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<?php |
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/** |
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* @package s9e\TextFormatter |
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* @copyright Copyright (c) 2010-2017 The s9e Authors |
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* @license http://www.opensource.org/licenses/mit-license.php The MIT License |
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*/ |
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namespace s9e\TextFormatter\Configurator\TemplateNormalizations; |
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use DOMElement; |
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/** |
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* Adds rel="noreferrer" on links that open in a new context that would allow window.opener to be |
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* accessed. |
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* |
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* @link https://mathiasbynens.github.io/rel-noopener/ |
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* @link https://wiki.whatwg.org/wiki/Links_to_Unrelated_Browsing_Contexts |
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*/ |
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class SetRelNoreferrerOnTargetedLinks extends AbstractNormalization |
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{ |
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/** |
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* {@inheritdoc} |
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*/ |
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protected $queries = ['//a', '//area']; |
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/** |
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* Add a rel="noreferrer" attribute to given element |
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* |
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* @param DOMElement $element |
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* @return void |
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*/ |
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protected function addRelAttribute(DOMElement $element) |
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{ |
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$rel = $element->getAttribute('rel'); |
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if (preg_match('(\\S$)', $rel)) |
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{ |
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$rel .= ' '; |
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} |
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$rel .= 'noreferrer'; |
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$element->setAttribute('rel', $rel); |
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} |
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/** |
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* Test whether given link element will let the target access window.opener |
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* |
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* @param DOMElement $element |
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* @return bool |
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*/ |
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protected function linkTargetCanAccessOpener(DOMElement $element) |
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{ |
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// Can't access window.opener if the link doesn't have a target |
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if (!$element->hasAttribute('target')) |
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{ |
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return false; |
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} |
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// Can't access window.opener if the link already has rel="noopener" or rel="noreferrer" |
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if (preg_match('(\\bno(?:open|referr)er\\b)', $element->getAttribute('rel'))) |
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{ |
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return false; |
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} |
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return true; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function normalizeElement(DOMElement $element) |
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{ |
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if ($this->linkTargetCanAccessOpener($element)) |
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{ |
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$this->addRelAttribute($element); |
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} |
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} |
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} |
s9e /
TextFormatter
