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53 lines
1.3 KiB
53 lines
1.3 KiB
2 years ago
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<?php
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// must be called POST validation
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/**
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* Adds rel="nofollow" to all outbound links. This transform is
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* only attached if Attr.Nofollow is TRUE.
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*/
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class HTMLPurifier_AttrTransform_Nofollow 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 $parser;
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public function __construct()
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{
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$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('nofollow', $rels)) {
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$rels[] = 'nofollow';
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}
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$attr['rel'] = implode(' ', $rels);
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} else {
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$attr['rel'] = 'nofollow';
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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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// vim: et sw=4 sts=4
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