Function authenticate_from_request

pub fn authenticate_from_request<T>(
    firebase_auth: &FirebaseAuth,
    req: &Request<T>,
) -> Result<Option<FirebaseUser>, String>

Extracts an authenticated user from an HTTP request.

Note that the firebase_auth crate has an Axum feature with similar functionality, but we don’t use it because it doesn’t integrate well with the RPC service.