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<?php |
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/** |
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* @author Christoph Wurst <[email protected]> |
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* @author Thomas Müller <[email protected]> |
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* |
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* Mail |
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* |
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* This code is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Affero General Public License, version 3, |
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* as published by the Free Software Foundation. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Affero General Public License for more details. |
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* |
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* You should have received a copy of the GNU Affero General Public License, version 3, |
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* along with this program. If not, see <http://www.gnu.org/licenses/> |
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* |
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*/ |
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namespace OCA\Mail\Service\HtmlPurify; |
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use HTMLPurifier_AttrTransform; |
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use HTMLPurifier_Config; |
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use HTMLPurifier_Context; |
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use HTMLPurifier_URIParser; |
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/** |
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* Adds rel="noreferrer" to all outbound links. |
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*/ |
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class TransformNoReferrer extends HTMLPurifier_AttrTransform |
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{ |
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/** |
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* @type HTMLPurifier_URIParser |
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*/ |
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private $parser; |
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public function __construct() { |
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$this->parser = new HTMLPurifier_URIParser(); |
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} |
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/** |
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* @param array $attr |
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* @param HTMLPurifier_Config $config |
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* @param HTMLPurifier_Context $context |
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* @return array |
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*/ |
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public function transform($attr, $config, $context) |
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{ |
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if (!isset($attr['href'])) { |
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return $attr; |
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} |
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// XXX Kind of inefficient |
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$url = $this->parser->parse($attr['href']); |
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$scheme = $url->getSchemeObj($config, $context); |
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if ($scheme->browsable && !$url->isLocal($config, $context)) { |
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if (isset($attr['rel'])) { |
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$rels = explode(' ', $attr['rel']); |
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if (!in_array('noreferrer', $rels)) { |
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$rels[] = 'noreferrer'; |
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} |
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$attr['rel'] = implode(' ', $rels); |
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} else { |
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$attr['rel'] = 'noreferrer'; |
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} |
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} |
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return $attr; |
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} |
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} |
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owncloud /
mail
