boards/middlewares.py

from django.shortcuts import redirect
from boards import views, utils
from boards.models import Ban


class BanMiddleware:
    """This is run before showing the thread. Banned users don't need to see
    anything"""

    def process_view(self, request, view_func, view_args, view_kwargs):

        if view_func != views.you_are_banned:
            ip = utils.get_client_ip(request)
            is_banned = Ban.objects.filter(ip=ip).exists()

            if is_banned:
                return redirect(views.you_are_banned)