using System.Web.Mvc;

namespace MvcApplication.AuthorizedActionLink.Extensions
{
	public static class ActionExtensions
	{
		public static bool ActionAuthorized(this HtmlHelper htmlHelper, string actionName, string controllerName)
		{
			ControllerBase controllerBase = string.IsNullOrEmpty(controllerName) ? htmlHelper.ViewContext.Controller : htmlHelper.GetControllerByName(controllerName);
			ControllerContext controllerContext = new ControllerContext(htmlHelper.ViewContext.RequestContext, controllerBase);
			ControllerDescriptor controllerDescriptor = new ReflectedControllerDescriptor(controllerContext.Controller.GetType());
			ActionDescriptor actionDescriptor = controllerDescriptor.FindAction(controllerContext, actionName);

			if (actionDescriptor == null)
				return false;

			FilterInfo filters = new FilterInfo(FilterProviders.Providers.GetFilters(controllerContext, actionDescriptor));

			AuthorizationContext authorizationContext = new AuthorizationContext(controllerContext, actionDescriptor);
			foreach (IAuthorizationFilter authorizationFilter in filters.AuthorizationFilters)
			{
				authorizationFilter.OnAuthorization(authorizationContext);
				if (authorizationContext.Result != null)
					return false;
			}
			return true;
		}
	}
}