title: Firebase Cloud Functions - How to get user that uploads a file?
body: <p>I have an admin web site that uploads files to a specific folder in Firebase Storage.</p>
  
  <p>From a Storage cloud functions, I need to get the authenticated userId from the user that uploads the file. I need this because, when the user uploads the file, the cloud function starts, do some process, and save information in the realtime-database, where I need to save the responsible user of the upload action.</p>
  
  <p>I saw that get user from a realtime-database cloud function is simple (using context.auth.uid), but I did not find any similar solution to storage cloud functions.</p>
  
  <p>Is it possible?</p>
  
  <p>Tks.</p>