents.length
+  if (exactNum === 0) return 0
+  // Otherwise, return 1, 2, 4, 8, etc by rounding in log space
+  var log2 = Math.log(exactNum) / Math.log(2)
+  return 1 << Math.round(log2)
+}
+
+// An uncaught error happened in the main process or in one of the windows
+function logUncaughtError (procName, err) {
+  console.error('uncaught error', procName, err)
+
+  // Not initialized yet? Ignore.
+  // Hopefully uncaught errors immediately on startup are fixed in dev
+  if (!telemetry) return
+
+  var message, stack
+  if (err instanceof Error) {
+    message = err.message
+    stack = err.stack
+  } else {
+    message = String(err)
+    stack = ''
+  }
+
+  // We need to POST the telemetry object, make sure it stays < 100kb
+  if (telemetry.uncaughtErrors.length > 20) return
+  if (message.length > 1000) message = message.substring(0, 1000)
+  if (stack.length > 1000) stack = stack.substring(0, 1000)
+
+  telemetry.uncaughtErrors.push({process: procName, message, stack})
+}
+
+// The user pressed play. It either worked, timed out, or showed the
+// 'Play in VLC' codec error
+function logPlayAttempt (result) {
+  if (!['success', 'timeout', 'error', 'abandoned'].includes(result)) {
+    return console.error('Unknown play attempt result', result)
+  }
+
+  var attempts = telemetry.playAttempts
+  attempts.total = (attempts.total || 0) + 1
+  attempts[result] = (attempts[result] || 0) + 1
+}

src/renderer/lib/torrent-player.js

@@ -0,0 +1,83 @@
+module.exports = {
+  isPlayable,
+  isVideo,
+  isAudio,
+  isTorrent,
+  isPlayableTorrentSummary,
+  pickFileToPlay
+}
+
+var path = require('path')
+
+// Checks whether a fileSummary or file path is audio/video that we can play,
+// based on the file extension
+function isPlayable (file) {
+  return isVideo(file) || isAudio(file)
+}
+
+// Checks whether a fileSummary or file path is playable video
+function isVideo (file) {
+  return [
+    '.avi',
+    '.m4v',
+    '.mkv',
+    '.mov',
+    '.mp4',
+    '.mpg',
+    '.ogv',
+    '.webm',
+    '.wmv'
+  ].includes(getFileExtension(file))
+}
+
+// Checks whether a fileSummary or file path is playable audio
+function isAudio (file) {
+  return [
+    '.aac',
+    '.ac3',
+    '.mp3',
+    '.ogg',
+    '.wav'
+  ].includes(getFileExtension(file))
+}
+
+// Checks if the argument is either:
+// - a string that's a valid filename ending in .torrent
+// - a file object where obj.name is ends in .torrent
+// - a string that's a magnet link (magnet://...)
+function isTorrent (file) {
+  var isTorrentFile = getFileExtension(file) === '.torrent'
+  var isMagnet = typeof file === 'string' && /^(stream-)?magnet:/.test(file)
+  return isTorrentFile || isMagnet
+}
+
+function getFileExtension (file) {
+  var name = typeof file === 'string' ? file : file.name
+  return path.extname(name).toLowerCase()
+}
+
+function isPlayableTorrentSummary (torrentSummary) {
+  return torrentSummary.files && torrentSummary.files.some(isPlayable)
+}
+
+// Picks the default file to play from a list of torrent or torrentSummary files
+// Returns an index or undefined, if no files are playable
+function pickFileToPlay (files) {
+  // first, try to find the biggest video file
+  var videoFiles = files.filter(isVideo)
+  if (videoFiles.length > 0) {
+    var largestVideoFile = videoFiles.reduce(function (a, b) {
+      return a.length > b.length ? a : b
+    })
+    return files.indexOf(largestVideoFile)
+  }
+
+  // if there are no videos, play the first audio file
+  var audioFiles = files.filter(isAudio)
+  if (audioFiles.length > 0) {
+    return files.indexOf(audioFiles[0])
+  }
+
+  // no video or audio means nothing is playable
+  return undefined
+}

src/renderer/lib/torrent-poster.js

@@ -0,0 +1,83 @@
+module.exports = torrentPoster
+
+var captureVideoFrame = require('./capture-video-frame')
+var path = require('path')
+
+function torrentPoster (torrent, cb) {
+  // First, try to use a poster image if available
+  var posterFile = torrent.files.filter(function (file) {
+    return /^poster\.(jpg|png|gif)$/.test(file.name)
+  })[0]
+  if (posterFile) return torrentPosterFromImage(posterFile, torrent, cb)
+
+  // Second, try to use the largest video file
+  // Filter out file formats that the <video> tag definitely can't play
+  var videoFile = getLargestFileByExtension(torrent, ['.mp4', '.m4v', '.webm', '.mov', '.mkv'])
+  if (videoFile) return torrentPosterFromVideo(videoFile, torrent, cb)
+
+  // Third, try to use the largest image file
+  var imgFile = getLargestFileByExtension(torrent, ['.gif', '.jpg', '.jpeg', '.png'])
+  if (imgFile) return torrentPosterFromImage(imgFile, torrent, cb)
+
+  // TODO: generate a waveform from the largest sound file
+  // Finally, admit defeat
+  return cb(new Error('Cannot generate a poster from any files in the torrent'))
+}
+
+function getLargestFileByExtension (torrent, extensions) {
+  var files = torrent.files.filter(function (file) {
+    var extname = path.extname(file.name).toLowerCase()
+    return extensions.indexOf(extname) !== -1
+  })
+  if (files.length === 0) return undefined
+  return files.reduce(function (a, b) {
+    return a.length > b.length ? a : b
+  })
+}
+
+function torrentPosterFromVideo (file, torrent, cb) {
+  var index = torrent.files.indexOf(file)
+
+  var server = torrent.createServer(0)
+  server.listen(0, onListening)
+
+  function onListening () {
+    var port = server.address().port
+    var url = 'http://localhost:' + port + '/' + index
+    var video = document.createElement('video')
+    video.addEventListener('canplay', onCanPlay)
+
+    video.volume = 0
+    video.src = url
+    video.play()
+
+    function onCanPlay () {
+      video.removeEventListener('canplay', onCanPlay)
+      video.addEventListener('seeked', onSeeked)
+
+      video.currentTime = Math.min((video.duration || 600) * 0.03, 60)
+    }
+
+    function onSeeked () {
+      video.removeEventListener('seeked', onSeeked)
+
+      var buf = captureVideoFrame(video)
+
+      // unload video element
+      video.pause()
+      video.src = ''
+      video.load()
+
+      server.destroy()
+
+      if (buf.length === 0) return cb(new Error('Generated poster contains no data'))
+
+      cb(null, buf, '.jpg')
+    }
+  }
+}
+
+function torrentPosterFromImage (file, torrent, cb) {
+  var extname = path.extname(file.name)
+  file.getBuffer((err, buf) => cb(err, buf, extname))
+}

src/renderer/lib/torrent-summary.js

@@ -0,0 +1,56 @@
+module.exports = {
+  getPosterPath,
+  getTorrentPath,
+  getByKey,
+  getTorrentID,
+  getFileOrFolder
+}
+
+var path = require('path')
+var config = require('../../config')
+
+// Expects a torrentSummary
+// Returns an absolute path to the torrent file, or null if unavailable
+function getTorrentPath (torrentSummary) {
+  if (!torrentSummary || !torrentSummary.torrentFileName) return null
+  return path.join(config.TORRENT_PATH, torrentSummary.torrentFileName)
+}
+
+// Expects a torrentSummary
+// Returns an absolute path to the poster image, or null if unavailable
+function getPosterPath (torrentSummary) {
+  if (!torrentSummary || !torrentSummary.posterFileName) return null
+  var posterPath = path.join(config.POSTER_PATH, torrentSummary.posterFileName)
+  // Work around a Chrome bug (reproduced in vanilla Chrome, not just Electron):
+  // Backslashes in URLS in CSS cause bizarre string encoding issues
+  return posterPath.replace(/\\/g, '/')
+}
+
+// Expects a torrentSummary
+// Returns a torrentID: filename, magnet URI, or infohash
+function getTorrentID (torrentSummary) {
+  var s = torrentSummary
+  if (s.torrentFileName) { // Load torrent file from disk
+    return getTorrentPath(s)
+  } else { // Load torrent from DHT
+    return s.magnetURI || s.infoHash
+  }
+}
+
+// Expects a torrentKey or infoHash
+// Returns the corresponding torrentSummary, or undefined
+function getByKey (state, torrentKey) {
+  if (!torrentKey) return undefined
+  return state.saved.torrents.find((x) =>
+    x.torrentKey === torrentKey || x.infoHash === torrentKey)
+}
+
+// Returns the path to either the file (in a single-file torrent) or the root
+// folder (in  multi-file torrent)
+// WARNING: assumes that multi-file torrents consist of a SINGLE folder.
+// TODO: make this assumption explicit, enforce it in the `create-torrent`
+// module. Store root folder explicitly to avoid hacky path processing below.
+function getFileOrFolder (torrentSummary) {
+  var ts = torrentSummary
+  return path.join(ts.path, ts.files[0].path.split('/')[0])
+}

src/renderer/main.js

@@ -0,0 +1,431 @@
+console.time('init')
+
+const crashReporter = require('../crash-reporter')
+crashReporter.init()
+
+const dragDrop = require('drag-drop')
+const electron = require('electron')
+const React = require('react')
+const ReactDOM = require('react-dom')
+
+const config = require('../config')
+const App = require('./views/app')
+const telemetry = require('./lib/telemetry')
+const sound = require('./lib/sound')
+const State = require('./lib/state')
+const TorrentPlayer = require('./lib/torrent-player')
+
+const MediaController = require('./controllers/media-controller')
+const UpdateController = require('./controllers/update-controller')
+const PrefsController = require('./controllers/prefs-controller')
+const PlaybackController = require('./controllers/playback-controller')
+const SubtitlesController = require('./controllers/subtitles-controller')
+const TorrentListController = require('./controllers/torrent-list-controller')
+const TorrentController = require('./controllers/torrent-controller')
+
+// Yo-yo pattern: state object lives here and percolates down thru all the views.
+// Events come back up from the views via dispatch(...)
+require('./lib/dispatcher').setDispatch(dispatch)
+
+// From dispatch(...), events are sent to one of the controllers
+var controllers = null
+
+// This dependency is the slowest-loading, so we lazy load it
+var Cast = null
+
+// Electron apps have two processes: a main process (node) runs first and starts
+// a renderer process (essentially a Chrome window). We're in the renderer process,
+// and this IPC channel receives from and sends messages to the main process
+var ipcRenderer = electron.ipcRenderer
+
+// All state lives in state.js. `state.saved` is read from and written to a file.
+// All other state is ephemeral. First we load state.saved then initialize the app.
+var state
+
+// Root React component
+var app
+
+State.load(onState)
+
+// Called once when the application loads. (Not once per window.)
+// Connects to the torrent networks, sets up the UI and OS integrations like
+// the dock icon and drag+drop.
+function onState (err, _state) {
+  if (err) return onError(err)
+  state = window.state = _state // Make available for easier debugging
+
+  // Create controllers
+  controllers = {
+    media: new MediaController(state),
+    update: new UpdateController(state),
+    prefs: new PrefsController(state, config),
+    playback: new PlaybackController(state, config, update),
+    subtitles: new SubtitlesController(state),
+    torrentList: new TorrentListController(state),
+    torrent: new TorrentController(state)
+  }
+
+  // Add first page to location history
+  state.location.go({
+    url: 'home',
+    setup: (cb) => {
+      state.window.title = config.APP_WINDOW_TITLE
+      cb(null)
+    }
+  })
+
+  // Restart everything we were torrenting last time the app ran
+  resumeTorrents()
+
+  // Lazy-load other stuff, like the AppleTV module, later to keep startup fast
+  window.setTimeout(delayedInit, config.DELAYED_INIT)
+
+  // Listen for messages from the main process
+  setupIpc()
+
+  // Calling update() updates the UI given the current state
+  // Do this at least once a second to give every file in every torrentSummary
+  // a progress bar and to keep the cursor in sync when playing a video
+  setInterval(update, 1000)
+  app = ReactDOM.render(<App state={state} />, document.querySelector('#body'))
+
+  // OS integrations:
+  // ...drag and drop a torrent or video file to play or seed
+  dragDrop('body', onOpen)
+
+  // ...same thing if you paste a torrent
+  document.addEventListener('paste', onPaste)
+
+  // ...focus and blur. Needed to show correct dock icon text ('badge') in OSX
+  window.addEventListener('focus', onFocus)
+  window.addEventListener('blur', onBlur)
+
+  // ...window visibility state.
+  document.addEventListener('webkitvisibilitychange', onVisibilityChange)
+
+  // Log uncaught JS errors
+  window.addEventListener('error',
+    (e) => telemetry.logUncaughtError('window', e.error || e.target), true)
+
+  // Done! Ideally we want to get here < 500ms after the user clicks the app
+  sound.play('STARTUP')
+  console.timeEnd('init')
+}
+
+// Runs a few seconds after the app loads, to avoid slowing down startup time
+function delayedInit () {
+  lazyLoadCast()
+  sound.preload()
+  telemetry.init(state)
+}
+
+// Lazily loads Chromecast and Airplay support
+function lazyLoadCast () {
+  if (!Cast) {
+    Cast = require('./lib/cast')
+    Cast.init(state, update) // Search the local network for Chromecast and Airplays
+  }
+  return Cast
+}
+
+// React loop:
+// 1. update() - recompute the virtual DOM, diff, apply to the real DOM
+// 2. event - might be a click or other DOM event, or something external
+// 3. dispatch - the event handler calls dispatch(), main.js sends it to a controller
+// 4. controller - the controller handles the event, changing the state object
+function update () {
+  controllers.playback.showOrHidePlayerControls()
+  app.setState(state)
+  updateElectron()
+}
+
+// Some state changes can't be reflected in the DOM, instead we have to
+// tell the main process to update the window or OS integrations
+function updateElectron () {
+  if (state.window.title !== state.prev.title) {
+    state.prev.title = state.window.title
+    ipcRenderer.send('setTitle', state.window.title)
+  }
+  if (state.dock.progress !== state.prev.progress) {
+    state.prev.progress = state.dock.progress
+    ipcRenderer.send('setProgress', state.dock.progress)
+  }
+  if (state.dock.badge !== state.prev.badge) {
+    state.prev.badge = state.dock.badge
+    ipcRenderer.send('setBadge', state.dock.badge || 0)
+  }
+}
+
+const dispatchHandlers = {
+  // Torrent list: creating, deleting, selecting torrents
+  'openTorrentFile': () => ipcRenderer.send('openTorrentFile'),
+  'openFiles': () => ipcRenderer.send('openFiles'), /* shows the open file dialog */
+  'openTorrentAddress': () => { state.modal = { id: 'open-torrent-address-modal' } },
+
+  'addTorrent': (torrentId) => controllers.torrentList.addTorrent(torrentId),
+  'showCreateTorrent': (paths) => controllers.torrentList.showCreateTorrent(paths),
+  'toggleCreateTorrentAdvanced': () => controllers.torrentList.toggleCreateTorrentAdvanced(),
+  'createTorrent': (options) => controllers.torrentList.createTorrent(options),
+  'toggleTorrent': (infoHash) => controllers.torrentList.toggleTorrent(infoHash),
+  'toggleTorrentFile': (infoHash, index) => controllers.torrentList.toggleTorrentFile(infoHash, index),
+  'confirmDeleteTorrent': (infoHash, deleteData) => controllers.torrentList.confirmDeleteTorrent(infoHash, deleteData),
+  'deleteTorrent': (infoHash, deleteData) => controllers.torrentList.deleteTorrent(infoHash, deleteData),
+  'toggleSelectTorrent': (infoHash) => controllers.torrentList.toggleSelectTorrent(infoHash),
+  'openTorrentContextMenu': (infoHash) => controllers.torrentList.openTorrentContextMenu(infoHash),
+  'startTorrentingSummary': (torrentSummary) =>
+    controllers.torrentList.startTorrentingSummary(torrentSummary),
+
+  // Playback
+  'playFile': (infoHash, index) => controllers.playback.playFile(infoHash, index),
+  'playPause': () => controllers.playback.playPause(),
+  'skip': (time) => controllers.playback.skip(time),
+  'skipTo': (time) => controllers.playback.skipTo(time),
+  'changePlaybackRate': (dir) => controllers.playback.changePlaybackRate(dir),
+  'changeVolume': (delta) => controllers.playback.changeVolume(delta),
+  'setVolume': (vol) => controllers.playback.setVolume(vol),
+  'openItem': (infoHash, index) => controllers.playback.openItem(infoHash, index),
+
+  // Subtitles
+  'openSubtitles': () => controllers.subtitles.openSubtitles(),
+  'selectSubtitle': (index) => controllers.subtitles.selectSubtitle(index),
+  'toggleSubtitlesMenu': () => controllers.subtitles.toggleSubtitlesMenu(),
+  'checkForSubtitles': () => controllers.subtitles.checkForSubtitles(),
+  'addSubtitles': (files, autoSelect) => controllers.subtitles.addSubtitles(files, autoSelect),
+
+  // Local media: <video>, <audio>, VLC
+  'mediaStalled': () => controllers.media.mediaStalled(),
+  'mediaError': (err) => controllers.media.mediaError(err),
+  'mediaSuccess': () => controllers.media.mediaSuccess(),
+  'mediaTimeUpdate': () => controllers.media.mediaTimeUpdate(),
+  'mediaMouseMoved': () => controllers.media.mediaMouseMoved(),
+  'vlcPlay': () => controllers.media.vlcPlay(),
+  'vlcNotFound': () => controllers.media.vlcNotFound(),
+
+  // Remote casting: Chromecast, Airplay, etc
+  'toggleCastMenu': (deviceType) => lazyLoadCast().toggleMenu(deviceType),
+  'selectCastDevice': (index) => lazyLoadCast().selectDevice(index),
+  'stopCasting': () => lazyLoadCast().stop(),
+
+  // Preferences screen
+  'preferences': () => controllers.prefs.show(),
+  'updatePreferences': (key, value) => controllers.prefs.update(key, value),
+
+  // Update (check for new versions on Linux, where there's no auto updater)
+  'updateAvailable': (version) => controllers.update.updateAvailable(version),
+  'skipVersion': (version) => controllers.update.skipVersion(version),
+
+  // Navigation between screens (back, forward, ESC, etc)
+  'exitModal': () => { state.modal = null },
+  'backToList': backToList,
+  'escapeBack': escapeBack,
+  'back': () => state.location.back(),
+  'forward': () => state.location.forward(),
+
+  // Controlling the window
+  'setDimensions': setDimensions,
+  'toggleFullScreen': (setTo) => ipcRenderer.send('toggleFullScreen', setTo),
+  'setTitle': (title) => { state.window.title = title },
+  'resetTitle': () => { state.window.title = config.APP_WINDOW_TITLE },
+
+  // Everything else
+  'onOpen': onOpen,
+  'error': onError,
+  'uncaughtError': (proc, err) => telemetry.logUncaughtError(proc, err),
+  'saveState': () => State.save(state),
+  'saveStateThrottled': () => State.saveThrottled(state),
+  'update': () => {} // No-op, just trigger an update
+}
+
+// Events from the UI never modify state directly. Instead they call dispatch()
+function dispatch (action, ...args) {
+  // Log dispatch calls, for debugging, but don't spam
+  if (!['mediaMouseMoved', 'mediaTimeUpdate', 'update'].includes(action)) {
+    console.log('dispatch: %s %o', action, args)
+  }
+
+  var handler = dispatchHandlers[action]
+  if (handler) handler(...args)
+  else console.error('Missing dispatch handler: ' + action)
+
+  // Update the virtual DOM, unless it's just a mouse move event
+  if (action !== 'mediaMouseMoved' ||
+      controllers.playback.showOrHidePlayerControls()) {
+    update()
+  }
+}
+
+// Listen to events from the main and webtorrent processes
+function setupIpc () {
+  ipcRenderer.on('log', (e, ...args) => console.log(...args))
+  ipcRenderer.on('error', (e, ...args) => console.error(...args))
+
+  ipcRenderer.on('dispatch', (e, ...args) => dispatch(...args))
+
+  ipcRenderer.on('fullscreenChanged', onFullscreenChanged)
+
+  var tc = controllers.torrent
+  ipcRenderer.on('wt-infohash', (e, ...args) => tc.torrentInfoHash(...args))
+  ipcRenderer.on('wt-metadata', (e, ...args) => tc.torrentMetadata(...args))
+  ipcRenderer.on('wt-done', (e, ...args) => tc.torrentDone(...args))
+  ipcRenderer.on('wt-warning', (e, ...args) => tc.torrentWarning(...args))
+  ipcRenderer.on('wt-error', (e, ...args) => tc.torrentError(...args))
+
+  ipcRenderer.on('wt-progress', (e, ...args) => tc.torrentProgress(...args))
+  ipcRenderer.on('wt-file-modtimes', (e, ...args) => tc.torrentFileModtimes(...args))
+  ipcRenderer.on('wt-file-saved', (e, ...args) => tc.torrentFileSaved(...args))
+  ipcRenderer.on('wt-poster', (e, ...args) => tc.torrentPosterSaved(...args))
+  ipcRenderer.on('wt-audio-metadata', (e, ...args) => tc.torrentAudioMetadata(...args))
+  ipcRenderer.on('wt-server-running', (e, ...args) => tc.torrentServerRunning(...args))
+
+  ipcRenderer.on('wt-uncaught-error', (e, err) => telemetry.logUncaughtError('webtorrent', err))
+
+  ipcRenderer.send('ipcReady')
+
+  State.on('savedState', () => ipcRenderer.send('savedState'))
+}
+
+// Quits any modal popovers and returns to the torrent list screen
+function backToList () {
+  // Exit any modals and screens with a back button
+  state.modal = null
+  state.location.backToFirst(function () {
+    // If we were already on the torrent list, scroll to the top
+    var contentTag = document.querySelector('.content')
+    if (contentTag) contentTag.scrollTop = 0
+  })
+}
+
+// Quits modals, full screen, or goes back. Happens when the user hits ESC
+function escapeBack () {
+  if (state.modal) {
+    dispatch('exitModal')
+  } else if (state.window.isFullScreen) {
+    dispatch('toggleFullScreen')
+  } else {
+    dispatch('back')
+  }
+}
+
+// Starts all torrents that aren't paused on program startup
+function resumeTorrents () {
+  state.saved.torrents
+    .filter((torrentSummary) => torrentSummary.status !== 'paused')
+    .forEach((torrentSummary) => controllers.torrentList.startTorrentingSummary(torrentSummary))
+}
+
+// Set window dimensions to match video dimensions or fill the screen
+function setDimensions (dimensions) {
+  // Don't modify the window size if it's already maximized
+  if (electron.remote.getCurrentWindow().isMaximized()) {
+    state.window.bounds = null
+    return
+  }
+
+  // Save the bounds of the window for later. See restoreBounds()
+  state.window.bounds = {
+    x: window.screenX,
+    y: window.screenY,
+    width: window.outerWidth,
+    height: window.outerHeight
+  }
+  state.window.wasMaximized = electron.remote.getCurrentWindow().isMaximized
+
+  // Limit window size to screen size
+  var screenWidth = window.screen.width
+  var screenHeight = window.screen.height
+  var aspectRatio = dimensions.width / dimensions.height
+  var scaleFactor = Math.min(
+    Math.min(screenWidth / dimensions.width, 1),
+    Math.min(screenHeight / dimensions.height, 1)
+  )
+  var width = Math.max(
+    Math.floor(dimensions.width * scaleFactor),
+    config.WINDOW_MIN_WIDTH
+  )
+  var height = Math.max(
+    Math.floor(dimensions.height * scaleFactor),
+    config.WINDOW_MIN_HEIGHT
+  )
+
+  ipcRenderer.send('setAspectRatio', aspectRatio)
+  ipcRenderer.send('setBounds', {x: null, y: null, width, height})
+  state.playing.aspectRatio = aspectRatio
+}
+
+// Called when the user adds files (.torrent, files to seed, subtitles) to the app
+// via any method (drag-drop, drag to app icon, command line)
+function onOpen (files) {
+  if (!Array.isArray(files)) files = [ files ]
+
+  if (state.modal) {
+    state.modal = null
+  }
+
+  var subtitles = files.filter(controllers.subtitles.isSubtitle)
+
+  if (state.location.url() === 'home' || subtitles.length === 0) {
+    if (files.every(TorrentPlayer.isTorrent)) {
+      if (state.location.url() !== 'home') {
+        dispatch('backToList')
+      }
+      // All .torrent files? Add them.
+      files.forEach((file) => controllers.torrentList.addTorrent(file))
+    } else {
+      // Show the Create Torrent screen. Let's seed those files.
+      controllers.torrentList.showCreateTorrent(files)
+    }
+  } else if (state.location.url() === 'player') {
+    controllers.subtitles.addSubtitles(subtitles, true)
+  }
+
+  update()
+}
+
+function onError (err) {
+  console.error(err.stack || err)
+  sound.play('ERROR')
+  state.errors.push({
+    time: new Date().getTime(),
+    message: err.message || err
+  })
+
+  update()
+}
+
+function onPaste (e) {
+  if (e.target.tagName.toLowerCase() === 'input') return
+
+  var torrentIds = electron.clipboard.readText().split('\n')
+  torrentIds.forEach(function (torrentId) {
+    torrentId = torrentId.trim()
+    if (torrentId.length === 0) return
+    controllers.torrentList.addTorrent(torrentId)
+  })
+
+  update()
+}
+
+function onFocus (e) {
+  state.window.isFocused = true
+  state.dock.badge = 0
+  update()
+}
+
+function onBlur () {
+  state.window.isFocused = false
+  update()
+}
+
+function onVisibilityChange () {
+  state.window.isVisible = !document.webkitHidden
+}
+
+function onFullscreenChanged (e, isFullScreen) {
+  state.window.isFullScreen = isFullScreen
+  if (!isFullScreen) {
+    // Aspect ratio gets reset in fullscreen mode, so restore it (Mac)
+    ipcRenderer.send('setAspectRatio', state.playing.aspectRatio)
+  }
+
+  update()
+}

src/renderer/views/app.js

@@ -0,0 +1,97 @@
+const React = require('react')
+
+const Header = require('./header')
+
+const Views = {
+  'home': require('./torrent-list'),
+  'player': require('./player'),
+  'create-torrent': require('./create-torrent'),
+  'preferences': require('./preferences')
+}
+
+const Modals = {
+  'open-torrent-address-modal': require('./open-torrent-address-modal'),
+  'remove-torrent-modal': require('./remove-torrent-modal'),
+  'update-available-modal': require('./update-available-modal'),
+  'unsupported-media-modal': require('./unsupported-media-modal')
+}
+
+module.exports = class App extends React.Component {
+
+  constructor (props) {
+    super(props)
+    this.state = props.state
+  }
+
+  render () {
+    var state = this.state
+
+    // Hide player controls while playing video, if the mouse stays still for a while
+    // Never hide the controls when:
+    // * The mouse is over the controls or we're scrubbing (see CSS)
+    // * The video is paused
+    // * The video is playing remotely on Chromecast or Airplay
+    var hideControls = state.location.url() === 'player' &&
+      state.playing.mouseStationarySince !== 0 &&
+      new Date().getTime() - state.playing.mouseStationarySince > 2000 &&
+      !state.playing.isPaused &&
+      state.playing.location === 'local' &&
+      state.playing.playbackRate === 1
+
+    var cls = [
+      'view-' + state.location.url(), /* e.g. view-home, view-player */
+      'is-' + process.platform /* e.g. is-darwin, is-win32, is-linux */
+    ]
+    if (state.window.isFullScreen) cls.push('is-fullscreen')
+    if (state.window.isFocused) cls.push('is-focused')
+    if (hideControls) cls.push('hide-video-controls')
+
+    var vdom = (
+      <div className={'app ' + cls.join(' ')}>
+        <Header state={state} />
+        {this.getErrorPopover()}
+        <div key='content' className='content'>{this.getView()}</div>
+        {this.getModal()}
+      </div>
+    )
+
+    return vdom
+  }
+
+  getErrorPopover () {
+    var now = new Date().getTime()
+    var recentErrors = this.state.errors.filter((x) => now - x.time < 5000)
+    var hasErrors = recentErrors.length > 0
+
+    var errorElems = recentErrors.map(function (error, i) {
+      return (<div key={i} className='error'>{error.message}</div>)
+    })
+    return (
+      <div key='errors'
+        className={'error-popover ' + (hasErrors ? 'visible' : 'hidden')}>
+        <div key='title' className='title'>Error</div>
+        {errorElems}
+      </div>
+    )
+  }
+
+  getModal () {
+    var state = this.state
+    if (!state.modal) return
+    var ModalContents = Modals[state.modal.id]
+    return (
+      <div key='modal' className='modal'>
+        <div key='modal-background' className='modal-background'></div>
+        <div key='modal-content' className='modal-content'>
+          <ModalContents state={state} />
+        </div>
+      </div>
+    )
+  }
+
+  getView () {
+    var state = this.state
+    var View = Views[state.location.url()]
+    return (<View state={state} />)
+  }
+}

src/renderer/views/create-torrent-error-page.js

@@ -0,0 +1,26 @@
+const React = require('react')
+
+const {dispatcher} = require('../lib/dispatcher')
+
+module.exports = class CreateTorrentErrorPage extends React.Component {
+  render () {
+    return (
+      <div className='create-torrent'>
+        <h2>Create torrent</h2>
+        <p className='torrent-info'>
+          <p>
+            Sorry, you must select at least one file that is not a hidden file.
+          </p>
+          <p>
+            Hidden files, starting with a . character, are not included.
+          </p>
+        </p>
+        <p className='float-right'>
+          <button className='button-flat light' onClick={dispatcher('back')}>
+            Cancel
+          </button>
+        </p>
+      </div>
+    )
+  }
+}

src/renderer/views/create-torrent.js

@@ -0,0 +1,131 @@
+const React = require('react')
+const createTorrent = require('create-torrent')
+const path = require('path')
+const prettyBytes = require('prettier-bytes')
+
+const {dispatch, dispatcher} = require('../lib/dispatcher')
+const CreateTorrentErrorPage = require('./create-torrent-error-page')
+
+module.exports = class CreateTorrentPage extends React.Component {
+  render () {
+    var state = this.props.state
+    var info = state.location.current()
+
+    // Preprocess: exclude .DS_Store and other dotfiles
+    var files = info.files
+      .filter((f) => !f.name.startsWith('.'))
+      .map((f) => ({name: f.name, path: f.path, size: f.size}))
+    if (files.length === 0) return (<CreateTorrentErrorPage state={state} />)
+
+    // First, extract the base folder that the files are all in
+    var pathPrefix = info.folderPath
+    if (!pathPrefix) {
+      pathPrefix = files.map((x) => x.path).reduce(findCommonPrefix)
+      if (!pathPrefix.endsWith('/') && !pathPrefix.endsWith('\\')) {
+        pathPrefix = path.dirname(pathPrefix)
+      }
+    }
+
+    // Sanity check: show the number of files and total size
+    var numFiles = files.length
+    var totalBytes = files
+      .map((f) => f.size)
+      .reduce((a, b) => a + b, 0)
+    var torrentInfo = `${numFiles} files, ${prettyBytes(totalBytes)}`
+
+    // Then, use the name of the base folder (or sole file, for a single file torrent)
+    // as the default name. Show all files relative to the base folder.
+    var defaultName, basePath
+    if (files.length === 1) {
+      // Single file torrent: /a/b/foo.jpg -> torrent name 'foo.jpg', path '/a/b'
+      defaultName = files[0].name
+      basePath = pathPrefix
+    } else {
+      // Multi file torrent: /a/b/{foo, bar}.jpg -> torrent name 'b', path '/a'
+      defaultName = path.basename(pathPrefix)
+      basePath = path.dirname(pathPrefix)
+    }
+    var maxFileElems = 100
+    var fileElems = files.slice(0, maxFileElems).map(function (file, i) {
+      var relativePath = files.length === 0 ? file.name : path.relative(pathPrefix, file.path)
+      return (<div key={i}>{relativePath}</div>)
+    })
+    if (files.length > maxFileElems) {
+      fileElems.push(<div key='more'>+ {maxFileElems - files.length} more</div>)
+    }
+    var trackers = createTorrent.announceList.join('\n')
+    var collapsedClass = info.showAdvanced ? 'expanded' : 'collapsed'
+
+    return (
+      <div className='create-torrent'>
+        <h2>Create torrent {defaultName}</h2>
+        <div key='info' className='torrent-info'>
+          {torrentInfo}
+        </div>
+        <div key='path-prefix' className='torrent-attribute'>
+          <label>Path:</label>
+          <div className='torrent-attribute'>{pathPrefix}</div>
+        </div>
+        <div key='toggle' className={'expand-collapse ' + collapsedClass}
+          onClick={dispatcher('toggleCreateTorrentAdvanced')}>
+          {info.showAdvanced ? 'Basic' : 'Advanced'}
+        </div>
+        <div key='advanced' className={'create-torrent-advanced ' + collapsedClass}>
+          <div key='comment' className='torrent-attribute'>
+            <label>Comment:</label>
+            <textarea className='torrent-attribute torrent-comment'></textarea>
+          </div>
+          <div key='trackers' className='torrent-attribute'>
+            <label>Trackers:</label>
+            <textarea className='torrent-attribute torrent-trackers' value={trackers}></textarea>
+          </div>
+          <div key='private' className='torrent-attribute'>
+            <label>Private:</label>
+            <input type='checkbox' className='torrent-is-private' value='torrent-is-private' />
+          </div>
+          <div key='files' className='torrent-attribute'>
+            <label>Files:</label>
+            <div>{fileElems}</div>
+          </div>
+        </div>
+        <div key='buttons' className='float-right'>
+          <button key='cancel' className='button-flat light' onClick={dispatcher('back')}>Cancel</button>
+          <button key='create' className='button-raised' onClick={handleOK}>Create Torrent</button>
+        </div>
+      </div>
+    )
+
+    function handleOK () {
+      // TODO: dcposch use React refs instead
+      var announceList = document.querySelector('.torrent-trackers').value
+        .split('\n')
+        .map((s) => s.trim())
+        .filter((s) => s !== '')
+      var isPrivate = document.querySelector('.torrent-is-private').checked
+      var comment = document.querySelector('.torrent-comment').value.trim()
+      var options = {
+        // We can't let the user choose their own name if we want WebTorrent
+        // to use the files in place rather than creating a new folder.
+        // If we ever want to add support for that:
+        // name: document.querySelector('.torrent-name').value
+        name: defaultName,
+        path: basePath,
+        files: files,
+        announce: announceList,
+        private: isPrivate,
+        comment: comment
+      }
+      dispatch('createTorrent', options)
+    }
+  }
+}
+
+// Finds the longest common prefix
+function findCommonPrefix (a, b) {
+  for (var i = 0; i < a.length && i < b.length; i++) {
+    if (a.charCodeAt(i) !== b.charCodeAt(i)) break
+  }
+  if (i === a.length) return a
+  if (i === b.length) return b
+  return a.substring(0, i)
+}

src/renderer/views/header.js

@@ -0,0 +1,50 @@
+const React = require('react')
+
+const {dispatcher} = require('../lib/dispatcher')
+
+module.exports = class Header extends React.Component {
+  render () {
+    var loc = this.props.state.location
+    return (
+      <div key='header' className='header'>
+        {this.getTitle()}
+        <div className='nav left float-left'>
+          <i
+            className={'icon back ' + (loc.hasBack() ? '' : 'disabled')}
+            title='Back'
+            onClick={dispatcher('back')}>
+            chevron_left
+          </i>
+          <i
+            className={'icon forward ' + (loc.hasForward() ? '' : 'disabled')}
+            title='Forward'
+            onClick={dispatcher('forward')}>
+            chevron_right
+          </i>
+        </div>
+        <div className='nav right float-right'>
+          {this.getAddButton()}
+        </div>
+      </div>
+    )
+  }
+
+  getTitle () {
+    if (process.platform !== 'darwin') return null
+    var state = this.props.state
+    return (<div className='title ellipsis'>{state.window.title}</div>)
+  }
+
+  getAddButton () {
+    var state = this.props.state
+    if (state.location.url() !== 'home') return null
+    return (
+      <i
+        className='icon add'
+        title='Add torrent'
+        onClick={dispatcher('openFiles')}>
+        add
+      </i>
+    )
+  }
+}

src/renderer/views/open-torrent-address-modal.js

@@ -0,0 +1,32 @@
+const React = require('react')
+
+const {dispatch, dispatcher} = require('../lib/dispatcher')
+
+module.exports = class OpenTorrentAddressModal extends React.Component {
+  render () {
+    // TODO: dcposch remove janky inline <script>
+    return (
+      <div className='open-torrent-address-modal'>
+        <p><label>Enter torrent address or magnet link</label></p>
+        <p>
+          <input id='add-torrent-url' type='text' onKeyPress={handleKeyPress} />
+        </p>
+        <p className='float-right'>
+          <button className='button button-flat' onClick={dispatcher('exitModal')}>Cancel</button>
+          <button className='button button-raised' onClick={handleOK}>OK</button>
+        </p>
+        <script>document.querySelector('#add-torrent-url').focus()</script>
+      </div>
+    )
+  }
+}
+
+function handleKeyPress (e) {
+  if (e.which === 13) handleOK() /* hit Enter to submit */
+}
+
+function handleOK () {
+  dispatch('exitModal')
+  // TODO: dcposch use React refs instead
+  dispatch('addTorrent', document.querySelector('#add-torrent-url').value)
+}

src/renderer/views/player.js

@@ -0,0 +1,627 @@
+const React = require('react')
+const Bitfield = require('bitfield')
+const prettyBytes = require('prettier-bytes')
+const zeroFill = require('zero-fill')
+
+const TorrentSummary = require('../lib/torrent-summary')
+const {dispatch, dispatcher} = require('../lib/dispatcher')
+
+// Shows a streaming video player. Standard features + Chromecast + Airplay
+module.exports = class Player extends React.Component {
+  render () {
+    // Show the video as large as will fit in the window, play immediately
+    // If the video is on Chromecast or Airplay, show a title screen instead
+    var state = this.props.state
+    var showVideo = state.playing.location === 'local'
+    return (
+      <div
+        className='player'
+        onWheel={handleVolumeWheel}
+        onMouseMove={dispatcher('mediaMouseMoved')}>
+        {showVideo ? renderMedia(state) : renderCastScreen(state)}
+        {renderPlayerControls(state)}
+      </div>
+    )
+  }
+}
+
+// Handles volume change by wheel
+function handleVolumeWheel (e) {
+  dispatch('changeVolume', (-e.deltaY | e.deltaX) / 500)
+}
+
+function renderMedia (state) {
+  if (!state.server) return
+
+  // Unfortunately, play/pause can't be done just by modifying HTML.
+  // Instead, grab the DOM node and play/pause it if necessary
+  // Get the <video> or <audio> tag
+  var mediaElement = document.querySelector(state.playing.type)
+  if (mediaElement !== null) {
+    if (state.playing.isPaused && !mediaElement.paused) {
+      mediaElement.pause()
+    } else if (!state.playing.isPaused && mediaElement.paused) {
+      mediaElement.play()
+    }
+    // When the user clicks or drags on the progress bar, jump to that position
+    if (state.playing.jumpToTime != null) {
+      mediaElement.currentTime = state.playing.jumpToTime
+      state.playing.jumpToTime = null
+    }
+    if (state.playing.playbackRate !== mediaElement.playbackRate) {
+      mediaElement.playbackRate = state.playing.playbackRate
+    }
+    // Recover previous volume
+    if (state.previousVolume !== null && isFinite(state.previousVolume)) {
+      mediaElement.volume = state.previousVolume
+      state.previousVolume = null
+    }
+
+    // Set volume
+    if (state.playing.setVolume !== null && isFinite(state.playing.setVolume)) {
+      mediaElement.volume = state.playing.setVolume
+      state.playing.setVolume = null
+    }
+
+    // Switch to the newly added subtitle track, if available
+    var tracks = mediaElement.textTracks || []
+    for (var j = 0; j < tracks.length; j++) {
+      var isSelectedTrack = j === state.playing.subtitles.selectedIndex
+      tracks[j].mode = isSelectedTrack ? 'showing' : 'hidden'
+    }
+
+    // Save video position
+    var file = state.getPlayingFileSummary()
+    file.currentTime = state.playing.currentTime = mediaElement.currentTime
+    file.duration = state.playing.duration = mediaElement.duration
+
+    // Save selected subtitle
+    if (state.playing.subtitles.selectedIndex !== -1) {
+      var index = state.playing.subtitles.selectedIndex
+      file.selectedSubtitle = state.playing.subtitles.tracks[index].filePath
+    } else if (file.selectedSubtitle != null) {
+      delete file.selectedSubtitle
+    }
+
+    state.playing.volume = mediaElement.volume
+  }
+
+  // Add subtitles to the <video> tag
+  var trackTags = []
+  if (state.playing.subtitles.selectedIndex >= 0) {
+    for (var i = 0; i < state.playing.subtitles.tracks.length; i++) {
+      var track = state.playing.subtitles.tracks[i]
+      var isSelected = state.playing.subtitles.selectedIndex === i
+      trackTags.push(
+        <track
+          key={i}
+          default={isSelected ? 'default' : ''}
+          label={track.label}
+          type='subtitles'
+          src={track.buffer} />
+      )
+    }
+  }
+
+  // Create the <audio> or <video> tag
+  var MediaTagName = state.playing.type
+  var mediaTag = (
+    <MediaTagName
+      src={state.server.localURL}
+      onDoubleClick={dispatcher('toggleFullScreen')}
+      onLoadedMetadata={onLoadedMetadata}
+      onEnded={onEnded}
+      onStalled={dispatcher('mediaStalled')}
+      onError={dispatcher('mediaError')}
+      onTimeUpdate={dispatcher('mediaTimeUpdate')}
+      onEncrypted={dispatcher('mediaEncrypted')}
+      onCanPlay={onCanPlay}>
+      {trackTags}
+    </MediaTagName>
+  )
+
+  // Show the media.
+  return (
+    <div
+      key='letterbox'
+      className='letterbox'
+      onMouseMove={dispatcher('mediaMouseMoved')}>
+      {mediaTag}
+      {renderOverlay(state)}
+    </div>
+  )
+
+  // As soon as we know the video dimensions, resize the window
+  function onLoadedMetadata (e) {
+    if (state.playing.type !== 'video') return
+    var video = e.target
+    var dimensions = {
+      width: video.videoWidth,
+      height: video.videoHeight
+    }
+    dispatch('setDimensions', dimensions)
+  }
+
+  // When the video completes, pause the video instead of looping
+  function onEnded (e) {
+    state.playing.isPaused = true
+  }
+
+  function onCanPlay (e) {
+    var elem = e.target
+    if (state.playing.type === 'video' &&
+      elem.webkitVideoDecodedByteCount === 0) {
+      dispatch('mediaError', 'Video codec unsupported')
+    } else if (elem.webkitAudioDecodedByteCount === 0) {
+      dispatch('mediaError', 'Audio codec unsupported')
+    } else {
+      dispatch('mediaSuccess')
+      elem.play()
+    }
+  }
+}
+
+function renderOverlay (state) {
+  var elems = []
+  var audioMetadataElem = renderAudioMetadata(state)
+  var spinnerElem = renderLoadingSpinner(state)
+  if (audioMetadataElem) elems.push(audioMetadataElem)
+  if (spinnerElem) elems.push(spinnerElem)
+
+  // Video fills the window, centered with black bars if necessary
+  // Audio gets a static poster image and a summary of the file metadata.
+  var style
+  if (state.playing.type === 'audio') {
+    style = { backgroundImage: cssBackgroundImagePoster(state) }
+  } else if (elems.length !== 0) {
+    style = { backgroundImage: cssBackgroundImageDarkGradient() }
+  } else {
+    // Video playing, so no spinner. No overlay needed
+    return
+  }
+
+  return (
+    <div key='overlay' className='media-overlay-background' style={style}>
+      <div className='media-overlay'>{elems}</div>
+    </div>
+  )
+}
+
+function renderAudioMetadata (state) {
+  var fileSummary = state.getPlayingFileSummary()
+  if (!fileSummary.audioInfo) return
+  var info = fileSummary.audioInfo
+
+  // Get audio track info
+  var title = info.title
+  if (!title) {
+    title = fileSummary.name
+  }
+  var artist = info.artist && info.artist[0]
+  var album = info.album
+  if (album && info.year && !album.includes(info.year)) {
+    album += ' (' + info.year + ')'
+  }
+  var track
+  if (info.track && info.track.no && info.track.of) {
+    track = info.track.no + ' of ' + info.track.of
+  }
+
+  // Show a small info box in the middle of the screen with title/album/etc
+  var elems = []
+  if (artist) {
+    elems.push((
+      <div key='artist' className='audio-artist'>
+        <label>Artist</label>{artist}
+      </div>
+    ))
+  }
+  if (album) {
+    elems.push((
+      <div key='album' className='audio-album'>
+        <label>Album</label>{album}
+      </div>
+    ))
+  }
+  if (track) {
+    elems.push((
+      <div key='track' className='audio-track'>
+        <label>Track</label>{track}
+      </div>
+    ))
+  }
+
+  // Align the title with the other info, if available. Otherwise, center title
+  var emptyLabel = (<label></label>)
+  elems.unshift((
+    <div key='title' className='audio-title'>
+      {elems.length ? emptyLabel : undefined}{title}
+    </div>
+  ))
+
+  return (<div key='audio-metadata' className='audio-metadata'>{elems}</div>)
+}
+
+function renderLoadingSpinner (state) {
+  if (state.playing.isPaused) return
+  var isProbablyStalled = state.playing.isStalled ||
+    (new Date().getTime() - state.playing.lastTimeUpdate > 2000)
+  if (!isProbablyStalled) return
+
+  var prog = state.getPlayingTorrentSummary().progress || {}
+  var fileProgress = 0
+  if (prog.files) {
+    var file = prog.files[state.playing.fileIndex]
+    fileProgress = Math.floor(100 * file.numPiecesPresent / file.numPieces)
+  }
+
+  return (
+    <div key='loading' className='media-stalled'>
+      <div key='loading-spinner' className='loading-spinner'>&nbsp;</div>
+      <div key='loading-progress' className='loading-status ellipsis'>
+        <span className='progress'>{fileProgress}%</span> downloaded,
+        <span>↓ {prettyBytes(prog.downloadSpeed || 0)}/s</span>
+        <span>↑ {prettyBytes(prog.uploadSpeed || 0)}/s</span>
+      </div>
+    </div>
+  )
+}
+
+function renderCastScreen (state) {
+  var castIcon, castType, isCast
+  if (state.playing.location.startsWith('chromecast')) {
+    castIcon = 'cast_connected'
+    castType = 'Chromecast'
+    isCast = true
+  } else if (state.playing.location.startsWith('airplay')) {
+    castIcon = 'airplay'
+    castType = 'AirPlay'
+    isCast = true
+  } else if (state.playing.location.startsWith('dlna')) {
+    castIcon = 'tv'
+    castType = 'DLNA'
+    isCast = true
+  } else if (state.playing.location === 'vlc') {
+    castIcon = 'tv'
+    castType = 'VLC'
+    isCast = false
+  } else if (state.playing.location === 'error') {
+    castIcon = 'error_outline'
+    castType = 'Error'
+    isCast = false
+  }
+
+  var isStarting = state.playing.location.endsWith('-pending')
+  var castName = state.playing.castName
+  var castStatus
+  if (isCast && isStarting) castStatus = 'Connecting to ' + castName + '...'
+  else if (isCast && !isStarting) castStatus = 'Connected to ' + castName
+  else castStatus = ''
+
+  // Show a nice title image, if possible
+  var style = {
+    backgroundImage: cssBackgroundImagePoster(state)
+  }
+
+  return (
+    <div key='cast' className='letterbox' style={style}>
+      <div className='cast-screen'>
+        <i className='icon'>{castIcon}</i>
+        <div key='type' className='cast-type'>{castType}</div>
+        <div key='status' className='cast-status'>{castStatus}</div>
+      </div>
+    </div>
+  )
+}
+
+function renderCastOptions (state) {
+  if (!state.devices.castMenu) return
+
+  var {location, devices} = state.devices.castMenu
+  var player = state.devices[location]
+
+  var items = devices.map(function (device, ix) {
+    var isSelected = player.device === device
+    var name = device.name
+    return (
+      <li key={ix} onClick={dispatcher('selectCastDevice', ix)}>
+        <i className='icon'>{isSelected ? 'radio_button_checked' : 'radio_button_unchecked'}</i>
+        {name}
+      </li>
+    )
+  })
+
+  return (
+    <ul key='cast-options' className='options-list'>
+      {items}
+    </ul>
+  )
+}
+
+function renderSubtitleOptions (state) {
+  var subtitles = state.playing.subtitles
+  if (!subtitles.tracks.length || !subtitles.showMenu) return
+
+  var items = subtitles.tracks.map(function (track, ix) {
+    var isSelected = state.playing.subtitles.selectedIndex === ix
+    return (
+      <li key={ix} onClick={dispatcher('selectSubtitle', ix)}>
+        <i className='icon'>{'radio_button_' + (isSelected ? 'checked' : 'unchecked')}</i>
+        {track.label}
+      </li>
+    )
+  })
+
+  var noneSelected = state.playing.subtitles.selectedIndex === -1
+  var noneClass = 'radio_button_' + (noneSelected ? 'checked' : 'unchecked')
+  return (
+    <ul key='subtitle-options' className='options-list'>
+      {items}
+      <li onClick={dispatcher('selectSubtitle', -1)}>
+        <i className='icon'>{noneClass}</i>
+        None
+      </li>
+    </ul>
+  )
+}
+
+function renderPlayerControls (state) {
+  var positionPercent = 100 * state.playing.currentTime / state.playing.duration
+  var playbackCursorStyle = { left: 'calc(' + positionPercent + '% - 3px)' }
+  var captionsClass = state.playing.subtitles.tracks.length === 0
+    ? 'disabled'
+    : state.playing.subtitles.selectedIndex >= 0
+      ? 'active'
+      : ''
+
+  var elements = [
+    <div key='playback-bar' className='playback-bar'>
+      {renderLoadingBar(state)}
+      <div
+        key='cursor'
+        className='playback-cursor'
+        style={playbackCursorStyle}>
+      </div>
+      <div
+        key='scrub-bar'
+        className='scrub-bar'
+        draggable='true'
+        onDragStart={handleDragStart}
+        onClick={handleScrub}
+        onDrag={handleScrub}>
+      </div>
+    </div>,
+
+    <i
+      key='play'
+      className='icon play-pause float-left'
+      onClick={dispatcher('playPause')}>
+      {state.playing.isPaused ? 'play_arrow' : 'pause'}
+    </i>,
+
+    <i
+      key='fullscreen'
+      className='icon fullscreen float-right'
+      onClick={dispatcher('toggleFullScreen')}>
+      {state.window.isFullScreen ? 'fullscreen_exit' : 'fullscreen'}
+    </i>
+  ]
+
+  if (state.playing.type === 'video') {
+    // show closed captions icon
+    elements.push((
+      <i
+        key='subtitles'
+        className={'icon closed-caption float-right ' + captionsClass}
+        onClick={handleSubtitles}>
+        closed_caption
+      </i>
+    ))
+  }
+
+  // If we've detected a Chromecast or AppleTV, the user can play video there
+  var castTypes = ['chromecast', 'airplay', 'dlna']
+  var isCastingAnywhere = castTypes.some(
+    (castType) => state.playing.location.startsWith(castType))
+
+  // Add the cast buttons. Icons for each cast type, connected/disconnected:
+  var buttonIcons = {
+    'chromecast': {true: 'cast_connected', false: 'cast'},
+    'airplay': {true: 'airplay', false: 'airplay'},
+    'dlna': {true: 'tv', false: 'tv'}
+  }
+  castTypes.forEach(function (castType) {
+    // Do we show this button (eg. the Chromecast button) at all?
+    var isCasting = state.playing.location.startsWith(castType)
+    var player = state.devices[castType]
+    if ((!player || player.getDevices().length === 0) && !isCasting) return
+
+    // Show the button. Three options for eg the Chromecast button:
+    var buttonClass, buttonHandler
+    if (isCasting) {
+      // Option 1: we are currently connected to Chromecast. Button stops the cast.
+      buttonClass = 'active'
+      buttonHandler = dispatcher('stopCasting')
+    } else if (isCastingAnywhere) {
+      // Option 2: we are currently connected somewhere else. Button disabled.
+      buttonClass = 'disabled'
+      buttonHandler = undefined
+    } else {
+      // Option 3: we are not connected anywhere. Button opens Chromecast menu.
+      buttonClass = ''
+      buttonHandler = dispatcher('toggleCastMenu', castType)
+    }
+    var buttonIcon = buttonIcons[castType][isCasting]
+
+    elements.push((
+      <i
+        key={castType}
+        className={'icon device float-right ' + buttonClass}
+        onClick={buttonHandler}>
+        {buttonIcon}
+      </i>
+    ))
+  })
+
+  // Render volume slider
+  var volume = state.playing.volume
+  var volumeIcon = 'volume_' + (
+    volume === 0 ? 'off'
+    : volume < 0.3 ? 'mute'
+    : volume < 0.6 ? 'down'
+    : 'up')
+  var volumeStyle = {
+    background: '-webkit-gradient(linear, left top, right top, ' +
+      'color-stop(' + (volume * 100) + '%, #eee), ' +
+      'color-stop(' + (volume * 100) + '%, #727272))'
+  }
+
+  // TODO: dcposch change the range input to use value / onChanged instead of
+  // "readonly" / onMouse[Down,Move,Up]
+  elements.push((
+    <div key='volume' className='volume float-left'>
+      <i
+        className='icon volume-icon float-left'
+        onMouseDown={handleVolumeMute}>
+        {volumeIcon}
+      </i>
+      <input
+        className='volume-slider float-right'
+        type='range' min='0' max='1' step='0.05'
+        value={volume}
+        onChange={handleVolumeScrub}
+        style={volumeStyle}
+      />
+    </div>
+  ))
+
+  // Show video playback progress
+  var currentTimeStr = formatTime(state.playing.currentTime)
+  var durationStr = formatTime(state.playing.duration)
+  elements.push((
+    <span key='time' className='time float-left'>
+      {currentTimeStr} / {durationStr}
+    </span>
+  ))
+
+  // render playback rate
+  if (state.playing.playbackRate !== 1) {
+    elements.push((
+      <span key='rate' className='rate float-left'>
+        {state.playing.playbackRate}x
+      </span>
+    ))
+  }
+
+  return (
+    <div key='controls' className='controls'>
+      {elements}
+      {renderCastOptions(state)}
+      {renderSubtitleOptions(state)}
+    </div>
+  )
+
+  function handleDragStart (e) {
+    // Prevent the cursor from changing, eg to a green + icon on Mac
+    if (e.dataTransfer) {
+      var dt = e.dataTransfer
+      dt.effectAllowed = 'none'
+    }
+  }
+
+  // Handles a click or drag to scrub (jump to another position in the video)
+  function handleScrub (e) {
+    if (!e.clientX) return
+    dispatch('mediaMouseMoved')
+    var windowWidth = document.querySelector('body').clientWidth
+    var fraction = e.clientX / windowWidth
+    var position = fraction * state.playing.duration /* seconds */
+    dispatch('skipTo', position)
+  }
+
+  // Handles volume muting and Unmuting
+  function handleVolumeMute (e) {
+    if (state.playing.volume === 0.0) {
+      dispatch('setVolume', 1.0)
+    } else {
+      dispatch('setVolume', 0.0)
+    }
+  }
+
+  // Handles volume slider scrub
+  function handleVolumeScrub (e) {
+    dispatch('setVolume', e.target.value)
+  }
+
+  function handleSubtitles (e) {
+    if (!state.playing.subtitles.tracks.length || e.ctrlKey || e.metaKey) {
+      // if no subtitles available select it
+      dispatch('openSubtitles')
+    } else {
+      dispatch('toggleSubtitlesMenu')
+    }
+  }
+}
+
+// Renders the loading bar. Shows which parts of the torrent are loaded, which
+// can be 'spongey' / non-contiguous
+function renderLoadingBar (state) {
+  var torrentSummary = state.getPlayingTorrentSummary()
+  if (!torrentSummary.progress) {
+    return []
+  }
+
+  // Find all contiguous parts of the torrent which are loaded
+  var prog = torrentSummary.progress
+  var fileProg = prog.files[state.playing.fileIndex]
+  var parts = []
+  var lastPiecePresent = false
+  for (var i = fileProg.startPiece; i <= fileProg.endPiece; i++) {
+    var partPresent = Bitfield.prototype.get.call(prog.bitfield, i)
+    if (partPresent && !lastPiecePresent) {
+      parts.push({start: i - fileProg.startPiece, count: 1})
+    } else if (partPresent) {
+      parts[parts.length - 1].count++
+    }
+    lastPiecePresent = partPresent
+  }
+
+  // Output some bars to show which parts of the file are loaded
+  var loadingBarElems = parts.map(function (part, i) {
+    var style = {
+      left: (100 * part.start / fileProg.numPieces) + '%',
+      width: (100 * part.count / fileProg.numPieces) + '%'
+    }
+
+    return (<div key={i} className='loading-bar-part' style={style}></div>)
+  })
+  return (<div key='loading-bar' className='loading-bar'>{loadingBarElems}</div>)
+}
+
+// Returns the CSS background-image string for a poster image + dark vignette
+function cssBackgroundImagePoster (state) {
+  var torrentSummary = state.getPlayingTorrentSummary()
+  var posterPath = TorrentSummary.getPosterPath(torrentSummary)
+  if (!posterPath) return ''
+  return cssBackgroundImageDarkGradient() + `, url(${posterPath})`
+}
+
+function cssBackgroundImageDarkGradient () {
+  return 'radial-gradient(circle at center, ' +
+    'rgba(0,0,0,0.4) 0%, rgba(0,0,0,1) 100%)'
+}
+
+function formatTime (time) {
+  if (typeof time !== 'number' || Number.isNaN(time)) {
+    return '0:00'
+  }
+
+  var hours = Math.floor(time / 3600)
+  var minutes = Math.floor(time % 3600 / 60)
+  if (hours > 0) {
+    minutes = zeroFill(2, minutes)
+  }
+  var seconds = zeroFill(2, Math.floor(time % 60))
+
+  return (hours > 0 ? hours + ':' : '') + minutes + ':' + seconds
+}

src/renderer/views/preferences.js

@@ -0,0 +1,157 @@
+const React = require('react')
+const remote = require('electron').remote
+const dialog = remote.dialog
+
+const {dispatch} = require('../lib/dispatcher')
+
+module.exports = class Preferences extends React.Component {
+  render () {
+    var state = this.props.state
+    return (
+      <div className='preferences'>
+        {renderGeneralSection(state)}
+        {renderPlaybackSection(state)}
+      </div>
+    )
+  }
+}
+
+function renderGeneralSection (state) {
+  return renderSection({
+    key: 'general',
+    title: 'General',
+    description: '',
+    icon: 'settings'
+  }, [
+    renderDownloadDirSelector(state)
+  ])
+}
+
+function renderPlaybackSection (state) {
+  return renderSection({
+    title: 'Playback',
+    description: '',
+    icon: 'settings'
+  }, [
+    renderPlayInVlcSelector(state)
+  ])
+}
+
+function renderPlayInVlcSelector (state) {
+  return renderCheckbox({
+    label: 'Play in VLC',
+    description: 'Media will play in VLC',
+    property: 'playInVlc',
+    value: state.saved.prefs.playInVlc
+  },
+  state.unsaved.prefs.playInVlc,
+  function (value) {
+    setStateValue('playInVlc', value)
+  })
+}
+
+function renderDownloadDirSelector (state) {
+  return renderFileSelector({
+    key: 'download-path',
+    label: 'Download Path',
+    description: 'Data from torrents will be saved here',
+    property: 'downloadPath',
+    options: {
+      title: 'Select download directory',
+      properties: [ 'openDirectory' ]
+    }
+  },
+  state.unsaved.prefs.downloadPath,
+  function (filePath) {
+    setStateValue('downloadPath', filePath)
+  })
+}
+
+// Renders a prefs section.
+// - definition should be {icon, title, description}
+// - controls should be an array of vdom elements
+function renderSection (definition, controls) {
+  var helpElem = !definition.description ? null : (
+    <div key='help' className='help text'>
+      <i className='icon'>help_outline</i>{definition.description}
+    </div>
+  )
+  return (
+    <section key={definition.key} className='section preferences-panel'>
+      <div className='section-container'>
+        <div key='heading' className='section-heading'>
+          <i className='icon'>{definition.icon}</i>{definition.title}
+        </div>
+        {helpElem}
+        <div key='body' className='section-body'>
+          {controls}
+        </div>
+      </div>
+    </section>
+  )
+}
+
+function renderCheckbox (definition, value, callback) {
+  var checked = ''
+  if (value) checked = 'checked'
+
+  return hx`
+    <div class='control-group'>
+      <div class='controls'>
+        <label class='control-label'>
+          <div class='preference-title'>${definition.label}</div>
+        </label>
+        <div class='controls'>
+          <label>
+            <input type='checkbox' class='checkbox'
+              onclick=${handleClick}
+              id=${definition.property}
+              ${checked} />
+
+            <span class="checkbox-label">${definition.description}</span>
+          </label>
+        </div>
+      </div>
+    </div>
+  `
+  function handleClick () {
+    callback(this.checked)
+  }
+}
+
+// Creates a file chooser
+// - defition should be {label, description, options}
+//   options are passed to dialog.showOpenDialog
+// - value should be the current pref, a file or folder path
+// - callback takes a new file or folder path
+function renderFileSelector (definition, value, callback) {
+  return (
+    <div key={definition.key} className='control-group'>
+      <div className='controls'>
+        <label className='control-label'>
+          <div className='preference-title'>{definition.label}</div>
+          <div className='preference-description'>{definition.description}</div>
+        </label>
+        <div className='controls'>
+          <input type='text' className='file-picker-text'
+            id={definition.property}
+            disabled='disabled'
+            value={value} />
+          <button className='btn' onClick={handleClick}>
+            <i className='icon'>folder_open</i>
+          </button>
+        </div>
+      </div>
+    </div>
+  )
+  function handleClick () {
+    dialog.showOpenDialog(remote.getCurrentWindow(), definition.options, function (filenames) {
+      if (!Array.isArray(filenames)) return
+      callback(filenames[0])
+    })
+  }
+}
+
+function setStateValue (property, value) {
+  dispatch('updatePreferences', property, value)
+}

src/renderer/views/remove-torrent-modal.js

@@ -0,0 +1,28 @@
+const React = require('react')
+
+const {dispatch, dispatcher} = require('../lib/dispatcher')
+
+module.exports = class RemoveTorrentModal extends React.Component {
+  render () {
+    var state = this.props.state
+    var message = state.modal.deleteData
+      ? 'Are you sure you want to remove this torrent from the list and delete the data file?'
+      : 'Are you sure you want to remove this torrent from the list?'
+    var buttonText = state.modal.deleteData ? 'Remove Data' : 'Remove'
+
+    return (
+      <div>
+        <p><strong>{message}</strong></p>
+        <p className='float-right'>
+          <button className='button button-flat' onClick={dispatcher('exitModal')}>Cancel</button>
+          <button className='button button-raised' onClick={handleRemove}>{buttonText}</button>
+        </p>
+      </div>
+    )
+
+    function handleRemove () {
+      dispatch('deleteTorrent', state.modal.infoHash, state.modal.deleteData)
+      dispatch('exitModal')
+    }
+  }
+}

src/renderer/views/torrent-list.js

@@ -0,0 +1,329 @@
+const React = require('react')
+const prettyBytes = require('prettier-bytes')
+
+const TorrentSummary = require('../lib/torrent-summary')
+const TorrentPlayer = require('../lib/torrent-player')
+const {dispatcher} = require('../lib/dispatcher')
+
+module.exports = class TorrentList extends React.Component {
+  render () {
+    var state = this.props.state
+    var torrentRows = state.saved.torrents.map(
+      (torrentSummary) => this.renderTorrent(torrentSummary)
+    )
+
+    return (
+      <div key='torrent-list' className='torrent-list'>
+        {torrentRows}
+        <div key='torrent-placeholder' className='torrent-placeholder'>
+          <span className='ellipsis'>Drop a torrent file here or paste a magnet link</span>
+        </div>
+      </div>
+    )
+  }
+
+  renderTorrent (torrentSummary) {
+    var state = this.props.state
+    var infoHash = torrentSummary.infoHash
+    var isSelected = infoHash && state.selectedInfoHash === infoHash
+
+    // Background image: show some nice visuals, like a frame from the movie, if possible
+    var style = {}
+    if (torrentSummary.posterFileName) {
+      var gradient = isSelected
+        ? 'linear-gradient(to bottom, rgba(0, 0, 0, 0.8) 0%, rgba(0, 0, 0, 0.4) 100%)'
+        : 'linear-gradient(to bottom, rgba(0, 0, 0, 0.5) 0%, rgba(0, 0, 0, 0) 100%)'
+      var posterPath = TorrentSummary.getPosterPath(torrentSummary)
+      style.backgroundImage = gradient + `, url('${posterPath}')`
+    }
+
+    // Foreground: name of the torrent, basic info like size, play button,
+    // cast buttons if available, and delete
+    var classes = ['torrent']
+    //  playStatus turns the play button into a loading spinner or error icon
+    if (torrentSummary.playStatus) classes.push(torrentSummary.playStatus)
+    if (isSelected) classes.push('selected')
+    if (!infoHash) classes.push('disabled')
+    return (
+      <div
+        key={torrentSummary.torrentKey}
+        style={style}
+        className={classes.join(' ')}
+        onContextMenu={infoHash && dispatcher('openTorrentContextMenu', infoHash)}
+        onClick={infoHash && dispatcher('toggleSelectTorrent', infoHash)}>
+        {this.renderTorrentMetadata(torrentSummary)}
+        {infoHash ? this.renderTorrentButtons(torrentSummary) : null}
+        {isSelected ? this.renderTorrentDetails(torrentSummary) : null}
+      </div>
+    )
+  }
+
+  // Show name, download status, % complete
+  renderTorrentMetadata (torrentSummary) {
+    var name = torrentSummary.name || 'Loading torrent...'
+    var elements = [(
+      <div key='name' className='name ellipsis'>{name}</div>
+    )]
+
+    // If it's downloading/seeding then show progress info
+    var prog = torrentSummary.progress
+    if (torrentSummary.status !== 'paused' && prog) {
+      elements.push((
+        <div key='progress-info' className='ellipsis'>
+          {renderPercentProgress()}
+          {renderTotalProgress()}
+          {renderPeers()}
+          {renderDownloadSpeed()}
+          {renderUploadSpeed()}
+          {renderEta()}
+        </div>
+      ))
+    }
+
+    return (<div key='metadata' className='metadata'>{elements}</div>)
+
+    function renderPercentProgress () {
+      var progress = Math.floor(100 * prog.progress)
+      return (<span key='percent-progress'>{progress}%</span>)
+    }
+
+    function renderTotalProgress () {
+      var downloaded = prettyBytes(prog.downloaded)
+      var total = prettyBytes(prog.length || 0)
+      if (downloaded === total) {
+        return (<span key='total-progress'>{downloaded}</span>)
+      } else {
+        return (<span key='total-progress'>{downloaded} / {total}</span>)
+      }
+    }
+
+    function renderPeers () {
+      if (prog.numPeers === 0) return
+      var count = prog.numPeers === 1 ? 'peer' : 'peers'
+      return (<span key='peers'>{prog.numPeers} {count}</span>)
+    }
+
+    function renderDownloadSpeed () {
+      if (prog.downloadSpeed === 0) return
+      return (<span key='download'>↓ {prettyBytes(prog.downloadSpeed)}/s</span>)
+    }
+
+    function renderUploadSpeed () {
+      if (prog.uploadSpeed === 0) return
+      return (<span key='upload'>↑ {prettyBytes(prog.uploadSpeed)}/s</span>)
+    }
+
+    function renderEta () {
+      var downloaded = prog.downloaded
+      var total = prog.length || 0
+      var missing = total - downloaded
+      var downloadSpeed = prog.downloadSpeed
+      if (downloadSpeed === 0 || missing === 0) return
+
+      var rawEta = missing / downloadSpeed
+      var hours = Math.floor(rawEta / 3600) % 24
+      var minutes = Math.floor(rawEta / 60) % 60
+      var seconds = Math.floor(rawEta % 60)
+
+      // Only display hours and minutes if they are greater than 0 but always
+      // display minutes if hours is being displayed
+      var hoursStr = hours ? hours + 'h' : ''
+      var minutesStr = (hours || minutes) ? minutes + 'm' : ''
+      var secondsStr = seconds + 's'
+
+      return (<span>ETA: {hoursStr} {minutesStr} {secondsStr}</span>)
+    }
+  }
+
+  // Download button toggles between torrenting (DL/seed) and paused
+  // Play button starts streaming the torrent immediately, unpausing if needed
+  renderTorrentButtons (torrentSummary) {
+    var infoHash = torrentSummary.infoHash
+
+    var playIcon, playTooltip, playClass
+    if (torrentSummary.playStatus === 'timeout') {
+      playIcon = 'warning'
+      playTooltip = 'Playback timed out. No seeds? No internet? Click to try again.'
+    } else {
+      playIcon = 'play_arrow'
+      playTooltip = 'Start streaming'
+    }
+
+    var downloadIcon, downloadTooltip
+    if (torrentSummary.status === 'seeding') {
+      downloadIcon = 'file_upload'
+      downloadTooltip = 'Seeding. Click to stop.'
+    } else if (torrentSummary.status === 'downloading') {
+      downloadIcon = 'file_download'
+      downloadTooltip = 'Torrenting. Click to stop.'
+    } else {
+      downloadIcon = 'file_download'
+      downloadTooltip = 'Click to start torrenting.'
+    }
+
+    // Do we have a saved position? Show it using a radial progress bar on top
+    // of the play button, unless already showing a spinner there:
+    var positionElem
+    var willShowSpinner = torrentSummary.playStatus === 'requested'
+    var defaultFile = torrentSummary.files &&
+      torrentSummary.files[torrentSummary.defaultPlayFileIndex]
+    if (defaultFile && defaultFile.currentTime && !willShowSpinner) {
+      var fraction = defaultFile.currentTime / defaultFile.duration
+      positionElem = this.renderRadialProgressBar(fraction, 'radial-progress-large')
+      playClass = 'resume-position'
+    }
+
+    // Only show the play button for torrents that contain playable media
+    var playButton
+    if (TorrentPlayer.isPlayableTorrentSummary(torrentSummary)) {
+      playButton = (
+        <i
+          key='play-button'
+          title={playTooltip}
+          className={'button-round icon play ' + playClass}
+          onClick={dispatcher('playFile', infoHash)}>
+          {playIcon}
+        </i>
+      )
+    }
+
+    return (
+      <div key='buttons' className='buttons'>
+        {positionElem}
+        {playButton}
+        <i
+          key='download-button'
+          className={'button-round icon download ' + torrentSummary.status}
+          title={downloadTooltip}
+          onClick={dispatcher('toggleTorrent', infoHash)}>
+          {downloadIcon}
+        </i>
+        <i
+          key='delete-button'
+          className='icon delete'
+          title='Remove torrent'
+          onClick={dispatcher('confirmDeleteTorrent', infoHash, false)}>
+          close
+        </i>
+      </div>
+    )
+  }
+
+  // Show files, per-file download status and play buttons, and so on
+  renderTorrentDetails (torrentSummary) {
+    var filesElement
+    if (!torrentSummary.files) {
+      // We don't know what files this torrent contains
+      var message = torrentSummary.status === 'paused'
+        ? 'Failed to load torrent info. Click the download button to try again...'
+        : 'Downloading torrent info...'
+      filesElement = (<div key='files' className='files warning'>{message}</div>)
+    } else {
+      // We do know the files. List them and show download stats for each one
+      var fileRows = torrentSummary.files
+        .filter((file) => !file.path.includes('/.____padding_file/'))
+        .map((file, index) => ({ file, index }))
+        .sort(function (a, b) {
+          if (a.file.name < b.file.name) return -1
+          if (b.file.name < a.file.name) return 1
+          return 0
+        })
+        .map((object) => this.renderFileRow(torrentSummary, object.file, object.index))
+
+      filesElement = (
+        <div key='files' className='files'>
+          <table>
+            <tbody>
+              {fileRows}
+            </tbody>
+          </table>
+        </div>
+      )
+    }
+
+    return (
+      <div key='details' className='torrent-details'>
+        {filesElement}
+      </div>
+    )
+  }
+
+  // Show a single torrentSummary file in the details view for a single torrent
+  renderFileRow (torrentSummary, file, index) {
+    // First, find out how much of the file we've downloaded
+    // Are we even torrenting it?
+    var isSelected = torrentSummary.selections && torrentSummary.selections[index]
+    var isDone = false // Are we finished torrenting it?
+    var progress = ''
+    if (torrentSummary.progress && torrentSummary.progress.files) {
+      var fileProg = torrentSummary.progress.files[index]
+      isDone = fileProg.numPiecesPresent === fileProg.numPieces
+      progress = Math.round(100 * fileProg.numPiecesPresent / fileProg.numPieces) + '%'
+    }
+
+    // Second, for media files where we saved our position, show how far we got
+    var positionElem
+    if (file.currentTime) {
+      // Radial progress bar. 0% = start from 0:00, 270% = 3/4 of the way thru
+      positionElem = this.renderRadialProgressBar(file.currentTime / file.duration)
+    }
+
+    // Finally, render the file as a table row
+    var isPlayable = TorrentPlayer.isPlayable(file)
+    var infoHash = torrentSummary.infoHash
+    var icon
+    var handleClick
+    if (isPlayable) {
+      icon = 'play_arrow' /* playable? add option to play */
+      handleClick = dispatcher('playFile', infoHash, index)
+    } else {
+      icon = 'description' /* file icon, opens in OS default app */
+      handleClick = dispatcher('openItem', infoHash, index)
+    }
+    var rowClass = ''
+    if (!isSelected) rowClass = 'disabled' // File deselected, not being torrented
+    if (!isDone && !isPlayable) rowClass = 'disabled' // Can't open yet, can't stream
+    return (
+      <tr key={index} onClick={handleClick}>
+        <td className={'col-icon ' + rowClass}>
+          {positionElem}
+          <i className='icon'>{icon}</i>
+        </td>
+        <td className={'col-name ' + rowClass}>
+          {file.name}
+        </td>
+        <td className={'col-progress ' + rowClass}>
+          {isSelected ? progress : ''}
+        </td>
+        <td className={'col-size ' + rowClass}>
+          {prettyBytes(file.length)}
+        </td>
+        <td className='col-select'
+          onClick={dispatcher('toggleTorrentFile', infoHash, index)}>
+          <i className='icon'>{isSelected ? 'close' : 'add'}</i>
+        </td>
+      </tr>
+    )
+  }
+
+  renderRadialProgressBar (fraction, cssClass) {
+    var rotation = 360 * fraction
+    var transformFill = {transform: 'rotate(' + (rotation / 2) + 'deg)'}
+    var transformFix = {transform: 'rotate(' + rotation + 'deg)'}
+
+    return (
+      <div key='radial-progress' className={'radial-progress ' + cssClass}>
+        <div key='circle' className='circle'>
+          <div key='mask-full' className='mask full' style={transformFill}>
+            <div key='fill' className='fill' style={transformFill}></div>
+          </div>
+          <div key='mask-half' className='mask half'>
+            <div key='fill' className='fill' style={transformFill}></div>
+            <div key='fill-fix' className='fill fix' style={transformFix}></div>
+          </div>
+        </div>
+        <div key='inset' className='inset'></div>
+      </div>
+    )
+  }
+}

src/renderer/views/unsupported-media-modal.js

@@ -0,0 +1,39 @@
+const React = require('react')
+const electron = require('electron')
+
+const {dispatcher} = require('../lib/dispatcher')
+
+module.exports = class UnsupportedMediaModal extends React.Component {
+  render () {
+    var state = this.props.state
+    var err = state.modal.error
+    var message = (err && err.getMessage)
+      ? err.getMessage()
+      : err
+    var actionButton = state.modal.vlcInstalled
+      ? (<button className='button-raised' onClick={dispatcher('vlcPlay')}>Play in VLC</button>)
+      : (<button className='button-raised' onClick={() => this.onInstall}>Install VLC</button>)
+    var vlcMessage = state.modal.vlcNotFound
+      ? 'Couldn\'t run VLC. Please make sure it\'s installed.'
+      : ''
+    return (
+      <div>
+        <p><strong>Sorry, we can't play that file.</strong></p>
+        <p>{message}</p>
+        <p className='float-right'>
+          <button className='button-flat' onClick={dispatcher('backToList')}>Cancel</button>
+          {actionButton}
+        </p>
+        <p className='error-text'>{vlcMessage}</p>
+      </div>
+    )
+  }
+
+  onInstall () {
+    electron.shell.openExternal('http://www.videolan.org/vlc/')
+
+    // TODO: dcposch send a dispatch rather than modifying state directly
+    var state = this.props.state
+    state.modal.vlcInstalled = true // Assume they'll install it successfully
+  }
+}

src/renderer/views/update-available-modal.js

@@ -0,0 +1,30 @@
+const React = require('react')
+const electron = require('electron')
+
+const {dispatch} = require('../lib/dispatcher')
+
+module.exports = class UpdateAvailableModal extends React.Component {
+  render () {
+    var state = this.props.state
+    return (
+      <div className='update-available-modal'>
+        <p><strong>A new version of WebTorrent is available: v{state.modal.version}</strong></p>
+        <p>We have an auto-updater for Windows and Mac. We don't have one for Linux yet, so you'll have to download the new version manually.</p>
+        <p className='float-right'>
+          <button className='button button-flat' onClick={handleCancel}>Skip This Release</button>
+          <button className='button button-raised' onClick={handleOK}>Show Download Page</button>
+        </p>
+      </div>
+    )
+
+    function handleOK () {
+      electron.shell.openExternal('https://github.com/feross/webtorrent-desktop/releases')
+      dispatch('exitModal')
+    }
+
+    function handleCancel () {
+      dispatch('skipVersion', state.modal.version)
+      dispatch('exitModal')
+    }
+  }
+}

src/renderer/webtorrent.js

@@ -0,0 +1,392 @@
+// To keep the UI snappy, we run WebTorrent in its own hidden window, a separate
+// process from the main window.
+console.time('init')
+
+var deepEqual = require('deep-equal')
+var defaultAnnounceList = require('create-torrent').announceList
+var electron = require('electron')
+var fs = require('fs-extra')
+var hat = require('hat')
+var musicmetadata = require('musicmetadata')
+var networkAddress = require('network-address')
+var path = require('path')
+var WebTorrent = require('webtorrent')
+var zeroFill = require('zero-fill')
+
+var crashReporter = require('../crash-reporter')
+var config = require('../config')
+var torrentPoster = require('./lib/torrent-poster')
+
+// Report when the process crashes
+crashReporter.init()
+
+// Send & receive messages from the main window
+var ipc = electron.ipcRenderer
+
+// Force use of webtorrent trackers on all torrents
+global.WEBTORRENT_ANNOUNCE = defaultAnnounceList
+  .map((arr) => arr[0])
+  .filter((url) => url.indexOf('wss://') === 0 || url.indexOf('ws://') === 0)
+
+/**
+ * WebTorrent version.
+ */
+var VERSION = require('../../package.json').version
+
+/**
+ * Version number in Azureus-style. Generated from major and minor semver version.
+ * For example:
+ *   '0.16.1' -> '0016'
+ *   '1.2.5' -> '0102'
+ */
+var VERSION_STR = VERSION.match(/([0-9]+)/g)
+  .slice(0, 2)
+  .map((v) => zeroFill(2, v))
+  .join('')
+
+/**
+ * Version prefix string (used in peer ID). WebTorrent uses the Azureus-style
+ * encoding: '-', two characters for client id ('WW'), four ascii digits for version
+ * number, '-', followed by random numbers.
+ * For example:
+ *   '-WW0102-'...
+ */
+var VERSION_PREFIX = '-WD' + VERSION_STR + '-'
+
+// Connect to the WebTorrent and BitTorrent networks. WebTorrent Desktop is a hybrid
+// client, as explained here: https://webtorrent.io/faq
+var client = window.client = new WebTorrent({
+  peerId: Buffer.from(VERSION_PREFIX + hat(48))
+})
+
+// WebTorrent-to-HTTP streaming sever
+var server = null
+
+// Used for diffing, so we only send progress updates when necessary
+var prevProgress = null
+
+init()
+
+function init () {
+  client.on('warning', (err) => ipc.send('wt-warning', null, err.message))
+  client.on('error', (err) => ipc.send('wt-error', null, err.message))
+
+  ipc.on('wt-start-torrenting', (e, torrentKey, torrentID, path, fileModtimes, selections) =>
+    startTorrenting(torrentKey, torrentID, path, fileModtimes, selections))
+  ipc.on('wt-stop-torrenting', (e, infoHash) =>
+    stopTorrenting(infoHash))
+  ipc.on('wt-create-torrent', (e, torrentKey, options) =>
+    createTorrent(torrentKey, options))
+  ipc.on('wt-save-torrent-file', (e, torrentKey) =>
+    saveTorrentFile(torrentKey))
+  ipc.on('wt-generate-torrent-poster', (e, torrentKey) =>
+    generateTorrentPoster(torrentKey))
+  ipc.on('wt-get-audio-metadata', (e, infoHash, index) =>
+    getAudioMetadata(infoHash, index))
+  ipc.on('wt-start-server', (e, infoHash, index) =>
+    startServer(infoHash, index))
+  ipc.on('wt-stop-server', (e) =>
+    stopServer())
+  ipc.on('wt-select-files', (e, infoHash, selections) =>
+    selectFiles(infoHash, selections))
+
+  ipc.send('ipcReadyWebTorrent')
+
+  window.addEventListener('error', (e) =>
+    ipc.send('wt-uncaught-error', {message: e.error.message, stack: e.error.stack}),
+    true)
+
+  setInterval(updateTorrentProgress, 1000)
+}
+
+// Starts a given TorrentID, which can be an infohash, magnet URI, etc. Returns WebTorrent object
+// See https://github.com/feross/webtorrent/blob/master/docs/api.md#clientaddtorrentid-opts-function-ontorrent-torrent-
+function startTorrenting (torrentKey, torrentID, path, fileModtimes, selections) {
+  console.log('starting torrent %s: %s', torrentKey, torrentID)
+
+  var torrent = client.add(torrentID, {
+    path: path,
+    fileModtimes: fileModtimes
+  })
+  torrent.key = torrentKey
+
+  // Listen for ready event, progress notifications, etc
+  addTorrentEvents(torrent)
+
+  // Only download the files the user wants, not necessarily all files
+  torrent.once('ready', () => selectFiles(torrent, selections))
+
+  return torrent
+}
+
+function stopTorrenting (infoHash) {
+  var torrent = client.get(infoHash)
+  if (torrent) torrent.destroy()
+}
+
+// Create a new torrent, start seeding
+function createTorrent (torrentKey, options) {
+  console.log('creating torrent', torrentKey, options)
+  var paths = options.files.map((f) => f.path)
+  var torrent = client.seed(paths, options)
+  torrent.key = torrentKey
+  addTorrentEvents(torrent)
+  ipc.send('wt-new-torrent')
+}
+
+function addTorrentEvents (torrent) {
+  torrent.on('warning', (err) =>
+    ipc.send('wt-warning', torrent.key, err.message))
+  torrent.on('error', (err) =>
+    ipc.send('wt-error', torrent.key, err.message))
+  torrent.on('infoHash', () =>
+    ipc.send('wt-infohash', torrent.key, torrent.infoHash))
+  torrent.on('metadata', torrentMetadata)
+  torrent.on('ready', torrentReady)
+  torrent.on('done', torrentDone)
+
+  function torrentMetadata () {
+    var info = getTorrentInfo(torrent)
+    ipc.send('wt-metadata', torrent.key, info)
+
+    updateTorrentProgress()
+  }
+
+  function torrentReady () {
+    var info = getTorrentInfo(torrent)
+    ipc.send('wt-ready', torrent.key, info)
+    ipc.send('wt-ready-' + torrent.infoHash, torrent.key, info) // TODO: hack
+
+    updateTorrentProgress()
+  }
+
+  function torrentDone () {
+    var info = getTorrentInfo(torrent)
+    ipc.send('wt-done', torrent.key, info)
+
+    updateTorrentProgress()
+
+    torrent.getFileModtimes(function (err, fileModtimes) {
+      if (err) return onError(err)
+      ipc.send('wt-file-modtimes', torrent.key, fileModtimes)
+    })
+  }
+}
+
+// Produces a JSON saveable summary of a torrent
+function getTorrentInfo (torrent) {
+  return {
+    infoHash: torrent.infoHash,
+    magnetURI: torrent.magnetURI,
+    name: torrent.name,
+    path: torrent.path,
+    files: torrent.files.map(getTorrentFileInfo),
+    bytesReceived: torrent.received
+  }
+}
+
+// Produces a JSON saveable summary of a file in a torrent
+function getTorrentFileInfo (file) {
+  return {
+    name: file.name,
+    length: file.length,
+    path: file.path
+  }
+}
+
+// Every time we resolve a magnet URI, save the torrent file so that we never
+// have to download it again. Never ask the DHT the same question twice.
+function saveTorrentFile (torrentKey) {
+  var torrent = getTorrent(torrentKey)
+  checkIfTorrentFileExists(torrent.infoHash, function (torrentPath, exists) {
+    var fileName = torrent.infoHash + '.torrent'
+    if (exists) {
+      // We've already saved the file
+      return ipc.send('wt-file-saved', torrentKey, fileName)
+    }
+
+    // Otherwise, save the .torrent file, under the app config folder
+    fs.mkdir(config.TORRENT_PATH, function (_) {
+      fs.writeFile(torrentPath, torrent.torrentFile, function (err) {
+        if (err) return console.log('error saving torrent file %s: %o', torrentPath, err)
+        console.log('saved torrent file %s', torrentPath)
+        return ipc.send('wt-file-saved', torrentKey, fileName)
+      })
+    })
+  })
+}
+
+// Checks whether we've already resolved a given infohash to a torrent file
+// Calls back with (torrentPath, exists). Logs, does not call back on error
+function checkIfTorrentFileExists (infoHash, cb) {
+  var torrentPath = path.join(config.TORRENT_PATH, infoHash + '.torrent')
+  fs.exists(torrentPath, function (exists) {
+    cb(torrentPath, exists)
+  })
+}
+
+// Save a JPG that represents a torrent.
+// Auto chooses either a frame from a video file, an image, etc
+function generateTorrentPoster (torrentKey) {
+  var torrent = getTorrent(torrentKey)
+  torrentPoster(torrent, function (err, buf, extension) {
+    if (err) return console.log('error generating poster: %o', err)
+    // save it for next time
+    fs.mkdirp(config.POSTER_PATH, function (err) {
+      if (err) return console.log('error creating poster dir: %o', err)
+      var posterFileName = torrent.infoHash + extension
+      var posterFilePath = path.join(config.POSTER_PATH, posterFileName)
+      fs.writeFile(posterFilePath, buf, function (err) {
+        if (err) return console.log('error saving poster: %o', err)
+        // show the poster
+        ipc.send('wt-poster', torrentKey, posterFileName)
+      })
+    })
+  })
+}
+
+function updateTorrentProgress () {
+  var progress = getTorrentProgress()
+  // TODO: diff torrent-by-torrent, not once for the whole update
+  if (prevProgress && deepEqual(progress, prevProgress, {strict: true})) {
+    return /* don't send heavy object if it hasn't changed */
+  }
+  ipc.send('wt-progress', progress)
+  prevProgress = progress
+}
+
+function getTorrentProgress () {
+  // First, track overall progress
+  var progress = client.progress
+  var hasActiveTorrents = client.torrents.some(function (torrent) {
+    return torrent.progress !== 1
+  })
+
+  // Track progress for every file in each torrent
+  // TODO: ideally this would be tracked by WebTorrent, which could do it
+  // more efficiently than looping over torrent.bitfield
+  var torrentProg = client.torrents.map(function (torrent) {
+    var fileProg = torrent.files && torrent.files.map(function (file, index) {
+      var numPieces = file._endPiece - file._startPiece + 1
+      var numPiecesPresent = 0
+      for (var piece = file._startPiece; piece <= file._endPiece; piece++) {
+        if (torrent.bitfield.get(piece)) numPiecesPresent++
+      }
+      return {
+        startPiece: file._startPiece,
+        endPiece: file._endPiece,
+        numPieces,
+        numPiecesPresent
+      }
+    })
+    return {
+      torrentKey: torrent.key,
+      ready: torrent.ready,
+      progress: torrent.progress,
+      downloaded: torrent.downloaded,
+      downloadSpeed: torrent.downloadSpeed,
+      uploadSpeed: torrent.uploadSpeed,
+      numPeers: torrent.numPeers,
+      length: torrent.length,
+      bitfield: torrent.bitfield,
+      files: fileProg
+    }
+  })
+
+  return {
+    torrents: torrentProg,
+    progress,
+    hasActiveTorrents
+  }
+}
+
+function startServer (infoHash, index) {
+  var torrent = client.get(infoHash)
+  if (torrent.ready) startServerFromReadyTorrent(torrent, index)
+  else torrent.once('ready', () => startServerFromReadyTorrent(torrent, index))
+}
+
+function startServerFromReadyTorrent (torrent, index, cb) {
+  if (server) return
+
+  // start the streaming torrent-to-http server
+  server = torrent.createServer()
+  server.listen(0, function () {
+    var port = server.address().port
+    var urlSuffix = ':' + port + '/' + index
+    var info = {
+      torrentKey: torrent.key,
+      localURL: 'http://localhost' + urlSuffix,
+      networkURL: 'http://' + networkAddress() + urlSuffix
+    }
+
+    ipc.send('wt-server-running', info)
+    ipc.send('wt-server-' + torrent.infoHash, info) // TODO: hack
+  })
+}
+
+function stopServer () {
+  if (!server) return
+  server.destroy()
+  server = null
+}
+
+function getAudioMetadata (infoHash, index) {
+  var torrent = client.get(infoHash)
+  var file = torrent.files[index]
+  musicmetadata(file.createReadStream(), function (err, info) {
+    if (err) return
+    console.log('got audio metadata for %s: %o', file.name, info)
+    ipc.send('wt-audio-metadata', infoHash, index, info)
+  })
+}
+
+function selectFiles (torrentOrInfoHash, selections) {
+  // Get the torrent object
+  var torrent
+  if (typeof torrentOrInfoHash === 'string') {
+    torrent = client.get(torrentOrInfoHash)
+  } else {
+    torrent = torrentOrInfoHash
+  }
+
+  // Selections not specified?
+  // Load all files. We still need to replace the default whole-torrent
+  // selection with individual selections for each file, so we can
+  // select/deselect files later on
+  if (!selections) {
+    selections = torrent.files.map((x) => true)
+  }
+
+  // Selections specified incorrectly?
+  if (selections.length !== torrent.files.length) {
+    throw new Error('got ' + selections.length + ' file selections, ' +
+      'but the torrent contains ' + torrent.files.length + ' files')
+  }
+
+  // Remove default selection (whole torrent)
+  torrent.deselect(0, torrent.pieces.length - 1, false)
+
+  // Add selections (individual files)
+  for (var i = 0; i < selections.length; i++) {
+    var file = torrent.files[i]
+    if (selections[i]) {
+      file.select()
+    } else {
+      console.log('deselecting file ' + i + ' of torrent ' + torrent.name)
+      file.deselect()
+    }
+  }
+}
+
+// Gets a WebTorrent handle by torrentKey
+// Throws an Error if we're not currently torrenting anything w/ that key
+function getTorrent (torrentKey) {
+  var ret = client.torrents.find((x) => x.key === torrentKey)
+  if (!ret) throw new Error('missing torrent key ' + torrentKey)
+  return ret
+}
+
+function onError (err) {
+  console.log(err)
+}