src/middleware/auth.js

const jwt = require('jsonwebtoken');
const env = require('../config/env');

function authenticate(req, res, next) {
  const authHeader = req.headers.authorization || '';
  const [scheme, token] = authHeader.split(' ');

  if (scheme !== 'Bearer' || !token) {
    return res.status(401).json({ message: 'Unauthorized' });
  }

  try {
    const payload = jwt.verify(token, env.jwtSecret);
    req.user = payload;
    return next();
  } catch (_err) {
    return res.status(401).json({ message: 'Invalid or expired token' });
  }
}

function authorize(...roles) {
  return (req, res, next) => {
    if (!req.user || !roles.includes(req.user.role)) {
      return res.status(403).json({ message: 'Forbidden' });
    }
    return next();
  };
}

module.exports = { authenticate, authorize };