ttrss/lib/htmlpurifier/library/HTMLPurifier/AttrTransform/Nofollow.php

46 lines
1.1 KiB
PHP
Raw Normal View History

<?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, $context);
2012-04-28 12:37:51 +00:00
if ($scheme->browsable && !$url->isLocal($config, $context)) {
if (isset($attr['rel'])) {
2012-04-28 12:37:51 +00:00
$rels = explode(' ', $attr);
if (!in_array('nofollow', $rels)) {
$rels[] = 'nofollow';
}
$attr['rel'] = implode(' ', $rels);
} else {
$attr['rel'] = 'nofollow';
}
}
return $attr;
}
}
// vim: et sw=4 sts=4