Question

在我的桌面应用程序中，我已成功获得OAuth2 access_token。

我可以通过添加到http请求标头来成功调用Google API：

Authorization: Bearer ya29.gQHsr_vr9P6nsEi06OKWkqKlvzD...

现在我想从http请求中获取当前用户 - 我该怎么做？我不想实施Google Cloud Endpoints。

@Override
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
{
    //  How do I get the logged in user ?
    com.google.appengine.api.users.User googleUser =  ?;
    return user;
}

Answer 1

如果我理解你的问题。

获取凭据后，您可以执行以下操作：

 /**
   * Send a request to the UserInfo API to retrieve the user's information.
   *
   * @param credentials OAuth 2.0 credentials to authorize the request.
   * @return User's information.
   * @throws NoUserIdException An error occurred.
   */
  static Userinfoplus getUserInfo(Credential credentials)
      throws NoUserIdException {
    Oauth2 userInfoService = new Oauth2.Builder(
        HTTP_TRANSPORT, JSON_FACTORY, credentials)
        .setApplicationName(APPLICATION_NAME)
        .build();
    Userinfoplus userInfo = null;
    try {
      userInfo = userInfoService.userinfo().get().execute();
    } catch (IOException e) {
      System.err.println("An error occurred: " + e);
    }
    if (userInfo != null && userInfo.getId() != null) {
      return userInfo;
    } else {
      throw new NoUserIdException();
    }

来源： https://developers.google.com/drive/web/credentials

如果有帮助，请告诉我。

Answer 2

我认为您需要的内容已经解释为here。来自＆＃34; OAuth服务提供商和App Engine的轻微修改的代码段＆＃34;该链接的一部分：

import com.google.appengine.api.users.User;
import com.google.appengine.api.oauth.OAuthRequestException;
import com.google.appengine.api.oauth.OAuthService;
import com.google.appengine.api.oauth.OAuthServiceFactory;
import com.google.appengine.api.oauth.OAuthServiceFailureException;

// ...
@Override
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
  // ...
  User user = null;
  try {
    OAuthService oauth = OAuthServiceFactory.getOAuthService();
    user = oauth.getCurrentUser();

  } catch (OAuthRequestException e) {
    // The consumer made an invalid OAuth request, used an access token that was
    // revoked, or did not provide OAuth information.
    // ...
  }

  // Rest of your handler code
}

适用于已安装应用程序的OAuth 2.0 - 如何调用我的AppEngine应用程序

2 个答案: