/BlogEngine/DotNetSlave.BusinessLogic/Ping/Trackback.cs

namespace BlogEngine.Core.Ping

{

    using System;

    using System.IO;

    using System.Net;



    /// <summary>

    /// The trackback.

    /// </summary>

    public static class Trackback

    {

        #region Events



        /// <summary>

        ///     Occurs just before a trackback is sent.

        /// </summary>

        public static event EventHandler<EventArgs> Sending;



        /// <summary>

        ///     Occurs when a trackback has been sent

        /// </summary>

        public static event EventHandler<EventArgs> Sent;



        #endregion



        #region Public Methods



        /// <summary>

        /// The send.

        /// </summary>

        /// <param name="message">

        /// </param>

        /// <returns>

        /// The send.

        /// </returns>

        public static bool Send(TrackbackMessage message)

        {

            if (!BlogSettings.Instance.EnableTrackBackSend)

            {

                return false;

            }



            if (message == null)

            {

                throw new ArgumentNullException("message");

            }



            OnSending(message.UrlToNotifyTrackback);



            // Warning:next line if for local debugging porpuse please donot remove it until you need to

            // tMessage.PostURL = new Uri("http://www.artinsoft.com/webmaster/trackback.html");

            var request = (HttpWebRequest)WebRequest.Create(message.UrlToNotifyTrackback);

                

                // HttpHelper.CreateRequest(trackBackItem);

            request.Credentials = CredentialCache.DefaultNetworkCredentials;

            request.Method = "POST";

            request.ContentLength = message.ToString().Length;

            request.ContentType = "application/x-www-form-urlencoded";

            request.KeepAlive = false;

            request.Timeout = 10000;



            using (var writer = new StreamWriter(request.GetRequestStream()))

            {

                writer.Write(message.ToString());

            }



            bool result;

            HttpWebResponse response;

            try

            {

                response = (HttpWebResponse)request.GetResponse();

                OnSent(message.UrlToNotifyTrackback);

                string answer;

                using (var sr = new StreamReader(response.GetResponseStream()))

                {

                    answer = sr.ReadToEnd();

                }



                // TODO: This could be a strict XML parsing if necesary/maybe logging activity here too

                result = response.StatusCode == HttpStatusCode.OK && answer.Contains("<error>0</error>");

            }

            catch

            {

                // (WebException wex)

                result = false;

            }



            return result;

        }



        #endregion



        #region Methods



        /// <summary>

        /// Called when [sending].

        /// </summary>

        /// <param name="url">The URL.</param>

        private static void OnSending(Uri url)

        {

            if (Sending != null)

            {

                Sending(url, new EventArgs());

            }

        }



        /// <summary>

        /// Called when [sent].

        /// </summary>

        /// <param name="url">The URL.</param>

        private static void OnSent(Uri url)

        {

            if (Sent != null)

            {

                Sent(url, new EventArgs());

            }

        }



        #endregion

    }

}