From 584806af9239154f3af22da3e66a054c2d8e147f Mon Sep 17 00:00:00 2001
From: Tom Hughes <tom@compton.nu>
Date: Fri, 16 Mar 2012 22:38:04 +0000
Subject: [PATCH] Add rel="nofollow" to links generated from Markdown

---
 lib/rich_text.rb | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/lib/rich_text.rb b/lib/rich_text.rb
index 9c4a24fd5..92be8903b 100644
--- a/lib/rich_text.rb
+++ b/lib/rich_text.rb
@@ -71,13 +71,27 @@ module RichText
   private
 
     def html_parser
-      @@html_renderer ||= Redcarpet::Render::XHTML.new({
+      @@html_renderer ||= Renderer.new({
         :filter_html => true, :safe_links_only => true
       })
       @@html_parser ||= Redcarpet::Markdown.new(@@html_renderer, {
         :no_intra_emphasis => true, :autolink => true, :space_after_headers => true
       })
     end
+
+    class Renderer < Redcarpet::Render::XHTML
+      def link(link, title, alt_text)
+        "<a rel=\"nofollow\" href=\"#{link}\">#{alt_text}</a>"
+      end
+
+      def autolink(link, link_type)
+        if link_type == :email
+          "<a rel=\"nofollow\" href=\"mailto:#{link}\">#{link}</a>"
+        else
+          "<a rel=\"nofollow\" href=\"#{link}\">#{link}</a>"
+        end
+      end 
+    end
   end
 
   class Text < Base
-- 
2.43.2