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<?php
/**
 * icms_core_StopSpammer object
 *
 * This class is responsible for cross referencing register information with StopForumSpam.com API
 *
 * @copyright   http://www.impresscms.org/ The ImpressCMS Project
 * @license     http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU General Public License (GPL)
 *
 * @category    ICMS
 * @package     Core
 * @subpackage  StopSpammer
 * @since       1.2
 * @author      marcan <marcan@impresscms.org>
 * @author      Sina Asghari (aka stranger) <pesian_stranger@users.sourceforge.net>
 * @version     SVN: $Id: StopSpammer.php 12310 2013-09-13 21:33:58Z skenow $
 */
/**
 * Checks usernames, emails and ip addresses against a blacklist
 *
 *
 * @category    ICMS
 * @package     Core
 *
 */
class icms_core_StopSpammer {
    private $api_url;

    /**
     * Constructor
     */
    public function __construct() {
        // checkin stopforumspam API
        $this->api_url = "http://www.stopforumspam.com/api?";
    }

    /**
     * Check the StopForumSpam API for a specific field (username, email or IP)
     *
     * @param string $field field to check
     * @param string $value value to validate
     * @return true if spammer was found with passed info
     */
    public function checkForField($field, $value) {
        $spam = false;

        $url = $this->api_url . $field . '=' . urlencode($value);
        if (!ini_get('allow_url_fopen')) {
            $output = '';
            $ch = curl_init();
            if (!curl_setopt($ch, CURLOPT_URL, "$url")) {
                icms_core_Debug::message($this->api_url . $field . '=' . $value);
                echo "<script> alert('" . _US_SERVER_PROBLEM_OCCURRED . "'); window.history.go(-1); </script>\n";
            }
            curl_setopt($ch, CURLOPT_URL, "$url");
            curl_setopt($ch, CURLOPT_HEADER,0);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            $output .= curl_exec($ch);
            curl_close($ch);

            if (preg_match("#<appears>(.*)</appears>#i", $output, $out)) {
                $spam = $out[1];
            }
        } else {
            $file = fopen($url, "r");
            if (!$file) {
                icms_core_Debug::message($this->api_url . $field . '=' . $value);
                echo "<script> alert('" . _US_SERVER_PROBLEM_OCCURRED . "'); window.history.go(-1); </script>\n";
            }
            while (!feof($file)) {
                $line = fgets($file, 1024);
                if (preg_match("#<appears>(.*)</appears>#i", $line, $out)) {
                    $spam = $out[1];
                    break;
                }
            }
            fclose($file);
        }
        return $spam == 'yes';
    }

    /**
     * Check the StopForumSpam API for specified username
     *
     * @param string $username username to check
     * @return true if spammer was found with this username
     */
    public function badUsername($username) {
        return $this->checkForField('username', $username);
    }

    /**
     * Check the StopForumSpam API for specified email
     *
     * @param string $email email to check
     * @return true if spammer was found with this email
     */
    public function badEmail($email) {
        return $this->checkForField('email', $email);
    }

    /**
     * Check the StopForumSpam API for specified IP
     *
     * @param string $ip ip to check
     * @return true if spammer was found with this IP
     */
    public function badIP($ip) {
        // return TRUE if it's not a valid IP
        if (!filter_var($ip, FILTER_VALIDATE_IP)) return TRUE;
        // return FALSE if it is a valid IPv6 address - only until IPv6 can be checked without error
        if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
            return FALSE;
        }
        return $this->checkForField('ip', $ip);
    }
}