Web.Routing - backward compatibility with legacy NotFoundHandler

src/Umbraco.Web/Routing/NotFoundHandlerHelper.cs

@@ -0,0 +1,73 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Web;
+
+namespace Umbraco.Web.Routing
+{
+	// provides internal access to legacy url -- should get rid of it eventually
+	internal static class NotFoundHandlerHelper
+	{
+		const string ContextKey = "Umbraco.Web.Routing.NotFoundHandlerHelper.Url";
+
+		public static string GetLegacyUrlForNotFoundHandlers()
+		{
+			// that's not backward-compatible because when requesting "/foo.aspx"
+			// 4.9  : url = "foo.aspx"
+			// 4.10 : url = "/foo"
+			//return pcr.Uri.AbsolutePath;
+
+			// so we have to run the legacy code for url preparation :-(
+
+			var httpContext = HttpContext.Current;
+
+			if (httpContext == null)
+				return "";
+
+			var url = httpContext.Items[ContextKey] as string;
+			if (url != null)
+				return url;
+
+			// code from requestModule.UmbracoRewrite
+			string tmp = httpContext.Request.Path.ToLower();
+
+			// note: requestModule.UmbracoRewrite also does some confusing stuff
+			// with stripping &umbPage from the querystring?! ignored.
+
+			// code from requestHandler.cleanUrl
+			string root = Umbraco.Core.IO.SystemDirectories.Root.ToLower();
+			if (!string.IsNullOrEmpty(root) && tmp.StartsWith(root))
+				tmp = tmp.Substring(root.Length);
+			tmp = tmp.TrimEnd('/');
+			if (tmp == "/default.aspx")
+				tmp = string.Empty;
+			else if (tmp == root)
+				tmp = string.Empty;
+
+			// code from UmbracoDefault.Page_PreInit
+			if (tmp != "" && httpContext.Request["umbPageID"] == null)
+			{
+				string tryIntParse = tmp.Replace("/", "").Replace(".aspx", string.Empty);
+				int result;
+				if (int.TryParse(tryIntParse, out result))
+					tmp = tmp.Replace(".aspx", string.Empty);
+			}
+			else if (!string.IsNullOrEmpty(httpContext.Request["umbPageID"]))
+			{
+				int result;
+				if (int.TryParse(httpContext.Request["umbPageID"], out result))
+				{
+					tmp = httpContext.Request["umbPageID"];
+				}
+			}
+
+			// code from requestHandler.ctor
+			if (tmp != "")
+				tmp = tmp.Substring(1);
+
+			httpContext.Items[ContextKey] = tmp;
+			return tmp;
+		}
+	}
+}