EmailViewHelper.php

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

/*                                                                        *
 * This script is part of the TYPO3 project - inspiring people to share!  *
 *                                                                        *
 * TYPO3 is free software; you can redistribute it and/or modify it under *
 * the terms of the GNU General Public License version 2 as published by  *
 * the Free Software Foundation.                                          *
 *                                                                        *
 * This script is distributed in the hope that it will be useful, but     *
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN-    *
 * TABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General      *
 * Public License for more details.                                       *
 *                                                                        */
class EmailViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractTagBasedViewHelper
{
    protected $tagName = 'a';

    public function initializeArguments()
    {
        $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($email)
    {
        if ($this->isFrontendAvailable()) {
            list($linkHref, $linkText) = $GLOBALS['TSFE']->cObj->getMailTo($email, '');
            $escapeSpecialCharacters = !isset($GLOBALS['TSFE']->spamProtectEmailAddresses) || $GLOBALS['TSFE']->spamProtectEmailAddresses !== 'ascii';
        } else {
            $linkHref = 'mailto:' . $email;
            $linkText = htmlspecialchars($email);
            $escapeSpecialCharacters = true;
        }
        $tagContent = $this->renderChildren();
        if ($tagContent !== null) {
            $linkText = $tagContent;
        }
        $this->tag->setContent($linkText);
        $this->tag->addAttribute('href', $linkHref, $escapeSpecialCharacters);
        $this->tag->forceClosingTag(true);
        return $this->tag->render();
    }

    protected function isFrontendAvailable()
    {
        return TYPO3_MODE === 'FE';
    }
}