[Noob question] User login on server

I have implemented a ‘Add to slack’ workflow in my app that is used to add my slack bot to a slack team.

I want to login the user that has installed the bot automatically to my app. Is there a way to login a user server-side in meteor? Any advice is highly appreciated.

Like on user creation? or post creation user login? this is for fb, but i can’t imagine it would be hughely different? https://medium.com/@jaaaco/add-facebook-login-to-meteor-app-in-2-minutes-3c744b46009e#.pon8q3bxm