class.honnypotter.php

<?php

class HonnyPotter
{
  private static $initiated = false;

  public static function init()
  {
    if ( ! self::$initiated ) {
    self::init_hooks();
    }
  }
  public static function init_hooks()
  {
    self::$initiated = true;
    add_filter( 'authenticate', array( 'HonnyPotter', 'auth_signon' ), 1337, 3 );
  }

  public static function auth_signon( $user, $username, $password )
  {
    if(is_wp_error($user))
    {
      if(!empty($username) && !empty($password)){
        if(!username_exists($username)){
          $logname = get_option('honnypotter');
          $logname = $logname['log_name'];
          $logfile = fopen(plugin_dir_path(__FILE__) . $logname, 'a') or die('could not open/create file');
          fwrite($logfile, sprintf("au: %s - %s:%s\n", date('Y-m-d H:i:s') , $username, $password));
          fclose($logfile);
        }
      }
    }
    return $user;
}

  public static function options_init()
  {
  	$random_log_file_name = $rand = substr(md5(microtime()),rand(0,17),14) . '.log';
  	$array['log_name'] = $random_log_file_name;
  	$array['wp_authenticate_override'] = false;
  	update_option('honnypotter', $array);
  }
}