The AuthorizationContext (parameter to OnAuthorize) provides access to the Controller, RouteData, HttpContext, etc. You should be able to use these in a custom authorization filter to do what you want. Below is a sample of code from a RoleOrOwnerAttribute derived from AuthorizeAttribute.
If the authorization is really that dynamic, I would handle it in the controller. I have one action where I do this - you can return a HttpUnauthorizedResult to redirect to the login page or you can show a custom error in your view.
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