MarkItUp.SingleUserBlog/UI/Redirector.cs

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using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Xml;
using System.IO;
using MarkItUp.SingleUserBlog.Common;

namespace MarkItUp.SingleUserBlog.UI {


    /*
     *
     * This class only exists so that I can create Url mappings to pages that are external to my own site.
     *
     * The UrlMappings service that comes with ASP.NET does not allow mappings to external pages.
     * 
     * This Handler is *very* untested so use it at your own peril.  I simply use it to redirect my main RSS feed
     * to my Feedburner feed.  Anything more hard-core than that and it's at your own risk ok! :-)
     *
     */ 

    public class Redirector : IHttpHandler {


        public bool IsReusable {
            get { return false; }
        }

        public void ProcessRequest(HttpContext context) {

            string mappingFile = context.Server.MapPath("~/App_Data/UrlMappings.xml") ;
            if (File.Exists(mappingFile)) {
                XmlDocument xml = new XmlDocument();
                xml.Load(mappingFile);

                Control foo = new Control();
                string rawUrl = context.Request.RawUrl.ToLower() ;

                XmlNodeList mappings = xml.DocumentElement.SelectNodes("//UrlMapping");
  
                for (int i = 0; i < mappings.Count; i++) {
                    string url = foo.ResolveUrl(mappings[i].Attributes["url"].Value).ToLower();

                    if (rawUrl.StartsWith(url)) {
                        string mappedUrl = mappings[i].Attributes["mappedUrl"].Value;
                        context.Response.Redirect(mappedUrl);
                    }
                  
                }
                
            }
        }