Question

在Firebase中使用reauthenticate()的

The example仅显示如何重新验证使用电子邮件和密码签名的用户：

AuthCredential credential = EmailAuthProvider.getCredential("user@example.com", "password1234");
FirebaseAuth.getInstance().getCurrentUser().reauthenticate(credential);

我也知道如何使用Facebook提供商（credential = FacebookAuthProvider.getCredential(AccessToken.getCurrentAccessToken().toString())）重新进行身份验证。

问题是Google API中没有等效方法来获取当前的访问令牌并最终得到AuthCredential。那么在这种情况下我应该传递给getCredential()？

Answer 1

我知道这是个老问题，但是我没有找到完整的答案。这是在Android上执行的方法。

FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
// Get the account
GoogleSignInAccount acct = GoogleSignIn.getLastSignedInAccount(context);
if (acct != null) {
     AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
     user.reauthenticate(credential).addOnCompleteListener(new OnCompleteListener<Void>() {
        @Override
        public void onComplete(@NonNull Task<Void> task) {
            if (task.isSuccessful()) {
                Log.d(TAG, "Reauthenticated.");
            }
        }
     });
}

Answer 2

考虑到您将收到GoogleSignInResult作为对登录的回复，我认为您可以使用以下代码：

// assuming result variable has GoogleSignInResult
// GoogleSignInResult result 

// Get the account
GoogleSignInAccount acct = result.getSignInAccount();

// credential
AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
FirebaseAuth.getInstance().getCurrentUser().reauthenticate(credential).addOnCompleteListener(new OnCompleteListener<Void>() {...

Answer 3

您可以通过2种方式获取GoogleSignInResult进行身份验证。

i）通过在谷歌登录界面输入电子邮件ID和密码。

ii）从手机中已登录的帐户中选择帐户。

我使用第二种方法获取访问令牌并验证用户身份。

以获得更多支持参考链接。

google sign in link 1

Stackoverflow - token refresh

google auth provider documentation

server side token verification docs

如果您唯一的目标是获取令牌，那么您也可以尝试this github source。

GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
    .requestEmail()
    .build();

//使用登录选项构建api客户端权限。

mGoogleApiClient = new GoogleApiClient.Builder(this)
    .enableAutoManage(this /* FragmentActivity */, this /* OnConnectionFailedListener */)
    .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
    .build();
private void signIn() {
Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
startActivityForResult(signInIntent,RC_SIGN_IN); }

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// Result returned from launching the Intent from    GoogleSignInApi.getSignInIntent(...);
if (requestCode == RC_SIGN_IN){
    GoogleSignInResult result =Auth.GoogleSignInApi.getSignInResultFromIntent(data);
    handleSignInResult(result);
    }


private void handleSignInResult(GoogleSignInResult result) {
Log.d(TAG, "handleSignInResult:" + result.isSuccess());
if (result.isSuccess()) {
    // Signed in successfully, show authenticated UI.
    GoogleSignInAccount acct = result.getSignInAccount();


} else {
    // Signed out, show unauthenticated.

       }
}

//获得身份验证

AuthCredential credential =
GoogleAuthProvider.getCredential(acct.getIdToken(), null);
FirebaseAuth.getInstance().getCurrentUser().reauthenticate(credential)
.addOnCompleteListener(new OnCompleteListener<Void>() {
// add your job here on authenticated
} 
// if token is obsoleted then you can do this
credential.refreshToken();
accessToken = credential.getAccessToken();

如何使用Google提供程序在Firebase上重新验证用户？

3 个答案: