MVC Test Throttle Attribute

ThrottleAttribute.cs

namespace Service.ServiceInterface.Utils
{
	using System;
	using System.Net;
	using System.Web;
	using System.Web.Caching;
	using System.Web.Mvc;

	/// <summary>
	/// Decorates any MVC route that needs to have client requests limited by time.
	/// Usage ala [Throttle(Name="TestThrottle", Message = "You must wait {n} seconds before accessing this url again.", Seconds = 5)]
	/// </summary>
	/// <remarks>
	/// Uses the current System.Web.Caching.Cache to store each client request to the decorated route.
	/// </remarks>
	[AttributeUsage(AttributeTargets.Method, AllowMultiple = false)]
	public class ThrottleAttribute : ActionFilterAttribute
	{
		/// <summary>
		/// A unique name for this Throttle.
		/// </summary>
		/// <remarks>
		/// We'll be inserting a Cache record based on this name and client IP, e.g. "Name-192.168.0.1"
		/// </remarks>
		public string Name { get; set; }

		/// <summary>
		/// The number of seconds clients must wait before executing this decorated route again.
		/// </summary>
		public int Seconds { get; set; }

		/// <summary>
		/// A text message that will be sent to the client upon throttling.  You can include the token {n} to
		/// show this.Seconds in the message, e.g. "Wait {n} seconds before trying again".
		/// </summary>
		public string Message { get; set; }

		public override void OnActionExecuting(ActionExecutingContext c)
		{
			var key = string.Concat(Name, "-", c.HttpContext.Request.UserHostAddress);
			var allowExecute = false;

			if (HttpRuntime.Cache[key] == null)
			{
				HttpRuntime.Cache.Add(key,
					true, // is this the smallest data we can have?
					null, // no dependencies
					DateTime.Now.AddSeconds(Seconds), // absolute expiration
					Cache.NoSlidingExpiration,
					CacheItemPriority.Low,
					null); // no callback

				allowExecute = true;
			}

			if (!allowExecute)
			{
				if (String.IsNullOrEmpty(Message))
					Message = "You may only perform this action every {n} seconds.";

				c.Result = new ContentResult { Content = Message.Replace("{n}", Seconds.ToString()) };
				// see 409 - http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
				c.HttpContext.Response.StatusCode = (int)HttpStatusCode.Conflict;
			}
		}
	}
}