Symfony - 获取targetPath信息

I have an application that provide to User an activation of service under a link. When user go to route:

www.mysite.com/user/active_service/1

Symfony check if the User are logged, if not redirect to login/register page. But I want customized this welcome page with the kind of service requested (id=1 in the route).

How can I get that information in the login/register action?

I do with this:

$targetPath = $request->getSession()->get('_security.main.target_path'); 

if(preg_match("/\/match\/[0-9]+$/", $targetPath))
{
   //do somethings
};

and adding a pregmatch to targetPath, for know if the request is the request for that I want customize my welcome view.