From 9c6374b57e900cb15d05c79bcee6d7b2aa46c368 Mon Sep 17 00:00:00 2001
From: Roman <roman@written.ru>
Date: Wed, 6 Apr 2016 09:41:07 +0300
Subject: [PATCH] Support for rel canonical.

---
 _include/Page/Common.php | 2 ++
 _include/Page/HTML.php   | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/_include/Page/Common.php b/_include/Page/Common.php
index 54c285c8..dce53fad 100644
--- a/_include/Page/Common.php
+++ b/_include/Page/Common.php
@@ -297,6 +297,8 @@ private function parse_page_url ($request_uri)
 		if (S2_USE_HIERARCHY && $parent_num && $page['children_exist'] != $was_end_slash)
 			s2_permanent_redirect($current_path.(!$was_end_slash ? '/' : ''));
 
+		$page['canonical_path'] = $current_path.($was_end_slash ? '/' : '');
+
 		$id = $page['id'];
 		$bread_crumbs[] = array(
 			'title' => $page['title']
diff --git a/_include/Page/HTML.php b/_include/Page/HTML.php
index a2d94f4d..5cc235fc 100644
--- a/_include/Page/HTML.php
+++ b/_include/Page/HTML.php
@@ -112,6 +112,8 @@ public function process_template ()
 			$meta_tags[] = '<meta name="keywords" content="'.s2_htmlencode($page['meta_keywords']).'" />';
 		if (!empty($page['meta_description']))
 			$meta_tags[] = '<meta name="description" content="'.s2_htmlencode($page['meta_description']).'" />';
+		if (!empty($page['canonical_path']) && defined('S2_CANONICAL_URL'))
+			$meta_tags[] = '<link rel="canonical" href="' . S2_CANONICAL_URL . s2_htmlencode($page['canonical_path']) . '" />';
 
 		($hook = s2_hook('proc_tpl_pre_meta_merge')) ? eval($hook) : null;
 		$replace['<!-- s2_meta -->'] = implode("\n", $meta_tags);