diff --git a/CHANGELOG.md b/CHANGELOG.md
index 334b498..5c5bf17 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+saba 2023.10.20
+===========================================================
+* Require Dotclear 2.28
+* Require PHP 8.1
+* Upgrade to Dotclear 2.28
+
 saba 2023.08.13
 ===========================================================
 * Require Dotclear 2.27
diff --git a/README.md b/README.md
index 1861cef..9e45fab 100644
--- a/README.md
+++ b/README.md
@@ -1,27 +1,24 @@
 # README
 
-[![Release](https://img.shields.io/badge/release-2023.08.13-a2cbe9.svg)](https://git.dotclear.watch/JcDenis/saba/releases)
-[![Date](https://img.shields.io/badge/date-2023.08.13-c44d58.svg)](https://git.dotclear.watch/JcDenis/saba/releases)
-[![Dotclear](https://img.shields.io/badge/dotclear-v2.27-137bbb.svg)](https://fr.dotclear.org/download)
+[![Release](https://img.shields.io/badge/release-2023.10.20-a2cbe9.svg)](https://git.dotclear.watch/JcDenis/saba/releases)
+![Date](https://img.shields.io/badge/date-2023.10.20-c44d58.svg)
+[![Dotclear](https://img.shields.io/badge/dotclear-v2.28-137bbb.svg)](https://fr.dotclear.org/download)
 [![Dotaddict](https://img.shields.io/badge/dotaddict-official-9ac123.svg)](https://plugins.dotaddict.org/dc2/details/saba)
-[![License](https://img.shields.io/github/license/JcDenis/saba)](https://git.dotclear.watch/JcDenis/saba/blob/master/LICENSE)
+[![License](https://img.shields.io/badge/license-GPL--2.0-ececec.svg)](https://git.dotclear.watch/JcDenis/saba/src/branch/master/LICENSE)
 
-## WHAT IS SABA ?
+## ABOUT
 
-_saba_ : Search Across Blog's Archive is a plugins for the open-source 
-web publishing software called Dotclear.
+_saba_ is a plugin for the open-source web publishing software called [Dotclear](https://www.dotclear.org).
 
-It replaces public search page and 404 page by a custom page that 
+> Replace public search page and 404 page by a custom page that 
 show related entries to visitor.
 
 ## REQUIREMENTS
 
-_saba_ requires: 
-
-* administrator permissions
-* Dotclear 2.27
-* PHP 7.4
+* Dotclear 2.28
+* PHP 8.1
 * Custom templates if default theme is not used.
+* Dotclear administrator permissions
 
 ## USAGE
 
@@ -37,12 +34,13 @@ You can find exemple in plugins/saba/default-tempaltes.
 
 ## MORE
 
-* License : [GNU GPL v2](https://www.gnu.org/licenses/old-licenses/lgpl-2.0.html)
-* Source & contribution : [Gitea Page](https://git.dotclear.watch/JcDenis/saba) or [GitHub Page](https://github.com/JcDenis/saba)
-* Packages & details: [Gitea Page](https://git.dotclear.watch/JcDenis/saba/releases) or [Dotaddict Page](https://plugins.dotaddict.org/dc2/details/saba)
+* [License](https://git.dotclear.watch/JcDenis/saba/src/branch/master/LICENSE)
+* [Packages & details](https://git.dotclear.watch/JcDenis/saba/releases) (or on [Dotaddict](https://plugins.dotaddict.org/dc2/details/saba))
+* [Sources & contributions](https://git.dotclear.watch/JcDenis/saba) (or on [GitHub](https://github.com/JcDenis/saba))
+* [Issues & security](https://git.dotclear.watch/JcDenis/saba/issues) (or on [GitHub](https://github.com/JcDenis/saba/issues))
 
 ## CONTRIBUTORS
 
-* Jean-Christian Denis
+* Jean-Christian Denis (author)
 
 You are welcome to contribute to this code.
diff --git a/_define.php b/_define.php
index d75f8c6..28de5f2 100644
--- a/_define.php
+++ b/_define.php
@@ -1,32 +1,29 @@
 <?php
 /**
- * @brief saba, a plugin for Dotclear 2
+ * @file
+ * @brief       The plugin saba definition
+ * @ingroup     saba
  *
- * @package Dotclear
- * @subpackage Plugin
+ * @defgroup    saba Plugin saba.
  *
- * @author Jean-Christian Denis and Contributors
+ * Search across blog archive.
  *
- * @copyright Jean-Christian Denis
- * @copyright GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
+ * @author      Jean-Christian Denis
+ * @copyright   GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
  */
-if (!defined('DC_RC_PATH')) {
-    return null;
-}
+declare(strict_types=1);
 
 $this->registerModule(
     'saba',
     'Search across blog archive',
     'Jean-Christian Denis and Contributors',
-    '2023.08.13',
+    '2023.10.20',
     [
-        'requires'    => [['core', '2.27']],
-        'permissions' => dcCore::app()->auth->makePermissions([
-            dcCore::app()->auth::PERMISSION_ADMIN,
-        ]),
-        'type'       => 'plugin',
-        'support'    => 'https://git.dotclear.watch/JcDenis/' . basename(__DIR__) . '/issues',
-        'details'    => 'https://git.dotclear.watch/JcDenis/' . basename(__DIR__) . '/src/branch/master/README.md',
-        'repository' => 'https://git.dotclear.watch/JcDenis/' . basename(__DIR__) . '/raw/branch/master/dcstore.xml',
+        'requires'    => [['core', '2.28']],
+        'permissions' => 'My',
+        'type'        => 'plugin',
+        'support'     => 'https://git.dotclear.watch/JcDenis/' . basename(__DIR__) . '/issues',
+        'details'     => 'https://git.dotclear.watch/JcDenis/' . basename(__DIR__) . '/src/branch/master/README.md',
+        'repository'  => 'https://git.dotclear.watch/JcDenis/' . basename(__DIR__) . '/raw/branch/master/dcstore.xml',
     ]
 );
diff --git a/dcstore.xml b/dcstore.xml
index b78702c..03f8459 100644
--- a/dcstore.xml
+++ b/dcstore.xml
@@ -2,11 +2,11 @@
 <modules xmlns:da="http://dotaddict.org/da/">
   <module id="saba">
     <name>saba</name>
-    <version>2023.08.13</version>
+    <version>2023.10.20</version>
     <author>Jean-Christian Denis and Contributors</author>
     <desc>Search across blog archive</desc>
-    <file>https://git.dotclear.watch/JcDenis/saba/releases/download/v2023.08.13/plugin-saba.zip</file>
-    <da:dcmin>2.27</da:dcmin>
+    <file>https://git.dotclear.watch/JcDenis/saba/releases/download/v2023.10.20/plugin-saba.zip</file>
+    <da:dcmin>2.28</da:dcmin>
     <da:details>https://git.dotclear.watch/JcDenis/saba/src/branch/master/README.md</da:details>
     <da:support>https://git.dotclear.watch/JcDenis/saba/issues</da:support>
   </module>
diff --git a/locales/fr/resources.php b/locales/fr/resources.php
index 5a29f63..6ac4a61 100644
--- a/locales/fr/resources.php
+++ b/locales/fr/resources.php
@@ -1,19 +1,12 @@
 <?php
 /**
- * @brief saba, a plugin for Dotclear 2
+ * @file
+ * @brief       The plugin saba locales resources
+ * @ingroup     saba
  *
- * @package Dotclear
- * @subpackage Plugin
- *
- * @author Jean-Christian Denis and Contributors
- *
- * @copyright Jean-Christian Denis
- * @copyright GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
+ * @author      Jean-Christian Denis
+ * @copyright   GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
  */
-if (!defined('DC_RC_PATH')) {
-    return null;
-}
-
 if (!empty($_REQUEST['module']) && $_REQUEST['module'] == 'saba') {
-    dcCore::app()->resources['help']['core_plugins_conf'] = __DIR__ . '/help/help.html';
+    \Dotclear\App::backend()->resources()->set('help', 'core_plugins_conf', __DIR__ . '/help/help.html');
 }
diff --git a/src/ActivityReportAction.php b/src/ActivityReportAction.php
new file mode 100644
index 0000000..14baf82
--- /dev/null
+++ b/src/ActivityReportAction.php
@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Dotclear\Plugin\saba;
+
+use Dotclear\App;
+use Dotclear\Core\Process;
+use Dotclear\Plugin\activityReport\{
+    Action,
+    ActivityReport,
+    Group
+};
+
+/**
+ * @brief       saba plugin activityReport class.
+ * @ingroup     saba
+ *
+ * Add 404 to activity report
+ *
+ * @author      Jean-Christian Denis (author)
+ * @copyright   GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
+ */
+class ActivityReportAction extends Process
+{
+    public static function init(): bool
+    {
+        return self::status(true);
+    }
+
+    public static function process(): bool
+    {
+        if (!self::status()) {
+            return false;
+        }
+
+        $group = new Group(My::id(), My::name());
+
+        $group->add(new Action(
+            'saba404',
+            __('404 error (saba)'),
+            __('New 404 error page at "%s"'),
+            'sabaBeforeErrorDocument',
+            function () {
+                $logs = [App::blog()->url() . urldecode($_SERVER['QUERY_STRING'])];
+                ActivityReport::instance()->addLog(My::id(), 'saba404', $logs);
+            }
+        ));
+
+        ActivityReport::instance()->groups->add($group);
+
+        return true;
+    }
+}
diff --git a/src/Backend.php b/src/Backend.php
index ce419ee..5500e31 100644
--- a/src/Backend.php
+++ b/src/Backend.php
@@ -1,28 +1,25 @@
 <?php
-/**
- * @brief saba, a plugin for Dotclear 2
- *
- * @package Dotclear
- * @subpackage Plugin
- *
- * @author Jean-Christian Denis and Contributors
- *
- * @copyright Jean-Christian Denis
- * @copyright GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
- */
+
 declare(strict_types=1);
 
 namespace Dotclear\Plugin\saba;
 
-use dcCore;
-use dcSettings;
+use Dotclear\App;
 use Dotclear\Core\Process;
 use Dotclear\Helper\Html\Form\{
     Checkbox,
     Label,
     Para
 };
+use Dotclear\Interface\Core\BlogSettingsInterface;
 
+/**
+ * @brief       saba backend class.
+ * @ingroup     saba
+ *
+ * @author      Jean-Christian Denis
+ * @copyright   GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
+ */
 class Backend extends Process
 {
     public static function init(): bool
@@ -36,9 +33,9 @@ class Backend extends Process
             return false;
         }
 
-        dcCore::app()->addBehaviors([
+        App::behavior()->addBehaviors([
             // add blog preferences form
-            'adminBlogPreferencesFormV2' => function (dcSettings $blog_settings): void {
+            'adminBlogPreferencesFormV2' => function (BlogSettingsInterface $blog_settings): void {
                 echo
                 '<div class="fieldset">' .
                 '<h4 id="saba_params">' . __('Search Across Blog Archive') . '</h4>' .
@@ -60,12 +57,12 @@ class Backend extends Process
                 '</div>';
             },
             // save blog preference form
-            'adminBeforeBlogSettingsUpdate' => function (dcSettings $blog_settings): void {
+            'adminBeforeBlogSettingsUpdate' => function (BlogSettingsInterface $blog_settings): void {
                 $blog_settings->get(My::id())->put('active', !empty($_POST['saba_active']));
                 $blog_settings->get(My::id())->put('error', !empty($_POST['saba_error']));
             },
             // init widget
-            'initWidgets' => [Widgets::class, 'initWidgets'],
+            'initWidgets' => Widgets::initWidgets(...),
         ]);
 
         return true;
diff --git a/src/Frontend.php b/src/Frontend.php
index 5b3685a..0ae5853 100644
--- a/src/Frontend.php
+++ b/src/Frontend.php
@@ -1,22 +1,19 @@
 <?php
-/**
- * @brief saba, a plugin for Dotclear 2
- *
- * @package Dotclear
- * @subpackage Plugin
- *
- * @author Jean-Christian Denis and Contributors
- *
- * @copyright Jean-Christian Denis
- * @copyright GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
- */
+
 declare(strict_types=1);
 
 namespace Dotclear\Plugin\saba;
 
-use dcCore;
+use Dotclear\App;
 use Dotclear\Core\Process;
 
+/**
+ * @brief       saba frontend class.
+ * @ingroup     saba
+ *
+ * @author      Jean-Christian Denis
+ * @copyright   GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
+ */
 class Frontend extends Process
 {
     public static function init(): bool
@@ -30,21 +27,21 @@ class Frontend extends Process
             return false;
         }
 
-        if (My::settings()->get('active')) {
+        if (!My::settings()->get('active')) {
             return false;
         }
 
         if (My::settings()->get('error')) {
-            dcCore::app()->url->registerError([UrlHandler::class, 'error']);
+            App::url()->registerError(UrlHandler::error(...));
         }
 
-        dcCore::app()->tpl->setPath(dcCore::app()->tpl->getPath(), My::path() . DIRECTORY_SEPARATOR . 'default-templates');
+        App::frontend()->template()->setPath(App::frontend()->template()->getPath(), My::path() . DIRECTORY_SEPARATOR . 'default-templates');
 
-        dcCore::app()->addBehaviors([
-            'templateCustomSortByAlias' => [FrontendBehaviors::class, 'templateCustomSortByAlias'],
-            'urlHandlerBeforeGetData'   => [FrontendBehaviors::class, 'urlHandlerBeforeGetData'],
-            'coreBlogBeforeGetPosts'    => [FrontendBehaviors::class, 'coreBlogBeforeGetPosts'],
-            'initWidgets'               => [Widgets::class, 'initWidgets'],
+        App::behavior()->addBehaviors([
+            'templateCustomSortByAlias' => FrontendBehaviors::templateCustomSortByAlias(...),
+            'urlHandlerBeforeGetData'   => FrontendBehaviors::urlHandlerBeforeGetData(...),
+            'coreBlogBeforeGetPosts'    => FrontendBehaviors::coreBlogBeforeGetPosts(...),
+            'initWidgets'               => Widgets::initWidgets(...),
         ]);
 
         return true;
diff --git a/src/FrontendBehaviors.php b/src/FrontendBehaviors.php
index 6d0e11c..cfeb7a4 100644
--- a/src/FrontendBehaviors.php
+++ b/src/FrontendBehaviors.php
@@ -1,26 +1,23 @@
 <?php
-/**
- * @brief saba, a plugin for Dotclear 2
- *
- * @package Dotclear
- * @subpackage Plugin
- *
- * @author Jean-Christian Denis and Contributors
- *
- * @copyright Jean-Christian Denis
- * @copyright GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
- */
+
 declare(strict_types=1);
 
 namespace Dotclear\Plugin\saba;
 
 use ArrayObject;
-use dcCore;
+use Dotclear\App;
 use Dotclear\Helper\Date;
 use Dotclear\Helper\Text;
 
-use context;
+use Dotclear\Core\Frontend\Ctx;
 
+/**
+ * @brief       saba frontend behaviors class.
+ * @ingroup     saba
+ *
+ * @author      Jean-Christian Denis
+ * @copyright   GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
+ */
 class FrontendBehaviors
 {
     public static function templateCustomSortByAlias(ArrayObject $alias): void
@@ -37,9 +34,9 @@ class FrontendBehaviors
         ];
     }
 
-    public static function urlHandlerBeforeGetData(context $_): void
+    public static function urlHandlerBeforeGetData(Ctx $_): void
     {
-        if (is_null(dcCore::app()->blog) || is_null(dcCore::app()->ctx)) {
+        if (!App::blog()->isDefined()) {
             return;
         }
 
@@ -47,11 +44,11 @@ class FrontendBehaviors
 
         if (!empty($_GET['q']) && 1 < strlen($_GET['q'])) {
             # pagintaion
-            $_page_number = dcCore::app()->public->getPageNumber();
+            $_page_number = App::frontend()->getPageNumber();
             if ($_page_number < 1) {
                 $_page_number = 1;
             }
-            $limit = (int) dcCore::app()->ctx->__get('nb_entry_per_page');
+            $limit = (int) App::frontend()->context()->__get('nb_entry_per_page');
 
             $params = [
                 'limit'  => [(($_page_number - 1) * $limit), $limit],
@@ -65,23 +62,23 @@ class FrontendBehaviors
             $options['q'] = rawurldecode($_GET['q']);
 
             # count
-            dcCore::app()->public->search = rawurldecode($_GET['q']);
-            if (dcCore::app()->public->search) {
-                dcCore::app()->public->search_count = dcCore::app()->blog->getPosts($params, true)->f(0);
+            App::frontend()->search = rawurldecode($_GET['q']);
+            if (App::frontend()->search) {
+                App::frontend()->search_count = App::blog()->getPosts($params, true)->f(0);
             }
 
             # get posts
-            $posts = dcCore::app()->blog->getPosts($params);
+            $posts = App::blog()->getPosts($params);
             if ($posts->isEmpty()) { // hack: don't breack context
                 $params = ['limit' => $params['limit']];
-                $posts  = dcCore::app()->blog->getPosts($params);
+                $posts  = App::blog()->getPosts($params);
             }
-            dcCore::app()->ctx->__set('post_params', $params);
-            dcCore::app()->ctx->__set('posts', $posts);
+            App::frontend()->context()->__set('post_params', $params);
+            App::frontend()->context()->__set('posts', $posts);
 
             unset($params);
         }
-        dcCore::app()->ctx->__set('saba_options', $options);
+        App::frontend()->context()->__set('saba_options', $options);
     }
 
     public static function getPostsParams(ArrayObject $params): array
@@ -135,7 +132,7 @@ class FrontendBehaviors
 
         # post types
         if (!empty($get['q_type']) && is_array($get['q_type'])) {
-            $types = dcCore::app()->getPostTypes();
+            $types = App::postTypes()->getPostTypes();
             foreach ($get['q_type'] as $v) {
                 if (!$types[$v]) {
                     continue;
@@ -168,7 +165,7 @@ class FrontendBehaviors
         if (!empty($get['q_user']) && is_array($get['q_user'])) {
             $users = [];
             foreach ($get['q_user'] as $v) {
-                $users[]             = "U.user_id = '" . dcCore::app()->con->escapeStr((string) $v) . "'";
+                $users[]             = "U.user_id = '" . App::con()->escapeStr((string) $v) . "'";
                 $options['q_user'][] = $v;
             }
             $params['sql'] .= 'AND (' . implode(' OR ', $users) . ') ';
@@ -183,7 +180,7 @@ class FrontendBehaviors
         $orders = Utils::getSabaFormOrders();
         if (!empty($get['q_order']) && in_array($get['q_order'], $orders)) {
             $options['q_order'] = $get['q_order'];
-            $params['order']    = dcCore::app()->tpl->getSortByStr(
+            $params['order']    = App::frontend()->template()->getSortByStr(
                 new ArrayObject(['sortby' => $get['q_order'], 'order' => $sort]),
                 'post'
             ); //?! post_type
@@ -211,7 +208,7 @@ class FrontendBehaviors
             $AND   = [];
             $words = Text::splitWords($sentence);
             foreach ($words as $word) {
-                $AND[] = "post_words LIKE '%" . dcCore::app()->con->escapeStr((string) $word) . "%'";
+                $AND[] = "post_words LIKE '%" . App::con()->escapeStr((string) $word) . "%'";
             }
             if (!empty($AND)) {
                 $OR[] = ' (' . implode(' AND ', $AND) . ') ';
diff --git a/src/My.php b/src/My.php
index 8b5e019..60f4ddb 100644
--- a/src/My.php
+++ b/src/My.php
@@ -1,15 +1,5 @@
 <?php
-/**
- * @brief saba, a plugin for Dotclear 2
- *
- * @package Dotclear
- * @subpackage Plugin
- *
- * @author Jean-Christian Denis and Contributors
- *
- * @copyright Jean-Christian Denis
- * @copyright GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
- */
+
 declare(strict_types=1);
 
 namespace Dotclear\Plugin\saba;
@@ -17,8 +7,13 @@ namespace Dotclear\Plugin\saba;
 use Dotclear\Module\MyPlugin;
 
 /**
- * This module definitions.
+ * @brief       saba My helper.
+ * @ingroup     saba
+ *
+ * @author      Jean-Christian Denis
+ * @copyright   GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
  */
 class My extends MyPlugin
 {
+    // Use default permissions
 }
diff --git a/src/Prepend.php b/src/Prepend.php
deleted file mode 100644
index 976be25..0000000
--- a/src/Prepend.php
+++ /dev/null
@@ -1,58 +0,0 @@
-<?php
-/**
- * @brief saba, a plugin for Dotclear 2
- *
- * @package Dotclear
- * @subpackage Plugin
- *
- * @author Jean-Christian Denis and Contributors
- *
- * @copyright Jean-Christian Denis
- * @copyright GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
- */
-declare(strict_types=1);
-
-namespace Dotclear\Plugin\saba;
-
-use dcCore;
-use Dotclear\Core\Process;
-use Dotclear\Plugin\activityReport\{
-    Action,
-    ActivityReport,
-    Group
-};
-
-class Prepend extends Process
-{
-    public static function init(): bool
-    {
-        return self::status(My::checkContext(My::PREPEND));
-    }
-
-    public static function process(): bool
-    {
-        if (!self::status()) {
-            return false;
-        }
-
-        // log frontend page 404 intercepted by saba
-        if (defined('ACTIVITY_REPORT') && ACTIVITY_REPORT == 3) {
-            $group = new Group(My::id(), My::name());
-            $group->add(new Action(
-                'saba404',
-                __('404 error (saba)'),
-                __('New 404 error page at "%s"'),
-                'sabaBeforeErrorDocument',
-                function () {
-                    $url = is_null(dcCore::app()->blog) ? '' : dcCore::app()->blog->url;
-
-                    $logs = [$url . urldecode($_SERVER['QUERY_STRING'])];
-                    ActivityReport::instance()->addLog(My::id(), 'saba404', $logs);
-                }
-            ));
-            ActivityReport::instance()->groups->add($group);
-        }
-
-        return true;
-    }
-}
diff --git a/src/Uninstall.php b/src/Uninstall.php
index 6df4d26..a4649ed 100644
--- a/src/Uninstall.php
+++ b/src/Uninstall.php
@@ -1,23 +1,19 @@
 <?php
-/**
- * @brief saba, a plugin for Dotclear 2
- *
- * @package Dotclear
- * @subpackage Plugin
- *
- * @author Jean-Christian Denis and Contributors
- *
- * @copyright Jean-Christian Denis
- * @copyright GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
- */
+
 declare(strict_types=1);
 
 namespace Dotclear\Plugin\saba;
 
-use dcCore;
 use Dotclear\Core\Process;
 use Dotclear\Plugin\Uninstaller\Uninstaller;
 
+/**
+ * @brief       saba uninstall class.
+ * @ingroup     saba
+ *
+ * @author      Jean-Christian Denis
+ * @copyright   GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
+ */
 class Uninstall extends Process
 {
     public static function init(): bool
@@ -27,7 +23,7 @@ class Uninstall extends Process
 
     public static function process(): bool
     {
-        if (!self::status() || !dcCore::app()->plugins->moduleExists('Uninstaller')) {
+        if (!self::status()) {
             return false;
         }
 
diff --git a/src/UrlHandler.php b/src/UrlHandler.php
index 95a69f4..7b565a4 100644
--- a/src/UrlHandler.php
+++ b/src/UrlHandler.php
@@ -1,24 +1,21 @@
 <?php
-/**
- * @brief saba, a plugin for Dotclear 2
- *
- * @package Dotclear
- * @subpackage Plugin
- *
- * @author Jean-Christian Denis and Contributors
- *
- * @copyright Jean-Christian Denis
- * @copyright GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
- */
+
 declare(strict_types=1);
 
 namespace Dotclear\Plugin\saba;
 
-use dcCore;
-use dcUrlHandlers;
+use Dotclear\App;
+use Dotclear\Core\Frontend\Url;
 use Exception;
 
-class UrlHandler extends dcUrlHandlers
+/**
+ * @brief       saba frontend URL handler class.
+ * @ingroup     saba
+ *
+ * @author      Jean-Christian Denis
+ * @copyright   GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
+ */
+class UrlHandler extends Url
 {
     public static function error(?string $args, string $type, Exception $e): void
     {
@@ -28,7 +25,7 @@ class UrlHandler extends dcUrlHandlers
                 return;
             }
 
-            dcCore::app()->callBehavior('sabaBeforeErrorDocument');
+            App::behavior()->callBehavior('sabaBeforeErrorDocument');
 
             # Clean URI
             $_GET['q']               = implode('%20', $q);
diff --git a/src/Utils.php b/src/Utils.php
index 1d5dc13..071d584 100644
--- a/src/Utils.php
+++ b/src/Utils.php
@@ -1,21 +1,18 @@
 <?php
-/**
- * @brief saba, a plugin for Dotclear 2
- *
- * @package Dotclear
- * @subpackage Plugin
- *
- * @author Jean-Christian Denis and Contributors
- *
- * @copyright Jean-Christian Denis
- * @copyright GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
- */
+
 declare(strict_types=1);
 
 namespace Dotclear\Plugin\saba;
 
-use dcCore;
+use Dotclear\App;
 
+/**
+ * @brief       saba utils class.
+ * @ingroup     saba
+ *
+ * @author      Jean-Christian Denis
+ * @copyright   GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
+ */
 class Utils
 {
     public static function getSabaDefaultPostsOptions(): array
@@ -76,7 +73,7 @@ class Utils
         // todo: add behavior for unknow types
 
         $rs    = [];
-        $types = dcCore::app()->getPostTypes();
+        $types = App::postTypes()->getPostTypes();
 
         foreach ($types as $k => $v) {
             if (!$v['public_url']) {
diff --git a/src/Widgets.php b/src/Widgets.php
index 60f82f3..84f9262 100644
--- a/src/Widgets.php
+++ b/src/Widgets.php
@@ -1,25 +1,21 @@
 <?php
-/**
- * @brief saba, a plugin for Dotclear 2
- *
- * @package Dotclear
- * @subpackage Plugin
- *
- * @author Jean-Christian Denis and Contributors
- *
- * @copyright Jean-Christian Denis
- * @copyright GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
- */
+
 declare(strict_types=1);
 
 namespace Dotclear\Plugin\saba;
 
-use dcCore;
-use dcUtils;
+use Dotclear\App;
 use Dotclear\Helper\Html\Html;
 use Dotclear\Plugin\widgets\WidgetsStack;
 use Dotclear\Plugin\widgets\WidgetsElement;
 
+/**
+ * @brief       saba widgets class.
+ * @ingroup     saba
+ *
+ * @author      Jean-Christian Denis
+ * @copyright   GPL-2.0 https://www.gnu.org/licenses/gpl-2.0.html
+ */
 class Widgets
 {
     /**
@@ -33,7 +29,7 @@ class Widgets
             ->create(
                 'saba',
                 __('Advanced search'),
-                [self::class, 'parseWidget'],
+                self::parseWidget(...),
                 null,
                 __('Add more search options on public side')
             )
@@ -90,23 +86,22 @@ class Widgets
      */
     public static function parseWidget(WidgetsElement $w): string
     {
-        if (is_null(dcCore::app()->blog)
-            || is_null(dcCore::app()->ctx)
-            || !dcCore::app()->blog->settings->get(My::id())->get('active')
-            || !dcCore::app()->blog->settings->get(My::id())->get('error') && dcCore::app()->url->type == '404'
+        if (!App::blog()->isDefined()
+            || !App::blog()->settings()->get(My::id())->get('active')
+            || !App::blog()->settings()->get(My::id())->get('error') && App::url()->type == '404'
             || $w->__get('offline')
         ) {
             return '';
         }
 
-        $saba_options = dcCore::app()->ctx->__get('saba_options') ?? [];
+        $saba_options = App::frontend()->context()->__get('saba_options') ?? [];
         if (!is_array($saba_options) || empty($saba_options)) {
             $saba_options = Utils::getSabaDefaultPostsOptions();
         }
         $res = '';
 
         # advanced search only on search page
-        if (dcCore::app()->url->type == 'search') {
+        if (App::url()->type == 'search') {
             # order
             if (!$w->__get('saba_filter_orders')) {
                 $ct = '';
@@ -182,7 +177,7 @@ class Widgets
             if (!$w->__get('saba_filter_categories')) {
                 $ct = '';
                 $rm = explode(',', $w->__get('saba_remove_categories'));
-                $rs = dcCore::app()->blog->getCategories();
+                $rs = App::blog()->getCategories();
 
                 while ($rs->fetch()) {
                     if (in_array($rs->f('cat_id'), $rm) || in_array($rs->f('cat_url'), $rm)) {
@@ -202,7 +197,7 @@ class Widgets
             if (!$w->__get('saba_filter_authors')) {
                 $ct = '';
                 $rm = explode(',', $w->__get('saba_remove_authors'));
-                $rs = dcCore::app()->blog->getPostsUsers();
+                $rs = App::blog()->getPostsUsers();
 
                 while ($rs->fetch()) {
                     if (in_array($rs->f('user_id'), $rm)) {
@@ -212,7 +207,7 @@ class Widgets
                         '<li><label><input name="q_user[]" type="checkbox" value="%s" %s/> %s</label></li>',
                         $rs->f('user_id'),
                         in_array($rs->f('user_id'), $saba_options['q_user']) ? 'checked="checked" ' : '',
-                        Html::escapeHTML(dcUtils::getUserCN($rs->f('user_id'), $rs->f('user_name'), $rs->f('user_firstname'), $rs->f('user_displayname')))
+                        Html::escapeHTML(App::users()->getUserCN($rs->f('user_id'), $rs->f('user_name'), $rs->f('user_firstname'), $rs->f('user_displayname')))
                     );
                 }
                 if (!empty($ct)) {
@@ -226,7 +221,7 @@ class Widgets
             $w->__get('class'),
             'id="search"',
             ($w->__get('title') ? $w->renderTitle('<label for="q">' . Html::escapeHTML($w->__get('title')) . '</label>') : '') .
-            '<form action="' . dcCore::app()->blog->url . '" method="get" role="search">' .
+            '<form action="' . App::blog()->url() . '" method="get" role="search">' .
             '<p><input type="text" size="10" maxlength="255" id="q" name="q" value="' .
             Html::escapeHTML($saba_options['q']) . '" ' .
             ($w->__get('placeholder') ? 'placeholder="' . Html::escapeHTML($w->__get('placeholder')) . '"' : '') .