Place getServerSideProps function in an helper

Question

I have many pages that I suppose to protect using the firebase admin methods:

const getServerSideProps = async (ctx: GetServerSidePropsContext) => {
  try {
    const cookies = nookies.get(ctx);
    const token = await firebaseAdmin.auth().verifyIdToken(cookies.token);
    const { uid, email } = token;

    return {
      props: {
        email,
        uid,
      },
    };
  } catch (err) {
    return {
      redirect: {
        permanent: false,
        destination: "/",
      },
      props: {} as unknown as never,
    };
  }
};

const ExpertPage = (
  props: InferGetServerSidePropsType<typeof getServerSideProps>,
) => {
  return (
    <Layout type={ILayoutType.EXPERT}>
      <ProtectedPage1 props={props} />
    </Layout>
  );
};

export default ExpertPage;

As you can see, the function getServerSideProps should be called on all those pages, it's something I want to avoid.

I tried to move it in a helper in order to just call it as a type here InferGetServerSidePropsType<typeof getServerSideProps>

But it's not running. I would like to know if there is a better way of doing it.