MVC Dynamic Page Permissions Using Authorize Attribute?

I'm working on setting up my user permissions for my company's site, and we have several different roles and permissions that will have to be created. I have found some awesome information on creating the actual roles and groups, as well as how to implement them from here. However, this still requires the roles to be hard-coded into the authorize tag, is there a way to dynamically populate the authorize tag, so that I can have a page on the site that I can quickly assign different permissions to different pages, without having to just back into the code and modify the permission set for every single page I create?

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Implement the following custom authorise attribute.

public class CustomAuthorizeAttribute : AuthorizeAttribute
    {
        public CustomAuthorizeAttribute (params string[] roleKeys) 
        {
            var roles = new List<string>();
            var allRoles = (NameValueCollection)ConfigurationManager.GetSection("CustomRoles");
            foreach(var roleKey in roleKeys) {
                roles.AddRange(allRoles[roleKey].Split(new []{','}));
            }

            Roles = string.Join(",", roles);
        }

        public override void OnAuthorization(AuthorizationContext filterContext)
        {
            base.OnAuthorization(filterContext);
            if (filterContext.Result is HttpUnauthorizedResult)
            {
                filterContext.Result = new RedirectResult("~/Error/AcessDenied");
            }
        }
    }

Then add the following to the web.config

<section name="CustomRoles" type="System.Configuration.NameValueFileSectionHandler,System, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />

and then, as an example

 <CustomRoles>
    <add key="UsersPagePermission" value="HR,Accounts,Developers" /> 
  </CustomRoles>

The on your controller or action or in the global filters (whichever you prefer :)) add the attribute

eg

[CustomAuthorize("UsersPagePermission")]
public class UserController : Controller

This will allow you to modify the web.config rather than code to change permissions.

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