From c71112d94e03d2370b8ebf67a2fca15e4db8f109 Mon Sep 17 00:00:00 2001
From: Terranom674 <thomas_dannenberg@web.de>
Date: Wed, 19 Aug 2026 22:41:20 +0200
Subject: [PATCH] Invalidate watermark cache on rule changes

---
 tools/watermark_settings.inc.php | 54 ++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/tools/watermark_settings.inc.php b/tools/watermark_settings.inc.php
index cfa2948..4e29868 100644
--- a/tools/watermark_settings.inc.php
+++ b/tools/watermark_settings.inc.php
@@ -4,6 +4,59 @@ if (!defined('PHPWG_ROOT_PATH'))
   die('Hacking attempt!');
 }
 
+function bratonien_tools_watermark_cache_dir()
+{
+  return PHPWG_ROOT_PATH.PWG_DERIVATIVE_DIR.'bratonien-watermark';
+}
+
+function bratonien_tools_remove_tree($path)
+{
+  $path = rtrim((string)$path, DIRECTORY_SEPARATOR);
+  if ($path === '' || !file_exists($path)) return;
+
+  if (is_file($path) || is_link($path))
+  {
+    @unlink($path);
+    return;
+  }
+
+  foreach (scandir($path) ?: array() as $entry)
+  {
+    if ($entry === '.' || $entry === '..') continue;
+    bratonien_tools_remove_tree($path.DIRECTORY_SEPARATOR.$entry);
+  }
+  @rmdir($path);
+}
+
+function bratonien_tools_clear_watermark_cache()
+{
+  $dir = bratonien_tools_watermark_cache_dir();
+  $derivative_root = realpath(PHPWG_ROOT_PATH.PWG_DERIVATIVE_DIR);
+  $parent = realpath(dirname($dir));
+
+  if ($derivative_root === false || $parent === false || $parent !== $derivative_root)
+  {
+    throw new RuntimeException('Wasserzeichen-Cachepfad ist ungueltig.');
+  }
+
+  if (is_dir($dir))
+  {
+    bratonien_tools_remove_tree($dir);
+  }
+}
+
+function bratonien_tools_watermark_cache_upgrade()
+{
+  $version = '0.9.7.13';
+  if ((string)conf_get_param('bratonien_watermark_cache_version', '') === $version)
+  {
+    return;
+  }
+
+  bratonien_tools_clear_watermark_cache();
+  conf_update_param('bratonien_watermark_cache_version', $version);
+}
+
 function bratonien_tools_get_watermark_defaults()
 {
   $defaults = conf_get_param('bratonien_watermark_defaults', null);
@@ -40,6 +93,7 @@ function bratonien_tools_save_watermark_defaults()
   );
 
   conf_update_param('bratonien_watermark_defaults', json_encode($config));
+  bratonien_tools_clear_watermark_cache();
 
   return array('message'=>'Globale Wasserzeichenregeln gespeichert.');
 }