Add global trackback disable setting. Closes #860

git-svn-id: http://svn.typosphere.org/typo/trunk@1142 820eb932-12ee-0310-9ca8-eeb645f39767

app/models/blog.rb

@@ -54,6 +54,7 @@ def before(date = Time.now)
   setting :show_extended_on_rss,       :boolean, true
   setting :theme,                      :string, 'azure'
   setting :use_gravatar,               :boolean, false
+  setting :global_pings_disable,       :boolean, false
   setting :ping_urls,                  :string, "http://rpc.technorati.com/rpc/ping\nhttp://ping.blo.gs/\nhttp://rpc.weblogs.com/RPC2"
   setting :send_outbound_pings,        :boolean, true
   setting :email_from,                 :string, 'typo@example.com'

app/models/trackback.rb

@@ -43,6 +43,9 @@ def process_trackback
 
   def article_is_pingable
     return if article.nil?
+    if blog.global_pings_disable
+      errors.add(:article, "Pings are disabled")
+    end
     unless article.allow_pings?
       errors.add(:article, "Article is not pingable")
     end

app/views/admin/general/index.rhtml

@@ -78,6 +78,22 @@
 
     <hr/>
 
+    <p>This setting allows you to disable trackbacks for every article in
+	your blog.  It won't remove existing trackbacks, but it will prevent
+	any further attempt to add a trackback anywhere on your blog.  You can
+	enable or disable trackbacks per-article using the article's extended
+	settings.  See also the 
+      <a href="#gensettings" onclick="new Effect.ScrollTo('gensettings'); return false">"Enable Trackbacks by default" setting</a> above.
+	</p>
+    <p>
+      <input name="setting[global_pings_disable]" id="global_pings_disable" type="checkbox" value="1" <%= 'checked="checked"' if this_blog.global_pings_disable%> />
+         <input name="setting[global_pings_disable]" type="hidden" value="0"/>
+           <label for="global_pings_disable">Disable trackbacks site-wide</label>
+
+    </p>
+
+    <hr />
+
     <p>Should Typo send trackbacks to websites that you link to?  This should be disabled
        for private blogs, as it will leak non-public information to sites that you're discussing.
        For public blogs, there's no real point in disabling this.</p>