Objetivos. Implemente um programa (java ou python) para recuperar dados de vídeos que publiquei no meu canal do Youtube. Este programa será lançado diariamente (01:00).

Soluções: Para recuperar dados do YouTube, incluindo o número de visualizações por dia, a API do YouTube Analytics é, na minha opinião, a melhor solução. Eu uso o Serviço da Conta do Google ("GoogleCredential") para me autenticar:

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();
    }
}

E eu executo a consulta do YouTube Analytics:

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();
}

Mas recebo o seguinte erro:

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."
}

Obrigado pela sua visão!