btpxpress-frontend/middleware.ts

/**
 * Middleware Next.js pour l'authentification OAuth avec Keycloak
 *
 * Ce middleware protège les routes privées en vérifiant la présence
 * d'un access_token dans les cookies HttpOnly.
 */

import { NextResponse } from 'next/server';
import type { NextRequest } from 'next/server';

// Routes publiques accessibles sans authentification
const PUBLIC_ROUTES = [
  '/',
  '/auth/login',
  '/auth/callback',
  '/api/auth/login',
  '/api/auth/callback',
  '/api/auth/token',
  '/api/health',
];

// Routes API publiques (patterns)
const PUBLIC_API_PATTERNS = [
  /^\/api\/auth\/.*/,
  /^\/api\/health/,
];

// Vérifie si une route est publique
function isPublicRoute(pathname: string): boolean {
  // Vérifier les routes exactes
  if (PUBLIC_ROUTES.includes(pathname)) {
    return true;
  }

  // Vérifier les patterns
  return PUBLIC_API_PATTERNS.some(pattern => pattern.test(pathname));
}

export function middleware(request: NextRequest) {
  const { pathname } = request.nextUrl;

  console.log('🔒 Middleware - Checking:', pathname);

  // Laisser passer les routes publiques
  if (isPublicRoute(pathname)) {
    console.log('✅ Middleware - Public route, allowing');
    return NextResponse.next();
  }

  // Laisser passer les fichiers statiques
  if (
    pathname.startsWith('/_next') ||
    pathname.startsWith('/static') ||
    pathname.includes('.')
  ) {
    return NextResponse.next();
  }

  // Vérifier la présence du token d'authentification
  const accessToken = request.cookies.get('access_token');
  const tokenExpiresAt = request.cookies.get('token_expires_at');

  if (!accessToken) {
    console.log('❌ Middleware - No access token, redirecting to login');

    // Rediriger vers la page de login avec l'URL de retour
    const loginUrl = new URL('/auth/login', request.url);
    loginUrl.searchParams.set('returnUrl', pathname);

    return NextResponse.redirect(loginUrl);
  }

  // Vérifier si le token est expiré
  if (tokenExpiresAt) {
    const expiresAt = parseInt(tokenExpiresAt.value, 10);
    const now = Date.now();

    if (now >= expiresAt) {
      console.log('❌ Middleware - Token expired, redirecting to login');

      // Supprimer les cookies expirés
      const response = NextResponse.redirect(new URL('/auth/login', request.url));
      response.cookies.delete('access_token');
      response.cookies.delete('refresh_token');
      response.cookies.delete('id_token');
      response.cookies.delete('token_expires_at');

      return response;
    }
  }

  console.log('✅ Middleware - Authenticated, allowing');

  // L'utilisateur est authentifié, laisser passer
  return NextResponse.next();
}

// Configuration du matcher - appliqué à toutes les routes sauf les fichiers statiques
export const config = {
  matcher: [
    /*
     * Match all request paths except for the ones starting with:
     * - _next/static (static files)
     * - _next/image (image optimization files)
     * - favicon.ico (favicon file)
     * - public files (images, etc.)
     */
    '/((?!_next/static|_next/image|favicon.ico|.*\\..*|public).*)',
  ],
};