from django.http import HttpResponse
from django.shortcuts import render, redirect
from django.urls import reverse
from django.utils.deprecation import MiddlewareMixin
from MidUpVcode.settings import BLACK_LIST, VIP_LIST
'''
所有的鉤子函數(shù)都可以返回一個Response
一旦鉤子函數(shù)返回了Response,整個請求的受理就結(jié)束了
'''
# 繼承于框架中間件
class MyappMiddleware(MiddlewareMixin):
 # 中間件的初始化方法,全局執(zhí)行一次
 # def __init__(self, get_response=None):
 #   super(MyappMiddleware, self).__init__()
 #   print(">>>>>>>>>> MyappMiddlware __init__")
 # 下鉤子于所有路由被交給路由表之前
 def process_request(self, request):
   # 獲取客戶端IP地址
   clientIp = request.META['REMOTE_ADDR']
   # 請求的路由
   url = request.path
   print(">>> process_request", request, clientIp, url)
   # # 屏蔽黑名單用戶
   # 只要客戶端IP在黑名單中
   # if clientIp in BLACK_LIST:
   #   直接渲染fuckoff.html并立刻返回
   #   return render(request,'fuckoff.html')
   # # 當VIP用戶訪問福利頁面時提供更多好的服務(wù)
   # if clientIp in VIP_LIST and url=='/myapp/fuli/':
   #   return render(request, 'fuli.html', context={'imgpath': 'meinv1.jpg'})
   # 福利頁必須登錄了才能查看
   if url == '/myapp/fuli/' and not request.session.get('uname', None):
     return redirect(reverse('myapp:login'))
 # 下鉤子于所有路由請求被交給視圖函數(shù)之前
 def process_view(self, request, view_func, view_args, view_kwargs):
   print(">>> process_view", request, view_func, view_args, view_kwargs)
 # 理論上下鉤子于所有路由請求的模板被渲染完成以后
 # 這個函數(shù)實測無法回調(diào)
 def process_template_response(self, request, response):
   print(">>>>>>>>>> process_template_response", request, response)
   return response
 # 下鉤子于所有路由的響應(yīng)被返回之前
 def process_response(self, request, response):
   print(">>>>>>>>>> process_response", request, response)
   return response
 def process_exception(self, request, exception):
   print(">>>>>>>>>> process_exception", request, exception)
   return redirect('/')

class LearnAOP(MiddlewareMixin):
  def process_request(self,request):
    print('request的路徑',request.GET.path)

MIDDLEWARE = [
  ...
  # 注冊自定義的中間件
  'middleware.MyMiddleware.MyappMiddleware',
  ...
]