Notifier.cs :  » Bloggers » SubText » Subtext » Framework » Tracking » C# / CSharp Open Source

#region Disclaimer/Info

///////////////////////////////////////////////////////////////////////////////////////////////////
// Subtext WebLog
// 
// Subtext is an open source weblog system that is a fork of the .TEXT
// weblog system.
//
// For updated news and information please visit http://subtextproject.com/
// Subtext is hosted at Google Code at http://code.google.com/p/subtext/
// The development mailing list is at subtext@googlegroups.com 
//
// This project is licensed under the BSD license.  See the License.txt file for more information.
///////////////////////////////////////////////////////////////////////////////////////////////////

#endregion

using System;
using System.Collections.Generic;
using System.Web;
using Subtext.Framework.Configuration;
using Subtext.Framework.Logging;
using Subtext.Framework.Text;
using Subtext.Framework.Web;

namespace Subtext.Framework.Tracking{
    /// <summary>
    /// Class used to send a remote notification such as to Weblogs.com or a 
    /// trackback/pingback.
    /// </summary>
    public class Notifier
    {
        static readonly Log Log = new Log();

        public string Description { get; set; }

        public string BlogName { get; set; }

        public string Title { get; set; }

        public string FullyQualifiedUrl { get; set; }

        public Uri PostUrl { get; set; }

        public string Text { get; set; }

        /// <summary>
        /// Notifies the specified state.
        /// </summary>
        /// <param name="state">The state.</param>
        public void Notify(object state)
        {
            try
            {
                Notify();
            }
            catch(Exception e)
            {
                Log.Warn("Had a problem with notification.", e);
            }
        }

        void Notify()
        {
            Configuration.Tracking track = Config.Settings.Tracking;

            //First, ping weblogs.com
            try
            {
                PingWeblogsDotCom(track);
            }
            catch(HttpException e)
            {
                Log.Warn("Had a problem pinging weblogs.com. continuing.", e);
            }

            //Get the links from the last post
            ICollection<string> links = HtmlHelper.GetLinks(Text);

            //Do we have links
            if(links == null || links.Count == 0)
            {
                return;
            }

            //Create our notification Components
            using(var pbnp = new PingBackNotificatinProxy())
            {
                //for each link, try to pingback and/or trackback
                foreach(string link in links)
                {
                    //get the page text
                    Uri url = link.ParseUri();
                    if(url == null)
                    {
                        continue;
                    }

                    string pageText = HttpHelper.GetPageText(url);
                    if(pageText == null || !track.EnableTrackBacks)
                    {
                        continue;
                    }

                    if(track.EnablePingBacks &&
                       !TrackBackNotificationProxy.TrackBackPing(pageText, url, Title, PostUrl, BlogName, Description))
                    {
                        Log.DebugFormat("Trackback failed to '{0}'. Let's try a PingBack.", url);
                        pbnp.Ping(pageText, PostUrl, url);
                    }
                }
            }
        }

        private void PingWeblogsDotCom(Configuration.Tracking track)
        {
            if(track.PingWeblogs)
            {
                using(var weblogs = new WeblogsNotificatinProxy())
                {
                    weblogs.Ping(BlogName, FullyQualifiedUrl);
                }
            }
        }
    }
}