/BlogEngine/BlogEngine.NET/App_Code/Extensions/StopForumSpam.cs

namespace App_Code.Extensions

{

    using System;

    using System.IO;

    using System.Net;



    using BlogEngine.Core;



    /// <summary>

    /// StopForumSpam.com custom comment filter

    /// </summary>

    public class StopForumSpam : ICustomFilter

    {

        #region Constants and Fields



        /// <summary>

        /// The pass through.

        /// </summary>

        private bool passThrough = true;



        #endregion



        #region Properties



        /// <summary>

        ///     Gets a value indicating whether comment will be passed to other

        ///     custom filters for validation

        /// </summary>

        public bool FallThrough

        {

            get

            {

                return passThrough;

            }

        }



        #endregion



        #region Implemented Interfaces



        #region ICustomFilter



        /// <summary>

        /// Check if comment is spam

        /// </summary>

        /// <param name="comment">

        /// The comment

        /// </param>

        /// <returns>

        /// True if comment is spam

        /// </returns>

        public bool Check(Comment comment)

        {

            try

            {

                var url = string.Format("http://www.stopforumspam.com/api?ip={0}", comment.IP);



                var request = (HttpWebRequest)WebRequest.Create(url);

                var response = (HttpWebResponse)request.GetResponse();

                var responseStream = response.GetResponseStream();

                if (responseStream != null)

                {

                    var reader = new StreamReader(responseStream);



                    var value = reader.ReadToEnd();

                    reader.Close();



                    var spam = value.ToLowerInvariant().Contains("<appears>yes</appears>") ? true : false;



                    // if comment IP appears in the stopforumspam list

                    // it is for sure spam; no need to pass to others.

                    passThrough = spam ? false : true;



                    return spam;

                }

            

                return false;

            }

            catch (Exception e)

            {

                Utils.Log(string.Format("Error checking stopforumspam.com: {0}", e.Message));

                return false;

            }

        }



        /// <summary>

        /// Enables or disables filter

        /// </summary>

        /// <returns>

        /// True of false

        /// </returns>

        public bool Initialize()

        {

            // do not need any initialization

            // simply return true to enable filter

            return true;

        }



        /// <summary>

        /// Report mistakes to service

        /// </summary>

        /// <param name="comment">

        /// A Comment.

        /// </param>

        public void Report(Comment comment)

        {

            // if we needed report mistakes back to

            // service, we would put code here

        }



        #endregion



        #endregion

    }

}