谷歌驱动器 - 无法下载缩略图的认证（OAuth2）要求 [英] Google Drive - Unable to download thumbnails with an authenticated (OAuth2) request

问题描述

对于所有谷歌文档，我不能够从一个文件响应返回ThumbnailLink属性下载缩略图。

For all Google Docs, I'm not able to download the thumbnail image from the ThumbnailLink property returned with a file response.

我总是收到一个403 - 禁止的错误页面，类似这样的消息：

I always receive a '403 - Forbidden' error page with a message similar to this:

您的客户无权获得网址/ thumbnailLink 从该服务器。

Your client does not have permission to get URL /thumbnailLink from this server.

（客户端IP地址： clientIP ）

Unuthorized用户

Unuthorized User

我尝试使用这个类的 MediaDownloader.cs 的由谷歌提供的，我也尝试使用这个code下载吧：

I try to use the class MediaDownloader.cs provided by Google and I also try to download it by using this code:

using (Stream stream = service.HttpClient.GetStreamAsync(p_DownloadUrl).Result) {
    StreamUtilities.Copy(p_WriteDelegate, stream.Read);
}

其中'服务'是一个DriveService（IClientService）对象的正确实例。我可以用它来下载文件，或进行任何其他请求。我用的是'Drive.Readonly范围。

where 'service' is a DriveService (IClientService) object properly instantiated. I can use it to download the file or make any other requests. I use the 'Drive.Readonly' scope.

我没有任何问题，下载缩略图了的Word，Excel，PDF等文档，因为这些链接是公开的，不需要任何种类的认证。

I didn't have any issue to download the Thumbnail for a Word, Excel, PDF, etc. documents, because these links are public and doesn't require any kind of authentication.

我不正确吗？

是否可以下载缩略图的谷歌文档文件？

Is it possible to download the thumbnail for a Google Docs document?

推荐答案

我们最近做了一个改变来解决这个问题。请再次尝试你的code，看看你仍然得到这个错误。我能够运行下面的code成功下载我的谷歌文档的缩略图。

We've recently made a change to fix this issue. Please try your code again and see if you are still getting this error. I was able to run the following code to successfully download a thumbnail of my Google Document.

# Get oauth credentials
...
# Authorize an http object
http = httplib2.Http()
http = credentials.authorize(http)

drive_service = build('drive', 'v2', http=http)

# Google Document type ID
docId = '1ns9x5BMIZAeUR-eXerqgpaHBBGkl_-_KCVpVoV5opn8'
files = drive_service.files().get(fileId=docId).execute()

thumbnailLink = files['thumbnailLink']
print 'Downloading thumbnail at: ', thumbnailLink
response, content = http.request(thumbnailLink)
print response.status

with open('thumbnail.jpg', 'wb') as f:
  f.write(content)

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