Youtube Analytics& Google服务帐户

目标：
实施程序（java或python）以从我在Youtube频道上发布的视频中检索数据。
此计划将每天（凌晨1:00）推出。

Objectives: Implement a program (java or python) to retrieve data from videos that I published on my Youtube channel. This program will be launched daily (1:00 AM).

解决方案：
要检索数据Youtube，包括每天的观看次数，YouTube Analytics API在我看来是最好的解决方案。我使用Google帐户服务（GoogleCredential）对我进行身份验证：

Solutions: To retrieve data Youtube, including the number of views per day, YouTube Analytics API is in my opinion the best solution. I use the Google Account Service ("GoogleCredential") to authenticate me:

static {
    // Build service account credential.
    try {

        // Create a listener for automatic refresh OAuthAccessToken
        List<CredentialRefreshListener> list = new ArrayList<CredentialRefreshListener>();
        list.add(new CredentialRefreshListener() {

            public void onTokenResponse(Credential credential,
                    TokenResponse tokenResponse) throws IOException {
                System.out.println(tokenResponse.toPrettyString());

            }

            public void onTokenErrorResponse(Credential credential,
                    TokenErrorResponse tokenErrorResponse)
                    throws IOException {
                System.err.println("Error: "
                        + tokenErrorResponse.toPrettyString());
            }
        });

        // Create a GoogleCredential for authenticate with ServiceAccount
        // service
        credential = new GoogleCredential.Builder()
                .setTransport(HTTP_TRANSPORT)
                .setJsonFactory(JSON_FACTORY)
                .setServiceAccountId(SERVICE_ACCOUNT_EMAIL)
                .setServiceAccountScopes(SCOPES)
                .setClock(Clock.SYSTEM)
                .setServiceAccountPrivateKeyFromP12File(
                        new File("key.p12"))
                .setRefreshListeners(list).build();

        credential.refreshToken();

    } catch (GeneralSecurityException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

我执行Youtube Analytics查询：

And I execute Youtube Analytics query:

YoutubeAnalytics youtubeAnalytics = new YoutubeAnalytics.Builder(HTTP_TRANSPORT, JSON_FACTORY, credential)
        .setApplicationName("Test-YouTube-Analytics/1.0").build();

    // Create request
    credential.refreshToken();
    YoutubeAnalyticsRequest<?> request = youtubeAnalytics.reports()
            .query("channel==" + channelId, "2012-10-01", "2012-12-01", "views")
            .setAlt("json")
            .setKey(API_KEY)
            .setDimensions("month")
            .setPrettyPrint(true);
    System.out.println(request.buildHttpRequest().getUrl().toString());
    ResultTable first = (ResultTable) request.execute();
}

但我收到以下错误：

com.google.api.client.googleapis.json.GoogleJsonResponseException: 500 Internal Server Error
{
  "code" : 500,
  "errors" : [ {
    "domain" : "global",
    "message" : "Unknown error occurred on the server.",
    "reason" : "internalError"
  } ],
  "message" : "Unknown error occurred on the server."
}

感谢您的见解！