Google登录Android版：将Web客户端ID传递给requestIdToken时出现12500错误

Question

我正在尝试使用网站的API对移动应用程序上的用户进行身份验证。我在我的应用程序上成功登录了Google，因此我尝试通过服务器端进行身份验证。但是，当我将客户端ID传递给requestIdToken时，会出现12500 ApiException错误。

这是我的代码。

    GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
            .requestEmail()
            .requestServerAuthCode(getString(R.string.server_client_id))
            .build();

    mGoogleSignInClient = GoogleSignIn.getClient(this, gso);

    mSignInButton = findViewById(R.id.sign_in_button);
    mSignInButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            signIn();
        }
    });

    mSignOutButton = findViewById(R.id.sign_out_button);
    mSignOutButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            signOut();
        }
    });

@Override
protected void onStart() {
    // Check for existing Google Sign In account, if the user is already signed in
    // the GoogleSignInAccount will be non-null.
    GoogleSignInAccount account = GoogleSignIn.getLastSignedInAccount(this);
    updateUI(account);
    super.onStart();
}


@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);



    // Result returned from launching the Intent from GoogleSignInClient.getSignInIntent(...);
    if (requestCode == RC_SIGN_IN) {
        // The Task returned from this call is always completed, no need to attach
        // a listener.
        Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
        handleSignInResult(task);
    }
}


private void signIn() {

    Intent intent = mGoogleSignInClient.getSignInIntent();
    startActivityForResult(intent, RC_SIGN_IN);
}


private void signOut() {
    mGoogleSignInClient.signOut()
            .addOnCompleteListener(this, new OnCompleteListener<Void>() {
                @Override
                public void onComplete(@NonNull Task<Void> task) {
                    updateUI(null);
                }
            });
}


private void handleSignInResult(Task<GoogleSignInAccount> completedTask) {
    try {
        GoogleSignInAccount account = completedTask.getResult(ApiException.class);

        // Send the token to the API endpoint and validate
        mAuthToken = account.getIdToken();
        mAuthCode = account.getServerAuthCode();


        login();

        // Signed in successfully, show authenticated UI.
        updateUI(account);
    } catch (ApiException e) {
        // The ApiException status code indicates the detailed failure reason.
        // Please refer to the GoogleSignInStatusCodes class reference for more information.
        Log.w(TAG, "handleSignInResult:error=" +  e.getStatusCode()); // 12500 
        updateUI(null);
    }
}


private void updateUI(GoogleSignInAccount signInAccount) {
    if (signInAccount != null) {
        mSignInButton.setVisibility(View.GONE);
        mSignOutButton.setVisibility(View.VISIBLE);
    } else {
        mSignInButton.setVisibility(View.VISIBLE);
        mSignOutButton.setVisibility(View.GONE);
    }
}

我确定我使用的是正确的Web客户端ID。可能是什么原因？