text: """
  Copyright (c) 2015 Microsoft Open Technologies, Inc.
  
  All rights reserved.
  
  MIT License
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
  """
  
  """
  Azure AD OAuth2 backend, docs at:
      https://python-social-auth.readthedocs.io/en/latest/backends/azuread.html
  """
  import time
  
  from jwt import DecodeError, ExpiredSignature, decode as jwt_decode
  
  from ..exceptions import AuthTokenError
  from .oauth import BaseOAuth2
  
  
  class AzureADOAuth2(BaseOAuth2):
      name = 'azuread-oauth2'
      SCOPE_SEPARATOR = ' '
      AUTHORIZATION_URL = 'https://login.microsoftonline.com/common/oauth2/authorize'
      ACCESS_TOKEN_URL = 'https://login.microsoftonline.com/common/oauth2/token'
      ACCESS_TOKEN_METHOD = 'POST'
      REDIRECT_STATE = False
      DEFAULT_SCOPE = ['openid', 'profile', 'user_impersonation']
      EXTRA_DATA = [
          ('access_token', 'access_token'),
          ('id_token', 'id_token'),
          ('refresh_token', 'refresh_token'),
          ('expires_in', 'expires'),
          ('expires_on', 'expires_on'),
          ('not_before', 'not_before'),
          ('given_name', 'first_name'),
          ('family_name', 'last_name'),
          ('token_type', 'token_type')
      ]
  
      def get_user_id(self, details, response):
          """Use upn as unique id"""
          return response.get('upn')
  
      def get_user_details(self, response):
          """Return user details from Azure AD account"""
          fullname, first_name, last_name = (
              response.get('name', ''),
              response.get('given_name', ''),
              response.get('family_name', '')
          )
          return {'username': fullname,
                  'email': response.get('upn'),
                  'fullname': fullname,
                  'first_name': first_name,
                  'last_name': last_name}
  
      def user_data(self, access_token, *args, **kwargs):
          response = kwargs.get('response')
          id_token = response.get('id_token')
          try:
              decoded_id_token = jwt_decode(id_token, verify=False)
          except (DecodeError, ExpiredSignature) as de:
              raise AuthTokenError(self, de)
          return decoded_id_token
  
      def auth_extra_arguments(self):
          """Return extra arguments needed on auth process. The defaults can be
          overriden by GET parameters."""
          extra_arguments =  super(AzureADOAuth2, self).auth_extra_arguments()
          resource = self.setting('RESOURCE')
          if resource:
              extra_arguments.update({'resource': resource})
          return extra_arguments
  
      def extra_data(self, user, uid, response, details=None, *args, **kwargs):
          """Return access_token and extra defined names to store in
          extra_data field"""
          data = super(AzureADOAuth2, self).extra_data(user, uid, response,
              details, *args, **kwargs)
          data['resource'] = self.setting('RESOURCE')
          return data
  
      def refresh_token_params(self, token, *args, **kwargs):
          return {
              'client_id': self.setting('KEY'),
              'client_secret': self.setting('SECRET'),
              'refresh_token': token,
              'grant_type': 'refresh_token',
              'resource': self.setting('RESOURCE')
          }
  
      def get_auth_token(self, user_id):
          """Return the access token for the given user, after ensuring that it
          has not expired, or refreshing it if so."""
          user = self.get_user(user_id=user_id)
          access_token = user.social_user.access_token
          expires_on = user.social_user.extra_data['expires_on']
          if expires_on <= int(time.time()):
              new_token_response = self.refresh_token(token=access_token)
              access_token = new_token_response['access_token']
          return access_token
  