在Android上重新使用Google+的"一次性授权码"

Question

我正在根据以下内容通过Google+进行身份验证:https: //developers.google.com/+/mobile/android/sign-in

大多数这个过程似乎很好.我遇到的问题是我们需要获得"一次性授权代码",以便我们的后端服务器可以代表用户在他们的许可下执行某些请求."为您的应用启用服务器端api访问"一节中对此进行了介绍.但是,由于多种原因,即使授权代码有效,我们的服务器也可能导致登录失败(例如,用户在我们的服务器上没有与Google +帐户相对应的帐户,在这种情况下,他们可以制作一).

如果发生这种情况,我们可能需要他们稍后再次登录.但我发现,当我使用google +执行第二次登录时,它会给我相同的授权码,即使它已被我们的服务器使用过.我已经尝试断开连接并重新连接到谷歌客户端API,并打电话GoogleApiClient.clearDefaultAccountAndReconnect(),但无论我做什么,我似乎最终得到相同的授权码.当然,当服务器尝试使用它时,它会被拒绝,因为它已被使用.

我想知道我在这里做错了什么.我有以下方法,在初始身份验证过程中调用,然后再次500从我们的服务器检测到响应状态(表示先前的调用失败,可能是因为代码已被使用):

  private void dispatchGooglePlusAuthCodeAcquisition() {
    AsyncTask<Void, Void, String> authAcquisition = new AsyncTask<Void, Void, String>() {
      @Override
      protected String doInBackground(Void... params) {
        Bundle authPreferences = new Bundle();
        mUserPermissionNeededForAuthCode = false;
        authPreferences.putString(GoogleAuthUtil.KEY_REQUEST_VISIBLE_ACTIVITIES,
                                "");
        String scopesString = Scopes.PROFILE;
        WhenIWorkApplication app = (WhenIWorkApplication)WhenIWorkApplication.getInstance();
        String serverClientID = app.getGoogleOAuthClientIDForPersonalServer();
        String scope = "oauth2:server:client_id:" + serverClientID + ":api_scope:" + scopesString;
        String code = null;
        authPreferences.putBoolean(GoogleAuthUtil.KEY_SUPPRESS_PROGRESS_SCREEN, true);

        try {
          code = GoogleAuthUtil.getToken(
            mActivity,
            Plus.AccountApi.getAccountName(mGoogleApiClient),
            scope,
            authPreferences
          );
        } catch (IOException transientEx) {
          // network or server error, the call is expected to succeed if you try again later.
          // Don't attempt to call again immediately - the request is likely to
          // fail, you'll hit quotas or back-off.
          Log.d(LOGTAG, "Encountered an IOException while trying to login to Google+."
                                   + " We'll need to try again at a later time.");
        } catch (UserRecoverableAuthException e) {
          mUserPermissionNeededForAuthCode = true;
          // Requesting an authorization code will always throw
          // UserRecoverableAuthException on the first call to GoogleAuthUtil.getToken
          // because the user must consent to offline access to their data.  After
          // consent is granted control is returned to your activity in onActivityResult
          // and the second call to GoogleAuthUtil.getToken will succeed.
          if (!mGooglePlusPermissionActivityStarted) {
            mGooglePlusPermissionActivityStarted = true;
            mActivity.startActivityForResult(e.getIntent(), RESULT_CODE_AUTH_CODE);
          }
        } catch (GoogleAuthException authEx) {
          // Failure. The call is not expected to ever succeed so it should not be
          // retried.
          Log.e(LOGTAG, "Unable to authenticate to Google+. Call will likely never"
                                   + " succeed, so bailing.", authEx);
        }

        return code;
      }

      @Override
      protected void onPostExecute(String aResult) {
        if (aResult != null) {
          // We retrieved an authorization code successfully.
          if (mAPIAccessListener != null) {
            mAPIAccessListener.onAuthorizationCodeGranted(aResult);
          }
        } else if (!mUserPermissionNeededForAuthCode) {
          // If this is the case, then we didn't get authorization from the user, or something
          // else happened.
          if (mAPIAccessListener != null) {
            mAPIAccessListener.onAuthorizationFailed();
          }

          Log.d(LOGTAG, "Unable to login because authorization code retrieved was null");
        }
      }
    };

    authAcquisition.execute();

Answer 1

所以，这个问题的答案比我想象的要简单得多。显然，该类中有一个clearToken()方法GoogleAuthUtil：

http://developer.android.com/reference/com/google/android/gms/auth/GoogleAuthUtil.html#clearToken%28android.content.Context，%20java.lang.String%29

公共静态无效clearToken（上下文上下文，字符串标记）

清除本地缓存中与上下文相关的指定令牌。请注意，上下文必须与之前调用 getToken(Context, String, String) 或 getToken(Context, String, String, Bundle) 时用于初始化令牌的上下文相同。

参数

context 令牌的上下文。
token 要清除的令牌。

投掷

GooglePlayServicesAvailabilityException
GoogleAuthException
IOException

在尝试重新进行身份验证之前调用此方法会导致 Google 生成新的一次性授权令牌。