# utils.py
from re import compile
from django.conf import settings
from django.shortcuts import redirect, reverse
from django.utils.deprecation import MiddlewareMixin

login_required_urls = [compile(expr) for expr in getattr(settings, 'LOGIN_REQUIRED_URLS', [])]


class LoginRequiredMiddleware(MiddlewareMixin):
    def process_request(self, request):
        if not request.user.is_authenticated:
            path = request.path_info.lstrip('/')
            if any(m.match(path) for m in login_required_urls):
                return redirect('{}?next={}'.format(reverse(settings.LOGIN_URL), request.path))