AccessTokenRefreshError：带有App Engine App的oAuth 2.0服务帐户的Google Spreadsheet API

Question

我正在尝试使用为在Google App Engine上托管的Python 2.7应用程序创建的oAuth 2.0服务帐户凭据通过GData API访问Google Spreadsheet。

1. 该应用程序使用了Google最近发布的gdata-python-client 2.0.18版（gdata和atom）。
2. 该应用使用了最新的google-api-python-client-gae 1.2版。
3. 在此项目的Google Developer Console中（在本示例中称为“ my-gae-app”），我已经创建了一个服务帐户，并将域范围内的权限委派给了该服务帐户， 如下所述
4. Google云端硬盘中所需的电子表格属于Google Apps for Work域，此处称为“ mygoogleappsdomain.com”。
5. 我已将电子表格的读写访问权限授予[email protected]以及为此服务帐户显示的电子邮件地址，并在下面的代码clientEmail其分配给clientEmail变量。 不确定实际上需要两个电子邮件地址中的哪个，因此我分配了两个地址。 具有impersonateUser电子邮件地址的用户也对此电子表格具有读写访问权限。

使用Google API Python客户端的AppAssertionCredentials我可以通过Google Drive API访问所需电子表格的元数据。 但是，如果尝试使用gdata访问电子表格的内容，则会出错。 到目前为止，我可以使用服务帐户获得的最佳结果是使用SignedJwtAssertionCredentials ， 如此处建议的那样 。 但是，我坚持使用此AccessRefreshTokenError: access denied并且我不知AccessRefreshTokenError: access denied什么问题。

import os
import httplib2
from google.appengine.api import memcache
from apiclient.discovery import build
from oauth2client.client import SignedJwtAssertionCredentials
import gdata.spreadsheets.client
import gdata.spreadsheet.service

# AppAssertionCredentials is not supported in gdata python client library,
# so we use SignedJwtAssertionCredentials with the credential 
# file of this service account.
# Load the key in PKCS 12 format that you downloaded from the Google API
# Console when you created your Service account.
clientEmail = '[e-mail]'
p12File = 'app.p12'
path = os.path.join(ROOT_DIR, 'data', 'oAuth2', p12File)
impersonateUser = '[email protected]'
spreadsheetKey = '1mcJHJ...................................juQMw' # ID copied from URL of desired spreadsheet in Google Drive
with open(path) as f:
    privateKey = f.read()
    f.close()

# Getting credentials with AppAssertionCredentials only worked successfully
# for Google API Client Library for Python, e.g. accessing file's meta-data.
# So we use SignedJwtAssertionCredentials, as suggested in
# https://stackoverflow.com/questions/16026286/using-oauth2-with-service-account-on-gdata-in-python
credentials = SignedJwtAssertionCredentials(
    clientEmail,
    privateKey,
    scope=(
        'https://www.googleapis.com/auth/drive.file ',
        # added the scope above as suggested somewhere else,
        # but error occurs with and with-out this scope
        'https://www.googleapis.com/auth/drive',
        'https://spreadsheets.google.com/feeds',
        'https://docs.google.com/feeds'
    ),
    sub=impersonateUser
)

http = httplib2.Http()
http = credentials.authorize(http)
auth2token = gdata.gauth.OAuth2TokenFromCredentials(credentials)
# error will occur, wether using SpreadsheetsService() or SpreadsheetsClient()
#srv = gdata.spreadsheet.service.SpreadsheetsService()
#srv = auth2token.authorize(srv)

clt = gdata.spreadsheets.client.SpreadsheetsClient()
clt = auth2token.authorize(clt)
# Until here no errors

wks = clt.get_worksheets(spreadsheetKey)
# AccessTokenRefreshError: access_denied

这是我在远程shell中得到的错误：

s~my-gae-app> wks = clt.get_worksheets(spreadsheetKey)
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "gdata/spreadsheets/client.py", line 108, in get_worksheets
    **kwargs)
  File "gdata/client.py", line 640, in get_feed
    **kwargs)
  File "gdata/client.py", line 267, in request
    uri=uri, auth_token=auth_token, http_request=http_request, **kwargs)
  File "atom/client.py", line 122, in request
    return self.http_client.request(http_request)
  File "gdata/gauth.py", line 1344, in new_request
    refresh_response = self._refresh(request_orig)
  File "gdata/gauth.py", line 1485, in _refresh
    self.credentials._refresh(httplib2.Http().request)
  File "/usr/local/lib/python2.7/dist-packages/oauth2client/client.py", line 653, in _refresh
    self._do_refresh_request(http_request)
  File "/usr/local/lib/python2.7/dist-packages/oauth2client/client.py", line 710, in _do_refresh_request
    raise AccessTokenRefreshError(error_msg)
AccessTokenRefreshError: access_denied

我不确定这是否表明该服务帐户被拒绝访问电子表格，或者刷新访问令牌是否出错。 您知道此代码或设置有什么问题吗？

Answer 1

我发现没有sub参数（针对“模拟”用户）调用SignedJwtAssertionCredentials不会产生AccessTokenRefreshError: access_denied

import os
import httplib2
from google.appengine.api import memcache
from apiclient.discovery import build
from oauth2client.client import SignedJwtAssertionCredentials
import gdata.spreadsheets.client
import gdata.spreadsheet.service

# AppAssertionCredentials is not supported in gdata python client library,
# so we use SignedJwtAssertionCredentials with the credential 
# file of this service account.
# Load the key in PKCS 12 format that you downloaded from the Google API
# Console when you created your Service account.
clientEmail = '[e-mail]'
p12File = 'app.p12'
path = os.path.join(ROOT_DIR, 'data', 'oAuth2', p12File)
impersonateUser = '[email protected]'
spreadsheetKey = '1mcJHJ...................................juQMw' # ID copied from URL of desired spreadsheet in Google Drive
with open(path) as f:
    privateKey = f.read()
    f.close()

# Getting credentials with AppAssertionCredentials only worked successfully
# for Google API Client Library for Python, e.g. accessing file's meta-data.
# So we use SignedJwtAssertionCredentials, as suggested in
# http://stackoverflow.com/questions/16026286/using-oauth2-with-service-account-on-gdata-in-python
# but with-out the sub parameter!
credentials = SignedJwtAssertionCredentials(
    clientEmail,
    privateKey,
    scope=(
        'https://www.googleapis.com/auth/drive.file ',
        # added the scope above as suggested somewhere else,
        # but error occurs with and with-out this scope
        'https://www.googleapis.com/auth/drive',
        'https://spreadsheets.google.com/feeds',
        'https://docs.google.com/feeds'
    ),
#    sub=impersonateUser
)

http = httplib2.Http()
http = credentials.authorize(http)
auth2token = gdata.gauth.OAuth2TokenFromCredentials(credentials)
# this pattern would eventually also work using SpreadsheetsService()
# SpreadsheetsService methods are different from SpreadsheetsClient, though
#srv = gdata.spreadsheet.service.SpreadsheetsService()
#srv = auth2token.authorize(srv)

clt = gdata.spreadsheets.client.SpreadsheetsClient()
clt = auth2token.authorize(clt)

wks = clt.get_worksheets(spreadsheetKey)
# works now!