export function ownerOnly(req, res, next) {
  const expected = process.env.OWNER_TOKEN;
  if (!expected) {
    return res.status(500).json({
      error: { code: 'no_owner_token', message: 'OWNER_TOKEN not configured' }
    });
  }
  const auth = req.headers.authorization || '';
  const [scheme, token] = auth.split(' ');
  if (scheme !== 'Bearer' || token !== expected) {
    return res.status(401).json({
      error: { code: 'unauthorized', message: 'invalid token' }
    });
  }
  req.actor = { kind: 'user', id: null };
  next();
}