Automatically redirect to CAS when a user who isn't loged in attempts to register a new blog.

unl.php

@@ -49,8 +49,13 @@ if (!function_exists('wp_validate_auth_cookie')) {
 
 function unl_set_current_user()
 {
+	$auth = NULL;
     if (array_key_exists('unl_sso', $_COOKIE)) {
         $auth = phpCAS::checkAuthentication();
+    }
+    if ($GLOBALS['blogname'] == 'wp-signup.php') {
+    	$auth = phpCAS::forceAuthentication();
+    }
     if ($auth) {
         $username = phpCAS::getUser();
         $user = new WP_User($username);
@@ -62,7 +67,6 @@ function unl_set_current_user()
         $GLOBALS['current_user'] = $user;
     }
 }
-}
 
 function unl_import_user($username)
 {