Scrum4Me/docs/patterns/middleware.md

Patroon: Middleware (route protection)

// middleware.ts
import { NextResponse } from 'next/server'
import type { NextRequest } from 'next/server'
import { getIronSession } from 'iron-session'
import { SessionData, sessionOptions } from '@/lib/session'

const protectedRoutes = ['/dashboard', '/products', '/todos', '/settings']
const authRoutes = ['/login', '/register']

export async function middleware(request: NextRequest) {
  const response = NextResponse.next()
  const session = await getIronSession<SessionData>(request.cookies, sessionOptions)

  const isProtected = protectedRoutes.some(r => request.nextUrl.pathname.startsWith(r))
  const isAuthRoute = authRoutes.some(r => request.nextUrl.pathname.startsWith(r))

  if (isProtected && !session.userId) {
    return NextResponse.redirect(new URL('/login', request.url))
  }
  if (isAuthRoute && session.userId) {
    return NextResponse.redirect(new URL('/dashboard', request.url))
  }

  return response
}

export const config = {
  matcher: ['/((?!api|_next/static|_next/image|favicon.ico).*)'],
}