HostBlacklist.php

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<?php

class HTMLPurifier_URIFilter_HostBlacklist extends HTMLPurifier_URIFilter
{
    public $name = 'HostBlacklist';
    protected $blacklist = array();
    public function prepare($config) {
        $this->blacklist = $config->get('URI.HostBlacklist');
        return true;
    }
    public function filter(&$uri, $config, $context) {
        foreach($this->blacklist as $blacklisted_host_fragment) {
            if (strpos($uri->host, $blacklisted_host_fragment) !== false) {
                return false;
            }
        }
        return true;
    }
}

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