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<?php // must be called POST validation /** * Adds rel="noopener" to any links which target a different window * than the current one. This is used to prevent malicious websites * from silently replacing the original window, which could be used * to do phishing. * This transform is controlled by %HTML.TargetNoopener. */ class HTMLPurifier_AttrTransform_TargetNoopener extends HTMLPurifier_AttrTransform { /** * @param array $attr * @param HTMLPurifier_Config $config * @param HTMLPurifier_Context $context * @return array */ public function transform($attr, $config, $context) { if (isset($attr['rel'])) { $rels = explode(' ', $attr['rel']); } else { $rels = array(); } if (isset($attr['target']) && !in_array('noopener', $rels)) { $rels[] = 'noopener'; } if (!empty($rels) || isset($attr['rel'])) { $attr['rel'] = implode(' ', $rels); } return $attr; } }