Validating routes in search params

[ldhwaddell]

Is there a preferred way of guaranteeing that a passed search param is a valid route? I am interested in passing a callback URL through the search params to be used as a redircet for the user if authentication is a success.

If I just wanted to ensure a string was passed, it would be easy enough to do:

const CallbackUrlSchema = z.object({
  // How can we determine a valid path has been passed?
  callbackURL: fallback(z.string().min(2), "").default(""),
});

export const Route = createFileRoute("/(auth)/sign-in")({
  component: RouteComponent,
  validateSearch: zodValidator(CallbackUrlSchema),
  search: {
    middlewares: [stripSearchParams({ callbackURL: "" })],
  },
});

function RouteComponent() {
  const { callbackURL } = Route.useSearch();

 // Authenticate and redirect to callbackURL