text: #!/usr/bin/env python
  #
  # Copyright 2014 Google Inc. All Rights Reserved.
  #
  # 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.
  #
  """Starting template for Google App Engine applications.
  
  Use this project as a starting point if you are just beginning to build a Google
  App Engine project. Remember to download the OAuth 2.0 client secrets which can
  be obtained from the Developer Console <https://code.google.com/apis/console/>
  and save them as 'client_secrets.json' in the project directory.
  """
  
  __author__ = 'jcgregorio@google.com (Joe Gregorio)'
  
  
  import httplib2
  import logging
  import os
  import pickle
  
  from googleapiclient import discovery
  from oauth2client import client
  from oauth2client.contrib import appengine
  from google.appengine.api import memcache
  
  import webapp2
  import jinja2
  
  
  JINJA_ENVIRONMENT = jinja2.Environment(
      loader=jinja2.FileSystemLoader(os.path.dirname(__file__)),
      autoescape=True,
      extensions=['jinja2.ext.autoescape'])
  
  # CLIENT_SECRETS, name of a file containing the OAuth 2.0 information for this
  # application, including client_id and client_secret, which are found
  # on the API Access tab on the Google APIs
  # Console <http://code.google.com/apis/console>
  CLIENT_SECRETS = os.path.join(os.path.dirname(__file__), 'client_secrets.json')
  
  # Helpful message to display in the browser if the CLIENT_SECRETS file
  # is missing.
  MISSING_CLIENT_SECRETS_MESSAGE = """
  <h1>Warning: Please configure OAuth 2.0</h1>
  <p>
  To make this sample run you will need to populate the client_secrets.json file
  found at:
  </p>
  <p>
  <code>%s</code>.
  </p>
  <p>with information found on the <a
  href="https://code.google.com/apis/console">APIs Console</a>.
  </p>
  """ % CLIENT_SECRETS
  
  
  http = httplib2.Http(memcache)
  service = discovery.build("plus", "v1", http=http)
  decorator = appengine.oauth2decorator_from_clientsecrets(
      CLIENT_SECRETS,
      scope='https://www.googleapis.com/auth/plus.me',
      message=MISSING_CLIENT_SECRETS_MESSAGE)
  
  class MainHandler(webapp2.RequestHandler):
  
    @decorator.oauth_aware
    def get(self):
      variables = {
          'url': decorator.authorize_url(),
          'has_credentials': decorator.has_credentials()
          }
      template = JINJA_ENVIRONMENT.get_template('grant.html')
      self.response.write(template.render(variables))
  
  
  class AboutHandler(webapp2.RequestHandler):
  
    @decorator.oauth_required
    def get(self):
      try:
        http = decorator.http()
        user = service.people().get(userId='me').execute(http=http)
        text = 'Hello, %s!' % user['displayName']
  
        template = JINJA_ENVIRONMENT.get_template('welcome.html')
        self.response.write(template.render({'text': text }))
      except client.AccessTokenRefreshError:
        self.redirect('/')
  
  
  app = webapp2.WSGIApplication(
      [
       ('/', MainHandler),
       ('/about', AboutHandler),
       (decorator.callback_path, decorator.callback_handler()),
      ],
      debug=True)
  