From ac6353b050cdf30db79ab20716e66e6a6c841abb Mon Sep 17 00:00:00 2001
From: Terranom674 <thomas_dannenberg@web.de>
Date: Thu, 3 Sep 2026 17:43:46 +0200
Subject: [PATCH] Add independent WebDAV source index

---
 include/webdav_source_index.inc.php | 136 ++++++++++++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100644 include/webdav_source_index.inc.php

diff --git a/include/webdav_source_index.inc.php b/include/webdav_source_index.inc.php
new file mode 100644
index 0000000..cbc77b0
--- /dev/null
+++ b/include/webdav_source_index.inc.php
@@ -0,0 +1,136 @@
+<?php
+if (!defined('PHPWG_ROOT_PATH'))
+{
+  die('Hacking attempt!');
+}
+
+function bratonien_tools_webdav_source_index_file($connection_id)
+{
+  return PHPWG_ROOT_PATH.PWG_LOCAL_DIR.'bratonien-webdav-source-index.connection-'.(int)$connection_id.'.json';
+}
+
+function bratonien_tools_webdav_source_index_empty($connection_id)
+{
+  return array(
+    'schema_version'=>1,
+    'connection_id'=>(int)$connection_id,
+    'updated_at'=>0,
+    'last_periodic_at'=>0,
+    'sources'=>array(),
+  );
+}
+
+function bratonien_tools_webdav_source_index_load($connection_id)
+{
+  $file = bratonien_tools_webdav_source_index_file($connection_id);
+  if (!is_file($file) || !is_readable($file)) return null;
+
+  $raw = @file_get_contents($file);
+  $index = $raw !== false ? json_decode($raw, true) : null;
+  if (!is_array($index)) return null;
+
+  $base = bratonien_tools_webdav_source_index_empty($connection_id);
+  $index = array_merge($base, $index);
+  if (!isset($index['sources']) || !is_array($index['sources'])) $index['sources'] = array();
+  $index['connection_id'] = (int)$connection_id;
+  return $index;
+}
+
+function bratonien_tools_webdav_source_index_save($connection_id, array $index)
+{
+  $file = bratonien_tools_webdav_source_index_file($connection_id);
+  $directory = dirname($file);
+  if (!is_dir($directory) && !@mkdir($directory, 0775, true) && !is_dir($directory))
+  {
+    throw new RuntimeException('WebDAV-Quellenindex-Verzeichnis konnte nicht angelegt werden.');
+  }
+
+  $index['schema_version'] = 1;
+  $index['connection_id'] = (int)$connection_id;
+  $index['updated_at'] = time();
+  if (!isset($index['sources']) || !is_array($index['sources'])) $index['sources'] = array();
+  ksort($index['sources'], SORT_STRING);
+
+  $json = json_encode($index, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT);
+  if ($json === false) throw new RuntimeException('WebDAV-Quellenindex konnte nicht serialisiert werden.');
+
+  $tmp = $file.'.tmp-'.bin2hex(random_bytes(4));
+  if (@file_put_contents($tmp, $json."\n", LOCK_EX) === false)
+  {
+    throw new RuntimeException('WebDAV-Quellenindex konnte nicht geschrieben werden.');
+  }
+  @chmod($tmp, 0664);
+  if (!@rename($tmp, $file))
+  {
+    @unlink($tmp);
+    throw new RuntimeException('WebDAV-Quellenindex konnte nicht atomar gespeichert werden.');
+  }
+}
+
+function bratonien_tools_webdav_source_index_key(array $source)
+{
+  $connection_id = (int)($source['connection_id'] ?? 0);
+  $fileid = (int)($source['fileid'] ?? 0);
+  if ($fileid > 0)
+  {
+    return 'c'.$connection_id.':f'.$fileid;
+  }
+
+  $root_fileid = (int)($source['root_fileid'] ?? 0);
+  $path = trim((string)($source['webdav_path'] ?? ''), '/');
+  return 'c'.$connection_id.':r'.$root_fileid.':p'.sha1($path);
+}
+
+function bratonien_tools_webdav_source_index_signature(array $source)
+{
+  return sha1(implode('|', array(
+    (int)($source['connection_id'] ?? 0),
+    (int)($source['root_fileid'] ?? 0),
+    (int)($source['fileid'] ?? 0),
+    trim((string)($source['webdav_path'] ?? ''), '/'),
+    (string)($source['etag'] ?? ''),
+    (int)($source['size'] ?? 0),
+    strtolower((string)($source['content_type'] ?? $source['mime'] ?? '')),
+    (int)($source['width'] ?? 0),
+    (int)($source['height'] ?? 0),
+  )));
+}
+
+function bratonien_tools_webdav_source_index_metadata(array $source, $image_id)
+{
+  $path = trim((string)($source['webdav_path'] ?? ''), '/');
+  return array(
+    'image_id'=>(int)$image_id,
+    'fileid'=>(int)($source['fileid'] ?? 0),
+    'root_fileid'=>(int)($source['root_fileid'] ?? 0),
+    'webdav_path'=>$path,
+    'name'=>basename($path),
+    'etag'=>(string)($source['etag'] ?? ''),
+    'size'=>(int)($source['size'] ?? 0),
+    'content_type'=>(string)($source['content_type'] ?? $source['mime'] ?? ''),
+    'width'=>(int)($source['width'] ?? 0),
+    'height'=>(int)($source['height'] ?? 0),
+    'source_signature'=>bratonien_tools_webdav_source_index_signature($source),
+    'last_seen_at'=>time(),
+  );
+}
+
+function bratonien_tools_webdav_source_index_is_current(array $entry, $signature)
+{
+  return isset($entry['source_signature']) && hash_equals((string)$entry['source_signature'], (string)$signature);
+}
+
+function bratonien_tools_webdav_source_index_prune(array &$index, array $current_keys)
+{
+  $keep = array_fill_keys($current_keys, true);
+  $removed = 0;
+  foreach (array_keys((array)$index['sources']) as $key)
+  {
+    if (!isset($keep[$key]))
+    {
+      unset($index['sources'][$key]);
+      $removed++;
+    }
+  }
+  return $removed;
+}