from django.contrib.auth.backends import BaseBackend
from django.contrib.auth.models import User

from main.views import decode_access_token


class KeycloakBackend(BaseBackend):
    def authenticate(self, request, token=None):
        # Ваш код для проверки токена через Keycloak и извлечения информации о пользователе
        user_info = decode_access_token(token)
        if user_info:
            user, created = User.objects.get_or_create(username=user_info['preferred_username'],
                                                       defaults={'first_name': user_info.get('given_name', ''),
                                                                 'last_name': user_info.get('family_name', ''),
                                                                 'email': user_info.get('email', '')})
            return user
        return None

    def get_user(self, user_id):
        try:
            return User.objects.get(pk=user_id)
        except User.DoesNotExist:
            return None