我尝试使用为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电子表格。
my-gae-app@appspot.gserviceaccount.com以及此服务帐户显示的电子邮件地址，并在下面的代码中分配给clientEmail变量。不确定实际需要哪两个电子邮件地址，所以我分配了两个。具有impersonateUser电子邮件地址的用户也具有对此电子表格的读写权限。借助Google API Python客户端AppAssertionCredentials，我可以通过Google Drive API访问所需电子表格的元数据。但是，如果我尝试使用gdata访问电子表格的内容，我会收到错误。到目前为止，我使用服务帐户获得的最佳结果是使用SignedJwtAssertionCredentials，as described here。但是，我坚持这个AccessRefreshTokenError: access denied并且我不明白出了什么问题。
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 = '10346........-g3dp......................3m1em8@developer.gserviceaccount.com'
p12File = 'app.p12'
path = os.path.join(ROOT_DIR, 'data', 'oAuth2', p12File)
impersonateUser = 'user@mygoogleappsdomain.com'
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中遇到的错误：
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
我不确定这是否表示此服务帐户被拒绝访问电子表格，或者刷新访问令牌时是否有错误。你知道这段代码或设置有什么问题吗？
答案 0 :(得分：3)
我已经发现，调出SignedJwtAssertionCredentials而不使用sub参数（对于＆＃34;模仿＆＃34;用户）将不会产生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 = '10346........-g3dp......................3m1em8@developer.gserviceaccount.com'
p12File = 'app.p12'
path = os.path.join(ROOT_DIR, 'data', 'oAuth2', p12File)
impersonateUser = 'user@mygoogleappsdomain.com'
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!