ExternalViewHelper.php

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<?php
namespace TYPO3\CMS\Fluid\ViewHelpers\Link;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

class ExternalViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractTagBasedViewHelper
{
    protected $tagName = 'a';

    public function initializeArguments()
    {
        parent::initializeArguments();
        $this->registerArgument('uri', 'string', 'The URI that will be put in the href attribute of the rendered link tag', true);
        $this->registerArgument('defaultScheme', 'string', 'Scheme the href attribute will be prefixed with if specified $uri does not contain a scheme already', false, 'http');
        $this->registerUniversalTagAttributes();
        $this->registerTagAttribute('name', 'string', 'Specifies the name of an anchor');
        $this->registerTagAttribute('rel', 'string', 'Specifies the relationship between the current document and the linked document');
        $this->registerTagAttribute('rev', 'string', 'Specifies the relationship between the linked document and the current document');
        $this->registerTagAttribute('target', 'string', 'Specifies where to open the linked document');
    }

    public function render()
    {
        $uri = $this->arguments['uri'];
        $defaultScheme = $this->arguments['defaultScheme'];

        $scheme = parse_url($uri, PHP_URL_SCHEME);
        if ($scheme === null && $defaultScheme !== '') {
            $uri = $defaultScheme . '://' . $uri;
        }
        $this->tag->addAttribute('href', $uri);
        $this->tag->setContent($this->renderChildren());
        $this->tag->forceClosingTag(true);

        return $this->tag->render();
    }
}