From eb577a09e55d7c9ac98d3932f9142310ccfef594 Mon Sep 17 00:00:00 2001
From: Giuseppe Di Terlizzi <giuseppe.diterlizzi@gmail.com>
Date: Mon, 12 Dec 2016 23:57:13 +0100
Subject: [PATCH] Added initial support for Open Graph protocol

---
 action.php           | 24 ++++++++++++++++++++++++
 conf/default.php     |  1 +
 conf/metadata.php    |  1 +
 helper.php           | 20 +++++++++++++++++++-
 lang/en/settings.php | 11 ++++++-----
 plugin.info.txt      |  2 +-
 6 files changed, 52 insertions(+), 7 deletions(-)

diff --git a/action.php b/action.php
index 8fb7576..db6886d 100644
--- a/action.php
+++ b/action.php
@@ -47,6 +47,10 @@ class action_plugin_semantic extends DokuWiki_Action_Plugin {
       $controller->register_hook('TPL_METAHEADER_OUTPUT', 'BEFORE', $this, 'meta_dublin_core');
     }
 
+    if ($this->getConf('useOpenGraph')) {
+      $controller->register_hook('TPL_METAHEADER_OUTPUT', 'BEFORE', $this, 'meta_open_graph');
+    }
+
     if ($this->getConf('exposeWebService')) {
       $controller->register_hook('AJAX_CALL_UNKNOWN', 'BEFORE', $this, 'ajax');
     }
@@ -168,6 +172,26 @@ class action_plugin_semantic extends DokuWiki_Action_Plugin {
   }
 
 
+  public function meta_open_graph(Doku_Event &$event, $params) {
+
+    global $ID;
+
+    $this->helper->getMetadata($ID);
+
+    foreach ($this->helper->getOpenGraph() as $property => $content) {
+
+      if (! $content) continue;
+
+      $event->data['meta'][] = array(
+        'property' => $property,
+        'content'  => $content,
+      );
+
+    }
+
+  }
+
+
   public function meta_dublin_core(Doku_Event &$event, $params) {
 
     global $ID;
diff --git a/conf/default.php b/conf/default.php
index 22b909a..84a2c1b 100644
--- a/conf/default.php
+++ b/conf/default.php
@@ -11,4 +11,5 @@ $conf['exposeWebService']     = 1;
 $conf['useMetaDescription']   = 1;
 $conf['useMetaAuthor']        = 1;
 $conf['useDublinCore']        = 0;
+$conf['useOpenGraph']         = 0;
 $conf['excludedPages']        = '(wiki|playground)';
diff --git a/conf/metadata.php b/conf/metadata.php
index b0eec13..f1ba43d 100644
--- a/conf/metadata.php
+++ b/conf/metadata.php
@@ -8,6 +8,7 @@
 $meta['useMetaDescription']   = array('onoff');
 $meta['useMetaAuthor']        = array('onoff');
 $meta['useDublinCore']        = array('onoff');
+$meta['useOpenGraph']         = array('onoff');
 $meta['useJSONLD']            = array('onoff');
 $meta['exposeWebService']     = array('onoff');
 $meta['defaultSchemaOrgType'] = array('multichoice','_choices' => array('Article', 'NewsArticle', 'TechArticle', 'BlogPosting', 'Recipe'));
diff --git a/helper.php b/helper.php
index a30501b..fdb7dbb 100644
--- a/helper.php
+++ b/helper.php
@@ -52,7 +52,7 @@ class helper_plugin_semantic extends DokuWiki_Plugin {
 
     if (! $auth_check) return false;
 
-    $this->meta = p_get_metadata($page);
+    $this->meta = p_get_metadata($this->page);
 
     if (isset($this->meta['plugin']['semantic']['enabled']) && ! $this->meta['plugin']['semantic']['enabled']) {
       return false;
@@ -268,4 +268,22 @@ class helper_plugin_semantic extends DokuWiki_Plugin {
 
   }
 
+
+  public function getOpenGraph() {
+
+    global $conf;
+
+    if (! $this->meta) return array();
+
+    $open_graph = array(
+      'og:title'       => $this->getTitle(),
+      'og:description' => str_replace("\n", ' ', $this->getDescription()),
+      'og:url'         => wl($this->page, '', true),
+      'og:type'        => 'website',
+    );
+
+    return $open_graph;
+
+  }
+
 }
diff --git a/lang/en/settings.php b/lang/en/settings.php
index d8df7a6..b7c8dda 100644
--- a/lang/en/settings.php
+++ b/lang/en/settings.php
@@ -7,10 +7,11 @@
  */
 
 // for the configuration manager
-$lang['useMetaDescription']   = 'Add description meta tag';
-$lang['useMetaAuthor']        = 'Add author meta tag';
-$lang['useDublinCore']        = 'Add Dublin Core metadata';
-$lang['useJSONLD']            = 'Add JSON-LD';
 $lang['defaultSchemaOrgType'] = 'Default Schema.org type for JSON-LD';
 $lang['excludedPages']        = 'Excluded pages (insert a regex)';
-$lang['exposeWebService']     = 'Expose Ajax WebService';
\ No newline at end of file
+$lang['exposeWebService']     = 'Expose Ajax WebService';
+$lang['useDublinCore']        = 'Add Dublin Core metadata';
+$lang['useJSONLD']            = 'Add JSON-LD';
+$lang['useMetaAuthor']        = 'Add author meta tag';
+$lang['useMetaDescription']   = 'Add description meta tag';
+$lang['useOpenGraph']         = 'Add Open Graph protocol metadata';
diff --git a/plugin.info.txt b/plugin.info.txt
index a942603..b5ea617 100644
--- a/plugin.info.txt
+++ b/plugin.info.txt
@@ -1,7 +1,7 @@
 base semantic
 author Giuseppe Di Terlizzi
 email giuseppe.diterlizzi@gmail.com
-date 2016-10-03
+date 2016-12-12
 name Semantic Plugin
 desc Add Semantic Data in DokuWiki
 url http://www.dokuwiki.org/plugin:semantic