sitecore-alias-redirect-resolver

AliasRedirectResolver.cs

using Sitecore;
using Sitecore.Configuration;
using Sitecore.Diagnostics;
using Sitecore.Pipelines.HttpRequest;
using System.Net;
using System.Web;
using AliasResolver = Sitecore.Pipelines.HttpRequest.AliasResolver;

namespace LaunchSitecore.Configuration.AuthoringExperience.Processors
{
    /// <summary>
    /// Pipeline modification to turn Aliases into 301 redirects
    /// </summary>
    public class AliasRedirectResolver : AliasResolver
    {
        public override void Process(HttpRequestArgs args)
        {
            if (!Settings.AliasesActive)
            {
                return; // if aliases aren't active, we really shouldn't confuse whoever turned them off
            }

            var database = Context.Database;

            if (database == null)
            {
                return; // similarly, if we don't have a database, we probably shouldn't try to do anything
            }

            var targetID = Context.Database.Aliases.GetTargetID(args.LocalPath);

            // sanity checks for the item
            if (targetID.IsNull)
            {
                Tracer.Error("An alias for \"" + args.LocalPath + "\" exists, but points to a non-existing item.");
                return;
            }
            var item = args.GetItem(targetID);

            if (database.Aliases.Exists(args.LocalPath))
            {

                if (item != null)
                {
                    if (Context.Item == null)
                    {
                        Context.Item = item;
                        Tracer.Info(string.Concat("Using alias for \"", args.LocalPath, "\" which points to \"", item.ID, "\""));
                    }

                    HttpContext.Current.Response.RedirectLocation = item.Paths.FullPath.ToLower()
                        .Replace(Context.Site.StartPath.ToLower(), string.Empty);
                    HttpContext.Current.Response.StatusCode = (int) HttpStatusCode.MovedPermanently;
                    HttpContext.Current.Response.StatusDescription = "301 Moved Permanently";
                    HttpContext.Current.Response.End();
                }
            }
        }
    }
}