.net - 我的个人硬盘中的 C# Google Drive API 文件列表

Question

我正在尝试连接到我自己的个人 Google 云端硬盘帐户并收集文件名列表。

我做了什么:

1. 安装了所需的所有 NuGet 包
2. 将 Google 云端硬盘添加到 Google Developers Console 中的 API 管理器
3. 设置Service Account并下载了用于身份验证的 P12 key

4. 编写以下代码来调用API:

   string EMAIL = "<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="14796d64667b7e7177607a7579715475646467647b603a73677166627d77717577777b617a603a777b79" rel="noreferrer noopener nofollow">[email protected]</a>";
   string[] SCOPES = { DriveService.Scope.Drive };
   StringBuilder sb = new StringBuilder();
   
   X509Certificate2 certificate = new X509Certificate2(@"c:\\DriveProject.p12",
                                  "notasecret", X509KeyStorageFlags.Exportable);
   ServiceAccountCredential credential = new ServiceAccountCredential(
      new ServiceAccountCredential.Initializer(EMAIL) { 
        Scopes = SCOPES 
      }.FromCertificate(certificate)
   );
   
   DriveService service = new DriveService(new BaseClientService.Initializer() { 
      HttpClientInitializer = credential
   });
   
   FilesResource.ListRequest listRequest = service.Files.List();
   IList<Google.Apis.Drive.v3.Data.File> files = listRequest.Execute().Files;
   if (files != null && files.Count > 0)
       foreach (var file in files)
           sb.AppendLine(file.Name);
   

这段代码看起来工作正常。问题是我只得到一个返回的文件，它的名字是“Getting started.pdf”，我不知道它到底来自哪里。我认为问题显然是我的个人 Google Drive 帐户没有连接到此代码。如何接到此电话以从我的个人 Google 云端硬盘帐户返回文件？

我能找到的唯一帮助是尝试让您在界面中访问任何最终用户 Google 云端硬盘帐户。我的情况与此不同。我只想在后台连接到我的 Google 云端硬盘帐户。

Answer 1

您正在连接的服务帐户未连接到您的个人 Google 云端硬盘帐户。将服务帐户视为自己的用户，它有自己的 Google 云端硬盘帐户。通过运行 files.list 显然现在上面没有任何文件。

解决方案 1:

将一些文件上传到服务帐户 Google 云端硬盘帐户

解决方案 2:

获取服务帐户电子邮件地址，并与服务帐户共享您的 Google 云端硬盘帐户上的文件夹，就像与任何其他用户一样。我不确定是否可以共享完整的驱动器帐户。如果您设法共享根文件夹，请告诉我:)

评论更新:打开谷歌驱动器网站。右键单击该文件夹，然后单击与他人共享。添加服务帐户电子邮件地址。繁荣它可以访问。

解决方案 3:

切换到 Oauth2 验证代码一次，只要使用该刷新 token 即可访问您的个人驱动器帐户，您就可以在任何时候运行应用程序时获得刷新 token 。

评论更新:您必须手动验证一次。之后，客户端库将为您加载刷新 token 。它存储在机器上。

Oauth2 Drive v3 示例代码:

/// <summary>
/// This method requests Authentcation from a user using Oauth2.  
/// Credentials are stored in System.Environment.SpecialFolder.Personal
/// Documentation https://developers.google.com/accounts/docs/OAuth2
/// </summary>
/// <param name="clientSecretJson">Path to the client secret json file from Google Developers console.</param>
/// <param name="userName">Identifying string for the user who is being authentcated.</param>
/// <returns>DriveService used to make requests against the Drive API</returns>
public static DriveService AuthenticateOauth(string clientSecretJson, string userName)
{
    try
    {
        if (string.IsNullOrEmpty(userName))
            throw new Exception("userName is required.");
        if (!File.Exists(clientSecretJson))
            throw new Exception("clientSecretJson file does not exist.");

        // These are the scopes of permissions you need. It is best to request only what you need and not all of them
        string[] scopes = new string[] { DriveService.Scope.Drive };                   // View and manage the files in your Google Drive         
        UserCredential credential;
        using (var stream = new FileStream(clientSecretJson, FileMode.Open, FileAccess.Read))
        {
            string credPath = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
            credPath = Path.Combine(credPath, ".credentials/apiName");

            // Requesting Authentication or loading previously stored authentication for userName
            credential = GoogleWebAuthorizationBroker.AuthorizeAsync(GoogleClientSecrets.Load(stream).Secrets,
                                                                     scopes,
                                                                     userName,
                                                                     CancellationToken.None,
                                                                     new FileDataStore(credPath, true)).Result;
        }

        // Create Drive API service.
        return new DriveService(new BaseClientService.Initializer()
        {
            HttpClientInitializer = credential,
            ApplicationName = "Drive Authentication Sample",
        });
    }
    catch (Exception ex)
    {
        Console.WriteLine("Create Oauth2 DriveService failed" + ex.Message);
        throw new Exception("CreateOauth2DriveFailed", ex);
    }
}