Google Contacts API - 无法刷新访问令牌

Question

我们将 Google Contacts API 与 OAuth2 结合使用：

credential = new GoogleCredential.Builder().setTransport(new NetHttpTransport())
        .setJsonFactory(new JacksonFactory())
        .setClientSecrets(OAuth2ClientId(), OAuth2ClientSecret())
        .addRefreshListener(new CredentialRefreshListener() {...});

myService = new ContactsService("My-App");
myService.setOAuth2Credentials(credential);

我们经常收到 GData 库无法处理的“401 Unauthorized”响应。 当WWW-Authenticate 标头丢失时，AuthenticationException 会抛出 NPE。

Caused by: java.lang.NullPointerException: No authentication header information
        at com.google.gdata.util.AuthenticationException.initFromAuthHeader(AuthenticationException.java:96) ~[gdata-core-1.0-1.47.1.jar:na]
        at com.google.gdata.util.AuthenticationException.<init>(AuthenticationException.java:67) ~[gdata-core-1.0-1.47.1.jar:na]
        at com.google.gdata.client.http.HttpGDataRequest.handleErrorResponse(HttpGDataRequest.java:608) ~[gdata-core-1.0-1.47.1.jar:na]
        at com.google.gdata.client.http.GoogleGDataRequest.handleErrorResponse(GoogleGDataRequest.java:564) ~[gdata-core-1.0-1.47.1.jar:na]
        at com.google.gdata.client.http.HttpGDataRequest.checkResponse(HttpGDataRequest.java:560) ~[gdata-core-1.0-1.47.1.jar:na]
        at com.google.gdata.client.http.HttpGDataRequest.execute(HttpGDataRequest.java:538) ~[gdata-core-1.0-1.47.1.jar:na]
        at com.google.gdata.client.http.GoogleGDataRequest.execute(GoogleGDataRequest.java:536) ~[gdata-core-1.0-1.47.1.jar:na]
        at com.google.gdata.client.Service.getFeed(Service.java:1135) ~[gdata-core-1.0-1.47.1.jar:1.47.1]
        at com.google.gdata.client.Service.getFeed(Service.java:1077) ~[gdata-core-1.0-1.47.1.jar:1.47.1]
        at com.google.gdata.client.GoogleService.getFeed(GoogleService.java:676) ~[gdata-core-1.0-1.47.1.jar:1.47.1]
        at com.google.gdata.client.Service.query(Service.java:1237) ~[gdata-core-1.0-1.47.1.jar:1.47.1]
        at com.google.gdata.client.Service.query(Service.java:1178) ~[gdata-core-1.0-1.47.1.jar:1.47.1]

我们设法添加了一个包装器，可以尝试在此 NPE 上刷新令牌。它有帮助，但是刷新失败的情况仍然很多：

credential.refreshToken() == false

当我们在调试器中运行refreshToken() 时，我们看到executeRefreshToken() 没有异常地执行，但返回了tokenResponse==null。结果refreshToken() 返回false 并且没有向侦听器传递任何原因

try {
    TokenResponse tokenResponse = executeRefreshToken();
    if (tokenResponse != null) {
      setFromTokenResponse(tokenResponse);
      for (CredentialRefreshListener refreshListener : refreshListeners) {
        refreshListener.onTokenResponse(this, tokenResponse);
      }
      return true;
    }
  } catch (TokenResponseException e) {
    boolean statusCode4xx = 400 <= e.getStatusCode() && e.getStatusCode() < 500;
    // check if it is a normal error response
    if (e.getDetails() != null && statusCode4xx) {
      // We were unable to get a new access token (e.g. it may have been revoked), we must now
      // indicate that our current token is invalid.
      setAccessToken(null);
      setExpiresInSeconds(null);
    }
    for (CredentialRefreshListener refreshListener : refreshListeners) {
      refreshListener.onTokenErrorResponse(this, e.getDetails());
    }
    if (statusCode4xx) {
      throw e;
    }
  }
  return false;

我们的令牌始终适用于多个范围：https://www.googleapis.com/auth/userinfo.email https://www.google.com/m8/feeds https://www.googleapis.com/auth/calendar https://mail.google.com/ https://www.googleapis.com/auth/tasks

更新：我们已成功迁移到 People API，新的 API 也被我们的统一 API 联系人 API https://docs.aurinko.io/article/25-contacts-api使用。

Answer 1

Contacts API 目前存在一个错误，其中某些 HTTP User-Agent 字符串会导致 401 响应以 HTML 页面而不是 XML 响应的形式返回，并且缺少 AuthenticationException 类所在的 WWW-Authenticate 标头依靠。 GContacts-Java 是这些特殊的用户代理字符串之一。一种解决方法是在创建客户端后更改其用户代理：

ContactsService service = new ContactsService(applicationName);
service.getRequestFactory().setHeader("User-Agent", applicationName);

这应该消除 NPE，并允许客户端库自动检测过期令牌并自动刷新它们。