Added support for rel="canonical" meta.

AssemblyVersion.cs

@@ -16,5 +16,5 @@ using System.Reflection;
 //
 // You can specify all the values or you can default the Revision and Build Numbers 
 // by using the '*' as shown below:
-[assembly: AssemblyVersion("3.0.5.609")]
+[assembly: AssemblyVersion("3.0.5.610")]
-[assembly: AssemblyFileVersion("3.0.5.609")]
+[assembly: AssemblyFileVersion("3.0.5.610")]

Core/Tools.cs

@@ -103,6 +103,24 @@ namespace ScrewTurn.Wiki {
 			return buffer.ToString();
 		}
 
+		/// <summary>
+		/// Gets the canonical URL tag for a page.
+		/// </summary>
+		/// <param name="requestUrl">The request URL.</param>
+		/// <param name="currentPage">The current page.</param>
+		/// <param name="nspace">The namespace.</param>
+		/// <returns>The canonical URL, or an empty string if <paramref name="requestUrl"/> is already canonical.</returns>
+		public static string GetCanonicalUrlTag(string requestUrl, PageInfo currentPage, NamespaceInfo nspace) {
+			string url = "";
+			if(nspace == null && currentPage.FullName == Settings.DefaultPage) url = Settings.GetMainUrl().ToString();
+			else url = Settings.GetMainUrl() + "/" + currentPage.FullName + Settings.PageExtension;
+			url = url.Replace("//", "/");
+
+			// Case sensitive
+			if(url == requestUrl) return "";
+			else return "<link rel=\"canonical\" href=\"" + url + "\" />";
+		}
+
 		/// <summary>
 		/// Converts a byte number into a string, formatted using KB, MB or GB.
 		/// </summary>

WebApplication/Default.aspx.cs

@@ -81,6 +81,12 @@ namespace ScrewTurn.Wiki {
 			SetupEmailNotification();
 
 			SetupPageContent(canPostDiscussion, canManageDiscussion);
+
+			if(currentPage != null) {
+				Literal canonical = new Literal();
+				canonical.Text = Tools.GetCanonicalUrlTag(Request.Url.ToString(), currentPage, Pages.FindNamespace(NameTools.GetNamespace(currentPage.FullName)));
+				Page.Header.Controls.Add(canonical);
+			}
 		}
 
 		/// <summary>

WebApplication/MasterPage.master.cs

@@ -17,7 +17,7 @@ using ScrewTurn.Wiki.PluginFramework;
 
 namespace ScrewTurn.Wiki {
 
-    public partial class MasterPage : System.Web.UI.MasterPage {
+	public partial class MasterPage : System.Web.UI.MasterPage {
 
 		private string currentNamespace = null;
 		private PageInfo currentPage = null;
@@ -98,12 +98,12 @@ namespace ScrewTurn.Wiki {
 			Literal c = new Literal();
 			c.Text = h.Replace("######______INCLUDES______######", Tools.GetIncludes(currentNamespace)).Replace("######______NAMESPACE______######", nspace);
 			Page.Header.Controls.Add(c);
-        }
+		}
 
 		/// <summary>
 		/// Prints the header.
 		/// </summary>
-        public void PrintHeader() {
+		public void PrintHeader() {
 			string h = Content.GetPseudoCacheValue(GetPseudoCacheItemName("Header"));
 			if(h == null) {
 				h = FormattingPipeline.FormatWithPhase1And2(Settings.Provider.GetMetaDataItem(MetaDataItem.Header, currentNamespace),
@@ -111,12 +111,12 @@ namespace ScrewTurn.Wiki {
 				Content.SetPseudoCacheValue(GetPseudoCacheItemName("Header"), h);
 			}
 			lblHeaderDiv.Text = FormattingPipeline.FormatWithPhase3(h, FormattingContext.Header, currentPage);
-        }
+		}
 
 		/// <summary>
 		/// Prints the sidebar.
 		/// </summary>
-        public void PrintSidebar() {
+		public void PrintSidebar() {
 			string s = Content.GetPseudoCacheValue(GetPseudoCacheItemName("Sidebar"));
 			if(s == null) {
 				s = FormattingPipeline.FormatWithPhase1And2(Settings.Provider.GetMetaDataItem(MetaDataItem.Sidebar, currentNamespace),
@@ -124,7 +124,7 @@ namespace ScrewTurn.Wiki {
 				Content.SetPseudoCacheValue(GetPseudoCacheItemName("Sidebar"), s);
 			}
 			lblSidebarDiv.Text = FormattingPipeline.FormatWithPhase3(s, FormattingContext.Sidebar, currentPage);
-        }
+		}
 
 		/// <summary>
 		/// Prints the footer.

WebApplication/Print.aspx.cs

@@ -39,9 +39,13 @@ namespace ScrewTurn.Wiki {
 
 			content = Content.GetPageContent(page, true);
 
+			Literal canonical = new Literal();
+			canonical.Text = Tools.GetCanonicalUrlTag(Request.Url.ToString(), page, Pages.FindNamespace(NameTools.GetNamespace(page.FullName)));
+			Page.Header.Controls.Add(canonical);
+
 			Page.Title = FormattingPipeline.PrepareTitle(content.Title, false, FormattingContext.PageContent, page) + " - " + Settings.WikiTitle;
 
-            PrintContent();
+			PrintContent();
 		}
 
 		/// <summary>