相关疑难解决方法(0)

当我尝试使用服务帐户授权gmail api时,我收到以下错误

"客户端未经授权使用此方法检索访问令牌"

static async Task MainAsync()
    {

        sstageEntities db = new sstageEntities();
        //UserCredential credential;
        Dictionary<string, string> dictionary = new Dictionary<string, string>();    
String serviceAccountEmail =
"xxx.iam.gserviceaccount.com";

        var certificate = new X509Certificate2(
            AppDomain.CurrentDomain.BaseDirectory +
              "xxx-8c7a4169631a.p12",
            "notasecret",
            X509KeyStorageFlags.MachineKeySet | X509KeyStorageFlags.Exportable);

        //string userEmail = "user@domainhere.com.au";

        ServiceAccountCredential credential = new ServiceAccountCredential(
            new ServiceAccountCredential.Initializer(serviceAccountEmail)
            {
                User = "xxx@xxx.com",
                Scopes = new[] { "https://mail.google.com/" }
            }.FromCertificate(certificate)
        );


        // Create Gmail API service.
        var gmailService = new GmailService(new BaseClientService.Initializer()
        {
            HttpClientInitializer = credential,
            ApplicationName = ApplicationName,
        }); …

按照有关如何执行 G Suite 域范围授权的说明，请参见此处 https://developers.google.com/admin-sdk/directory/v1/guides/delegation 我完成了所有步骤，但现在我是坚持在我的应用程序中实现 SDK 目录服务对象，我在前端使用 Angular 7，后端使用 NodeJs（Firebase 云函数），但此处给出的代码仅支持 Java、Python 和 Go。谁能告诉我如何将其转换为 NodeJS？