Is there a way to get the Role of the current User

Hi :)
We build a plugin which has a elaborate configuration. To get to the configuration page, we added a button to our app. The Problem is, that every user can see this button for now, but the plan is to display this button only to moderators and admins. I looked at the manifest file if we could get the role from the context, but all i could find were "username", "usermail" and "userlanguage". So how could we determine if a user is a "normal" user or an mod/admin.

Thx in advance
Chris