What im trying to accomplish:

I want to route requests to media to a controller action where i can authenticate the user.

What i've tried so far:

I've looked on the web but i've come up empty handed. I tried adding a route in the routetable (both a normal MVC one and an umbraco one) but neither of them would make the request to media actually go to the controller/action specified.

Is it at all possible to create this kind of routing?