权限中间件

实现功能：白名单，正则匹配权限

from django.utils.deprecation import MiddlewareMixin
from django.shortcuts import redirect,HttpResponse
import re


class PermissionMiddleware(MiddlewareMixin):
    def process_request(self,request):
        # 获取当前用户访问的url
        current_path = request.path
        # 用户访问白名单
        white_list = ['/login/','/register/','/index/','/admin/*']
        for item in white_list:
            res = re.search(item,current_path)
            if res:
                return None

        # 先校验当前用户是否登录
        if not request.session.get('username'):
            return redirect('/login')
        # 获取当前用户所有的权限
        permission_list = request.session.get("permission_list")
        if permission_list:
            for permission in permission_list:
                permission = '^%s$'%permission
                res = re.search(permission,current_path)
                if res:
                    return None
        return HttpResponse('没有权限')