Event hooks for before and after site_notice

EVENTS.txt

@@ -150,6 +150,12 @@ StartAddressData: Allows the site owner to provide additional information about
 EndAddressData: At the end of <address>
 - $action: the current action
 
+StartShowSiteNotice: Before showing site notice
+- $action: the current action
+
+EndShowSiteNotice: After showing site notice
+- $action: the current action
+
 StartLoginGroupNav: Before showing the login and register navigation menu
 - $action: the current action
 

lib/action.php

@@ -369,7 +369,11 @@ class Action extends HTMLOutputter // lawsuit
         $this->elementStart('div', array('id' => 'header'));
         $this->showLogo();
         $this->showPrimaryNav();
-        $this->showSiteNotice();
+        if (Event::handle('StartShowSiteNotice', array($this))) {
+            $this->showSiteNotice();
+
+            Event::handle('EndShowSiteNotice', array($this));
+        }
         if (common_logged_in()) {
             $this->showNoticeForm();
         } else {