Use more robot field on multi site magento

IndexController.php

<?php
/**
 * Created by PhpStorm.
 * User: chan
 * Date: 21/09/2015
 * Time: 16:04
 */
require_once 'Mage/Cms/controllers/IndexController.php';


class Forix_Custom_IndexController extends Mage_Cms_IndexController {
    /**
     * Render CMS 404 Not found page
     *
     * @param string $coreRoute
     */
    public function noRouteAction($coreRoute = null)
    {
        if($_SERVER["REQUEST_URI"]=="/robots.txt"){
            switch($_SERVER["SERVER_NAME"]){
                case "sub1.oursite.local":
                case "sub1.oursite.com"://Sub domain use other file                 
                {
                    $file = Mage::getBaseDir(). "/robots_other.txt";
                    break;
                }
                default:{//default domain use other file
                    $file = Mage::getBaseDir(). "/robots_default.txt";
                }
            }
            if(file_exists($file)){
                $this->getResponse ()
                    ->setHttpResponseCode ( 200 )
                    ->setHeader ( 'Content-type', 'text' );
                $this->getResponse ()->clearBody ();
                $this->getResponse ()->sendHeaders ();
                readfile ( $file );
                exit;
            }
        }
        return parent::noRouteAction($coreRoute);
    }
}

robots_default.txt

User-agent: Googlebot
Disallow:
User-agent: Googlebot-image
Disallow:

User-agent: *
# Directories
Disallow: /404/
Disallow: /app/
Disallow: /manage/
Disallow: /cgi-bin/
Disallow: /downloader/
Disallow: /includes/
Disallow: /js/
Disallow: /lib/
Disallow: /magento/
Disallow: /media/
Allow: /media/catalog/product/
Disallow: /pkginfo/
Disallow: /report/
Disallow: /scripts/
Disallow: /shell/
Disallow: /skin/
Disallow: /stats/
Disallow: /var/

# Paths (clean URLs)
Disallow: /catalog/product_compare/
Disallow: /catalog/category/view/
Disallow: /catalog/product/view/
Disallow: /catalog/product/gallery/
Disallow: /catalogsearch/
Disallow: /checkout/
Disallow: /control/
Disallow: /contacts/
Disallow: /customer/
Disallow: /customize/
Disallow: /newsletter/
Disallow: /poll/
Disallow: /review/
Disallow: /sendfriend/
Disallow: /tag/
Disallow: /wishlist/
Disallow: /index.php
Disallow: /tag/

Disallow: /cron.php
Disallow: /cron.sh
Disallow: /error_log
Disallow: /install.php
Disallow: /LICENSE.html
Disallow: /LICENSE.txt
Disallow: /LICENSE_AFL.txt
Disallow: /RELEASE_NOTES.txt
Disallow: /STATUS.txt
Disallow: /get.php
Disallow: /.sample$
Disallow: /mage
Disallow: /.js$
Disallow: /?___from_store=
Disallow: *___from_store=
Disallow: /?mode=
Disallow: /?limit=
Disallow: /?dir=
Disallow: /.css$
Disallow: /.php$
Disallow: /.ico$
Disallow: /?p=*&
Disallow: /?SID=
Disallow: /rss*
Disallow: /home/
Disallow: /home-page/

sitemap: http://oursite.local/sitemap.xml