Make an action after login

I have a problem that I want to add variable to session after user login (I use Laravel 5 and its auth by artisan make:auth. It looks like this: user->login->give_him_a_key->logout->delete_key. I make a middleware for this but I realize I can not make middleware run only 1 time when user login, then I go to file AuthenticateUser.php and add my code in function login. My teacher said that not good because i change code of laravel. He asked me try to make it without change code of laravel. But I try but can not find how to catch $request after user login and make it run only 1 time. I need some guideline and thanks for notice. Sorry about my English.

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