Custom ActionFilter to check the existence of the parametre in Database

Question

Hi there I am looking for a solution to solve this problem.I am building an Web app with Asp.net mvc3. I want to make a custom Action Filter ([KeyAuthorization]) so that only authorized key will access the controllers.

This is my default Route

routes.MapRoute(
                "Default", // Route name
               "{guid}/{controller}/{action}", // URL with parameters
               new { guid = UrlParameter.Optional, controller = "Home", action = "Index", }

So let say someone access the www.example.com/34safd-234s/home/index

if key:34safd-234s is correct (authorized) than the user will see the content otherwise the web app will throw an 404.

How can achieve this?

Thank you,

How can I build and action filter that checkes that guid parametre exist in the

Answer 1

You can do it by creating an ActionFilterAttribute. This should get you going in the right direction. You'll need to do your validation where commented.

public class KeyAuthorizationAttribute : ActionFilterAttribute {
    public override void OnActionExecuting(ActionExecutingContext filterContext) {
        var guidValue = filterContext.RouteData.Values["guid"];
        if (guidValue != null) {
            Guid guid = new Guid(guidValue.ToString());
            bool notValid = true;
            //do validation
            //set notValid = false if authorization passes             

            if (notValid) {
                filterContext.Result = new HttpNotFoundResult();
            }
        }
    }
}

You would then apply this to your action.

[KeyAuthorization]
public ActionResult Index() {
}