Fixed caching of RSS feeds; changed from caches_page to caches_action to make authentication and other filters work

app/controllers/application.rb

@@ -2,7 +2,7 @@
 # Likewise will all the methods added be available for all controllers.
 class ApplicationController < ActionController::Base
 
-  before_filter :set_utf8_http_header, :connect_to_model, :setup_url_generator
+  before_filter :connect_to_model, :setup_url_generator, :set_content_type_header
   after_filter :remember_location, :teardown_url_generator
 
   observer :page_observer
@@ -144,8 +144,12 @@ class ApplicationController < ActionController::Base
     end
   end
 
-  def set_utf8_http_header
-    @response.headers['Content-Type'] = 'text/html; charset=UTF-8'
+  def set_content_type_header
+    if %w(rss_with_content rss_with_headlines).include?(action_name)
+      @response.headers['Content-Type'] = 'text/xml; charset=UTF-8'
+    else
+      @response.headers['Content-Type'] = 'text/html; charset=UTF-8'
+    end
   end
 
   def setup_url_generator

app/controllers/revision_sweeper.rb

@@ -16,9 +16,12 @@ class RevisionSweeper < ActionController::Caching::Sweeper
   private
   
   def expire_caches(page)
-    expire_page :controller => 'wiki', :web => page.web.address,
+    web = page.web
+    expire_action :controller => 'wiki', :web => web.address,
         :action => %w(show published), :id => page.name
-    expire_page :controller => 'wiki', :web => page.web.address,
-        :action => %w(authors recently_revised list rss_with_content rss_with_headlines)
+    expire_action :controller => 'wiki', :web => web.address,
+        :action => %w(authors recently_revised list)
+    expire_fragment :controller => 'wiki', :web => web.address,
+        :action => %w(rss_with_headlines rss_with_content)
   end
 end

app/controllers/wiki_controller.rb

@@ -6,7 +6,7 @@ require 'zip/zip'
 class WikiController < ApplicationController
 
   # TODO implement cache sweeping
-  caches_page :show, :published, :authors, :recently_revised, :list, :rss_with_content, :rss_with_headlines
+  caches_action :show, :published, :authors, :recently_revised, :list
   cache_sweeper :revision_sweeper
 
   layout 'default', :except => [:rss_feed, :rss_with_content, :rss_with_headlines, :tex,  :export_tex, :export_html]
@@ -330,10 +330,9 @@ class WikiController < ApplicationController
     end
     
     @hide_description = hide_description
-    @response.headers['Content-Type'] = 'text/xml'
     @link_action = @web.password ? 'published' : 'show'
     
-    render 'wiki/rss_feed'
+    render :action => 'rss_feed'
   end
 
   def render_tex_web

app/views/wiki/rss_feed.rhtml

@@ -1,22 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/">
-	<channel>
-		<title><%= @web.name %></title>
-		<link><%= url_for :only_path => false, :web => @web_name, :action => @link_action, :id => 'HomePage' %></link>
-		<description>An Instiki wiki</description>
-		<language>en-us</language>
-		<ttl>40</ttl>
-  <% for page in @pages_by_revision %>
-    <item>
-      <title><%= h page.plain_name %></title>
-    <% unless @hide_description %>
-      <description><%= h rendered_content(page) %></description>
-    <% end %>
-      <pubDate><%= page.revised_at.getgm.strftime "%a, %d %b %Y %H:%M:%S Z" %></pubDate>
-      <guid><%= url_for :only_path => false, :web => @web_name, :action => @link_action, :id => page.name %></guid>
-      <link><%= url_for :only_path => false, :web => @web_name, :action => @link_action, :id => page.name %></link>
-      <dc:creator><%= WikiWords.separate(page.author) %></dc:creator>
-    </item>
-  <% end %>
-  </channel>
-</rss>

app/views/wiki/rss_feed.rxml

@@ -0,0 +1,21 @@
+xml.rss('version' => '2.0') do
+  xml.channel do
+    xml.title(@web.name)
+    xml.link(url_for(:only_path => false, :web => @web_name, :action => @link_action, :id => 'HomePage'))
+    xml.description('An Instiki wiki')
+    xml.language('en-us')
+    xml.ttl('40')
+
+    for page in @pages_by_revision
+      xml.item do
+        xml.title(page.plain_name)
+        unless @hide_description
+          xml.description(rendered_content(page))
+        end
+        xml.pubDate(page.revised_at.getgm.strftime('%a, %d %b %Y %H:%M:%S Z'))
+        xml.guid(url_for(:only_path => false, :web => @web_name, :action => @link_action, :id => page.name))
+        xml.link(url_for(:only_path => false, :web => @web_name, :action => @link_action, :id => page.name))
+      end
+    end
+  end
+end