from django.contrib.auth import get_user_model, login

from django.contrib.auth.models import Permission

from django.conf import settings

import requests

import re

import json

class MtdcOAuth2ClientCredentialsAuthentication(BaseAuthentication):

        if 'act_as' not in request.GET or 'HTTP_RENKAN_ACT_AS' not in request.META:

            return

        else:

            username = request.GET.get('act_as', request.META.get("HTTP_RENKAN_ACT_AS", ""))

        try: 

            user = get_user_model().objects.get(username=username)

        except get_user_model().DoesNotExist:

            return

        if 'HTTP_AUTHORIZATION' not in request.META:

            return

        else:

            token = re.search("(?<=\s).*", request.META["HTTP_AUTHORIZATION"]).group(0)

        token_validate_response = requests.get(

            settings.MTDC_VALIDATE_TOKEN_URL+token

        )

        if token_validate_response.status_code != 200:

            return