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htmlpurifier/library/HTMLPurifier/AttrTransform/Nofollow.php
Edward Z. Yang 8c80349f9d Implement HTML.Nofollow for external links.
Signed-off-by: Edward Z. Yang <ezyang@mit.edu>
2010-09-28 12:01:57 -04:00

42 lines
941 B
PHP

<?php
// must be called POST validation
/**
* Adds rel="nofollow" to all outbound links. This transform is
* only attached if Attr.Nofollow is TRUE.
*/
class HTMLPurifier_AttrTransform_Nofollow extends HTMLPurifier_AttrTransform
{
private $parser;
public function __construct() {
$this->parser = new HTMLPurifier_URIParser();
}
public function transform($attr, $config, $context) {
if (!isset($attr['href'])) {
return $attr;
}
// XXX Kind of inefficient
$url = $this->parser->parse($attr['href']);
$scheme = $url->getSchemeObj($config, $context);
if (!is_null($url->host) && $scheme !== false && $scheme->browsable) {
if (isset($attr['rel'])) {
$attr['rel'] .= ' nofollow';
} else {
$attr['rel'] = 'nofollow';
}
}
return $attr;
}
}
// vim: et sw=4 sts=4