How do you get the session in middleware?

import { decode } from "next-auth/jwt";

 const cookieName = "__Secure-next-auth.session-token";
  const token = request.cookies.get(cookieName)?.value;
  const currentUrl = request.nextUrl.pathname;

  if (!token) return NextResponse.redirect(new URL("/login", request.url));

  const decryptedToken = (await decode({
    token,
    secret: env.NEXTAUTH_SECRET!,
  })) as unknown as Session["user"];