C＃Google云端硬盘APIv3上传文件

Question

我正在制作一个简单的应用程序，该应用程序链接到Google云端硬盘帐户，然后可以将文件上传到任何目录并使用（直接）下载链接进行响应。我已经有了User Credentials和DriveService对象，但是似乎找不到任何好的示例或文档。在APIv3上。

由于我不太熟悉OAuth，我想就如何立即上传包含byte[]内容的文件提供一个清晰明确的解释。

我的将应用程序链接到Google云端硬盘帐户的代码：（不确定是否可以正常运行）

    UserCredential credential;


        string dir = Directory.GetCurrentDirectory();
        string path = Path.Combine(dir, "credentials.json");

        File.WriteAllBytes(path, Properties.Resources.GDJSON);

        using(var stream = new FileStream(path, FileMode.Open, FileAccess.Read)) {
            string credPath = Path.Combine(dir, "privatecredentials.json");

            credential = GoogleWebAuthorizationBroker.AuthorizeAsync(
                GoogleClientSecrets.Load(stream).Secrets,
                Scopes,
                "user",
                CancellationToken.None,
                new FileDataStore(credPath, true)).Result;
        }

        // Create Drive API service.
        _service = new DriveService(new BaseClientService.Initializer() {
            HttpClientInitializer = credential,
            ApplicationName = ApplicationName,
        });

        File.Delete(path);

到目前为止，我的上传代码：（显然无法正常工作）

        public void Upload(string name, byte[] content) {

        Google.Apis.Drive.v3.Data.File body = new Google.Apis.Drive.v3.Data.File();
        body.Name = name;
        body.Description = "My description";
        body.MimeType = GetMimeType(name);
        body.Parents = new List() { new ParentReference() { Id = _parent } };


        System.IO.MemoryStream stream = new System.IO.MemoryStream(content);
        try {
            FilesResource.InsertMediaUpload request = _service.Files.Insert(body, stream, GetMimeType(_uploadFile));
            request.Upload();
            return request.ResponseBody;
        } catch(Exception) { }
    }

谢谢！

Answer 1

启用Drive API，注册项目并从Developer Consol获得凭据后，就可以使用以下代码获得用户的同意并获得经过身份验证的Drive Service

string[] scopes = new string[] { DriveService.Scope.Drive,
                             DriveService.Scope.DriveFile};
var clientId = "xxxxxx";      // From https://console.developers.google.com
var clientSecret = "xxxxxxx";          // From https://console.developers.google.com
// here is where we Request the user to give us access, or use the Refresh Token that was previously stored in %AppData%
var credential = GoogleWebAuthorizationBroker.AuthorizeAsync(new ClientSecrets { ClientId = clientId,
                                                                              ClientSecret = clientSecret},
                                                        scopes,
                                                        Environment.UserName,
                                                        CancellationToken.None,
                                                        new FileDataStore("MyAppsToken")).Result; 
//Once consent is recieved, your token will be stored locally on the AppData directory, so that next time you wont be prompted for consent. 

DriveService service = new DriveService(new BaseClientService.Initializer()
{
   HttpClientInitializer = credential,
   ApplicationName = "MyAppName",
});
service.HttpClient.Timeout = TimeSpan.FromMinutes(100); 
//Long Operations like file uploads might timeout. 100 is just precautionary value, can be set to any reasonable value depending on what you use your service for.

以下是用于上传到云端硬盘的代码段。

    // _service: Valid, authenticated Drive service
    // _uploadFile: Full path to the file to upload
    // _parent: ID of the parent directory to which the file should be uploaded

public static Google.Apis.Drive.v2.Data.File uploadFile(DriveService _service, string _uploadFile, string _parent, string _descrp = "Uploaded with .NET!")
{
   if (System.IO.File.Exists(_uploadFile))
   {
       File body = new File();
       body.Title = System.IO.Path.GetFileName(_uploadFile);
       body.Description = _descrp;
       body.MimeType = GetMimeType(_uploadFile);
       body.Parents = new List<ParentReference>() { new ParentReference() { Id = _parent } };

       byte[] byteArray = System.IO.File.ReadAllBytes(_uploadFile);
       System.IO.MemoryStream stream = new System.IO.MemoryStream(byteArray);
       try
       {
           FilesResource.InsertMediaUpload request = _service.Files.Insert(body, stream, GetMimeType(_uploadFile));
           request.Upload();
           return request.ResponseBody;
       }
       catch(Exception e)
       {
           MessageBox.Show(e.Message,"Error Occured");
       }
   }
   else
   {
       MessageBox.Show("The file does not exist.","404");
   }
}

这是确定MimeType的小功能：

private static string GetMimeType(string fileName)
{
    string mimeType = "application/unknown";
    string ext = System.IO.Path.GetExtension(fileName).ToLower();
    Microsoft.Win32.RegistryKey regKey = Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(ext);
    if (regKey != null && regKey.GetValue("Content Type") != null)
        mimeType = regKey.GetValue("Content Type").ToString();
    return mimeType;
}

此外，您可以注册ProgressChanged活动并获取上传状态。

 request.ProgressChanged += UploadProgessEvent;
 request.ChunkSize = FilesResource.InsertMediaUpload.MinimumChunkSize; // Minimum ChunkSize allowed by Google is 256*1024 bytes. ie 256KB. 

和

 private void UploadProgessEvent(Google.Apis.Upload.IUploadProgress obj)
 {
     label1.Text = ((obj.ByteSent*100)/TotalSize).ToString() + "%";

    // do updation stuff
 }

上传就差不多了。

来源。