text: # Copyright (C) 2011 Google Inc.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import webapp2
  from webapp2_extras import jinja2
  
  from apiclient.discovery import build
  from oauth2client.appengine import OAuth2Decorator
  
  import settings
  
  decorator = OAuth2Decorator(client_id=settings.CLIENT_ID,
                              client_secret=settings.CLIENT_SECRET,
                              scope=settings.SCOPE)
  service = build('tasks', 'v1')
  
  
  class MainHandler(webapp2.RequestHandler):
  
    def render_response(self, template, **context):
      renderer = jinja2.get_jinja2(app=self.app)
      rendered_value = renderer.render_template(template, **context)
      self.response.write(rendered_value)
  
    @decorator.oauth_aware
    def get(self):
      if decorator.has_credentials():
        result = service.tasks().list(tasklist='@default').execute(
            http=decorator.http())
        tasks = result.get('items', [])
        for task in tasks:
          task['title_short'] = truncate(task['title'], 26)
        self.render_response('index.html', tasks=tasks)
      else:
        url = decorator.authorize_url()
        self.render_response('index.html', tasks=[], authorize_url=url)
  
  
  def truncate(s, l):
    return s[:l] + '...' if len(s) > l else s
  
  
  application = webapp2.WSGIApplication([
      ('/', MainHandler),
      (decorator.callback_path, decorator.callback_handler()),
      ], debug=True)
  