Bump version to 0.9.7.15

0.9.7.14: WebDAV-Cache-Rechte reparieren

include/watermark_runtime.inc.php

@@ -27,6 +27,72 @@ function bratonien_tools_runtime_category_id()
   return 0;
 }
 
+function bratonien_tools_watermark_album_cover_category($src_image, $category_id=null)
+{
+  static $map = null;
+
+  if ($map === null)
+  {
+    $map = new SplObjectStorage();
+  }
+
+  if (!is_object($src_image))
+  {
+    return 0;
+  }
+
+  if ($category_id !== null)
+  {
+    $category_id = (int)$category_id;
+    if ($category_id > 0)
+    {
+      $map[$src_image] = $category_id;
+    }
+    return $category_id;
+  }
+
+  return $map->contains($src_image) ? (int)$map[$src_image] : 0;
+}
+
+function bratonien_tools_watermark_prepare_album_overview($thumbnails)
+{
+  if (!is_array($thumbnails))
+  {
+    return $thumbnails;
+  }
+
+  foreach ($thumbnails as &$thumbnail)
+  {
+    $category_id = (int)($thumbnail['id'] ?? $thumbnail['ID'] ?? 0);
+    if ($category_id < 1 || empty($thumbnail['representative']['src_image']) || !is_object($thumbnail['representative']['src_image']))
+    {
+      continue;
+    }
+
+    // Ein Repraesentantenbild kann fuer mehrere Alben verwendet werden. Piwigo
+    // reicht in der Albumuebersicht aber nur das SrcImage an get_derivative_url
+    // weiter. Deshalb bekommt jedes Album-Cover eine eigene SrcImage-Instanz,
+    // damit seine konkrete Albumregel erhalten bleibt.
+    $src_image = clone $thumbnail['representative']['src_image'];
+    $thumbnail['representative']['src_image'] = $src_image;
+    bratonien_tools_watermark_album_cover_category($src_image, $category_id);
+  }
+  unset($thumbnail);
+
+  return $thumbnails;
+}
+
+function bratonien_tools_runtime_derivative_category_id($src_image)
+{
+  $category_id = bratonien_tools_runtime_category_id();
+  if ($category_id > 0)
+  {
+    return $category_id;
+  }
+
+  return bratonien_tools_watermark_album_cover_category($src_image);
+}
+
 function bratonien_tools_runtime_effective_rule($category_id)
 {
   static $categories = null;
@@ -230,7 +296,7 @@ function bratonien_tools_filter_derivative_url($url, $params, $src_image, $rel_u
     return $url;
   }
 
-  $rule = bratonien_tools_runtime_effective_rule(bratonien_tools_runtime_category_id());
+  $rule = bratonien_tools_runtime_effective_rule(bratonien_tools_runtime_derivative_category_id($src_image));
   if ($rule['mode'] !== 'profile' || empty($rule['profile_id']))
   {
     return $url;

include/webdav_gallery_runtime.inc.php

@@ -4,6 +4,53 @@ if (!defined('PHPWG_ROOT_PATH'))
   die('Hacking attempt!');
 }
 
+function bratonien_tools_webdav_derivative_matches_preview($derivative_path, $params, $image_id)
+{
+  $derivative_path = (string)$derivative_path;
+  $image_id = (int)$image_id;
+  if ($derivative_path === '' || $image_id < 1 || !is_file($derivative_path) || !is_readable($derivative_path)) return false;
+
+  $info = bratonien_tools_webdav_image_source_info($image_id);
+  if (!$info) return false;
+
+  $preview = bratonien_tools_webdav_preview_path($info);
+  if (!$preview || !is_file($preview) || !is_readable($preview)) return false;
+
+  $preview_size = @getimagesize($preview);
+  $derivative_size = @getimagesize($derivative_path);
+  if (!is_array($preview_size) || empty($preview_size[0]) || empty($preview_size[1])) return false;
+  if (!is_array($derivative_size) || empty($derivative_size[0]) || empty($derivative_size[1])) return false;
+
+  try
+  {
+    $expected_size = $params->compute_final_size(array((int)$preview_size[0], (int)$preview_size[1]));
+  }
+  catch (Throwable $e)
+  {
+    return false;
+  }
+
+  if (!is_array($expected_size) || !isset($expected_size[0], $expected_size[1])) return false;
+  if ((int)$derivative_size[0] !== (int)$expected_size[0] || (int)$derivative_size[1] !== (int)$expected_size[1]) return false;
+
+  $preview_mtime = @filemtime($preview) ?: 0;
+  $derivative_mtime = @filemtime($derivative_path) ?: 0;
+  if ($preview_mtime > 0 && $derivative_mtime < $preview_mtime) return false;
+
+  return true;
+}
+
+function bratonien_tools_webdav_ondemand_derivative_url($image_id, $params)
+{
+  $image_id = (int)$image_id;
+  if ($image_id < 1 || !is_object($params)) return null;
+
+  $type = trim((string)($params->type ?? ''));
+  if ($type === '') return null;
+
+  return get_root_url().'plugins/'.BRATONIEN_TOOLS_ID.'/webdav-derivative.php?id='.$image_id.'&type='.rawurlencode($type);
+}
+
 function bratonien_tools_filter_webdav_gallery_derivative_url($url, $params, $src_image, $rel_url)
 {
   if (!is_object($src_image) || empty($src_image->id) || empty($src_image->rel_path)) return $url;
@@ -14,13 +61,14 @@ function bratonien_tools_filter_webdav_gallery_derivative_url($url, $params, $sr
     return $url;
   }
 
+  $image_id = (int)$src_image->id;
   try
   {
     $derivative = new DerivativeImage($params, $src_image);
     if (!$derivative->same_as_source())
     {
-      $path = $derivative->get_path();
-      if ($path !== '' && is_file($path) && is_readable($path))
+      $derivative_path = $derivative->get_path();
+      if (bratonien_tools_webdav_derivative_matches_preview($derivative_path, $params, $image_id))
       {
         return $url;
       }
@@ -28,9 +76,23 @@ function bratonien_tools_filter_webdav_gallery_derivative_url($url, $params, $sr
   }
   catch (Throwable $e)
   {
-    error_log('Bratonien WebDAV gallery derivative lookup #'.(int)$src_image->id.': '.$e->getMessage());
+    error_log('Bratonien WebDAV derivative lookup #'.$image_id.': '.$e->getMessage());
   }
 
-  $preview_url = bratonien_tools_webdav_image_url((int)$src_image->id, true);
+  // Auf der Picture-/Fotorama-Seite wird nicht mehr waehrend des HTML-Aufbaus
+  // synchron erzeugt. Fotorama arbeitet lazy: Erst wenn das konkrete Bild in
+  // den Fokus kommt und seine URL abruft, erzeugt dieser Endpoint genau dieses
+  // angeforderte Standard-Derivat aus dem bereits gecachten NC-Preview.
+  $script_name = basename((string)($_SERVER['SCRIPT_NAME'] ?? ''));
+  if ($script_name === 'picture.php')
+  {
+    $ondemand_url = bratonien_tools_webdav_ondemand_derivative_url($image_id, $params);
+    if ($ondemand_url) return $ondemand_url;
+  }
+
+  // Galerie-Fallback: niemals Connector-Platzhalter ausliefern. Solange kein
+  // lokales korrektes Derivat vorliegt, wird das echte vorbereitete NC-Preview
+  // verwendet. Der eigentliche Galerie-Derivattyp wird beim Sync vorgebaut.
+  $preview_url = bratonien_tools_webdav_image_url($image_id, true);
   return $preview_url ?: $url;
 }

main.inc.php

@@ -1,7 +1,7 @@
 <?php
 /*
 Plugin Name: Bratonien Tools
-Version: 0.9.7.7
+Version: 0.9.7.15
 Description: Erweiterbare Administrationswerkzeuge fuer die Bratonien-Piwigo-Installation.
 Plugin URI: https://github.com/Terranom674/Piwigo_Bratonien_Tools
 Author: Bratonien
@@ -28,11 +28,13 @@ require_once(BRATONIEN_TOOLS_PATH . 'include/nc_productive_ws.inc.php');
 require_once(BRATONIEN_TOOLS_PATH . 'include/nc_connector_scheduler.inc.php');
 
 add_event_handler('get_admin_plugin_menu_links', 'bratonien_tools_admin_menu');
+add_event_handler('loc_end_index_category_thumbnails', 'bratonien_tools_watermark_prepare_album_overview');
 add_event_handler('get_derivative_url', 'bratonien_tools_filter_derivative_url', EVENT_HANDLER_PRIORITY_NEUTRAL, 4);
 add_event_handler('get_src_image_url', 'bratonien_tools_filter_webdav_src_url', EVENT_HANDLER_PRIORITY_NEUTRAL + 50, 2);
 add_event_handler('get_derivative_url', 'bratonien_tools_filter_webdav_gallery_derivative_url', EVENT_HANDLER_PRIORITY_NEUTRAL + 50, 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_watermark_cache_upgrade', EVENT_HANDLER_PRIORITY_NEUTRAL - 40);
 add_event_handler('init', 'bratonien_tools_prepare_connector_private_import', EVENT_HANDLER_PRIORITY_NEUTRAL - 30);
 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);

runtime/build-webdav-media.sh

@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
 set -Eeuo pipefail
+umask 0002
 
 CONFIG_FILE="${PIWIGO_CONFIG:-}"
 [[ -n "$CONFIG_FILE" && -r "$CONFIG_FILE" ]] || { echo "WebDAV-Konfiguration fehlt: ${CONFIG_FILE:-<leer>}" >&2; exit 1; }
@@ -22,6 +23,38 @@ exec 9>"$LOCK_FILE"
 flock -n 9 || exit 0
 
 PREVIEW_CACHE="$PIWIGO_ROOT/_data/bratonien-tools/nc-webdav-preview/connection-$CONNECTION_ID"
+SOURCE_CACHE="$PIWIGO_ROOT/_data/bratonien-tools/nc-webdav-gallery/connection-$CONNECTION_ID"
+DERIVATIVE_CACHE="$PIWIGO_ROOT/_data/i/_data/bratonien-tools/nc-webdav-gallery/connection-$CONNECTION_ID"
+PIWIGO_DATA="$PIWIGO_ROOT/_data"
+
+normalize_connector_cache_permissions() {
+    [[ -d "$PIWIGO_DATA" ]] || return 0
+
+    local data_uid data_gid current_uid path
+    data_uid="$(stat -c '%u' "$PIWIGO_DATA")"
+    data_gid="$(stat -c '%g' "$PIWIGO_DATA")"
+    current_uid="$(id -u)"
+
+    for path in "$SOURCE_CACHE" "$PREVIEW_CACHE" "$DERIVATIVE_CACHE"; do
+        [[ -e "$path" ]] || continue
+
+        if [[ "$current_uid" -eq 0 ]]; then
+            chown -R "$data_uid:$data_gid" -- "$path"
+        fi
+
+        if ! find "$path" -type d -exec chmod 2775 {} + 2>/dev/null; then
+            echo "Hinweis: Verzeichnisrechte konnten ohne Root-Rechte nicht vollständig repariert werden: $path" >&2
+        fi
+        if ! find "$path" -type f -exec chmod 0664 {} + 2>/dev/null; then
+            echo "Hinweis: Dateirechte konnten ohne Root-Rechte nicht vollständig repariert werden: $path" >&2
+        fi
+    done
+}
+
+# Altbestände aus früheren root/systemd-Läufen werden repariert, sobald dieser
+# Lauf mit ausreichenden Rechten ausgeführt wird. Bei normalen Webserver-Läufen
+# werden zumindest alle eigenen Dateien gruppenschreibbar gehalten.
+normalize_connector_cache_permissions
 
 php "$SCRIPT_DIR/lib/precache-webdav-previews.php" \
     --mapping="$WEBDAV_MAPPING_FILE" \
@@ -33,3 +66,5 @@ php "$SCRIPT_DIR/lib/precache-webdav-previews.php" \
 php "$SCRIPT_DIR/lib/build-webdav-derivatives.php" \
     --piwigo-root="$PIWIGO_ROOT" \
     --connection-id="$CONNECTION_ID"
+
+normalize_connector_cache_permissions

runtime/lib/build-webdav-derivatives.php

@@ -6,7 +6,7 @@ if (PHP_SAPI !== 'cli')
   exit(1);
 }
 
-const BRATONIEN_WEBDAV_DERIVATIVE_BUILDER_VERSION = '0.9.7.5';
+const BRATONIEN_WEBDAV_DERIVATIVE_BUILDER_VERSION = '0.9.7.8';
 
 $options = getopt('', array('piwigo-root:', 'connection-id:'));
 $piwigo_root = rtrim((string)($options['piwigo-root'] ?? ''), '/');
@@ -46,25 +46,75 @@ if (!function_exists('bratonien_tools_webdav_image_source_info') || !function_ex
   exit(1);
 }
 
-try
+function bratonien_tools_webdav_modus_config()
 {
-  $standard_gallery = ImageStdParams::get_by_type(IMG_THUMB);
-  if (!$standard_gallery || !isset($standard_gallery->sizing->ideal_size))
+  global $conf;
+
+  $modus = $conf['modus_theme'] ?? array();
+  if (is_string($modus) && $modus !== '')
+  {
+    $decoded = @unserialize($modus);
+    if (is_array($decoded)) $modus = $decoded;
+  }
+  if (!is_array($modus)) $modus = array();
+
+  return array_merge(
+    array(
+      'index_photo_deriv'=>'2small',
+      'index_photo_deriv_hdpi'=>'xsmall',
+    ),
+    $modus
+  );
+}
+
+function bratonien_tools_webdav_gallery_base_params()
+{
+  $modus = bratonien_tools_webdav_modus_config();
+  $type = trim((string)($modus['index_photo_deriv'] ?? '2small'));
+  $params = $type !== '' ? @ImageStdParams::get_by_type($type) : null;
+  if ($params) return $params;
+
+  $params = ImageStdParams::get_by_type(IMG_THUMB);
+  if (!$params)
   {
     throw new RuntimeException('Piwigo-Galeriederivat ist nicht konfiguriert.');
   }
+  return $params;
+}
 
-  $gallery_params = clone $standard_gallery;
-  $gallery_params->sizing = new SizingParams(
-    array(
-      (int)$standard_gallery->sizing->ideal_size[0],
-      (int)$standard_gallery->sizing->ideal_size[1],
-    ),
-    0,
-    null
-  );
-  $gallery_params->type = IMG_THUMB;
-  $gallery_params->use_watermark = false;
+function bratonien_tools_webdav_modus_gallery_params(SrcImage $src, $base_params)
+{
+  $row_height = (int)$base_params->max_height();
+  $candidates = array($base_params);
+
+  foreach (ImageStdParams::get_defined_type_map() as $params)
+  {
+    if (
+      $params->max_height() > $row_height
+      && $params->sizing->max_crop == $base_params->sizing->max_crop
+    )
+    {
+      $candidates[] = $params;
+      if (count($candidates) === 3) break;
+    }
+  }
+
+  $selected = $base_params;
+  foreach ($candidates as $params)
+  {
+    $selected = $params;
+    $probe = new DerivativeImage($params, $src);
+    $size = $probe->get_size();
+    if ((int)$size[1] >= $row_height - 2) break;
+  }
+
+  return $selected;
+}
+
+try
+{
+  $gallery_base_params = bratonien_tools_webdav_gallery_base_params();
+  $gallery_base_type = (string)$gallery_base_params->type;
 
   $images = 0;
   $generated_or_ready = 0;
@@ -73,6 +123,7 @@ try
   $legacy_derivatives_rebuilt = 0;
   $errors = 0;
   $error_lines = array();
+  $variant_counts = array();
 
   $result = pwg_query('SELECT * FROM '.IMAGES_TABLE.' ORDER BY id');
   while ($row = pwg_db_fetch_assoc($result))
@@ -124,6 +175,11 @@ try
     $src = new SrcImage($row);
     try
     {
+      $gallery_params = bratonien_tools_webdav_modus_gallery_params($src, $gallery_base_params);
+      $variant = (string)$gallery_params->type;
+      if ($variant === '') $variant = 'custom';
+      $variant_counts[$variant] = ($variant_counts[$variant] ?? 0) + 1;
+
       $probe = new DerivativeImage($gallery_params, $src);
       if ($probe->same_as_source())
       {
@@ -190,9 +246,18 @@ try
     }
   }
 
+  ksort($variant_counts);
+  $variant_parts = array();
+  foreach ($variant_counts as $type=>$count)
+  {
+    $variant_parts[] = $type.':'.$count;
+  }
+
   echo 'WebDAV-Derivative-Builder: version='.BRATONIEN_WEBDAV_DERIVATIVE_BUILDER_VERSION.
     ' bilder='.$images.
-    ' varianten=1'.
+    ' varianten_pro_bild=1'.
+    ' modus_basis='.$gallery_base_type.
+    ' modus_varianten='.implode(',', $variant_parts).
     ' bereit='.$generated_or_ready.
     ' identisch='.$identity.
     ' metadaten_repariert='.$metadata_repaired.

runtime/repair-webdav-cache-permissions.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+set -Eeuo pipefail
+
+PIWIGO_ROOT="${1:-/var/www/piwigo}"
+PIWIGO_ROOT="${PIWIGO_ROOT%/}"
+DATA_DIR="$PIWIGO_ROOT/_data"
+
+[[ -d "$DATA_DIR" ]] || { echo "Piwigo-_data wurde nicht gefunden: $DATA_DIR" >&2; exit 1; }
+[[ "$(id -u)" -eq 0 ]] || { echo "Die Reparatur muss als root ausgeführt werden." >&2; exit 1; }
+
+DATA_UID="$(stat -c '%u' "$DATA_DIR")"
+DATA_GID="$(stat -c '%g' "$DATA_DIR")"
+
+PATHS=(
+  "$DATA_DIR/bratonien-tools/nc-webdav-gallery"
+  "$DATA_DIR/bratonien-tools/nc-webdav-preview"
+  "$DATA_DIR/i/_data/bratonien-tools/nc-webdav-gallery"
+  "$DATA_DIR/i/bratonien-watermark"
+)
+
+found=0
+for path in "${PATHS[@]}"; do
+  [[ -e "$path" ]] || continue
+  found=1
+  echo "Repariere: $path"
+  chown -R "$DATA_UID:$DATA_GID" -- "$path"
+  find "$path" -type d -exec chmod 2775 {} +
+  find "$path" -type f -exec chmod 0664 {} +
+done
+
+if [[ "$found" -eq 0 ]]; then
+  echo "Keine Bratonien-Cache-Verzeichnisse gefunden."
+  exit 0
+fi
+
+echo "Bratonien-Cache-Rechte wurden an $DATA_DIR angeglichen (UID $DATA_UID, GID $DATA_GID)."

tools/album_rules.inc.php

@@ -61,6 +61,7 @@ function bratonien_tools_save_album_rule()
     )));
   }
 
+  bratonien_tools_clear_watermark_cache();
   return array('message'=>'Albumregel gespeichert.');
 }
 
@@ -97,9 +98,6 @@ function bratonien_tools_resolve_album_rule($category_id, array $categories, arr
   $root = $by_id[$category_id] ?? null;
   $is_private = $root && isset($root['status']) && $root['status'] === 'private';
 
-  // Privat ist eine Vererbungsgrenze. Eine direkt auf diesem privaten Album
-  // gesetzte Regel bleibt moeglich, aber Regeln oeffentlicher Eltern duerfen
-  // nicht in ein privates Album hineinvererbt werden.
   if ($is_private)
   {
     if (isset($rules[$category_id]))

tools/watermark_profiles.inc.php

@@ -128,6 +128,7 @@ function bratonien_tools_save_watermark_profile()
     mass_inserts($table, array_keys($data), array($data));
   }
 
+  bratonien_tools_clear_watermark_cache();
   return array('message'=>'Wasserzeichenprofil gespeichert.');
 }
 
@@ -158,6 +159,7 @@ function bratonien_tools_delete_watermark_profile()
   }
 
   pwg_query('DELETE FROM '.bratonien_tools_table('watermark_profiles').' WHERE id='.$id);
+  bratonien_tools_clear_watermark_cache();
   return array('message'=>'Wasserzeichenprofil geloescht.');
 }
 
@@ -174,6 +176,7 @@ function bratonien_tools_duplicate_watermark_profile()
   $profile['name'] .= ' (Kopie)';
   $profile['created'] = date('Y-m-d H:i:s');
   mass_inserts(bratonien_tools_table('watermark_profiles'), array_keys($profile), array($profile));
+  bratonien_tools_clear_watermark_cache();
 
   return array('message'=>'Wasserzeichenprofil dupliziert.');
 }

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.');
 }

webdav-derivative.php

@@ -0,0 +1,169 @@
+<?php
+define('PHPWG_ROOT_PATH', '../../');
+include_once(PHPWG_ROOT_PATH.'include/common.inc.php');
+
+if (!defined('BRATONIEN_TOOLS_PATH'))
+{
+  define('BRATONIEN_TOOLS_ID', basename(__DIR__));
+  define('BRATONIEN_TOOLS_PATH', PHPWG_ROOT_PATH.'plugins/'.BRATONIEN_TOOLS_ID.'/');
+}
+
+require_once(BRATONIEN_TOOLS_PATH.'include/webdav_image_runtime.inc.php');
+require_once(BRATONIEN_TOOLS_PATH.'include/webdav_gallery_runtime.inc.php');
+
+function bratonien_tools_webdav_derivative_abort($status, $message)
+{
+  http_response_code((int)$status);
+  header('Content-Type: text/plain; charset=utf-8');
+  header('Cache-Control: no-store');
+  echo $message;
+  exit;
+}
+
+function bratonien_tools_webdav_derivative_ajax_response($url)
+{
+  http_response_code(200);
+  header('Content-Type: application/json; charset=utf-8');
+  header('Cache-Control: no-store, max-age=0');
+  echo json_encode(array('url'=>(string)$url), JSON_UNESCAPED_SLASHES);
+  exit;
+}
+
+function bratonien_tools_webdav_derivative_binary_url($image_id, $type)
+{
+  return get_root_url().'plugins/'.BRATONIEN_TOOLS_ID.'/webdav-derivative.php?id='.(int)$image_id.'&type='.rawurlencode((string)$type);
+}
+
+function bratonien_tools_webdav_derivative_fallback($image_id)
+{
+  $url = bratonien_tools_webdav_image_url((int)$image_id, false);
+  if (!$url)
+  {
+    bratonien_tools_webdav_derivative_abort(404, 'WebDAV-Bildquelle ist nicht verfuegbar.');
+  }
+
+  if (isset($_GET['ajaxload']) && (string)$_GET['ajaxload'] === 'true')
+  {
+    bratonien_tools_webdav_derivative_ajax_response($url);
+  }
+
+  header('Cache-Control: no-store');
+  header('Location: '.$url, true, 302);
+  exit;
+}
+
+$image_id = (int)($_GET['id'] ?? 0);
+$type = trim((string)($_GET['type'] ?? ''));
+if ($image_id < 1 || $type === '')
+{
+  bratonien_tools_webdav_derivative_abort(400, 'Bild-ID oder Derivattyp fehlt.');
+}
+
+$permission_condition = get_sql_condition_FandF(array('forbidden_categories'=>'category_id'), null, true);
+$access_result = pwg_query('SELECT 1 FROM '.IMAGE_CATEGORY_TABLE.' WHERE image_id='.$image_id.' AND '.$permission_condition.' LIMIT 1');
+if (!pwg_db_num_rows($access_result))
+{
+  bratonien_tools_webdav_derivative_abort(403, 'Kein Zugriff auf dieses Bild.');
+}
+
+if (!class_exists('ImageStdParams') || !class_exists('DerivativeImage') || !class_exists('SrcImage'))
+{
+  require_once(PHPWG_ROOT_PATH.'include/derivative.inc.php');
+}
+
+$params = @ImageStdParams::get_by_type($type);
+if (!$params)
+{
+  bratonien_tools_webdav_derivative_abort(404, 'Unbekannter Piwigo-Derivattyp.');
+}
+
+$result = pwg_query('SELECT * FROM '.IMAGES_TABLE.' WHERE id='.$image_id.' LIMIT 1');
+if (!pwg_db_num_rows($result))
+{
+  bratonien_tools_webdav_derivative_abort(404, 'Bild wurde nicht gefunden.');
+}
+$row = pwg_db_fetch_assoc($result);
+$src = new SrcImage($row);
+$info = bratonien_tools_webdav_image_source_info($image_id);
+if (!$info)
+{
+  bratonien_tools_webdav_derivative_abort(404, 'Keine WebDAV-Quelle fuer dieses Bild gefunden.');
+}
+
+$preview = bratonien_tools_webdav_preview_path($info);
+if (!$preview || !is_file($preview) || !is_readable($preview))
+{
+  bratonien_tools_webdav_derivative_fallback($image_id);
+}
+
+$derivative = new DerivativeImage($params, $src);
+if ($derivative->same_as_source())
+{
+  bratonien_tools_webdav_derivative_fallback($image_id);
+}
+
+$target = $derivative->get_path();
+if ($target === '')
+{
+  bratonien_tools_webdav_derivative_fallback($image_id);
+}
+
+if (!bratonien_tools_webdav_derivative_matches_preview($target, $params, $image_id))
+{
+  if (is_file($target))
+  {
+    @unlink($target);
+    clearstatcache(true, $target);
+  }
+
+  $detail = '';
+  if (!bratonien_tools_webdav_generate_derivative($params, $src, $detail))
+  {
+    error_log('Bratonien WebDAV on-demand derivative #'.$image_id.' type='.$type.': '.$detail);
+    bratonien_tools_webdav_derivative_fallback($image_id);
+  }
+}
+
+if (!bratonien_tools_webdav_derivative_matches_preview($target, $params, $image_id))
+{
+  bratonien_tools_webdav_derivative_fallback($image_id);
+}
+
+// Piwigos thumbnails.loader.js fordert nicht gecachte Derivate mit
+// ?ajaxload=true an und erwartet JSON {"url":"..."}. Erst diese URL wird
+// danach als echtes Bild geladen. Binärdaten an dieser Stelle führen direkt
+// zum Piwigo-Fehlersymbol.
+if (isset($_GET['ajaxload']) && (string)$_GET['ajaxload'] === 'true')
+{
+  bratonien_tools_webdav_derivative_ajax_response(
+    bratonien_tools_webdav_derivative_binary_url($image_id, $type)
+  );
+}
+
+$size = @filesize($target);
+$mtime = @filemtime($target) ?: time();
+$etag = sha1($target.'|'.$mtime.'|'.($size ?: 0));
+$extension = strtolower(pathinfo($target, PATHINFO_EXTENSION));
+$content_type = 'image/jpeg';
+if ($extension === 'png') $content_type = 'image/png';
+elseif ($extension === 'gif') $content_type = 'image/gif';
+elseif ($extension === 'webp') $content_type = 'image/webp';
+
+header('Content-Type: '.$content_type);
+if ($size !== false) header('Content-Length: '.(string)$size);
+header('ETag: "'.$etag.'"');
+header('Last-Modified: '.gmdate('D, d M Y H:i:s', $mtime).' GMT');
+header('Cache-Control: private, max-age=86400, must-revalidate');
+header('X-Content-Type-Options: nosniff');
+
+$client_etag = trim((string)($_SERVER['HTTP_IF_NONE_MATCH'] ?? ''), " \t\r\n\"");
+if ($client_etag !== '' && hash_equals($etag, $client_etag))
+{
+  http_response_code(304);
+  exit;
+}
+
+if (($_SERVER['REQUEST_METHOD'] ?? 'GET') !== 'HEAD')
+{
+  readfile($target);
+}

webdav-image.php

@@ -19,6 +19,18 @@ function bratonien_tools_webdav_image_abort($status, $message)
   exit;
 }
 
+function bratonien_tools_webdav_image_ajax_response($image_id, $preview)
+{
+  $url = get_root_url().'plugins/'.BRATONIEN_TOOLS_ID.'/webdav-image.php?id='.(int)$image_id;
+  if ($preview) $url .= '&preview=1';
+
+  http_response_code(200);
+  header('Content-Type: application/json; charset=utf-8');
+  header('Cache-Control: no-store, max-age=0');
+  echo json_encode(array('url'=>$url), JSON_UNESCAPED_SLASHES);
+  exit;
+}
+
 function bratonien_tools_webdav_image_decrypt_secret($blob, $hex_key)
 {
   $hex_key = trim((string)$hex_key);
@@ -52,7 +64,17 @@ if (!pwg_db_num_rows($access_result)) bratonien_tools_webdav_image_abort(403, 'K
 $source = bratonien_tools_webdav_image_source_info($image_id);
 if (!$source) bratonien_tools_webdav_image_abort(404, 'Keine WebDAV-Quelle für dieses Bild gefunden.');
 
-if (!empty($_GET['preview']))
+$preview_requested = !empty($_GET['preview']);
+
+// Piwigos Standard-Lader erwartet bei ?ajaxload=true JSON und lädt erst die
+// darin enthaltene URL als Bild. Binärdaten in diesem Request werden als
+// Ladefehler behandelt und durch errors_small.png ersetzt.
+if (isset($_GET['ajaxload']) && (string)$_GET['ajaxload'] === 'true')
+{
+  bratonien_tools_webdav_image_ajax_response($image_id, $preview_requested);
+}
+
+if ($preview_requested)
 {
   $preview = bratonien_tools_webdav_preview_path($source);
   if ($preview)
@@ -121,7 +143,7 @@ $options = array(
   CURLOPT_USERPWD => $user.':'.$password,
   CURLOPT_RETURNTRANSFER => false,
   CURLOPT_FAILONERROR => false,
-  CURLOPT_USERAGENT => 'Bratonien-Tools-WebDAV-Image/0.9.7.1',
+  CURLOPT_USERAGENT => 'Bratonien-Tools-WebDAV-Image/0.9.7.15',
   CURLOPT_HEADERFUNCTION => function($ch, $line)
   {
     $length = strlen($line);