Get Identifier field from Firebase Auth Console - firebase

Question

I'm trying to get the email from the user that's currently authenticated using the Facebook Firebase provider. The email is listed under the Identifier field inside the Project's Firebase Authentication Console:
However when I invoke firebase.auth().currentUser the user information loads, however the email field is null. Any ideas on how to get the Identifier (which is where I see the email address) from Firebase? Is this even possible?
Below is the code I'm using:
componentDidMount() {
let user = firebase.auth().currentUser;
let name, email, photoUrl, uid, emailVerified;
if (user !== null) {
name = user.displayName;
email = user.email;
photoUrl = user.photoURL;
emailVerified = user.emailVerified;
uid = user.uid;
console.log(name, email, photoUrl, emailVerified, uid);
}
}
Note: Prevent creation of multiple accounts with the same email address is enabled in Firebase. Also, Facebook API permissions are set to ['public_profile', 'email']

Answer 1

After some testing and debugging I found that the email field will be populated if you're using a regular Firebase Email/Password Sign In method. However, if you're using another Sign In provider method such as Facebook, the email field will appear null (not sure why).
Further inspection of the user object revealed a providerData property.
It's an array that contains all the provider information (including the email address):
So, I updated my code to accommodate this:
componentDidMount() {
let user = firebase.auth().currentUser;
let name, email, photoUrl, uid, emailVerified;
if (user) {
name = user.displayName;
email = user.email;
photoUrl = user.photoURL;
emailVerified = user.emailVerified;
uid = user.uid;
if (!email) {
email = user.providerData[0].email;
}
console.log(name, email, photoUrl, emailVerified, uid);
}
}

Answer 2

In my case, the getEmail() method always returns data for three sign-in possibilities (if user gave authorization to my app to show/use email): Sign in with Email, Sign in with Google, Sign in with Facebook.
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
Log.v(TAG,"user.getEmail():"+user.getEmail());
if (user.getEmail() == null){
// User did not authorize the app to show/user email
}
else {
Log.v(TAG,"user.getEmail():"+user.getEmail());
}