I'm trying to set up a simple middleware in a luminus project that uses compojure and ring. I'm sure I'm missing something simple, but I've set up a simple middleware to test and I'm not getting the results I expect.
(defn wrap-api-auth [handler]
(if (= 2 2)
(unauthorized {:body "unauthorized"})
handler))
I would expect this to give back a 401, but it keeps returning a 404. If I change the if expressions (= 2 3) the route fires correctly. For reference, here's the route, it's one of the default that luminus generates with the middleware added.
(GET "/plus" []
:return Long
:middleware [wrap-api-auth]
:query-params [x :- Long, {y :- Long 1}]
:summary "x+y with query-parameters. y defaults to 1."
(ok (+ x y)))
A handler is a function from request to response.
A middleware is a function that takes a handler and returns another handler wrapping the first.
Your wrap-api-auth gets called when your service starts up, does its check, and if the check returns true, stores a response as a handler, and then each request gets handled by a constant response instead of a handler. Since a response is a map, and maps in Clojure can be used as functions, this does probably not produce a helpful error but just returns nil, which is then treated as "not found".
Schematically, your wrapper should maybe look like this:
(defn wrap-api-auth [handler]
(fn [request]
(if (check-authorization request)
(handler request) ; pass to wrapped handler
(unauthorized …)))) ; do something else