Bug 1724743: Allow pages to ignore maintenance mode

by defining IGNOREMAINTENANCE in the php file

Useful to allow certain public pages to still be accessible to outside
world, eg the SAML metadata

behatnotneeded

Change-Id: If5e5e7520917c3128571537c5d50ed3fdd4add04
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>

htdocs/auth/saml/sp/metadata.php

@@ -30,6 +30,7 @@
 
 define('INTERNAL', 1);
 define('PUBLIC', 1);
+define('IGNOREMAINTENANCE', 1);
 define('XMLRPC', 1);
 define('TITLE', '');
 global $CFG, $USER, $SESSION;

htdocs/init.php

@@ -412,7 +412,7 @@ if ($siteclosedforupgrade || (get_config('siteclosedbyadmin') && !$USER->admin))
     if (defined('CLI') && !defined('INSTALLER')) {
         exit("Site closed.\n");
     }
-    if (!defined('HOME') && !defined('INSTALLER')) {
+    if (!defined('HOME') && !defined('INSTALLER') && !defined('IGNOREMAINTENANCE')) {
         redirect();
     }
 }