尝试在 firebase 中链接多个身份验证提供程序时，从 error.email 中获取“未定义”

Question

I'm trying to link multiple auth providers to one account using firebase . The user is trying to create an account with the same address as the Google OAuth account which is already on firebase .

firebase
.auth()
.createUserWithEmailAndPassword(email, password)
.then(async result => {
    if (result.additionalUserInfo.isNewUser) {
        firebase
            .database()
            .ref('/users/' + result.user.uid)
            .set({
                email: email,
                profile_picture: image,
                first_name: firstName,
                last_name: lastName,
                created_at: Date.now()
            })
            .then(snapshot => console.log("do something"))
    } else {
        firebase
            .database()
            .ref('/users/' + result.user.uid)
            .update({
                last_logged_in: Date.now()
            })
            .then(snapshot => console.log("do something"))
    }
})
.catch(error => {
    if (error.code === 'auth/email-already-in-use' || error.code === 'auth/credential-already-in-use' || error.code === 'auth/account-exists-with-different-credential') {
        const pendingCred = error.credential
        const email = error.email
        firebase
            .auth()
            .fetchSignInMethodsForEmail(email)
            .then(methods => {
                switch (methods[0]) {
                    case 'password':
                        // email and password logic
                        break;
                    case 'facebook.com':
                        // facebook logic
                        break;
                    default:
                        break;
                }
            })
        return;
    }
})

The problem is I'm getting the proper error message:

[Error: The email address is already in use by another account.]

and the proper error.code :

auth/email-already-in-use

but, pendingCred or error.email come back undefined .

Update
I took the advise and tried the following:

firebase.auth()
    .EmailAuthProvider
    .credential(email, password)
    .then(result => console.log("result", result))
    .catch(error => console.log(error))

I'm getting the error:

[TypeError: undefined is not an object (evaluating '_firebase.default.auth().EmailAuthProvider.credential')]

Answer 1

You are using createuserwithEmailAndPassword which does not contain error.email or error.credential . According to the documentation to get the error you can either use error.message or error.code :

firebase.auth().createUserWithEmailAndPassword(email, password)
    .catch(function(error) {
  // Handle Errors here.
  var errorCode = error.code;
  var errorMessage = error.message;
  if (errorCode == 'auth/weak-password') {
    alert('The password is too weak.');
  } else {
    alert(errorMessage);
  }
  console.log(error);
});

According to the documentation, the error.email and error.credential is used if you get the following error code:

auth/credential-already-in-use
auth/account-exists-with-different-credential

https://firebase.google.com/docs/reference/js/firebase.auth.Auth#error-codes_5

https://firebase.google.com/docs/reference/js/firebase.auth.Auth.html#sign-inwith-credential