尝试使用Google Directory API和服务帐户身份验证时收到错误“未授权访问此资源/ api”

Question

I'm really struggling with trying to use Service Account authentication to use the Google Directory API (Admin SDK).

Using client based three legged OAuth this works (tested here - https://developers.google.com/admin-sdk/directory/v1/reference/members/insert ) but there's a problem with the permission delegation to the service account I am using. Under the Google Apps administration, I enabled using APIs and added the service account to the list of allowed OAuth clients as instructed.

Here is the code:

import httplib2
import sys

from apiclient.discovery import build
from oauth2client.client import SignedJwtAssertionCredentials

credentials = SignedJwtAssertionCredentials(
    '<KEY>@developer.gserviceaccount.com',
    '<KEY DATA>',
    scope='https://www.googleapis.com/auth/apps.groups.settings https://www.googleapis.com/auth/admin.directory.group https://www.googleapis.com/auth/admin.directory.group.member'
)
http = httplib2.Http()
http = credentials.authorize(http)

service = build("admin", "directory_v1", http=http)
groups = service.groups()
g = groups.get(groupKey="<GROUP NAME>").execute()

Eventually, I get the following error:

apiclient.errors.HttpError: <HttpError 403 when requesting https://www.googleapis.com/admin/directory/v1/groups/<GROUP NAME>?alt=json returned "Not Authorized to access this resource/api">

I tried using the following API as well:

service = build("groupssettings", "v1", http=http)

But this returns an error as well - "Backend Error".

Answer 1

Even though you're using a Service Account you still need to act on behalf of a Google Apps user in the instance that has the proper admin permissions. Try doing:

credentials = SignedJwtAssertionCredentials(
  '<KEY>@developer.gserviceaccount.com',
  '<KEY DATA>',
  scope='https://www.googleapis.com/auth/apps.groups.settings https://www.googleapis.com/auth/admin.directory.group https://www.googleapis.com/auth/admin.directory.group.member',
  sub='super-admin@yourdomain.com'
)

where super-admin@yourdomain.com is a super administrator in your Google Apps account.