Allow switching/impersonating only to particular users in Symfony2

Question

EXPLANATION

Allowing user to switch to any other user is easy in Symfony2. My question is, how to allow certain user to switch only to certain other

Answer 1

If you want to impersonate Admin Users in to Regular user there are some examples :)

https://gist.github.com/1589120

http://symfony.com/doc/current/book/security.html#impersonating-a-user