Misago/misago/users/decorators.py

from django.conf import settings
from django.core.exceptions import PermissionDenied
from django.shortcuts import redirect
from django.utils.translation import ugettext as _

from misago.core.exceptions import Banned

from .bans import get_request_ip_ban
from .models import Ban


def deny_authenticated(f):
    def decorator(request, *args, **kwargs):
        if request.user.is_authenticated:
            raise PermissionDenied(_("This page is not available to signed in users."))
        else:
            return f(request, *args, **kwargs)

    return decorator


def deny_guests(f):
    def decorator(request, *args, **kwargs):
        if request.user.is_anonymous:
            if request.GET.get('ref') == 'login':
                return redirect(settings.LOGIN_REDIRECT_URL)
            raise PermissionDenied(_("You have to sign in to access this page."))
        else:
            return f(request, *args, **kwargs)

    return decorator


def deny_banned_ips(f):
    def decorator(request, *args, **kwargs):
        ban = get_request_ip_ban(request)
        if ban:
            hydrated_ban = Ban(
                check_type=Ban.IP, user_message=ban['message'], expires_on=ban['expires_on']
            )
            raise Banned(hydrated_ban)
        else:
            return f(request, *args, **kwargs)

    return decorator