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   1  <?php
   2  
   3  /**
   4  * @package   s9e\TextFormatter
   5  * @copyright Copyright (c) 2010-2022 The s9e authors
   6  * @license   http://www.opensource.org/licenses/mit-license.php The MIT License
   7  */
   8  namespace s9e\TextFormatter\Configurator\TemplateNormalizations;
   9  
  10  use DOMElement;
  11  
  12  /**
  13  * Add rel="noreferrer" on links that open in a new context that would allow window.opener to be
  14  * accessed.
  15  *
  16  * @link https://mathiasbynens.github.io/rel-noopener/
  17  * @link https://wiki.whatwg.org/wiki/Links_to_Unrelated_Browsing_Contexts
  18  */
  19  class SetRelNoreferrerOnTargetedLinks extends AddAttributeValueToElements
  20  {
  21      /**
  22      * {@inheritdoc}
  23      */
  24  	public function __construct(string $query = '//a[@target] | //area[@target]', string $attrName = 'rel', string $value = 'noreferrer')
  25      {
  26          parent::__construct($query, $attrName, $value);
  27      }
  28  
  29      /**
  30      * {@inheritdoc}
  31      */
  32  	protected function normalizeElement(DOMElement $element): void
  33      {
  34          if (!preg_match('(\\bno(?:open|referr)er\\b)', $element->getAttribute('rel')))
  35          {
  36              parent::normalizeElement($element);
  37          }
  38      }
  39  }