backend/src/middleware/requireAuth.ts


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import express from 'express';
import { prisma } from '../config/db';

export const requireAuth = async (req: express.Request, res: express.Response, next: express.NextFunction) => {
  if (!req.session.userId) {
    return res.status(401).json({ error: 'Authentication required' });
  }

  try {
    const user = await prisma.user.findUnique({
      where: { id: req.session.userId },
      select: { id: true, username: true, email: true }
    });

    if (!user) {
      req.session.destroy((err) => {
        if (err) console.error('Session destroy error:', err);
      });
      return res.status(401).json({ error: 'Invalid session' });
    }

    (req as any).user = user;
    next();
  } catch (error) {
    console.error('Auth middleware error:', error);
    res.status(500).json({ error: 'Internal server error' });
  }
};