Firebase将匿名用户帐户转换为永久帐户错误

Question

auth/provider-already-linked
User can only be linked to one identity for the given provider.

这是帐户链接代码。匿名用户已登录。

return firebase.auth().createUserWithEmailAndPassword(email, password).then(newUser => {

    // Credential is being successfully retrieved. Note "any" workaround until typescript updated.
    let credential = (<any>firebase.auth.EmailAuthProvider).credential(email, password);

    firebase.auth().currentUser.link(credential)
        .then(user => { return user; })
        .catch(err => console.log(err)); // Returns auth/provider-already-linked error.
});

Answer 1

不应调用CreateUserWithEmailandPassword来升级匿名用户。这将注册一个新用户，注销当前已签名的匿名用户。

你所需要的只是用户的电子邮件和密码。相反，IDP提供商（如Google、Facebook)将要求完成他们的完整登录流程，以获得他们的令牌来识别用户。不过，我们建议对这些代码使用LinkWithPopup或LinkWithRedirect。

示例：

// (Anonymous user is signed in at that point.)

// 1. Create the email and password credential, to upgrade the
// anonymous user.
var credential = firebase.auth.EmailAuthProvider.credential(email, password);

// 2. Links the credential to the currently signed in user
// (the anonymous user).
firebase.auth().currentUser.linkWithCredential(credential).then(function(user) {
  console.log("Anonymous account successfully upgraded", user);
}, function(error) {
  console.log("Error upgrading anonymous account", error);
});