在Firebase Auth#onAuthStateChanged上获取Facebook/Google访问令牌? [英] Get Facebook/Google access token on Firebase Auth#onAuthStateChanged?

问题描述

如果我使用Auth#signInWithPopup进行身份验证，则会得到具有凭据的结果.

If I authenticate using Auth#signInWithPopup I get a result having credentials.

如何在Auth#onStateChanged的观察者内部获取相同的凭据?

How can I get the same credentials inside the observer for Auth#onStateChanged?

推荐答案

您无法从Auth#onStateChanged获取凭据.您只能从Auth#signInWithPopup或Auth#getRedirectResult的结果中获取它们.由于这些字段仅在登录时获得一次，并且不由Firebase Auth维护或存储(例如，OAuth凭证，其他IdP数据)，因此它们仅在登录完成后返回.

You can't get the credentials from Auth#onStateChanged. You can only get them from the result of Auth#signInWithPopup or Auth#getRedirectResult. As these fields are only obtained once on sign-in and not maintained or stored by Firebase Auth (eg. OAuth credential, additional IdP data), they are only returned on sign-in completion.

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