LinkTypes.php

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<?php

class HTMLPurifier_AttrDef_HTML_LinkTypes extends HTMLPurifier_AttrDef
{

    protected $name;

    public function __construct($name) {
        $configLookup = array(
            'rel' => 'AllowedRel',
            'rev' => 'AllowedRev'
        );
        if (!isset($configLookup[$name])) {
            trigger_error('Unrecognized attribute name for link '.
                'relationship.', E_USER_ERROR);
            return;
        }
        $this->name = $configLookup[$name];
    }

    public function validate($string, $config, $context) {

        $allowed = $config->get('Attr.' . $this->name);
        if (empty($allowed)) return false;

        $string = $this->parseCDATA($string);
        $parts = explode(' ', $string);

        // lookup to prevent duplicates
        $ret_lookup = array();
        foreach ($parts as $part) {
            $part = strtolower(trim($part));
            if (!isset($allowed[$part])) continue;
            $ret_lookup[$part] = true;
        }

        if (empty($ret_lookup)) return false;
        $string = implode(' ', array_keys($ret_lookup));

        return $string;

    }

}

// vim: et sw=4 sts=4