android - 错误 : OAuth2Credentials instance does not support refreshing the access token. 如何使用 token 值字符串创建 AccessToken 实例？

Question

我正在使用 Android 上的 Google Speech to Text 服务将语音流式传输到文本。 Here is official sample repository. 示例运行成功。但是或者，您应该在服务器端获取访问 token ，并将其提供给客户端应用。

所以我设置了一个服务器并为应用程序创建 RESTful api 以获取访问 token 。{"token":"1234567890sdertyuikjhgfghjk....."}

还可以使用 api: https://www.googleapis.com/oauth2/v1/tokeninfo?access_token= {token} 获取 token 信息:

{
 "issued_to": "102073270616313859663",
 "audience": "102073270616313859663",
 "scope": "https://www.googleapis.com/auth/cloud-platform",
 "expires_in": 3600,
 "access_type": "offline"
}

然后创建一个AccessToken实例:AccessToken token = new AccessToken(tokenValue, expiresIn);

但出现以下错误:

07-04 20:14:07.395 3023-3067/com.google.cloud.android.speech E/SpeechService: Error calling the API.
io.grpc.StatusRuntimeException: UNKNOWN
    at io.grpc.Status.asRuntimeException(Status.java:543)
    at io.grpc.stub.ClientCalls$StreamObserverToCallListenerAdapter.onClose(ClientCalls.java:395)
    at io.grpc.ClientInterceptors$CheckedForwardingClientCall.start(ClientInterceptors.java:202)
    at io.grpc.stub.ClientCalls.startCall(ClientCalls.java:276)
    at io.grpc.stub.ClientCalls.asyncStreamingRequestCall(ClientCalls.java:266)
    at io.grpc.stub.ClientCalls.asyncBidiStreamingCall(ClientCalls.java:106)
    at com.google.cloud.speech.v1.SpeechGrpc$SpeechStub.streamingRecognize(SpeechGrpc.java:217)
    at com.google.cloud.android.speech.SpeechService.startRecognizing(SpeechService.java:264)
    at com.google.cloud.android.speech.MainActivity$1.onVoiceStart(MainActivity.java:62)
    at com.google.cloud.android.speech.VoiceRecorder$ProcessVoice.run(VoiceRecorder.java:199)
    at java.lang.Thread.run(Thread.java:764)
 Caused by: java.lang.IllegalStateException: OAuth2Credentials instance does not support refreshing the access token. An instance with a new access token should be used, or a derived type that supports refreshing.
    at com.google.auth.oauth2.OAuth2Credentials.refreshAccessToken(OAuth2Credentials.java:208)
    at com.google.auth.oauth2.OAuth2Credentials.refresh(OAuth2Credentials.java:175)
    at com.google.auth.oauth2.OAuth2Credentials.getRequestMetadata(OAuth2Credentials.java:161)
    at com.google.cloud.android.speech.SpeechService$GoogleCredentialsInterceptor.getRequestMetadata(SpeechService.java:532)
    at com.google.cloud.android.speech.SpeechService$GoogleCredentialsInterceptor.access$900(SpeechService.java:450)
    at com.google.cloud.android.speech.SpeechService$GoogleCredentialsInterceptor$1.checkedStart(SpeechService.java:474)
    at io.grpc.ClientInterceptors$CheckedForwardingClientCall.start(ClientInterceptors.java:194)
    at io.grpc.stub.ClientCalls.startCall(ClientCalls.java:276) 
    at io.grpc.stub.ClientCalls.asyncStreamingRequestCall(ClientCalls.java:266) 
    at io.grpc.stub.ClientCalls.asyncBidiStreamingCall(ClientCalls.java:106) 
    at com.google.cloud.speech.v1.SpeechGrpc$SpeechStub.streamingRecognize(SpeechGrpc.java:217) 
    at com.google.cloud.android.speech.SpeechService.startRecognizing(SpeechService.java:264) 
    at com.google.cloud.android.speech.MainActivity$1.onVoiceStart(MainActivity.java:62) 
    at com.google.cloud.android.speech.VoiceRecorder$ProcessVoice.run(VoiceRecorder.java:199) 
    at java.lang.Thread.run(Thread.java:764) 

我可以使用示例代码:

 final InputStream stream = getResources().openRawResource(R.raw.credential);
 final GoogleCredentials credentials = 
 GoogleCredentials.fromStream(stream).createScoped(SCOPE);
 final AccessToken token = credentials.refreshAccessToken();

并得到一个working Token，通过getTokenValue()得到它的token值，通过getExpirationTime得到它的过期时间。然后创建一个 Token 实例:AccessToken token = new AccessToken(tokenValue, expiresIn);返回一个 AccessToken 实例。但它会导致同样的错误。

所以我的问题是，当我获得 token 值字符串和到期时间时，如何创建一个工作 AccessToken 实例。

Answer 1

不幸的是，我仍然无法通过构造函数创建有效的AccessToken。但是我使用套接字服务器来解决问题。因为AccessToken已经实现了Serializable接口(interface)。因此在客户端和服务器之间进行通信要容易得多。

服务器

private void  runServer() throws IOException, ClassNotFoundException{
    ServerSocket ss = new ServerSocket(port);

    Socket socket = ss.accept();
    ObjectOutputStream os = new ObjectOutputStream(socket.getOutputStream());
    ObjectInputStream is = new ObjectInputStream(socket.getInputStream());

    final InputStream stream = new ByteArrayInputStream(credential.getBytes(StandardCharsets.UTF_8));
    final GoogleCredentials credentials = GoogleCredentials.fromStream(stream)
                    .createScoped(SCOPE);
    final AccessToken token = credentials.refreshAccessToken();
    os.writeObject(token);
}