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