The most secure method for retrieving User Id in AngularFire2

I'm currently facing a dilemma in determining the most secure method to obtain an authenticated user's uid using AngularFire2. There seem to be two viable approaches available, but I am uncertain about which one offers the best security measures or if there are specific requirements that need to be met beforehand.

Method 1: Utilize the auth variable

constructor(private afAuth: AngularFireAuth) { 
    let uid = this.afAuth.auth.currentUser.uid
}

Method 2: Subscribe to authState

constructor(private afAuth: AngularFireAuth) { 
    let uid = this.afAuth.authState.subscribe(user => user.uid)
}
javascriptangulartypescriptfirebaseangularfire2

Answer №1

For method 2, it seems like you might be searching for something similar to this.

constructor(private afAuth: AngularFireAuth) { 
  this.afAuth.authState.subscribe(user => {
    if(user) {
      this.uid = user.uid;
    } else {
      // Reset the value when the user signs out
      this.uid = null;
    }
  });
}

This approach is preferable over method 1 because with the first method, you are assigning the variable "uid" to a subscription rather than the actual uid value. I have also included a check to confirm the existence of the user before accessing the uid property.

The issue with the initial option is that if the user logs out and then logs back in with a different account, the uid will remain unchanged. However, the latter option subscribes to the auth state, avoiding this problem.

I trust this information proves helpful!

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