CODEWITHSUNDEEP
google-drive-apigoogle-oauth
IrishDubGuy
IrishDubGuy

Reputation: 1103

Oauth2 Google Drive offline access not working for non-google app files?

Having a very frustrating issue with Google Drive API.

This is a Google App Engine Java environment.

I need to download a file based on an offline permission - the file is shared ("Can Edit") with the user who gives the offline permission. I am requesting full https://www.googleapis.com/auth/drive scope. I store off the refresh token this generates.

The app then uses this refresh token to get an access token, which it uses to try and download a file. This works file if the file is a Google Apps file (a Google document, spreadsheet etc.) but gives a 401 if the file is an uploaded file with content (e.g. a PDF file, Word file etc.). I can confirm this at a simple level by appending the share urls with ?access_token=xxxx - this works for the Google Apps file but not for an uploaded normal file, which 401's on the webcontentlink url. Note that the https://www.googleapis.com/drive/v2/files/ endpoint responds correctly with the metadata for the uploaded file using the access token that subsequently fails on the download call.

The full html response from either a direct url call (with access_token=) or a servlet call is

<HTML>
<HEAD>
<TITLE>Unauthorized</TITLE>
</HEAD>
<BODY BGCOLOR="#FFFFFF" TEXT="#000000">
<H1>Unauthorized</H1>
<H2>Error 401</H2>
</BODY>
</HTML>

Is there a known issue with offline Google auth on non native files in Drive?

Upvotes: 1

Views: 626

Answers (1)

Jay Lee
Jay Lee

Reputation: 13528

Based on the descriptions of file attributes, you should probably be using the downloadUrl attribute rather than webContentLink.

downloadUrl - Short lived download URL for the file. This is only populated for files with content stored in Drive.

webContentLink - A link for downloading the content of the file in a browser using cookie based authentication. In cases where the content is shared publicly, the content can be downloaded without any credentials.

Upvotes: 2

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