Some Firebase code

inventorymgmt.js

var appURI = "https://flickering-fire-3648.firebaseio.com/";

var imRef = new Firebase(appURI);
var uid = null;

var auth = new FirebaseSimpleLogin(imRef, function(error, user) {
  if (error) { console.log(error) }
  else if(user) {
    uid = user.uid;
    userRef = imRef.child('users').child(user.uid);
    userRef.once('value', function(snap) {
      if (snap.val() === null) {
        // create a user profile if it doesn't already exist
        userRef.set({displayName: user.email, provider: user.provider, provider_id: user.id});
      }
    });
  }
});