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const jwt = require('jsonwebtoken');


const authenticateToken = (req, res, next) => {
  const authHeader = req.headers['authorization'];
  const token = authHeader && authHeader.split(' ')[1];

  if (!token) {
    return res.status(401).json({ message: 'Authentication token not found.' });
  }

  jwt.verify(token, process.env.JWT_SECRET_KEY, (err, user) => {
    if (err) {
      return res.status(403).json({ message: 'Invalid token.' });
    }

    req.user = user;
    next();
  });
};