ASP.NET MVC Authorization based on Route Params

My site allows people to edit posts. I want people to only edit their posts. I'd want an authori开发者_如何学Czation attribute like:

[CanEditPost(PostId = Id)]
ActionResult Edit(int Id) { }

But it seems like parameters to attributes have to be static, which makes this impossible. Is there any way to get around this?

---

Yes.

If you create an attribute that inherits from AuthorizeAttribute,

you should be able to access the route parameters by:

protected override bool AuthorizeCore(HttpContextBase httpContext)
{
    var postId = httpContext.Request.RequestContext.RouteData.Values["Id"];
    .
    .
    .
}