User: Add custom login template support for session expiration page - refs BT#22335

main/inc/lib/api.lib.php

@@ -4030,6 +4030,18 @@ function api_not_allowed(
 
     global $this_section;
 
+    // Check if a custom file (login.tpl) exists for custompages included overrides
+    if ((!isset($user_id) || api_is_anonymous()) && CustomPages::enabled()) {
+        $customLoginTemplate = Template::findTemplateFilePath('custompage/login.tpl');
+        if (file_exists(api_get_path(SYS_TEMPLATE_PATH) . $customLoginTemplate)) {
+            $tpl = new Template(null, false, false);
+            $content = $tpl->fetch($customLoginTemplate);
+            $tpl->assign('content', $content);
+            $tpl->display_one_col_template();
+            exit;
+        }
+    }
+
     if (CustomPages::enabled() && !isset($user_id)) {
         if (empty($user_id)) {
             // Why the CustomPages::enabled() need to be to set the request_uri