zaki-yama/index.html

## index.html
<!DOCTYPE html>
<html>
    <body>
        <ul>
            {% for task in tasks %}
            <li>
                {{ task.title }}
            </li>
            {% endfor %}
    </body>
</html>

## views.py
# -*- coding: utf-8 -*-
import httplib2
import logging
import os
import settings

from google.appengine.api import users

from apiclient.discovery import build
from oauth2client import xsrfutil
from oauth2client.appengine import StorageByKeyName
from oauth2client.client import flow_from_clientsecrets

from django.core.context_processors import csrf
from django.http import HttpResponseRedirect
from django.shortcuts import render, redirect
from django.views.generic.base import View

from .models import CredentialsModel


logger = logging.getLogger(__name__)

service = build('tasks', 'v1')

SCOPE = 'https://www.googleapis.com/auth/tasks'
CLIENT_SECRETS = os.path.join(os.path.dirname(__file__), '..', 'client_secrets.json')
FLOW = flow_from_clientsecrets(
        CLIENT_SECRETS,
        scope=SCOPE,
        redirect_uri='http://localhost:8080/task_manager/oauth2callback')


class MainView(View):
    template_name = 'task_manager/index.html'

    def get(self, request):
        user = users.get_current_user()
        storage = StorageByKeyName(
                CredentialsModel, user.email(), 'credentials')
        credentials = storage.get()
        if credentials is None or credentials.invalid == True:
            FLOW.params['state'] = xsrfutil.generate_token(settings.SECRET_KEY,
                    user)
            authorize_url = FLOW.step1_get_authorize_url()
            logging.info(authorize_url)
            return HttpResponseRedirect(authorize_url)
        else:
            http = httplib2.Http()
            http = credentials.authorize(http)
            service = build('tasks', 'v1', http=http)
            tasks = service.tasks().list(tasklist='@default').execute(http=http)
            template_values={
                    'app_name':request.resolver_match.app_name,
                    'tasks':tasks['items'],
                    }
            template_values.update(csrf(request))
            return render(request, self.template_name, template_values)


class AuthView(View):

    def get(self, request):
        user = users.get_current_user()
        credentials = FLOW.step2_exchange(request.REQUEST)
        storage = StorageByKeyName(
                CredentialsModel, user.email(), 'credentials')
        storage.put(credentials)
        return HttpResponseRedirect('/task_manager')
	<!DOCTYPE html>
	<html>
	<body>
	<ul>
	{% for task in tasks %}
	<li>
	{{ task.title }}
	</li>
	{% endfor %}
	</body>
	</html>
	# -- coding: utf-8 --
	import httplib2
	import logging
	import os
	import settings

	from google.appengine.api import users

	from apiclient.discovery import build
	from oauth2client import xsrfutil
	from oauth2client.appengine import StorageByKeyName
	from oauth2client.client import flow_from_clientsecrets

	from django.core.context_processors import csrf
	from django.http import HttpResponseRedirect
	from django.shortcuts import render, redirect
	from django.views.generic.base import View

	from .models import CredentialsModel


	logger = logging.getLogger(__name__)

	service = build('tasks', 'v1')

	SCOPE = 'https://www.googleapis.com/auth/tasks'
	CLIENT_SECRETS = os.path.join(os.path.dirname(__file__), '..', 'client_secrets.json')
	FLOW = flow_from_clientsecrets(
	CLIENT_SECRETS,
	scope=SCOPE,
	redirect_uri='http://localhost:8080/task_manager/oauth2callback')


	class MainView(View):
	template_name = 'task_manager/index.html'

	def get(self, request):
	user = users.get_current_user()
	storage = StorageByKeyName(
	CredentialsModel, user.email(), 'credentials')
	credentials = storage.get()
	if credentials is None or credentials.invalid == True:
	FLOW.params['state'] = xsrfutil.generate_token(settings.SECRET_KEY,
	user)
	authorize_url = FLOW.step1_get_authorize_url()
	logging.info(authorize_url)
	return HttpResponseRedirect(authorize_url)
	else:
	http = httplib2.Http()
	http = credentials.authorize(http)
	service = build('tasks', 'v1', http=http)
	tasks = service.tasks().list(tasklist='@default').execute(http=http)
	template_values={
	'app_name':request.resolver_match.app_name,
	'tasks':tasks['items'],
	}
	template_values.update(csrf(request))
	return render(request, self.template_name, template_values)


	class AuthView(View):

	def get(self, request):
	user = users.get_current_user()
	credentials = FLOW.step2_exchange(request.REQUEST)
	storage = StorageByKeyName(
	CredentialsModel, user.email(), 'credentials')
	storage.put(credentials)
	return HttpResponseRedirect('/task_manager')