text: """
  Fitbit OAuth support.
  
  This contribution adds support for Fitbit OAuth service. The settings
  FITBIT_CONSUMER_KEY and FITBIT_CONSUMER_SECRET must be defined with the values
  given by Fitbit application registration process.
  
  By default account id, username and token expiration time are stored in
  extra_data field, check OAuthBackend class for details on how to extend it.
  """
  from social.backends.oauth import BaseOAuth1
  
  
  class FitbitOAuth(BaseOAuth1):
      """Fitbit OAuth authentication backend"""
      name = 'fitbit'
      AUTHORIZATION_URL = 'https://api.fitbit.com/oauth/authorize'
      REQUEST_TOKEN_URL = 'https://api.fitbit.com/oauth/request_token'
      ACCESS_TOKEN_URL = 'https://api.fitbit.com/oauth/access_token'
      EXTRA_DATA = [('encodedId', 'id'),
                    ('displayName', 'username')]
  
      def get_user_details(self, response):
          """Return user details from Fitbit account"""
          return {'username': response.get('displayName'),
                  'email': ''}
  
      def user_data(self, access_token, *args, **kwargs):
          """Loads user data from service"""
          return self.get_json(
              'https://api.fitbit.com/1/user/-/profile.json',
              auth=self.oauth_auth(access_token)
          )['user']
  