Wasp-lang•6d ago

Redirect user if authenticated?

Is there a way to do a server-side redirect if the user is authenticated? i.e: if a user is logged in, I do not want them to be able to go to the /login page, and should instead be redirected back to their /dashboard . I'm aware I can do this with a client-side check on the useAuth() object, but that would still enable a single render of the "gated" content before redirecting (i.e if using a useEffect()). Is there a way to configure some whenAuthenticated guard in the main.wasp?

3 Replies

kapa.ai•6d ago

Hi @Prefix. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- Based on the provided knowledge sources, there isn't a direct way to configure a server-side redirect for authenticated users in Wasp as you've described. However, I can provide some insights and potential workarounds: 1. Currently, Wasp provides an authRequired property for pages, which redirects unauthenticated users to a login page. This is the opposite of what you're looking for. Protecting a page with authRequired (https://wasp-lang.dev/docs/auth/overview#protecting-a-page-with-authrequired) 2. There is an open GitHub issue discussing this exact problem. Users can still visit /signup and /login pages even when logged in. GitHub Issue #402 (https://github.com/wasp-lang/wasp/issues/402) 3. Wasp does have an onAuthSucceededRedirectTo field, but it only works for redirecting after a successful login/signup, not for already authenticated users. Auth Fields Documentation (https://wasp-lang.dev/docs/auth/overview#onauthsucceededredirectto-string) 4. As you mentioned, the current workaround is to use client-side checks with useAuth(), but this does have the drawback of a brief render of the gated content. 5. There's an ongoing discussion about improving the auth middleware behavior, which might address this issue in the future. GitHub Issue #1133 (https://github.com/wasp-lang/wasp/issues/1133) Unfortunately, there isn't a built-in whenAuthenticated guard or similar feature in main.wasp at the moment. The closest thing is the authRequired flag, but it works in the opposite direction of what you need. For now, the client-side check remains the most straightforward solution, despite its limitations. You might want to consider adding your use case to the existing GitHub issues or creating a new one to help shape future improvements to Wasp's auth system. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ---------------------- Sorry @Prefix, I seem to be having a bit of trouble. Don't worry though, I've pinged my support and they will try to fix me up! :technologist: Perhaps try again in 15mins?

Joaquim•6d ago

I would not run anything inside a useEffect. Take the user and the loading status from useAuth. If it's loading return a loading screen. If it's not authenticated, return null and navigate to the page you want I have something like this in my app

const navigate = useNavigate();
const location = useLocation();
const { data: user, isLoading: userIsLoading } = useAuth();

if (userIsLoading) {
  return null;
}

if (user && (location.pathname === "/" || location.pathname === "/login")) {
  navigate("/indices", { replace: true });
  return null;
}

const navigate = useNavigate();
const location = useLocation();
const { data: user, isLoading: userIsLoading } = useAuth();

if (userIsLoading) {
  return null;
}

if (user && (location.pathname === "/" || location.pathname === "/login")) {
  navigate("/indices", { replace: true });
  return null;
}

It's encouraged in the react docs to run state changes during render if you guarantee that it only runs once. It prevents the useEffect delay

miho•5d ago

Wasp is a full stack app consisting of a client (single page app) and a server (API) - the client is just an index.html and not server side rendered, so the control is 100% in the browser. This is why server side redirects are not possible, you have to do them on the client. I usually do what you did, use useAuth and then decide with an if statement if I want to navigate or stay on the current page.

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Redirect user if authenticated?