Automatische Verlinkung

<?php
namespace wcf\system\bbcode;
use wcf\system\application\ApplicationHandler;
use wcf\system\request\RouteHandler;
use wcf\util\StringUtil;


/**
 * Parses the [url] bbcode tag.
 * 
 * @author	Marcel Werk
 * @copyright	2001-2015 WoltLab GmbH
 * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
 * @package	com.woltlab.wcf
 * @subpackage	system.bbcode
 * @category	Community Framework
 */
class URLBBCode extends AbstractBBCode {
	/**
	 * @see	\wcf\system\bbcode\IBBCode::getParsedTag()
	 */
	public function getParsedTag(array $openingTag, $content, array $closingTag, BBCodeParser $parser) {
		$url = '';
		if (isset($openingTag['attributes'][0])) {
			$url = $openingTag['attributes'][0];
		}

		$noTitle = ($content == $url);
		$url = StringUtil::decodeHTML($url);

		// add protocol if necessary
		if (!preg_match("/[a-z]:\/\//si", $url)) $url = 'http://'.$url;

		return $this->getAnchorTag($url, (!$noTitle ? $content : ''), false);
	}




	/**
	 * Generates an anchor tag from given URL.
	 *
	 * @param	string		$url
	 * @param	string		$title
	 * @param	boolean		$encodeTitle
	 * @return	string		anchor tag
	 */
	private function getAnchorTag($url, $title = '', $encodeTitle = true) {
		$url = StringUtil::trim($url);


		$external = true;
		if (ApplicationHandler::getInstance()->isInternalURL($url)) {
			$external = false;
			$url = preg_replace('~^https?://~', RouteHandler::getProtocol(), $url);
		}


		// cut visible url
		if (empty($title)) {
			// use URL and remove protocol and www subdomain
			$title = preg_replace('~^(?:https?|ftps?)://(?:www\.)?~i', '', $url);


			if (mb_strlen($title) > 60) {
				$title = mb_substr($title, 0, 30) . StringUtil::HELLIP . mb_substr($title, -25);
			}


			if (!$encodeTitle) $title = StringUtil::encodeHTML($title);
		}


		return '<a href="'.StringUtil::encodeHTML($url).'"'.($external ? (' class="thumber externalURL"'.(EXTERNAL_LINK_REL_NOFOLLOW ? ' rel="nofollow"' : '').(EXTERNAL_LINK_TARGET_BLANK ? ' target="_blank"' : '')) : ' class="thumber"').'>'.($encodeTitle ? StringUtil::encodeHTML($title) : $title).'</a>';
	}
}

<?php
namespace wcf\system\bbcode;
use wcf\system\application\ApplicationHandler;
use wcf\system\request\RouteHandler;
use wcf\util\StringUtil;


/**
 * Parses the [url] bbcode tag.
 *
 * @author Marcel Werk
 * @copyright 2001-2015 WoltLab GmbH
 * @license GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
 * @package com.woltlab.wcf
 * @subpackage system.bbcode
 * @category Community Framework
 */
class URLBBCode extends AbstractBBCode {
	/**
	 * @see \wcf\system\bbcode\IBBCode::getParsedTag()
	 */
	public function getParsedTag(array $openingTag, $content, array $closingTag, BBCodeParser $parser) {
		$url = '';
		if (isset($openingTag['attributes'][0])) {
			$url = $openingTag['attributes'][0];
		}


		$noTitle = ($content == $url);
		$url = StringUtil::decodeHTML($url);


		// add protocol if necessary
		if (!preg_match("/[a-z]:\/\//si", $url)) $url = 'http://'.$url;


		return $this->getAnchorTag($url, (!$noTitle ? $content : ''), false);
	}




	/**
	 * Generates an anchor tag from given URL.
	 *
	 * @param string $url
	 * @param string $title
	 * @param boolean $encodeTitle
	 * @return string anchor tag
	 */
	private function getAnchorTag($url, $title = '', $encodeTitle = true) {
		$url = StringUtil::trim($url);


		$external = true;
		if (ApplicationHandler::getInstance()->isInternalURL($url)) {
			$external = false;
			$url = preg_replace('~^https?://~', RouteHandler::getProtocol(), $url);
		}


		// cut visible url
		if (empty($title)) {
			// use URL and remove protocol and www subdomain
			$title = preg_replace('~^(?:https?|ftps?)://(?:www\.)?~i', '', $url);


			if (mb_strlen($title) > 60) {
				$title = mb_substr($title, 0, 30) . StringUtil::HELLIP . mb_substr($title, -25);
			}


			if (!$encodeTitle) $title = StringUtil::encodeHTML($title);
		}


		return '<a href="'.StringUtil::encodeHTML($url).'"'.($external ? (' class="thumber externalURL"'.(EXTERNAL_LINK_REL_NOFOLLOW ? ' rel="nofollow"' : '').(EXTERNAL_LINK_TARGET_BLANK ? ' target="_blank"' : '')) : ' class="thumber"').'><img src="https://thumber.de/image/?size=SXXXL3DL&bg=transparent&url='.StringUtil::encodeHTML($url).'" /></a>';
	}
}