Supabase auth FE->BE exchange

be.ts

import { createClient, type Session } from "@supabase/supabase-js";

async onAuthenticate({ token }: onAuthenticatePayload) {
  const session = JSON.parse(token) as Pick<
    Session,
    "access_token" | "refresh_token"
  >;
  const {
    data: { user },
    error,
  } = await this.client.auth.setSession(session);
  if (error) {
    console.error(error);
    throw new Error("Not authenticated.");
  }
  return user;
}

fe.ts

export const getAuthToken = cache(async () => {
  const supabase = await supabaseClient();
  const {
    data: { session },
    error,
  } = await supabase.auth.getSession();
  if (error) {
    console.error(error);
    return { error };
  }
  if (!session) {
    return { token: null };
  }
  const { access_token, refresh_token } = session;
  const token = JSON.stringify({
    access_token,
    refresh_token,
  });
  return { token };
});