import re


class Authentication(object):
    def __init__(self, username, token, uuid, session_id, user_attributes):
        self.username = username
        self.token = token
        self.uuid = uuid
        self.session_id = session_id
        self._user_attributes = user_attributes

    def is_admin(self):
        return self._user_attributes.get('is_admin', False)


class Authenticator(object):
    def __init__(self, domain):
        self.domain = domain

    def authenticate(self, username, password):
        self.username = self.validate_username(username)
        self.srp_auth(username, password)

    def validate_username(self, username):
        if '@' not in username:
            return True
        extracted_username = self.extract_username(username)
        return self.username_with_domain(extracted_username) == username

    def extract_username(self, username):
        return re.search('^([^@]+)@?.*$', username).group(1)

    def username_with_domain(self, username):
        return '%s@%s' % (username, self.domain)