How to authorize an OpenID user on MVC Controller

Question

I'm looking at the [Authorize(Roles = "DefaultUser")] available in MVC, but I can't seem to figure out if I can use it with DotNetOpenAuth.

I'm using OpenID as my sole membership provider, but I have a few generic items in a UserProfile table. I don't want anyone except the appropriate user to be able to access the edit controller.

EXAMPLE:
UserID 2 should not be able to access /Users/Edit/1, but they CAN access /Users/Edit/2

Answer 1

Edit/Rewrite for clearer understanding

public class AdvancedAuthorizeAttribute : AuthorizeAttribute
    {
            public string RouteDataValue
            {
                get;
                set;
            }

            protected override bool AuthorizeCore(HttpContextBase httpContext)
            {
                if(base.AuthorizeCore(httpContext))
                {
                    MvcHandler mvcHandler = httpContext.CurrentHandler as MvcHandler;
                    if (mvcHandler != null)
                    {
                        var paramValue = mvcHandler.RequestContext.RouteData.Values[RouteDataValue];
                        if (paramValue != null)
                        {
                            // Inside this IF-statement is where you'll have to customize for your code.

                            //I use the default user from HttpContext
                            string UserPrincipalName = httpContext.User.Identity.Name;
                            // I use email as login name, and here I try to fetch a user from my repository with that email.
                            User userObject = new Repository<User>().GetOne(x => x.Email == UserPrincipalName);
                            // If I find a user, and that user's UserID is equal to the value in paramValue, it's Ok! Otherwise, not.
                            return (userObject != null && userObject.UserID.ToString() == paramValue.ToString());
                        }
                    }
                }
                return false;
            }
    }

And then, using it:

// Example usage (for instance from UserController)
[AdvancedAuthorize(RouteDataValue="userID")]
public ActionResult Edit(int userID)
{
     // everything as normal
}

[AdvancedAuthorize(RouteDataValue="userEmail")]
public ActionResult Delete(string userEmail)
{
     // everything as normal
}

Of course, for it to work, userID and userEmail in the action examples need to be bound by the modelbinder (the parameters have to exist in the RouteData.Values) for it to work.