Fix private album owner access on permissions form

main.inc.php

@@ -1,7 +1,7 @@
 <?php
 /*
 Plugin Name: Bratonien Tools
-Version: 0.13.1
+Version: 0.13.2
 Description: Erweiterbare Administrationswerkzeuge fuer die Bratonien-Piwigo-Installation.
 Plugin URI: https://github.com/Terranom674/Piwigo_Bratonien_Tools
 Author: Bratonien
@@ -25,10 +25,67 @@ add_event_handler('get_admin_plugin_menu_links', 'bratonien_tools_admin_menu');
 add_event_handler('get_derivative_url', 'bratonien_tools_filter_derivative_url', EVENT_HANDLER_PRIORITY_NEUTRAL, 4);
 add_event_handler('loc_end_element_set_global', 'bratonien_tools_batch_titles_register_action');
 add_event_handler('element_set_global_action', 'bratonien_tools_batch_titles_apply', EVENT_HANDLER_PRIORITY_NEUTRAL, 2);
+add_event_handler('init', 'bratonien_tools_prepare_private_album_permissions', EVENT_HANDLER_PRIORITY_NEUTRAL - 20);
 add_event_handler('init', 'bratonien_tools_preserve_private_album_access', EVENT_HANDLER_PRIORITY_NEUTRAL - 10);
 add_event_handler('init', 'bratonien_tools_album_shares_init');
 add_event_handler('delete_categories', 'bratonien_tools_album_shares_on_delete_categories');
 
+/**
+ * Piwigo's per-album permissions form rewrites the complete direct-user
+ * permission list when an album is saved as private. Add the acting user to
+ * that submitted list on the public -> private transition so Piwigo itself
+ * persists the permission together with the other selected users.
+ */
+function bratonien_tools_prepare_private_album_permissions()
+{
+  global $user;
+
+  if (
+    !defined('IN_ADMIN')
+    || $_SERVER['REQUEST_METHOD'] !== 'POST'
+    || empty($user['id'])
+    || (string)($_POST['status'] ?? '') !== 'private'
+  )
+  {
+    return;
+  }
+
+  $page = (string)($_GET['page'] ?? '');
+  if (!preg_match('/^album-(\d+)-permissions$/', $page, $matches))
+  {
+    return;
+  }
+
+  $category_id = (int)$matches[1];
+  if ($category_id < 1)
+  {
+    return;
+  }
+
+  $result = pwg_query('SELECT status FROM '.CATEGORIES_TABLE.' WHERE id = '.$category_id.' LIMIT 1');
+  if (!pwg_db_num_rows($result))
+  {
+    return;
+  }
+
+  $category = pwg_db_fetch_assoc($result);
+  if ($category['status'] !== 'public')
+  {
+    return;
+  }
+
+  $users = isset($_POST['users']) && is_array($_POST['users']) ? $_POST['users'] : array();
+  $current_user_id = (int)$user['id'];
+  $normalized_user_ids = array_map('intval', $users);
+
+  if (!in_array($current_user_id, $normalized_user_ids, true))
+  {
+    $users[] = $current_user_id;
+  }
+
+  $_POST['users'] = $users;
+}
+
 function bratonien_tools_admin_menu($menu)
 {
   $menu[] = array(