Transform unidentified individuals into authenticated users using Firebase Authentication for Google

Currently, I am integrating Firebase Auth with VueJS and facing the challenge of converting an anonymous authentication user to a registered user using Google.

I have implemented the following code snippet from a reference:

  fromAnonymousToGoogle: function () {
  // Authenticate with the initial user and store it as currentUser
    var previousUser = Firebase.auth().currentUser

  // Authenticate with another method and get the credential
    var credential = Firebase.auth.GoogleAuthProvider()

    previousUser.link(credential)
    .catch(function (error) {
     // Handling cases where linking fails due to already linked account
      alert(error)
    })

    // As OAuth providers authenticate asynchronously, perform account linking in the callback.
    // previousUser = Firebase.auth().currentUser;
    Firebase.auth().signInWithPopup(new Firebase.auth.GoogleAuthProvider())
     .then(function (result) {
       return previousUser.link(result.credential)
     })
     .catch(function (err) {
       // Error handling
       alert(err)
     })
  },

When trying to link the account to Google, I encounter the following error:

[Vue warn]: Error in event handler for "click": "TypeError: this.ta is not a function"

The error mentions this.ta, which is not present in my code. How can I resolve this issue?

Answer №1

In response to your previous question, the reason for the error you're encountering is because when using

var credential = Firebase.auth.GoogleAuthProvider()
, you are actually getting a Provider ID and not a credential. This causes the link() method with the provider ID to fail (I encountered the same error while examining this part of your code).

The goal here is not to sign in the user with Google credentials, as that would result in signing out the anonymous user and signing in with Google instead. What you really want to do is link the current user with Google credentials, which can be achieved by using the linkWithPopup method (I made some variable name changes for clarity).

fromAnonymousToGoogle: function () {
            // Authenticate with the first user then save the currentUser to a local variable
            var anonUser = Firebase.auth().currentUser

            // Authenticate with a second method and get a credential
            var provider = new Firebase.auth.GoogleAuthProvider();

            anonUser.linkWithPopup(provider).then(function(result) {
                googleToken = result.credential;
                console.log(googleToken);
            }).catch(function(error) {
                console.error("Google sign in failed", error);
            });
    },

After testing this approach myself, it seems to be the correct way to link them together using a popup, closely resembling the code you initially provided.

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