middleware.ts

import { createServerClient } from "@supabase/ssr";
import { NextResponse, type NextRequest } from "next/server";

export async function middleware(request: NextRequest) {
  let supabaseResponse = NextResponse.next({
    request,
  });

  const supabase = createServerClient(
    process.env.NEXT_PUBLIC_SUPABASE_URL!,
    process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!,
    {
      cookies: {
        getAll() {
          return request.cookies.getAll();
        },
        setAll(cookiesToSet) {
          cookiesToSet.forEach(({ name, value }) =>
            request.cookies.set(name, value)
          );
          supabaseResponse = NextResponse.next({
            request,
          });
          cookiesToSet.forEach(({ name, value, options }) =>
            supabaseResponse.cookies.set(name, value, options)
          );
        },
      },
    }
  );

  // This will refresh session if expired - required for Server Components
  // https://supabase.com/docs/guides/auth/server-side/nextjs
  const {
    data: { user },
  } = await supabase.auth.getUser();

  // Protected routes
  const protectedRoutes = ["/feed", "/create"];
  const authRoutes = ["/signin", "/signup", "/reset-password"];

  const isProtectedRoute = protectedRoutes.some((route) =>
    request.nextUrl.pathname.startsWith(route)
  );

  const isAuthRoute = authRoutes.some((route) =>
    request.nextUrl.pathname.startsWith(route)
  );

  // Redirect unauthenticated users away from protected routes
  if (isProtectedRoute && !user) {
    const url = request.nextUrl.clone();
    url.pathname = "/signin";
    return NextResponse.redirect(url);
  }

  // Redirect authenticated users away from auth routes
  if (isAuthRoute && user) {
    const url = request.nextUrl.clone();
    url.pathname = "/feed";
    return NextResponse.redirect(url);
  }

  return supabaseResponse;
}

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)
     */
    "/((?!_next/static|_next/image|favicon.ico|.*\\.(?:svg|png|jpg|jpeg|gif|webp)$).*)",
  ],
};