NodeJS谷歌云服务账户承载令牌

我正在尝试获取谷歌服务帐户的授权承载令牌,以便进行REST API调用。我得到的服务帐户JSON密钥如下所示:

{ 
    "type": "service_account",
    "project_id": "sa-12345",
    "private_key_id": "12345abc",
    "private_key": "-----BEGIN PRIVATE KEY-----\n12345abc\n12345abc\n=\n-----END PRIVATE KEY-----\n",
    "client_email": "sa@sa12345-12345.iam.gserviceaccount.com",
    "client_id": "12345",
    "auth_uri": "https://accounts.google.com/o/oauth2/auth",
    "token_uri": "https://oauth2.googleapis.com/token",
    "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
    "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/sa%40sa-12345.iam.gserviceaccount.com"
  }

在NodeJs中有什么方法可以实现这一点吗?我不能使用谷歌SDK,因为我只接收URL作为输入,仅基于该信息使用SDK需要从URL映射到SDK库(计算、存储等)