在 python 中的 gdata 上使用 OAuth2 和服务帐户

Question

我想使用data.photos.service.PhotosService 从 Picasa 推送和拉取照片。我从 Google 控制台获得了一个服务密钥文件 XXXXXXXX-privatekey.p12，现在我正在尝试使用该密钥与 google 进行身份验证。

OAUTH2 使用 appengine 的文档让我相信使用以下内容会很有用：

f = file(settings.SITE_ROOT + '/aurora/' + settings.PRIVATE_KEY, 'rb')
key = f.read()
f.close()

credentials = SignedJwtAssertionCredentials(settings.SERVICE_ACCOUNT_NAME, key, scope = 'http://picasaweb.google.com/data https://www.googleapis.com/auth/userinfo.email https://www.googleapis.com/auth/userinfo.profile')
http = httplib2.Http()
http = credentials.authorize(http)
service = build("oauth2", "v2", http=http)
user_info = None
try:
  user_info = service.userinfo().get().execute()
  # neither of these two methods work
  #gd_client.SetOAuthInputParameters(signature_method = gdata.auth.OAuthSignatureMethod.RSA_SHA1, consumer_key = "asdfasdfasdf.apps.googleusercontent.com", rsa_key = key, two_legged_oauth = True, requestor_id = user_info.get('email'))
  #gd_client.auth_token = gdata.gauth.TwoLeggedOAuthRsaToken(consumer_key = user_info.get('email'), rsa_private_key = key, requestor_id = user_info.get('email'))
except errors.HttpError, e:
  logging.error('An error occurred: %s', e)

user_inf0 = {u'verified_email': True, u'id': u'1234', u'name': u'asdfasdfasdf@developer.gserviceaccount.com', u'email': u'asdfasdfasdf@developer.gserviceaccount.com'}

问题是使用 SetOAuthInputParameters 的方法 1 返回无效令牌，或者方法 2 返回 403 restricted。

当我真的并且真的不想那样做时，我正在阅读大量的代码，这些代码都执行常规的 3 legged oauth。我还没有看到任何想法/文章吗？

Answer 1

使用 gdata.gauth.OAuth2TokenFromCredentials。

auth2token = gdata.gauth.OAuth2TokenFromCredentials(credentials)
gd_client = auth2token.authorize(gd_client)

OAuth2TokenFromCredentials 旨在帮助您同时使用 apiclient 和 gdata。在幕后，它使用凭据来确保它拥有执行 gdata 调用所需的身份验证信息。

请注意，如果您仍然得到 403，则可能完全是另外一回事。我正在使用服务帐户访问用户的数据并得到 403，因为我没有在 SignedJwtAssertionCredentials 调用中正确指定用户。

更新：这是我使用的基本模式：

from oauth2client.client import SignedJwtAssertionCredentials
credentials = SignedJwtAssertionCredentials(
    "XXXXXXXXXXX@developer.gserviceaccount.com",
    open("keyfile").read(),
    scope=(
        "https://www.googleapis.com/auth/drive",
        "https://spreadsheets.google.com/feeds",
        "https://docs.google.com/feeds"
    ), # For example.
    sub="user@gmail.com"
)
http = httplib2.Http()
http = credentials.authorize(http) # Not needed? See comment below.
auth2token = gdata.gauth.OAuth2TokenFromCredentials(credentials)
gd_client = gdata.photos.service.PhotosService() # For example.
gd_client = auth2token.authorize(gd_client)

Answer 2

如果您在 Google 帐户上使用 MFA，则需要使用同意屏幕身份验证方法。使用 Picassa API，它不能按原样工作，因为请求 API 略有不同。

import gdata.gauth
import os
import pickle
import gdata.photos.service

clientid='xxx'  # https://console.developers.google.com/apis/credentials
clientsecret='xxx'
Scope='https://picasaweb.google.com/data/'
User_agent='myself'

def GetAuthToken():
    if os.path.exists(".token"):
        with open(".token") as f:
            token = pickle.load(f)
    else:
        token = gdata.gauth.OAuth2Token(client_id=clientid,client_secret=clientsecret,scope=Scope,user_agent=User_agent)
        print token.generate_authorize_url(redirect_uri='urn:ietf:wg:oauth:2.0:oob')
        code = raw_input('What is the verification code? ').strip()
        token.get_access_token(code)
        with open(".token", 'w') as f:
            pickle.dump(token, f)
    return token


token = GetAuthToken()

gd_client = gdata.photos.service.PhotosService()
old_request = gd_client.request


def request(operation, url, data=None, headers=None):
    headers = headers or {}
    headers['Authorization'] = 'Bearer ' + token.access_token
    return old_request(operation, url, data=data, headers=headers)


gd_client.request = request
photos = gd_client.GetUserFeed(kind='photo', limit='10')
for photo in photos.entry:
    print 'Recently added photo title:', photo.title.text