updater.js

const {dialog, BrowserWindow} = require('electron')
const {autoUpdater} = require('electron-updater')

const path = require('path')
const url = require('url')

autoUpdater.logger = require('electron-log')
autoUpdater.logger.transports.file.level = 'info'

autoUpdater.autoDownload = false

exports.check = () => {
  autoUpdater.checkForUpdates()

  autoUpdater.on('update-available', () => {

    dialog.showMessageBox({
      type: 'info',
      title: 'Update Available',
      message: 'A new version of PIA is available. Do you want to update now?',
      buttons: ['Update', 'No']
    }, (buttonIndex) => {
      if(buttonIndex !== 0) return

      autoUpdater.downloadUpdate()

      let progressWin = new BrowserWindow({
        width: 350,
        height: 35,
        useContentSize: true,
        autoHideMenuBar: true,
        maximizable: false,
        fullscreen: false,
        fullscreenable: false,
        resizable: false
      })

      progressWin.loadURL(url.format({
        pathname: path.join(__dirname, 'renderer', 'progress.html'),
        protocol: 'file:',
        slashes: true
      }))

      progressWin.on('closed', () => {
        progressWin = null
      })

      autoUpdater.on('update-downloaded', () => {
        if (progressWin) progressWin.close()
        dialog.showMessageBox({
          type: 'info',
          title: 'Update ready',
          message: 'A new version of PIA is ready. Quit and install now?',
          buttons: ['Yes', 'Later']
        }, (buttonIndex) => {
          if (buttonIndex === 0) autoUpdater.quitAndInstall()
        })
      })
    })
  })
}