GestionLocative/backend/src/auth.js

const jwt = require('jsonwebtoken');

const JWT_SECRET = process.env.JWT_SECRET || 'gestion_locative_secret_2024';

const authMiddleware = (req, res, next) => {
  const authHeader = req.headers['authorization'];
  const token = authHeader && authHeader.split(' ')[1];
  if (!token) return res.status(401).json({ error: 'Token manquant' });

  try {
    const decoded = jwt.verify(token, JWT_SECRET);
    req.userId = decoded.userId;
    next();
  } catch {
    res.status(403).json({ error: 'Token invalide' });
  }
};

module.exports = { authMiddleware, JWT_SECRET };