How do I get and set cookies in middleware? (For use in Supabase auth)

export class AuthMiddleware extends HttpApiMiddleware.Tag<AuthMiddleware>()(
  "@repo/middleware/AuthMiddleware",
  {
    provides: ActorContext,
    failure: AuthError,
  },
) {}

export const AuthMiddlewareLayer = Layer.effect(
  AuthMiddleware,
  Effect.gen(function* () {
    yield* Effect.log("AuthMiddleware running");


    const supabase = createServerClient(
      Redacted.value(yield* Config.redacted("NEXT_PUBLIC_SUPABASE_URL")),
      Redacted.value(yield* Config.redacted("SUPABASE_SERVICE_ROLE_KEY")),
      {
        cookies: {
          getAll: () => {
            /* return req.headers.cookies */
          },
          setAll: (cookies) => {
            /* I could maybe refresh the cookies in a nextjs proxy instead if thats easier */
            /* for cookie in cookies: setCookie */
          },
        },
      },
    );

  ...
  const {data: {user}} = yield* Effect.tryPromise(supabase.auth.getuser())

  if (!user) {
    return Effect.succeed(new PublicActor());
  }
  return Effect.succeed(
    new UserActor({ userId: UserIdSchema.make(user.id) }),
  );
  ...

const req = yield* HttpServerRequest.HttpServerRequest;
const cookies = req.headers.cookies;