from django.utils import timezone
from django.contrib.auth import logout

class CheckSessionMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response

    def __call__(self, request):
        # 检查会话是否过期
        if request.session.get_expiry_age() <= 0:
            logout(request)  # 注销用户
            request.session.flush()  # 清除会话数据
            # 这里可以重定向到登录页面或显示会话过期提示
        response = self.get_response(request)
        return response