How to handle unregistered users?

export async function login() {
  "use server";

  const supabase = await createClient();
  const header = await headers();
  const origin = header.get("origin");

  const { data, error } = await supabase.auth.signInWithOAuth({
    provider: "google",
    options: {
      queryParams: {
        access_type: "offline",
        prompt: "consent",
      },
      redirectTo: `${origin}/auth/callback`,
    },
  });

  if (error) {
    console.log(error);
    redirect("/auth/error");
  }

  console.log(data);
  redirect(data.url);
}

export async function updateSession(request: NextRequest) {
  // ...

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

  const publicRoutes = ["/", "/auth/login", "/auth/logout", "/auth/error"];
  const isPublicRoute = publicRoutes.includes(request.nextUrl.pathname);

  if (!user && !isPublicRoute) {
    // no user, potentially respond by redirecting the user to the login page
    const url = request.nextUrl.clone();
    url.pathname = "/auth/login";
    return NextResponse.redirect(url);
  }

  return supabaseResponse;
}