Google api 如何控制google API访问的令牌响应到期时间

我无法将google访问令牌的有效性标准延长一小时。 我的代码的一部分是从用户那里获得授权，按照谷歌的建议使用GoogleAuthorizationCodeFlow。这可以很好地工作，并为我提供了一个令牌响应，我可以在应用程序的其他部分（用户未连接的部分）中使用它

根据Google文档，我认为流中的脱机访问类型将使TokenResponse能够在用户不撤销它的情况下使用更长的时间。但是很明显，当我在用户授权后使用这个tokenresponse时，它可以正常工作，但是当我在一个多小时后使用它时，我会收到一个无效的凭证，该凭证由谷歌发回

以下是在用户授权后创建TokenResponse的代码：

private HttpTransport HTTP_TRANSPORT;
private JacksonFactory JSON_FACTORY = JacksonFactory.getDefaultInstance();

private static GoogleAuthorizationCodeFlow flow;

@PostConstruct
public void init() {
    try {

        HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();
    } catch (GeneralSecurityException | IOException e) {
        logger.info(String.format("Raised Exception while getting GoogleNetHttpTransport : %s", e.getMessage()));
        e.printStackTrace();
    }
    flow = new GoogleAuthorizationCodeFlow.Builder(HTTP_TRANSPORT, JSON_FACTORY, APP_ID, APP_SECRET,
            Collections.singleton(CalendarScopes.CALENDAR_READONLY)).setAccessType("offline").build();
}
@RequestMapping(value = Uris.GOOGLERD)
public ModelAndView googleCallBack(HttpServletRequest request, @RequestParam(value = "state", required = false) String state,
        @RequestParam(value = "code", required = false) String code,
        @RequestParam(value = "error", required = false) String error, Model model) {
    DynSubscriber dynSubscriber = (DynSubscriber) request.getSession().getAttribute("dynSubscriber");
    ModelAndView toReturn = new ModelAndView("confirmation");
    toReturn.addObject("buttonLabel", "Accueil");

    try {

        AuthorizationCodeTokenRequest tokenRequest = flow.newTokenRequest(code);
        TokenResponse tr = tokenRequest.setRedirectUri(request.getRequestURL().toString()).execute();


        // Json Conversion of Token Response for future use
        StringWriter jsonTrWriter = new StringWriter();
        JsonGenerator generator = JSON_FACTORY.createJsonGenerator(jsonTrWriter);
        generator.serialize(tr);
        generator.flush();
        generator.close();


        //Persists google access info 
        dynSubOp.setSPConnexionInfo(dynSubscriber, jsonTrWriter.toString(), DynServiceProviderType.GOOGLECAL);
        toReturn.addObject("message","Agenda Google autorisé");

    } catch (IOException | DynServicesException e) {
        logger.error(String.format("Exception raised in googleCallBack for subscriber %s : %s", dynSubscriber.buildFullName(), e.getMessage()),e);
        toReturn.addObject("message", "Problème lors du processus d'autorisation google");
    }

    return toReturn;
}
}

下面是使用此TokenResponse的脱机代码：

private com.google.api.services.calendar.Calendar calendarConnection;


public DynGoogleCalendarRetriever(String subid, String connectionInformation)
        throws CalendarConnectionNotAuthorizedException {


    TokenResponse tr;
    try {
        HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();
        tr = JSON_FACTORY.fromString(connectionInformation, TokenResponse.class);

        Credential c = new GoogleCredential().setFromTokenResponse(tr);
        calendarConnection = new com.google.api.services.calendar.Calendar.Builder(HTTP_TRANSPORT, JSON_FACTORY, c)
                .build();
    } catch (IOException | GeneralSecurityException e) {
        logger.error(String.format("Failure creating the credentials for subscriber id %s", subid), e);
        throw new CalendarConnectionNotAuthorizedException(String.format(
                "Failure creating the credentials for subscriber id %s", subid), e);
    }


}

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看来这个问题已经得到了答复。 要获取启用所需内容的刷新令牌，我需要使用approval\u prompt=force参数builder.setApprovalPromptforce构建流

根据注释，这需要在流初始化中完成脱机访问

不过，这是一个补充：尽管我从谷歌文档中复制并粘贴了离线代码（可能是旧版本），但我的问题中的离线代码并不能正常工作。凭证需要使用其生成器对象

以下是功能齐全的脱机代码：

    TokenResponse tr;
    try {
        HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();
        tr = JSON_FACTORY.fromString(connectionInformation, TokenResponse.class);

        Credential c = new GoogleCredential.Builder().setTransport(HTTP_TRANSPORT).setJsonFactory(JSON_FACTORY)
                .setClientSecrets(APP_ID, APP_SECRET).build().setFromTokenResponse(tr);

        calendarConnection = new com.google.api.services.calendar.Calendar.Builder(HTTP_TRANSPORT, JSON_FACTORY, c)
                .build();
    } catch (IOException | GeneralSecurityException e) {
        logger.error(String.format("Failure creating the credentials for subscriber id %s", subid), e);
        throw new CalendarConnectionNotAuthorizedException(String.format(
                "Failure creating the credentials for subscriber id %s", subid), e);
    }

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那不正确。您可能需要出于其他原因强制批准，但这并不影响您是否赢得刷新令牌。要获取刷新令牌，您需要请求脱机访问。