text: """
  MSN Live Connect oAuth 2.0
  
  Settings:
  LIVE_CLIENT_ID
  LIVE_CLIENT_SECRET
  LIVE_EXTENDED_PERMISSIONS (defaults are: wl.basic, wl.emails)
  
  References:
  * oAuth  http://msdn.microsoft.com/en-us/library/live/hh243649.aspx
  * Scopes http://msdn.microsoft.com/en-us/library/live/hh243646.aspx
  * REST   http://msdn.microsoft.com/en-us/library/live/hh243648.aspx
  
  Throws:
  AuthUnknownError - if user data retrieval fails
  """
  from urllib import urlencode
  
  try:
      import json as simplejson
  except ImportError:
      try:
          import simplejson
      except ImportError:
          from django.utils import simplejson
  
  from social_auth.utils import dsa_urlopen
  from social_auth.backends import BaseOAuth2, OAuthBackend
  from social_auth.exceptions import AuthUnknownError
  
  
  # Live Connect configuration
  LIVE_AUTHORIZATION_URL = 'https://login.live.com/oauth20_authorize.srf'
  LIVE_ACCESS_TOKEN_URL = 'https://login.live.com/oauth20_token.srf'
  LIVE_USER_DATA_URL = 'https://apis.live.net/v5.0/me'
  LIVE_SERVER = 'live.com'
  LIVE_DEFAULT_PERMISSIONS = ['wl.basic', 'wl.emails']
  
  
  class LiveBackend(OAuthBackend):
      name = 'live'
  
      EXTRA_DATA = [
          ('id', 'id'),
          ('access_token', 'access_token'),
          ('reset_token', 'reset_token'),
          ('expires', 'expires'),
          ('email', 'email'),
          ('first_name', 'first_name'),
          ('last_name', 'last_name'),
      ]
  
      def get_user_id(self, details, response):
          return response['id']
  
      def get_user_details(self, response):
          """Return user details from Live Connect account"""
          try:
              email = response['emails']['account']
          except KeyError:
              email = ''
  
          return {'username': response.get('name'),
                  'email': email,
                  'first_name': response.get('first_name'),
                  'last_name': response.get('last_name')}
  
  
  class LiveAuth(BaseOAuth2):
      AUTHORIZATION_URL = LIVE_AUTHORIZATION_URL
      ACCESS_TOKEN_URL = LIVE_ACCESS_TOKEN_URL
      AUTH_BACKEND = LiveBackend
      SETTINGS_KEY_NAME = 'LIVE_CLIENT_ID'
      SETTINGS_SECRET_NAME = 'LIVE_CLIENT_SECRET'
      SCOPE_SEPARATOR = ','
      SCOPE_VAR_NAME = 'LIVE_EXTENDED_PERMISSIONS'
      DEFAULT_SCOPE = LIVE_DEFAULT_PERMISSIONS
  
      def user_data(self, access_token, *args, **kwargs):
          """Loads user data from service"""
          url = LIVE_USER_DATA_URL + '?' + urlencode({
              'access_token': access_token
          })
          try:
              return simplejson.load(dsa_urlopen(url))
          except (ValueError, IOError):
              raise AuthUnknownError('Error during profile retrieval, '
                                     'please, try again later')
  
  
  # Backend definition
  BACKENDS = {
      'live': LiveAuth,
  }
  