未能使用服务帐户授权连接自己的GAE端点API

时间:2014-09-15 01:23:52

标签: python google-app-engine oauth-2.0 service-accounts server-to-server

我试图成功授权使用OAuth2和服务帐户从python脚本运行的Google App Engine(GAE)项目中的API命中,我一直在砸墙。

我创建了服务帐户,将服务帐户ID添加到api文件中允许的客户端ID,将私钥从.p12转换为.pem,并授权httplib2调用。我尝试使用.authorize()方法传递凭据,并将凭据加载为JSON并手动将access_token参数添加到标头中 - {"Authorization": "Bearer " + token_string}.

每次调用API都会产生"无效令牌"。

我注意到一件奇怪的事情,当我第一次调用SignedJwtAssertionCredentials时,凭证中没有访问令牌 - " access_token"是没有。但是,当我从存储中的.dat文件中检索凭据时,访问令牌会显示。

以下是GAE endpoints_api.py文件,python_test.py文件和401响应。

任何想法都会受到高度赞赏。

首先是应用引擎端点服务器文件:

# endpoints_api.py running on GAE

import endpoints
import time
from protorpc import messages
from protorpc import message_types
from protorpc import remote

SERVICE_ACCOUNT_ID = 'random_account_id_string.apps.googleusercontent.com'
WEB_CLIENT_ID = 'random_web_client_id_string.apps.googleusercontent.com'
ANDROID_AUDIENCE = WEB_CLIENT_ID

package = "MyPackage"

class Status(messages.Message):
    message = messages.StringField(1)
    when = messages.IntegerField(2)

class StatusCollection(messages.Message):
    items = messages.MessageField(Status, 1, repeated=True)

STORED_STATUSES = StatusCollection(items=[
    Status(message='Go.', when=int(time.time())),
    Status(message='Balls.', when=int(time.time())),
    Status(message='Deep!', when=int(time.time())),
])

@endpoints.api(name='myserver', version='v1')
class MyServerApi(remote.Service):
    """MyServer API v1."""

    @endpoints.method(message_types.VoidMessage, StatusCollection,
                  allowed_client_ids=[SERVICE_ACCOUNT_ID,
                                      endpoints.API_EXPLORER_CLIENT_ID],
                  audiences=[ANDROID_AUDIENCE],
                  scopes=[endpoints.EMAIL_SCOPE],
                  path='status', http_method='GET',
                  name='statuses.listStatus')
    def statuses_list(self, unused_request):
        current_user = endpoints.get_current_user()
        if current_user is None:
            raise endpoints.UnauthorizedException('Invalid token.')
        else:
            return current_user.email(), STORED_STATUSES

APPLICATION = endpoints.api_server([MyServerApi])

接下来是本地python脚本:

# python_test.py file running from local server

from apiclient.discovery import build
from oauth2client.file import Storage
from oauth2client.client import SignedJwtAssertionCredentials
import httplib2
import os.path
import json

SERVICE_ACCOUNT_EMAIL = "service_account_string@developer.gserviceaccount.com"
ENDPOINT_URL = "http://my-project.appspot.com/_ah/api/myserver/v1/status"
SCOPE = 'https://www.googleapis.com/auth/userinfo.email'
SITE_ROOT = os.path.dirname(os.path.realpath(__file__))

f = file('%s/%s' % (SITE_ROOT, 'pk2.pem'), 'rb')
key = f.read()
f.close()

http = httplib2.Http()
storage = Storage('credentials.dat')
credentials = storage.get()

if credentials is None or credentials.invalid:
    credentials = SignedJwtAssertionCredentials(
        SERVICE_EMAIL, key, scope=SCOPE)
    storage.put(credentials)
else:
    credentials.refresh(http)

http = credentials.authorize(http)
headers = {'Content-Type': 'application/json'}

(resp, content) = http.request(ENDPOINT_URL,
                           "GET",
                           headers=headers)

print(resp)
print(content)

最后,控制台输出:

{'status': '401', 'alternate-protocol': '443:quic,p=0.002', 'content-length': '238', 'x- xss-protection': '1; mode=block', 'x-content-type-options': 'nosniff', 'transfer-encoding': 'chunked', 'expires': 'Sun, 14 Sep 2014 23:51:36 GMT', 'server': 'GSE', '-content-encoding': 'gzip', 'cache-control': 'private, max-age=0', 'date': 'Sun, 14 Sep 2014 23:51:36 GMT', 'x-frame-options': 'SAMEORIGIN', 'content-type': 'application/json; charset=UTF-8', 'www-authenticate': 'Bearer realm="https://accounts.google.com/AuthSubRequest"'}

{
 "error": {
  "errors": [
   {
    "domain": "global",
    "reason": "required",
    "message": "Invalid token.",
    "locationType": "header",
    "location": "Authorization"
   }
  ],
  "code": 401,
  "message": "Invalid token."
 }
}

1 个答案:

答案 0 :(得分:0)

感谢您的帮助。我上面做了几件事。

首先,我需要在允许的ID列表中引用app引擎项目ID。

API_ID = 'project-id-number.apps.googleusercontent.com'

@endpoints.method(message_types.VoidMessage, StatusCollection,
              allowed_client_ids=[API_ID, SERVICE_ACCOUNT_ID,
                                  endpoints.API_EXPLORER_CLIENT_ID],
              audiences=[ANDROID_AUDIENCE],
              scopes=[endpoints.EMAIL_SCOPE],
              path='status', http_method='GET',
              name='statuses.listStatus')

我错误地认为build()方法只适用于官方谷歌APIS,但事实证明我错误地引用了我的项目。有了项目ID,我可以使用build()而不是在服务器端文件中编写我自己的httplib2调用(这不起作用)。

删除'http = credentials.authorize(http)'下面的代码,我将其替换为以下代码:

myservice = build('my-service', 'v1', http=http, discoveryServiceUrl=discoveryServiceUrl)
data = myservice.my-path().endpoint-name()
results = data.execute()

这成功授权我的帐户并调用端点。活泉!如果其他人对此有疑问,或者我的解决方案不明确,请随时发表评论。这是一个我不希望任何其他人痛苦的过程。