confessions-of-grace/utils/supabase/middleware.ts

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

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

  const supabase = createServerClient(
    process.env.NEXT_PUBLIC_SUPABASE_URL!,
    process.env.NEXT_PUBLIC_SUPABASE_PUBLISHABLE_DEFAULT_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)
          );
        },
      },
    }
  );

  // Refresh the session
  const {
    data: { user },
  } = await supabase.auth.getUser();

  // Protect admin routes (except login)
  const isAdminRoute = request.nextUrl.pathname.startsWith("/admin");
  const isLoginPage = request.nextUrl.pathname === "/admin/login";

  if (isAdminRoute && !isLoginPage) {
    if (!user) {
      const url = request.nextUrl.clone();
      url.pathname = "/admin/login";
      return NextResponse.redirect(url);
    }

    // Verify the user is in admin_users table
    const { data: adminUser } = await supabase
      .from("admin_users")
      .select("role")
      .eq("user_id", user.id)
      .single();

    if (!adminUser) {
      const url = request.nextUrl.clone();
      url.pathname = "/admin/login";
      return NextResponse.redirect(url);
    }
  }

  // If logged-in admin visits login page, redirect to dashboard
  if (isLoginPage && user) {
    const { data: adminUser } = await supabase
      .from("admin_users")
      .select("role")
      .eq("user_id", user.id)
      .single();

    if (adminUser) {
      const url = request.nextUrl.clone();
      url.pathname = "/admin";
      return NextResponse.redirect(url);
    }
  }

  return supabaseResponse;
}