c# - Custom authorizations in Web.API

Question

My understanding of ASP.NET MVC is that for authorizations I should use something like -

public class IPAuthorize : AuthorizeAttribute {

protected override bool AuthorizeCore(HttpContextBase httpContext) {
    //figure out if the ip is authorized 
    //and return true or false
}

But in Web API, there is no AuthorizeCore(..).

There is OnAuthorization(..) and the general advice for MVC is not to use OnAuthorization(..).

What should I use for custom authorizations in Web API?

Answer 1

Authorization is done in an authorization filter - that mean you derive from System.Web.Http.AuthorizeAttribute and implement the IsAuthorized method.

You don't implement authorization in a normal action filter because they run later in the pipeline than authorization filters.

You also don't implement authentication in a filter (like parsing a JWT) - this is done even earlier in an extensibility point called MessageHandler.