在Django 4升级后，Apple SSO（即苹果账号单点登录）出现了问题。解决方法是使用Python的Authlib库来支持Apple SSO。以下是代码示例：

pip install authlib

from authlib.integrations.requests_client import RequestsClient
from social_core.backends.apple import AppleIdAuth
from django.conf import settings

class AppleSSOAuth(AppleIdAuth):
    OIDC_ENDPOINT = 'https://appleid.apple.com'  # use this for production
    JWK_SET_URL = 'https://appleid.apple.com/auth/keys'  # use this for production

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        session = requests.Session()
        session.verify = False
        client = RequestsClient(session=session)
        self.client = client

    def auth_params(self, *args, **kwargs):
        params = super().auth_params(*args, **kwargs)
        params['response_mode'] = 'form_post'
        params['response_type'] = 'code id_token'
        return params

    def user_data(self, access_token, *args, **kwargs):
        apple_public_key = self.get_apple_public_key()
        user_data = super().user_data(access_token, *args, **kwargs)
        return {
            'provider': self.name,
            'id': user_data.get('sub'),
            'email': user_data.get('email'),
            'first_name': user_data.get('first_name', ''),
            'last_name': user_data.get('last_name', ''),
            'access_token': access_token,
            'apple_public_key': apple_public_key
        }

    def get_apple_public_key(self):
        jwk_set = self.client.get(self.JWK_SET_URL).json()
        kid = self.jwt_headers()['kid']
        for jwk in jwk_set['keys']:
            if jwk['kid'] == kid:
                public_key = jwk['n'] + '\n' + jwk['e']
                break
        return public_key

SOCIAL_AUTH_APPLE_KEY = settings.SOCIAL_AUTH_APPLE_KEY
SOCIAL_AUTH_APPLE_SECRET =