electron/atom/browser/api/lib/auto-updater/auto-updater-win.js

const app = require('electron').app;
const EventEmitter = require('events').EventEmitter;
const url = require('url');
const squirrelUpdate = require('./squirrel-update-win');
const util = require('util');

function AutoUpdater() {
  AutoUpdater.super_.call(this);
}

util.inherits(AutoUpdater, EventEmitter);

AutoUpdater.prototype.quitAndInstall = function() {
  squirrelUpdate.processStart();
  return app.quit();
};

AutoUpdater.prototype.setFeedURL = function(updateURL) {
  return this.updateURL = updateURL;
};

AutoUpdater.prototype.checkForUpdates = function() {
  if (!this.updateURL) {
    return this.emitError('Update URL is not set');
  }
  if (!squirrelUpdate.supported()) {
    return this.emitError('Can not find Squirrel');
  }
  this.emit('checking-for-update');
  return squirrelUpdate.download(this.updateURL, (function(_this) {
    return function(error, update) {
      if (error != null) {
        return _this.emitError(error);
      }
      if (update == null) {
        return _this.emit('update-not-available');
      }
      _this.emit('update-available');
      return squirrelUpdate.update(_this.updateURL, function(error) {
        var date, releaseNotes, version;
        if (error != null) {
          return _this.emitError(error);
        }
        releaseNotes = update.releaseNotes, version = update.version;

        // Following information is not available on Windows, so fake them.
        date = new Date;
        url = _this.updateURL;
        return _this.emit('update-downloaded', {}, releaseNotes, version, date, url, function() {
          return _this.quitAndInstall();
        });
      });
    };
  })(this));
};

// Private: Emit both error object and message, this is to keep compatibility
// with Old APIs.
AutoUpdater.prototype.emitError = function(message) {
  return this.emit('error', new Error(message), message);
};

module.exports = new AutoUpdater;