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diff --git a/app01/middleware/auth.py b/app01/middleware/auth.py
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+++ b/app01/middleware/auth.py
@@ -0,0 +1,20 @@
+from django.utils.deprecation import MiddlewareMixin
+from django.shortcuts import HttpResponse, redirect
+
+
+class AuthMiddleware(MiddlewareMixin):
+
+    def process_request(self, request):
+        # 0.排除那些不需要登录就能访问的页面
+        #   request.path_info 获取当前用户请求的URL /login/
+        if request.path_info in ["/login/", "/image/code/"]:
+            return
+        # 1.读取当前访问的用户的session信息，如果能读到，说明已登陆过，就可以继续向后走。
+        info_dict = request.session.get("info")
+        # print(info_dict)
+        if info_dict:
+            return
+
+
+        # 2.没有登录过，重新回到登录页面
+        return redirect('/login/')