OAuth Callback Handler and Returns auth_code

[SharkGW]

Currently, there is no built-in function in the auth-py library to handle OAuth callback process. This feature would significantly improve the developer experience for those using supabase.auth to manage custom login/signup flows in backend frameworks like FastAPI.

Example Implementation:

async def exchange_params_for_auth_code(params):
    try:
        async with httpx.AsyncClient() as client:
            response = await client.get(
                f"{settings.SUPABASE_URL}/auth/v1/callback",
                headers={"Content-Type": "application/json"},
                params=params.model_dump()
            )
            
        if response.status_code != 302:
            raise AuthApiError(code="invalid_request", message="Invalid response", status=400)
            
        redirect_url = response.headers.get('Location')
        if not redirect_url:
            raise AuthApiError(code="invalid_request", message="No redirect URL found", status=400)
            
        parsed_redirect = urlparse(redirect_url)
        code = parse_qs(parsed_redirect.query).get('code', [None])[0]
        if not code:
            raise AuthApiError(code="invalid_request", message="No code found in URL", status=400)
            
        return OAuthCallbackResponse(code=code)
        
    except Exception as e:
        raise AuthApiError(code="internal_server_error", message="Internal server error", status=500)

[silentworks]

Not sure what you mean here, this works the same as it does in the Javascript server side frameworks. You need to setup your redirect_to url and the endpoint to do the exchange for you. There is a Flask example here but it's more or less the same with FastAPI, the OAuth call https://github.com/silentworks/flask-notes/blob/main/app/auth.py#L32-L40 and the callback endpoint https://github.com/silentworks/flask-notes/blob/main/app/auth.py#L107-L115