actualiza plugin de blog y agrega plugin de meta

19 files changed, 445 insertions, 21 deletions

diff --git a/platform/www/conf/local.php b/platform/www/conf/local.php
index 1bce6c7..02d9b84 100644
--- a/platform/www/conf/local.php
+++ b/platform/www/conf/local.php
@@ -3,7 +3,7 @@
  * Dokuwiki's Main Configuration File - Local Settings
  * Auto-generated by config plugin
  * Run for user: admin
- * Date: Sat, 29 Oct 2022 19:28:07 -0300
+ * Date: Wed, 14 Jun 2023 14:32:18 -0300
  */
 
 $conf['title'] = 'The Acervus Project';
diff --git a/platform/www/conf/local.php.bak.php b/platform/www/conf/local.php.bak.php
index 643d9e4..5274331 100644
--- a/platform/www/conf/local.php.bak.php
+++ b/platform/www/conf/local.php.bak.php
@@ -3,7 +3,7 @@
  * Dokuwiki's Main Configuration File - Local Settings
  * Auto-generated by config plugin
  * Run for user: admin
- * Date: Tue, 13 Sep 2022 18:26:55 -0300
+ * Date: Wed, 14 Jun 2023 12:05:14 -0300
  */
 
 $conf['title'] = 'The Acervus Project';
@@ -21,8 +21,13 @@ $conf['mailfrom'] = 'info@acerv.us';
 $conf['updatecheck'] = 0;
 $conf['userewrite'] = '1';
 $conf['plugin']['authldap']['attributes'] = array();
-$conf['plugin']['mdpage']['flavor'] = 'markdown-extra';
-$conf['plugin']['mdpage']['markdown_default'] = 1;
+$conf['plugin']['blog']['sortorder'] = 'ascending';
+$conf['plugin']['include']['showfooter'] = 0;
+$conf['plugin']['include']['showdate'] = 0;
+$conf['plugin']['include']['showuser'] = 0;
+$conf['plugin']['include']['showcomments'] = 0;
+$conf['plugin']['include']['showlinkbacks'] = 0;
+$conf['plugin']['include']['showtags'] = 0;
 $conf['plugin']['pageredirect']['show_note'] = 0;
 $conf['plugin']['translation']['translations'] = 'en es';
 $conf['plugin']['translation']['display'] = 'langcode,name';
@@ -32,4 +37,6 @@ $conf['plugin']['translation']['copytrans'] = 1;
 $conf['tpl']['acervus']['numberedHeading'] = 1;
 $conf['tpl']['acervus']['tocPosition'] = 'dokuwiki';
 $conf['tpl']['acervus']['footer'] = 'footer';
+$conf['plugin']['mdpage']['flavor'] = 'markdown-extra';
+$conf['plugin']['mdpage']['markdown_default'] = '1';
 $conf['plugin']['fastwiki']['save'] = '1';
diff --git a/platform/www/conf/plugins.local.php b/platform/www/conf/plugins.local.php
index 4f256a9..61e3661 100644
--- a/platform/www/conf/plugins.local.php
+++ b/platform/www/conf/plugins.local.php
@@ -6,3 +6,4 @@
  * NOTE: Plugins will not be added to this file unless there is a need to override a default setting. Plugins are
  *       enabled by default.
  */
+$plugins['blog.old'] = 0;
diff --git a/platform/www/conf/plugins.local.php.bak b/platform/www/conf/plugins.local.php.bak
index e510413..a3f474b 100644
--- a/platform/www/conf/plugins.local.php.bak
+++ b/platform/www/conf/plugins.local.php.bak
@@ -6,4 +6,4 @@
  * NOTE: Plugins will not be added to this file unless there is a need to override a default setting. Plugins are
  *       enabled by default.
  */
-$plugins['markdowku'] = 0;
+$plugins['meta.old'] = 0;
diff --git a/platform/www/lib/plugins/blog/action.php b/platform/www/lib/plugins/blog/action.php
index 61ffd9e..2328399 100644
--- a/platform/www/lib/plugins/blog/action.php
+++ b/platform/www/lib/plugins/blog/action.php
@@ -88,8 +88,7 @@ class action_plugin_blog extends DokuWiki_Action_Plugin {
         global $ID, $INFO;
 
         $ns    = cleanID($_REQUEST['ns']);
-        $title = str_replace(':', '', $_REQUEST['title']);
-        $ID    = $this->_newEntryID($ns, $title);
+        $ID    = $this->_newEntryID($ns, $_REQUEST['title']);
         $INFO  = pageinfo();
 
         // check if we are allowed to create this file
@@ -210,6 +209,7 @@ class action_plugin_blog extends DokuWiki_Action_Plugin {
                     );
         }
         $pre = strftime($dateprefix);
+        $title = str_replace([':', ';', '#', '&', '%', '/', '\\', '?'], '', $title);
         return cleanID(($ns ? $ns.':' : '').$pre.$title);
     }
 
diff --git a/platform/www/lib/plugins/blog/helper.php b/platform/www/lib/plugins/blog/helper.php
index 9dd8b9a..f29dc7b 100644
--- a/platform/www/lib/plugins/blog/helper.php
+++ b/platform/www/lib/plugins/blog/helper.php
@@ -70,7 +70,7 @@ class helper_plugin_blog extends DokuWiki_Plugin {
 
             // skip drafts unless for users with create priviledge
             $meta = p_get_metadata($id, '', false);
-            $draft = ($meta['type'] == 'draft');
+            $draft = isset($meta['type']) && ($meta['type'] == 'draft');
             if ($draft && ($perm < AUTH_CREATE)) continue;
 
             // filter by author
diff --git a/platform/www/lib/plugins/blog/lang/ca/lang.php b/platform/www/lib/plugins/blog/lang/ca/lang.php
new file mode 100644
index 0000000..9acf319
--- /dev/null
+++ b/platform/www/lib/plugins/blog/lang/ca/lang.php
@@ -0,0 +1,30 @@
+<?php
+
+/**
+ * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
+ *
+ * @author Marc Zulet <marczulet@gmail.com>
+ */
+$lang['blog']                  = 'Bloc';
+$lang['older']                 = 'Entrades anteriors';
+$lang['newer']                 = 'Entrades noves';
+$lang['newentry']              = 'Nova entrada al bloc:';
+$lang['missing_includeplugin'] = 'El plugin Include ha d\'estar instal·lat perquè el bloc funcioni correctament.';
+$lang['missing_pagelistplugin'] = 'El plugin Pagelist ha d\'estar instal·lat perquè funcionin els llistats d\'arxiu.';
+$lang['missing_tagplugin']     = 'El plugin Tag ha d\'estar instal·lat perquè funcionin les etiquetes.';
+$lang['autoarchive']           = '%1$d Publicació(ns) de %2$s %3$s';
+$lang['month_01']              = 'Gener';
+$lang['month_02']              = 'Febrer';
+$lang['month_03']              = 'Març';
+$lang['month_04']              = 'Abril';
+$lang['month_05']              = 'Maig';
+$lang['month_06']              = 'Juny';
+$lang['month_07']              = 'Juliol';
+$lang['month_08']              = 'Agost';
+$lang['month_09']              = 'Setembre';
+$lang['month_10']              = 'Octubre';
+$lang['month_11']              = 'Novembre';
+$lang['month_12']              = 'Desembre';
+$lang['entries']               = 'entrades';
+$lang['entry']                 = 'entrada';
+$lang['archive_title']         = 'Històric';
diff --git a/platform/www/lib/plugins/blog/lang/ca/settings.php b/platform/www/lib/plugins/blog/lang/ca/settings.php
new file mode 100644
index 0000000..0f9a49d
--- /dev/null
+++ b/platform/www/lib/plugins/blog/lang/ca/settings.php
@@ -0,0 +1,27 @@
+<?php
+
+/**
+ * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
+ *
+ * @author Marc Zulet <marczulet@gmail.com>
+ */
+$lang['namespace']             = 'namespace predeterminat per al bloc';
+$lang['formposition']          = 'posició del formulari de nova entrada';
+$lang['formposition_o_top']    = 'amunt';
+$lang['formposition_o_bottom'] = 'avall';
+$lang['formposition_o_none']   = 'cap';
+$lang['newentrytitle']         = 'títol del formulari de nova entrada';
+$lang['dateprefix']            = 'afegir un prefix de data a les publicacions noves';
+$lang['sortkey']               = 'ordenar entrades per';
+$lang['sortkey_o_cdate']       = 'data de creació';
+$lang['sortkey_o_mdate']       = 'data de modificació';
+$lang['sortkey_o_pagename']    = 'nom de la pàgina';
+$lang['sortkey_o_id']          = 'ID de la pàgina';
+$lang['sortkey_o_title']       = 'títol';
+$lang['sortorder']             = 'ordre';
+$lang['sortorder_o_ascending'] = 'ascendent';
+$lang['sortorder_o_descending'] = 'descendent';
+$lang['excluded_pages']        = 'exclou determinades pàgines de la llista de blocs (es requereix una expressió regular)';
+$lang['showhistogram']         = 'Mostra l\'histograma en la representació de l\'arxiu';
+$lang['max_months']            = 'Màxim de mesos per mostrar a l\'histograma';
+$lang['histogram_height']      = 'Alçada de l\'histograma (en píxels)';
diff --git a/platform/www/lib/plugins/blog/lang/es/lang.php b/platform/www/lib/plugins/blog/lang/es/lang.php
index 68ef65a..6eba94a 100644
--- a/platform/www/lib/plugins/blog/lang/es/lang.php
+++ b/platform/www/lib/plugins/blog/lang/es/lang.php
@@ -2,8 +2,9 @@
 
 /**
  * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
- * 
- * @author     Herman Fabián Sandoval Manrique <hfsandovalm@emzac.com>
+ *
+ * @author Marc Zulet <marczulet@gmail.com>
+ * @author Herman Fabián Sandoval Manrique <hfsandovalm@emzac.com>
  * @author r0sk <r0sk10@gmail.com>
  */
 $lang['blog']                  = 'Blog';
@@ -13,6 +14,7 @@ $lang['newentry']              = 'Nueva entrada en el blog:';
 $lang['missing_includeplugin'] = 'El plugin Include debe estar instalado para que el blog funcione.';
 $lang['missing_pagelistplugin'] = 'El plugin Pagelist debe estar instalado para que funcionen los listados de archivo.';
 $lang['missing_tagplugin']     = 'El plugin Tag debe estar instalado para que funcionen los tags.';
+$lang['autoarchive']           = '%1$d Entrada(s) de %2$s %3$s';
 $lang['month_01']              = 'Enero';
 $lang['month_02']              = 'Febrero';
 $lang['month_03']              = 'Marzo';
diff --git a/platform/www/lib/plugins/blog/lang/es/settings.php b/platform/www/lib/plugins/blog/lang/es/settings.php
index d86f15a..05d62f0 100644
--- a/platform/www/lib/plugins/blog/lang/es/settings.php
+++ b/platform/www/lib/plugins/blog/lang/es/settings.php
@@ -2,8 +2,9 @@
 
 /**
  * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
- * 
- * @author     Herman Fabián Sandoval Manrique <hfsandovalm@emzac.com>
+ *
+ * @author Marc Zulet <marczulet@gmail.com>
+ * @author Herman Fabián Sandoval Manrique <hfsandovalm@emzac.com>
  * @author r0sk <r0sk10@gmail.com>
  */
 $lang['namespace']             = 'namespace predeterminado para el blog';
@@ -12,6 +13,7 @@ $lang['formposition_o_top']    = 'arriba';
 $lang['formposition_o_bottom'] = 'abajo';
 $lang['formposition_o_none']   = 'ninguna';
 $lang['newentrytitle']         = 'título del formulario de nueva entrada';
+$lang['dateprefix']            = 'prefijar la fecha a los ID de entradas nuevas';
 $lang['sortkey']               = 'ordenar entradas por';
 $lang['sortkey_o_cdate']       = 'fecha de creación';
 $lang['sortkey_o_mdate']       = 'fecha de modificación';
@@ -21,3 +23,7 @@ $lang['sortkey_o_title']       = 'título';
 $lang['sortorder']             = 'ordenamiento';
 $lang['sortorder_o_ascending'] = 'ascendente';
 $lang['sortorder_o_descending'] = 'descendente';
+$lang['excluded_pages']        = 'excluir ciertas páginas de la lista de blogs (se requiere una expresión regular)';
+$lang['showhistogram']         = 'Mostrar histograma en la página del archivo';
+$lang['max_months']            = 'Máximo de meses para mostrar en el histograma';
+$lang['histogram_height']      = 'Altura del histograma (en píxeles)';
diff --git a/platform/www/lib/plugins/blog/lang/pt-br/lang.php b/platform/www/lib/plugins/blog/lang/pt-br/lang.php
index bd219ba..a163727 100644
--- a/platform/www/lib/plugins/blog/lang/pt-br/lang.php
+++ b/platform/www/lib/plugins/blog/lang/pt-br/lang.php
@@ -3,6 +3,7 @@
 /**
  * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
  *
+ * @author Felipo Antonoff <contato@codemarket.com.br>
  * @author Flávio Roberto Santos <flavio.barata@gmail.com>
  * @author Samory Pereira Santos <samory.santos@gmail.com>
  */
@@ -13,6 +14,7 @@ $lang['newentry']              = 'Novo registro do blog:';
 $lang['missing_includeplugin'] = 'O plugin Inlude deve estar instalado para que o blog funcione.';
 $lang['missing_pagelistplugin'] = 'O plugin Pagelist deve estar instalado para que a listagem de arquivo funcione,';
 $lang['missing_tagplugin']     = 'O plugin Tag deve estar instalado para usar refinamentos de etiquetagem.';
+$lang['autoarchive']           = '%1$d Postagem(s) para %2$s %3$s';
 $lang['month_01']              = 'Janeiro';
 $lang['month_02']              = 'Fevereiro';
 $lang['month_03']              = 'Março';
diff --git a/platform/www/lib/plugins/blog/lang/vi/lang.php b/platform/www/lib/plugins/blog/lang/vi/lang.php
new file mode 100644
index 0000000..a397709
--- /dev/null
+++ b/platform/www/lib/plugins/blog/lang/vi/lang.php
@@ -0,0 +1,30 @@
+<?php
+
+/**
+ * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
+ *
+ * @author Minh <phandinhminh@protonmail.ch>
+ */
+$lang['blog']                  = 'Blog';
+$lang['older']                 = 'Những bài viết cũ hơn';
+$lang['newer']                 = 'Những bài viết mới hơn';
+$lang['newentry']              = 'Mục blog mới:';
+$lang['missing_includeplugin'] = 'Tiện ích Plugin \'Bao gồm\' phải được cài đặt để blog hoạt động.';
+$lang['missing_pagelistplugin'] = 'Tiện ích Plugin \'Danh sách trang\' phải được cài đặt để danh sách lưu trữ hoạt động.';
+$lang['missing_tagplugin']     = 'Tiện ích Plugin \'Tag\' phải được cài đặt để sử dụng sàng lọc Tag.';
+$lang['autoarchive']           = '%1$d (các) bài đăng cho %2$s %3$s';
+$lang['month_01']              = 'Tháng Một';
+$lang['month_02']              = 'Tháng Hai';
+$lang['month_03']              = 'Tháng Ba';
+$lang['month_04']              = 'Tháng Tư';
+$lang['month_05']              = 'Tháng Năm';
+$lang['month_06']              = 'Tháng Sáu';
+$lang['month_07']              = 'Tháng Bảy';
+$lang['month_08']              = 'Tháng Tám';
+$lang['month_09']              = 'Tháng Chín';
+$lang['month_10']              = 'Tháng Mười';
+$lang['month_11']              = 'Tháng Mười Một';
+$lang['month_12']              = 'Tháng Mười Hai';
+$lang['entries']               = 'các mục bài viết';
+$lang['entry']                 = 'nhập';
+$lang['archive_title']         = 'Lịch sử Blog';
diff --git a/platform/www/lib/plugins/blog/lang/vi/settings.php b/platform/www/lib/plugins/blog/lang/vi/settings.php
new file mode 100644
index 0000000..a0b7d49
--- /dev/null
+++ b/platform/www/lib/plugins/blog/lang/vi/settings.php
@@ -0,0 +1,27 @@
+<?php
+
+/**
+ * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
+ *
+ * @author Minh <phandinhminh@protonmail.ch>
+ */
+$lang['namespace']             = 'không gian tên namespace mặc định cho blog';
+$lang['formposition']          = 'vị trí của mẫu nhập mới';
+$lang['formposition_o_top']    = 'đầu';
+$lang['formposition_o_bottom'] = 'cuối';
+$lang['formposition_o_none']   = 'trống';
+$lang['newentrytitle']         = 'tiêu đề của mẫu nhập mới';
+$lang['dateprefix']            = 'ngày tiền tố cho ID mục nhập mới';
+$lang['sortkey']               = 'sắp xếp các bài đăng blog theo';
+$lang['sortkey_o_cdate']       = 'ngày tạo';
+$lang['sortkey_o_mdate']       = 'ngày chỉnh sửa';
+$lang['sortkey_o_pagename']    = 'tên trang';
+$lang['sortkey_o_id']          = 'ID trang';
+$lang['sortkey_o_title']       = 'tiêu đề';
+$lang['sortorder']             = 'sắp xếp vị trí';
+$lang['sortorder_o_ascending'] = 'tăng dần';
+$lang['sortorder_o_descending'] = 'giảm dần';
+$lang['excluded_pages']        = 'loại trừ một số trang nhất định khỏi danh sách blog (yêu cầu diễn đạt thông thường)';
+$lang['showhistogram']         = 'Hiển thị biểu đồ trên báo cáo kết xuất lưu trữ';
+$lang['max_months']            = 'Số tháng tối đa để hiển thị trong biểu đồ';
+$lang['histogram_height']      = 'Chiều cao của biểu đồ (tính bằng pixel)';
diff --git a/platform/www/lib/plugins/blog/manager.dat b/platform/www/lib/plugins/blog/manager.dat
deleted file mode 100644
index 1eadc20..0000000
--- a/platform/www/lib/plugins/blog/manager.dat
+++ /dev/null
@@ -1,2 +0,0 @@
-downloadurl=https://github.com/dokufreaks/plugin-blog/archive/master.zip
-installed=Sat, 19 Mar 2022 15:05:39 +0000
diff --git a/platform/www/lib/plugins/blog/plugin.info.txt b/platform/www/lib/plugins/blog/plugin.info.txt
index 73bd83c..8f35668 100644
--- a/platform/www/lib/plugins/blog/plugin.info.txt
+++ b/platform/www/lib/plugins/blog/plugin.info.txt
@@ -2,7 +2,7 @@
 base   blog
 author Michael Hamann, Michael Klier, Gina Haeussge
 email  michael@content-space.de
-date   2022-02-20
+date   2023-01-12
 name   Blog
 desc   Use DokuWiki as blogging tool. (previous authors: Esther Brunner)
 url    https://www.dokuwiki.org/plugin:blog
diff --git a/platform/www/lib/plugins/blog/syntax/blog.php b/platform/www/lib/plugins/blog/syntax/blog.php
index 2ca56d8..fd934a0 100644
--- a/platform/www/lib/plugins/blog/syntax/blog.php
+++ b/platform/www/lib/plugins/blog/syntax/blog.php
@@ -22,11 +22,11 @@ class syntax_plugin_blog_blog extends DokuWiki_Syntax_Plugin {
         global $ID;
 
         $match = substr($match, 7, -2); // strip {{blog> from start and }} from end
-        list($match, $flags) = explode('&', $match, 2);
+        list($match, $flags) = array_pad(explode('&', $match, 2), 2, null);
         $flags =  explode('&', $flags);
         array_unshift($flags, 'link'); // always make the first header of a blog entry a permalink (unless nolink is set)
-        list($match, $refine) = explode(' ', $match, 2);
-        list($ns, $num) = explode('?', $match, 2);
+        list($match, $refine) = array_pad(explode(' ', $match, 2), 2, null);
+        list($ns, $num) = array_pad(explode('?', $match, 2), 2, null);
 
         if (!is_numeric($num)) {
             if (is_numeric($ns)) {
@@ -46,9 +46,11 @@ class syntax_plugin_blog_blog extends DokuWiki_Syntax_Plugin {
     }
 
     function render($mode, Doku_Renderer $renderer, $data) {
+        global $INPUT;
+
         list($ns, $num, $flags, $refine) = $data;
 
-        $first = $_REQUEST['first'];
+        $first = $INPUT->int('first');
         if (!is_numeric($first)) $first = 0;
 
         // get the blog entries for our namespace
@@ -121,9 +123,9 @@ class syntax_plugin_blog_blog extends DokuWiki_Syntax_Plugin {
         // now include the blog entries
         foreach ($entries as $entry) {
             if ($mode == 'xhtml' || $mode == 'code') {
-                if(auth_quickaclcheck($entry['id']) >= AUTH_READ) {
+                if(isset($entry['id']) && (auth_quickaclcheck($entry['id']) >= AUTH_READ)) {
                     // prevent blog include loops
-                    if(!$this->included_pages[$entry['id']]) {
+                    if(!array_key_exists($entry['id'], $this->included_pages) || !$this->included_pages[$entry['id']]) {
                         $this->included_pages[$entry['id']] = true;
                         $renderer->nest($include->_get_instructions($entry['id'], '', 'page', $clevel, $include_flags));
                         $this->included_pages[$entry['id']] = false;
diff --git a/platform/www/lib/plugins/meta/_test/rendering.test.php b/platform/www/lib/plugins/meta/_test/rendering.test.php
new file mode 100644
index 0000000..3c39613
--- /dev/null
+++ b/platform/www/lib/plugins/meta/_test/rendering.test.php
@@ -0,0 +1,80 @@
+<?php
+// must be run within Dokuwiki
+if (!defined('DOKU_INC')) die();
+
+/**
+ * Test cases for the meta plugin
+ */
+class plugin_meta_rendering_test extends DokuWikiTest {
+
+    public function setUp() : void {
+        $this->pluginsEnabled[] = 'meta';
+        parent::setUp();
+    }
+
+    public function test_meta_description() {
+        $text = "My page content";
+        saveWikiText('description_test', $text, 'Created');
+        self::assertEquals($text, p_get_metadata('description_test', 'description abstract', METADATA_RENDER_UNLIMITED));
+
+        $text .= DOKU_LF . '~~META:description abstract=My abstract~~';
+
+        saveWikiText('description_test', $text, 'Added meta');
+
+        self::assertEquals('My abstract', p_get_metadata('description_test', 'description abstract', METADATA_RENDER_UNLIMITED));
+
+        $text .= DOKU_LF . '~~META:description foobar=bar~~';
+        saveWikiText('description_test', $text, 'Updated meta');
+        self::assertEquals('My abstract', p_get_metadata('description_test', 'description abstract', METADATA_RENDER_UNLIMITED));
+        self::assertEquals('bar', p_get_metadata('description_test', 'description foobar', METADATA_RENDER_UNLIMITED));
+    }
+
+    public function test_meta_description_with_persistent_description() {
+        $text = "My page content";
+        $id = 'description_test';
+        saveWikiText($id, $text, 'Created');
+        self::assertEquals($text, p_get_metadata($id, 'description abstract', METADATA_RENDER_UNLIMITED));
+
+        p_set_metadata($id, array('description' => array('abstract' => 'Persistent description')), false, true);
+        self::assertEquals('Persistent description', p_get_metadata($id, 'description abstract', METADATA_RENDER_UNLIMITED));
+
+        $text .= DOKU_LF . '~~META:description abstract=My abstract~~';
+
+        saveWikiText($id, $text, 'Added meta');
+
+        self::assertEquals('My abstract', p_get_metadata($id, 'description abstract', METADATA_RENDER_UNLIMITED));
+
+        $text .= DOKU_LF . '~~META:description foobar=bar~~';
+        saveWikiText($id, $text, 'Updated meta');
+        self::assertEquals('My abstract', p_get_metadata($id, 'description abstract', METADATA_RENDER_UNLIMITED));
+        self::assertEquals('bar', p_get_metadata($id, 'description foobar', METADATA_RENDER_UNLIMITED));
+    }
+
+    public function test_relation_references_with_link() {
+        $text = "My page with a [[link_target|Link]].";
+        $id = "source";
+
+        saveWikiText($id, $text, 'Created');
+
+        self::assertEquals(array('link_target' => false), p_get_metadata($id, 'relation references', METADATA_RENDER_UNLIMITED));
+
+        $text .= DOKU_LF. "~~META:relation references=foo~~";
+        saveWikiText($id, $text, 'Updated');
+
+        self::assertEquals(array('foo' => false, 'link_target' => false), p_get_metadata($id, 'relation references', METADATA_RENDER_UNLIMITED));
+    }
+
+    public function test_relation_references_without_link() {
+        $text = "My page without a link.";
+        $id = "source";
+
+        saveWikiText($id, $text, 'Created');
+
+        self::assertEquals(null, p_get_metadata($id, 'relation references', METADATA_RENDER_UNLIMITED));
+
+        $text .= DOKU_LF . "~~META:relation references=foo~~";
+        saveWikiText($id, $text, 'Updated');
+
+        self::assertEquals(array('foo' => false), p_get_metadata($id, 'relation references', METADATA_RENDER_UNLIMITED));
+    }
+}
diff --git a/platform/www/lib/plugins/meta/plugin.info.txt b/platform/www/lib/plugins/meta/plugin.info.txt
new file mode 100644
index 0000000..b1e63e4
--- /dev/null
+++ b/platform/www/lib/plugins/meta/plugin.info.txt
@@ -0,0 +1,7 @@
+base   meta
+author Michael Hamann
+email  michael@content-space.de
+date   2021-10-16
+name   Meta plugin
+desc   Set Metadata for the current page. (previous authors: Esther Brunner, Gina Häußge, Michael Klier)
+url    https://www.dokuwiki.org/plugin:meta
diff --git a/platform/www/lib/plugins/meta/syntax.php b/platform/www/lib/plugins/meta/syntax.php
new file mode 100644
index 0000000..733e5b5
--- /dev/null
+++ b/platform/www/lib/plugins/meta/syntax.php
@@ -0,0 +1,205 @@
+<?php
+/**
+ * Meta Plugin: Sets metadata for the current page
+ *
+ * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
+ * @author     Esther Brunner <wikidesign@gmail.com>
+ */
+if(!defined('DOKU_INC')) define('DOKU_INC',realpath(dirname(__FILE__).'/../../').'/');
+if(!defined('DOKU_PLUGIN')) define('DOKU_PLUGIN',DOKU_INC.'lib/plugins/');
+require_once(DOKU_PLUGIN.'syntax.php');
+
+/**
+ * All DokuWiki plugins to extend the parser/rendering mechanism
+ * need to inherit from this class
+ */
+class syntax_plugin_meta extends DokuWiki_Syntax_Plugin
+{
+    function getType()
+    {
+        return 'substition';
+    }
+
+    function getSort()
+    {
+        return 99;
+    }
+
+    function connectTo($mode)
+    {
+        $this->Lexer->addSpecialPattern('~~META:.*?~~',$mode,'plugin_meta');
+    }
+
+    /**
+     * Handle the match
+     */
+    public function handle($match, $state, $pos, Doku_Handler $handler)
+    {
+        // strip ~~META: from start and ~~ from end
+        $match = substr($match,7,-2);
+
+        $data = array();
+        $pairs = explode('&', $match);
+        foreach ($pairs as $pair) {
+            list($key, $value) = explode('=', $pair, 2);
+            list($key, $subkey) = explode(' ', $key, 2);
+            if (trim($subkey)) {
+                $data[trim($key)][trim($subkey)] = trim($value);
+            } else {
+                $data[trim($key)] = trim($value);
+            }
+        }
+        $data = array_change_key_case($data, CASE_LOWER);
+
+        return $data;
+    }
+
+    /**
+     * Create output
+     */
+    public function render($mode, Doku_Renderer $renderer, $data)
+    {
+        if ($mode == 'xthml') {
+            // don't output anything
+            return true;
+        } elseif ($mode == 'metadata') {
+            /** @var Doku_Renderer_metadata $renderer */
+
+            // do some validation / conversion for date metadata
+            if (isset($data['date'])) {
+                if (is_array($data['date'])) {
+                    foreach ($data['date'] as $key => $date) {
+                        $date = $this->convertDate(trim($date));
+                        if (!$date) {
+                            unset($data['date'][$key]);
+                        } else {
+                            $data['date'][$key] = $date;
+                        }
+                    }
+                } else {
+                    unset($data['date']);
+                }
+            }
+
+            // now merge the arrays
+            $protected = array('description', 'date', 'contributor');
+            foreach ($data as $key => $value) {
+
+                // be careful with sub-arrays of $meta['relation']
+                if ($key == 'relation') {
+                    foreach ($value as $subkey => $subvalue) {
+                        if ($subkey == 'media') {
+                            $renderer->meta[$key][$subkey][cleanID($subvalue)] = @file_exists(mediaFN($subvalue));
+                        } elseif ($subkey == 'firstimage') {
+                            /* The metadata renderer overrides the first image value with its internal value at the end.
+                            Therefore the only thing we can do is setting this internal value by calling _firstimage.
+                            This fails if there has already been a first image saved. */
+                            $renderer->_firstimage($subvalue);
+                        } else {
+                            // for everything else assume that we have a page id
+                            $renderer->meta[$key][$subkey][cleanID($subvalue)] = page_exists($subvalue);
+                        }
+                    }
+                } elseif (in_array($key, $protected)) {
+                    // be careful with some sensitive arrays of $meta
+                    if (is_array($renderer->meta) && is_array($value) && array_key_exists($key, $renderer->meta)) {
+                       $renderer->meta[$key] = array_merge($renderer->meta[$key], (array)$value);
+                    } else {
+                        $renderer->meta[$key] = $value;
+                    }
+                } else {
+                    // no special treatment for the rest
+                    $renderer->meta[$key] = $value;
+                }
+            }
+        }
+    }
+
+    /**
+     * converts YYYY-MM-DD[ hh:mm:ss][ -> [YYYY-MM-DD ]hh:mm:ss] to PHP timestamps
+     */
+    private function convertDate($date)
+    {
+        list($start, $end) = explode('->', $date, 2);
+
+        if (!$end) {
+            // single date
+            list($date, $time) = explode(' ', trim($start), 2);
+            if (!preg_match('/\d{4}\-\d{2}\-\d{2}/', $date)) {
+                return false;
+            }
+            $time = $this->autocompleteTime($time);
+            return strtotime($date.' '.$time);
+        } else {
+            // duration
+
+            // start
+            list($startdate, $starttime) = explode(' ', trim($start), 2);
+            $startdate = $this->autocompleteDate($startdate);
+            if (!$startdate) {
+                return false;
+            }
+            $starttime = $this->autocompleteTime($starttime);
+
+            // end
+            list($enddate, $endtime) = explode(' ', trim($end), 2);
+            if (!trim($endtime)) {
+                // only time given
+                $end_date = $this->autocompleteDate($enddate, true);
+                if (!$end_date) {
+                    $endtime = $this->autocompleteTime($enddate, true);
+                    $enddate = $startdate;
+                } else {
+                    // only date given
+                    $enddate = $end_date;
+                    $endtime = '23:59:59';
+                }
+            } else {
+                $enddate = $this->autocompleteDate($enddate, true);
+                if (!$enddate) {
+                    $enddate = $startdate;
+                }
+                $endtime = $this->autocompleteTime($endtime, true);
+            }
+
+            $start = strtotime($startdate.' '.$starttime);
+            $end   = strtotime($enddate.' '.$endtime);
+            if (!$start || !$end) {
+                return false;
+            }
+            return array('start' => $start, 'end' => $end);
+        }
+    }
+
+    private function autocompleteDate($date, $end=false)
+    {
+        if (!preg_match('/^\d{4}\-\d{2}\-\d{2}$/', $date)) {
+            if (preg_match('/^\d{4}\-\d{2}$/', $date)) {
+                // we don't know which month
+                return ($end) ? $date.'-28' : $date.'-01';
+            } elseif (preg_match('/^\d{4}$/', $date)) {
+                return ($end) ? $date.'-12-31' : $date.'-01-01';
+            } else {
+                return false;
+            }
+        } else {
+            return $date;
+        }
+    }
+
+    private function autocompleteTime($time, $end=false)
+    {
+        if (!preg_match('/^\d{2}:\d{2}:\d{2}$/', $time)) {
+            if (preg_match('/^\d{2}:\d{2}$/', $time)) {
+                return ($end) ? $time.':59' : $time.':00';
+            } elseif (preg_match('/^\d{2}$/', $time)) {
+                return ($end) ? $time.':59:59': $time.':00:00';
+            } else {
+                return ($end) ? '23:59:59' : '00:00:00';
+            }
+        } else {
+            return $time;
+        }
+    }
+}
+// vim:ts=4:sw=4:et:enc=utf-8: