Seo4Ajax Filter for Laravel 4

filters.php

/*
|--------------------------------------------------------------------------
| Seo4Ajax Filter
|--------------------------------------------------------------------------
|
| The following filter is used to load html from SEO4AJAX.com and 
| serve it specifically to search engine / social networking bots. 
| EXAMPLE - Route::get('/', array('before' => 'seo4ajax', 'uses' => 'controller@index'));
|
*/

Route::filter('seo4ajax', function()
{
	$authKey = 'YOUR SITES AUTH KEY';
	$UserAgentsToMatch = '/bot|crawler|spider|archiver|pinterest|facebookexternalhit|flipboardproxy|slurp/i';
	$UserAgentsNotToMatch = '/google.*bot|bing|msnbot|yandexbot|pinterest.*ios|mail\.ru/i';
	if (isset($_SERVER['QUERY_STRING']) && preg_match('/_escaped_fragment_=/i', $_SERVER['QUERY_STRING'])) {
		return file_get_contents("http://api.seo4ajax.com/".$authKey.$_SERVER['REQUEST_URI']);
	}
	if (isset($_SERVER['HTTP_USER_AGENT']) && !preg_match($UserAgentsNotToMatch, $_SERVER['HTTP_USER_AGENT']) && preg_match($UserAgentsToMatch, $_SERVER['HTTP_USER_AGENT'])) {
		return file_get_contents("http://api.seo4ajax.com/".$authKey.$_SERVER['REQUEST_URI']);
	}
});