kohana before for open grabp

before.php

public function before(){
		parent::before();
				
		// this block provides header information for facebook send message popup
		if( preg_match('/facebook/', $_SERVER['HTTP_USER_AGENT'])) {
			$facebook_config = kohana::$config->load('facebook');
			$share = $facebook_config['share'][$this->lang];
			
			$item_id = $this->request->query('id');
			$media = ORM::factory('Media', $item_id)->as_array();
			
			$meta['type'] = "website";
			$meta['title'] = $share['caption'];
			
			$meta['image'] = url::site() . "assets/img/sb_logo.jpg";
			if( $media['type'] == 'image' ) {
				$meta['image'] = url::site() . "/media/uploads/images/approved/" . $item_id . ".jpg";
			} else if( $media['type'] == 'video' ) {
				$meta['image'] = url::site() . "/media/uploads/images/bumper/" . $item_id . ".jpg";
			}
			
			$meta['description'] = $share['description'];
			$meta['url'] = url::site() . "share/?id=" . $item_id;
			
			echo '<meta property="fb:app_id" content="' . $facebook_config['app_id'] .'"/>' . "\n";
			echo '<meta property="og:type" content="' . $meta['type'] . '" />' . "\n";
			echo '<meta property="og:title" content="' . $meta['title'] . '"/>' . "\n";
			echo '<meta property="og:image" content="' . $meta['image'] . '"/>' . "\n"; 
			echo '<meta property="og:description" content="' . $meta['description'] . '"/>' . "\n"; 
			echo '<meta property="og:url" content="' . $meta['url'] . '"/>' . "\n"; 
			
			die();
		}
	}