public static function piwikDownload($file) {
    global $config, $_SERVER;
    include_once($config['rootpath'].'/libs/PiwikTracker.php');
     /* Log visit on piwik */
    $piwikTracker = new PiwikTracker( $config['piwikId'], $config['piwikUri']);
    $piwikTracker->setUrl( $_SERVER['REQUEST_URI'].'/'.$file );
    $piwikTracker->setIp( $_SERVER['REMOTE_ADDR'] );
    $piwikTracker->setTokenAuth( $config['piwikToken'] );
    $lm = loginCM::getInstance();
    if ($lm->o_login) {
      $piwikTracker->setCustomVariable( 1, "LoggedIn", $lm->o_login->username, 'visit');
    }
    $piwikTracker->doTrackAction($_SERVER['REQUEST_URI'].'/'.$file, 'download');
    return true;
  }