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403 error while trying to download update from S3.

See original GitHub issue

Version: 22.3.6

Electron Version: 7.1.13
Electron Type (current, beta, nightly):

electron-updater: v4.2.0

Target: dmg

My app is successfully detecting that there is an update available, but returns a 403 error when it tries to fetch the mac.zip file for download. The file exists in S3. Does the code need an Apple Developer signature before it can be downloaded or something?

Error:

error: Error in auto-updater. Error: Cannot download "https://bucket-name.s3.amazonaws.com/app-15.0.0-mac.zip", status 403: Forbidden

Code

const opts = {
  service: 's3',
  method: 'GET',
  region: 'us-east-1',
  host: 'bucket.s3.us-east-1.amazonaws.com',
  path: process.platform === 'win32' ? '/latest.yml' : '/latest-mac.yml'
};

aws4.sign(opts, {
  accessKeyId: process.env.UPDATER_AWS_ACCESS_KEY_ID,
  secretAccessKey: process.env.UPDATER_AWS_SECRET_ACCESS_KEY
});

autoUpdater.requestHeaders = opts.headers;

if (isDev) {
  autoUpdater.updateConfigPath = path.join(
    __dirname,
    '../../dev-app-update.yml'
  );
  autoUpdater.checkForUpdates();
} else {
  autoUpdater.checkForUpdatesAndNotify();
}

autoUpdater.on('checking-for-update', () => {
  logger.info('Checking for update...');
});

autoUpdater.on('update-available', () => {
  logger.info('Update available.');
});

autoUpdater.on('update-not-available', () => {
  logger.info('Update not available.');
});

autoUpdater.on('error', err => {
  logger.error(`Error in auto-updater. ${err}`);
});

autoUpdater.on('download-progress', progressObj => {
  let logMessage = `Download speed: ${progressObj.bytesPerSecond}`;
  logMessage = `${logMessage} - Downloaded ${progressObj.percent}%`;
  logMessage = `${logMessage} (${progressObj.transferred}/${progressObj.total})`;
  logger.info(logMessage);
});

autoUpdater.on('update-downloaded', () => {
  logger.info('Update downloaded');
});