From d215cdb00445d9099ac868e6cd44a2e7db7f974f Mon Sep 17 00:00:00 2001
From: Alexander Ebert <ebert@woltlab.com>
Date: Mon, 4 Mar 2013 18:15:32 +0100
Subject: [PATCH] Added MetaTagHandler (replaces OpenGraphProtocolHandler)

---
 com.woltlab.wcf/coreObject.xml                |   3 +
 com.woltlab.wcf/template/headInclude.tpl      |   4 +-
 .../files/lib/system/MetaTagHandler.class.php | 129 ++++++++++++++++++
 3 files changed, 135 insertions(+), 1 deletion(-)
 create mode 100644 wcfsetup/install/files/lib/system/MetaTagHandler.class.php

diff --git a/com.woltlab.wcf/coreObject.xml b/com.woltlab.wcf/coreObject.xml
index 212aece5ac..9d10bf1928 100644
--- a/com.woltlab.wcf/coreObject.xml
+++ b/com.woltlab.wcf/coreObject.xml
@@ -19,5 +19,8 @@
 		<coreobject>
 			<objectname><![CDATA[wcf\system\user\authentication\UserAuthenticationFactory]]></objectname>
 		</coreobject>
+		<coreobject>
+			<objectname><![CDATA[wcf\system\MetaTagHandler]]></objectname>
+		</coreobject>
 	</import>
 </data>
diff --git a/com.woltlab.wcf/template/headInclude.tpl b/com.woltlab.wcf/template/headInclude.tpl
index 535f55c60a..877918365c 100644
--- a/com.woltlab.wcf/template/headInclude.tpl
+++ b/com.woltlab.wcf/template/headInclude.tpl
@@ -2,7 +2,9 @@
 <meta charset="utf-8" />
 <meta name="description" content="{META_DESCRIPTION}" />
 <meta name="keywords" content="{META_KEYWORDS}" />
-{event name='metaTags'}
+{foreach from=$__wcf->getMetaTagHandler() item=__metaTag}
+	{@$__metaTag}
+{/foreach}
 
 <script type="text/javascript">
 	//<![CDATA[
diff --git a/wcfsetup/install/files/lib/system/MetaTagHandler.class.php b/wcfsetup/install/files/lib/system/MetaTagHandler.class.php
new file mode 100644
index 0000000000..c013734578
--- /dev/null
+++ b/wcfsetup/install/files/lib/system/MetaTagHandler.class.php
@@ -0,0 +1,129 @@
+<?php
+namespace wcf\system;
+use wcf\util\StringUtil;
+
+/**
+ * Handles meta tags.
+ * 
+ * @author	Alexander Ebert
+ * @copyright	2001-2013 WoltLab GmbH
+ * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
+ * @package	com.woltlab.wcf.message
+ * @subpackage	system.message
+ * @category	Community Framework
+ */
+class MetaTagHandler extends SingletonFactory implements \Countable, \Iterator {
+	/**
+	 * current iterator index
+	 * @var	integer
+	 */
+	protected $index = 0;
+	
+	/**
+	 * list of index to object relation
+	 * @var	array<integer>
+	 */
+	protected $indexToObject = null;
+	
+	/**
+	 * regex object
+	 * @var	wcf\system\Regex;
+	 */
+	protected $regex = null;
+	
+	/**
+	 * list of meta tags
+	 * @var	array
+	 */
+	protected $objects = array();
+	
+	/**
+	 * @see	wcf\system\SingletonFactory::init()
+	 */
+	protected function init() {
+		$this->regex = new Regex('^https?://');
+		
+		// set default tags
+		$this->addTag('description', 'description', WCF::getLanguage()->get(META_DESCRIPTION));
+		$this->addTag('keywords', 'keywords', WCF::getLanguage()->get(META_KEYWORDS));
+		$this->addTag('og:site_name', 'og:site_name', WCF::getLanguage()->get(PAGE_TITLE));
+	}
+	
+	/**
+	 * Adds or replaces a meta tag.
+	 * 
+	 * @param	string		$identifier
+	 * @param	string		$name
+	 * @param	string		$value
+	 * @param	boolean		$isProperty
+	 */
+	public function addTag($identifier, $name, $value, $isProperty = false) {
+		if (!$this->regex->match($value)) {
+			$value = StringUtil::encodeHTML($value);
+		}
+		
+		$this->objects[$identifier] = array(
+			'isProperty' => $isProperty,
+			'name' => $name,
+			'value' => $value
+		);
+	}
+	
+	/**
+	 * Removes a meta tag.
+	 * 
+	 * @param	string		$identifier
+	 */
+	public function removeTag($identifier) {
+		if (isset($this->objects[$identifier])) {
+			unset($this->objects[$identifier]);
+		}
+	}
+	
+	/**
+	 * @see	\Countable::count()
+	 */
+	public function count() {
+		return count($this->objects);
+	}
+	
+	/**
+	 * @see	\Iterator::current()
+	 */
+	public function current() {
+		$tag = $this->objects[$this->indexToObject[$this->index]];
+		
+		return '<meta ' . ($tag['isProperty'] ? 'property' : 'name') . '="' . $tag['name'] . '" content="' + $tag['value'] + '" />';
+	}
+	
+	/**
+	 * CAUTION: This methods does not return the current iterator index,
+	 * rather than the object key which maps to that index.
+	 *
+	 * @see	\Iterator::key()
+	 */
+	public function key() {
+		return $this->indexToObject[$this->index];
+	}
+	
+	/**
+	 * @see	\Iterator::next()
+	 */
+	public function next() {
+		++$this->index;
+	}
+	
+	/**
+	 * @see	\Iterator::rewind()
+	 */
+	public function rewind() {
+		$this->index = 0;
+	}
+	
+	/**
+	 * @see	\Iterator::valid()
+	 */
+	public function valid() {
+		return isset($this->indexToObject[$this->index]);
+	}
+}
-- 
2.20.1