How do you detect if a user is coming from Salesforce1 (SF1) in a lightning component?

Hi All,

I’m developing a lightning app that users will be accessing via desktop and through Salesforce1. I’ve been using the $Browser variable to detect if the user is coming from mobile but that only works if they are accessing the page via a web browser on their phone and not the SF1 mobile app. It seems the $User.getTheme and $UserInfo.getUiTheme() functionality only works in visualforce pages.