from django.utils.deprecation import MiddlewareMixin
from django.shortcuts import render,redirect

class UserMiddleware(MiddlewareMixin):#django中有三个中间键
    def process_request(self,request):
        path = request.path_info
        if path == '/SS01/login/' or path == '/SS01/register/':
            return None
        else:
            if not request.session.get('username'):# 如果进入了/SS01/index这样的地址
                return redirect('/SS01/login/')
            else:
                return None


    def process_view(self,request,callback,callback_args,callback_kwargs):
        pass

    def process_response(self,request,response):
        return response