Django 1.7 google oauth2 令牌验证失败

我正在尝试完成验证 Google 令牌的过程，以便在 Django 应用程序中访问用户的日历。尽管我遵循了网上找到的一些指示，但我的回调函数仍然收到 400 错误代码响应（错误请求）。

views.py

# -*- coding: utf-8 -*-
import os

import argparse
import httplib2
import logging

from apiclient.discovery import build
from oauth2client import tools
from oauth2client.django_orm import Storage
from oauth2client import xsrfutil
from oauth2client.client import flow_from_clientsecrets

from django.http import HttpResponse
from django.http import HttpResponseBadRequest
from django.http import HttpResponseRedirect
from django.shortcuts import render_to_response
from django.core.urlresolvers import reverse
from django.contrib import auth
from django.contrib.auth.decorators import login_required
from django.conf import settings

from apps.tecnico.models import Credentials, Flow

CLIENT_SECRETS = os.path.join(
    os.path.dirname(__file__), '../../client_secrets.json')

@login_required
def index(request):
    storage = Storage(Credentials, 'id', request.user, 'credential')
    FLOW = flow_from_clientsecrets(
        CLIENT_SECRETS,
        scope='https://www.googleapis.com/auth/calendar.readonly',
        redirect_uri='http://MY_URL:8000/oauth2/oauth2callback'
    )
    credential = storage.get()
    if credential is None or credential.invalid is True:
        FLOW.params['state'] = xsrfutil.generate_token(
            settings.SECRET_KEY, request.user)
        authorize_url = FLOW.step1_get_authorize_url()
        f = Flow(id=request.user, flow=FLOW)
        f.save()
        return HttpResponseRedirect(authorize_url)
    else:
        http = httplib2.Http()
        http = credential.authorize(http)
        service = build(serviceName='calendar', version='v3', http=http,
                        developerKey='MY_DEV_KEY_FROM_GOOGLE_CONSOLE')

        events = service.events().list(calendarId='primary').execute()
        return render_to_response('calendario/welcome.html', {
            'events': events['items'],
        })


@login_required
def auth_return(request):
    if not xsrfutil.validate_token(
            settings.SECRET_KEY, request.REQUEST['state'], request.user):
        return HttpResponseBadRequest()

    storage = Storage(Credentials, 'id', request.user, 'credential')
    FLOW = Flow.objects.get(id=request.user).flow
    credential = FLOW.step2_exchange(request.REQUEST)
    storage.put(credential)
    return HttpResponseRedirect("http://MY_URL:8000/caly")

模型.py

from oauth2client.django_orm import FlowField, CredentialsField

[...]

class Credentials(models.Model):
    id = models.ForeignKey(User, primary_key=True)
    credential = CredentialsField()


class Flow(models.Model):
    id = models.ForeignKey(User, primary_key=True)
    flow = FlowField()

我已经下载了client_secrets.json直接从 Google Dev Console 获取文件。 开发控制台中指定的客户端ID类型是“Web应用程序”，我认为这是正确的。 我注意到的是，如果删除令牌验证代码块：

if not xsrfutil.validate_token(
        settings.SECRET_KEY, request.REQUEST['state'], request.user):
    return HttpResponseBadRequest()

一切正常，流程和凭证正确存储在数据库中，并且我可以读取日历。我可能做错了什么？

EDIT：我还检查了传出（至 Google）和传入（至回调）数据：

OUTGOING:

request.user:
admin
settings.SECRET_KEY:
I_AM_NOT_WRITING_IT_HERE
FLOW.params['state']:
SOME_OTHER_RANDOM_STUFF

INCOMING:

request.user:
admin
settings.SECRET_KEY:
I_AM_NOT_WRITING_IT_HERE
FLOW.params['state']:
SOME_OTHER_RANDOM_STUFF

数据是相同的，至少是相同的print来安慰。此外，通过控制台的生成/验证操作正常工作（xsrfutil.validate_token 返回 True，无论是测试数据还是真实数据，包括用户模型实例）。我更纳闷了。

我已经为同样的问题苦苦挣扎了几个小时，并且我找到了 @Ryan Spaulding 和 @Hans Z 回答的解决方案。有用！

这是因为 Django 1.7 使用 request.REQUEST 返回上述状态变量的 unicode 对象。我之前使用的是 Django 1.6，它用来返回一个字符串。

人们可以在这里找到更多细节。https://github.com/google/google-api-python-client/issues/58 https://github.com/google/google-api-python-client/issues/58我写这篇文章供将来参考。

if not xsrfutil.validate_token(
    settings.SECRET_KEY, 
    str(request.REQUEST['state']), 
    request.user):
return HttpResponseBadRequest()