SafeIframe.php

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<?php
 
class HTMLPurifier_URIFilter_SafeIframe extends HTMLPurifier_URIFilter
{
    public $name = 'SafeIframe';
 
    public $always_load = true;
 
    protected $regexp = null;
 
    // XXX: The not so good bit about how this is all set up now is we
    // can't check HTML.SafeIframe in the 'prepare' step: we have to
    // defer till the actual filtering.
    public function prepare($config)
    {
        $this->regexp = $config->get('URI.SafeIframeRegexp');
        return true;
    }
 
    public function filter(&$uri, $config, $context)
    {
        // check if filter not applicable
        if (!$config->get('HTML.SafeIframe')) {
            return true;
        }
        // check if the filter should actually trigger
        if (!$context->get('EmbeddedURI', true)) {
            return true;
        }
        $token = $context->get('CurrentToken', true);
        if (!($token && $token->name == 'iframe')) {
            return true;
        }
        // check if we actually have some whitelists enabled
        if ($this->regexp === null) {
            return false;
        }
        // actually check the whitelists
        return preg_match($this->regexp, $uri->toString());
    }
}
 
// vim: et sw=4 sts=4