import re

import jwt
from django.http import HttpResponse
# from jwt import exceptions
from rest_framework.exceptions import AuthenticationFailed

from apps.user.models import User, Role


class RoleControl(object):
    """使用类装饰器来权限校验"""
    def __init__(self, func):
        self.func = func

    def __call__(self, request, *args, **kwargs):
        token = request.META.get('HTTP_ACCESSTOKEN')
        SALT = 'django-insecure-zo64fvv02msf-se7!dek5*w$17#3nh6zta#!i=79bt9d#f88@i'

        try:
            payload = jwt.decode(token, SALT, True)
        # except exceptions.ExpiredSignatureError:
        #     raise AuthenticationFailed({'code': 1003, "error": "token已失效"})
        except jwt.DecodeError:
            raise AuthenticationFailed({'code': 1003, 'error': "token认证失败"})
        except jwt.InvalidTokenError:
            raise AuthenticationFailed({'code': 1003, 'error': "非法token"})

        user = User.objects.get(id=payload['userid'])

        role = Role.objects.get(id="TestLaboratory_V1_Role_"+str(user.identify+1))
        permission = role.permissions.filter(method=request.method)

        match = False
        path = request.path
        if path[-1] == '\n':
            path = path[:-1]
        if path[-1] == '/':
            path = path[:-1]
        for per in permission:
            if re.fullmatch(per.url, path):
                match = True
                break

        if not match:
            return HttpResponse(status=500, content='用户无访问权限')

        return self.func(request, *args, **kwargs)