correct hack and move to oneboxer

lib/cooked_post_processor.rb

@@ -245,19 +245,7 @@ class CookedPostProcessor
     }
 
     # apply oneboxes
-    Oneboxer.apply(@doc) { |url|
-
-      # hack urls to create proper expansions
-      if url =~ Regexp.new("^#{Discourse.base_url.gsub(".","\\.")}.*$", true)
-        uri = URI.parse(url) rescue nil
-        if uri && uri.path
-          route = Rails.application.routes.recognize_path(uri.path) rescue nil
-          if route && route[:controller] == 'topics'
-            url += (url =~ /\?/ ? "&" : "?") + "&source_topic_id=#{@post.topic_id}"
-          end
-        end
-      end
-
+    Oneboxer.apply(@doc, topic_id: @post.topic_id) { |url|
       Oneboxer.onebox(url, args)
     }