C# 将显式流上载文件到google drive

我有一个Angular 6应用程序，它使用.NETCore2.x作为后端

我让外部提供者为显式流工作（很多示例） 我使用显式流，因为我不想与web应用共享机密和客户端id

我有一个上传文件服务（domain.com/api/upload） 女巫很管用

现在，我想将文件保存到登录用户的google驱动器。 google项目拥有google drive api权限和所有

但我无法让驱动器api客户端使用驱动器api进行身份验证

控制器动作

private async Task<IFileStoreItem> SaveFile(IFormFile file, IFilePath path)
{
    if (file == null) throw new Exception("File is null");
    if (file.Length == 0) throw new Exception("File is empty");
    if(path == null) throw new Exception("path is null");

    IFileStoreItem item = file.Adapt<DocumentInfo>();
    item.Container = path.Container;
    item.Partition = path.Partition;

    IFileStoreService fileStoreService = GetFileStoreService();

    if (file.Length > 0)
    {
        using (Stream stream = new MemoryStream())
        {
            await file.CopyToAsync(stream);
            item = await fileStoreService.Save(stream, item);
        }
        item.Link =  Url.AbsoluteUri("DownloadFile", "File", new { container = item.Container, partition = item.Partition, id = item.Id });
    }

    return item;
}

private IFileStoreService GetFileStoreService()
{
    IFileStoreService ret = null;
    string uploads = Path.Combine(_environment.WebRootPath, "uploads");
    DocumentStorageConfiguration config = new StorageConfiguration().GetStoragetSettings();

            ret = new GoogleDriveService(User.Claims.Where(c => c.Type == JwtRegisteredClaimNames.UniqueName).SingleOrDefault()?.Value);
    return ret;
}

驾驶服务

public class GoogleDriveService : IFileStoreService
{
    DriveService _service;
    UserCredential credential;

    public GoogleDriveService(string user)
    {
        string[] scopes = new string[] {
                         DriveService.Scope.Drive,
                         DriveService.Scope.DriveFile};

        GoogleConfiguration config = new AuthentificationConfiguration().GetGoogleSettings();
        var secrets = new ClientSecrets
        {
            ClientId = config.ClientId,
            ClientSecret = config.ClientSecret
        };            


        credential =  GoogleWebAuthorizationBroker.AuthorizeAsync(secrets, scopes, user, CancellationToken.None).Result;
        _service = new DriveService(new Google.Apis.Services.BaseClientService.Initializer() {
            HttpClientInitializer = credential
        });
    }





    public async Task<IFileStoreItem> Save(System.IO.Stream stream, IFileStoreItem item)
    {
        File body = new File
        {
            Name = item.Name,
            MimeType = item.ContentType,
            Parents = new List<string>() { "Documents" }
        };


        FilesResource.CreateMediaUpload request = new FilesResource.CreateMediaUpload(_service,body,stream,item.ContentType);
        IUploadProgress progress = await request.UploadAsync();
        item.Id = body.Id;

        return item;
    }
}

公共类GoogleDriveService:IFileStoreService
{
驾驶服务(DriveService);；
用户凭证；
公共GoogleDriveService（字符串用户）
{
字符串[]范围=新字符串[]{
DriveService.Scope.Drive，
DriveService.Scope.DriveFile}；
GoogleConfiguration配置=新建AuthentificationConfiguration（）.GetGoogleSettings（）；
var secrets=newclientsecrets
{
ClientId=config.ClientId，
ClientSecret=config.ClientSecret
};            
credential=GoogleWebAuthorizationBroker.AuthorizationAsync（机密、作用域、用户、CancellationToken.None）。结果；
_service=newdriveservice（新的Google.api.Services.BaseClientService.Initializer（）{
HttpClientInitializer=凭证
});
}
公共异步任务保存（System.IO.Stream，IFileStoreItem）
{
文件体=新文件
{
名称=项。名称，
MimeType=item.ContentType，
Parents=新列表（）{“文档”}
};
FileResource.CreateMediaUpload请求=新建FileResource.CreateMediaUpload（_服务、正文、流、项.ContentType）；
IUploadProgress progress=wait request.UploadAsync（）；
item.Id=body.Id；
退货项目；
}
}

我得到的错误是坏网关502

问题是我是否可以根据当前登录的用户（witch已经是google用户）使用google drive进行身份验证