Bans are deleted when they expire after a user tries to post

If a user had a ban previously, range-ban or single IP, which has since
expired, they will not be redirected to the "you are banned" page and
the active bans are deleted.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

board/views.py

@@ -1,12 +1,12 @@
 from django.conf import settings
 from django.http import Http404, HttpResponseRedirect
 from django.shortcuts import get_object_or_404
-from django.views.generic import DetailView
 from django.views.generic.base import TemplateView
 from django.views.generic.edit import CreateView
 from django.urls import reverse, reverse_lazy
+from django.utils import timezone
 from board.forms import PostForm, ReplyForm, ReportForm
-from board.models import Ban, Post, Board, Report
+from board.models import Post, Board, Report
 from board.utils import get_client_ip, get_ip_bans
 
 __all__ = ("BannedView", "BoardView", "PostView", "ReportView")
@@ -19,8 +19,13 @@ class BannedView(TemplateView):
         context = super(TemplateView, self).get_context_data(**kwargs)
         ip = get_client_ip(self.request)
         bans = get_ip_bans(ip)
+
+        now = timezone.now()
+        active_bans = [ban for ban in bans if ban.expires > now]
         context["bans"] = bans
+        context["active_bans"] = active_bans
         context["ip"] = ip
+
         return context
 
 
@@ -52,14 +57,22 @@ class CreatePostView(CreateView):
 
     def dispatch(self, request, *args, **kwargs):
         self._set_board(kwargs["url"])
-        if request.method == "POST":
-            ip = get_client_ip(request)
-            bans = [
-                ban
-                for ban in get_ip_bans(ip)
-                if ban.board == self.board or not ban.board
-            ]
-            if bans:
+        ip = get_client_ip(request)
+        # Filter bans by board first
+        bans = [
+            ban for ban in get_ip_bans(ip) if ban.board == self.board or not ban.board
+        ]
+        if bans:
+            # Check if any bans are expired
+            now = timezone.now()
+            active = [ban for ban in bans if ban.expires > now]
+            expired = [ban for ban in bans if ban.expires <= now]
+            # Delete expired bans
+            for ban in expired:
+                ban.delete()
+            # If there are any active bans, and someone is trying to create
+            # something with a POST request, stop and redirect
+            if request.method == "POST" and active:
                 return HttpResponseRedirect(reverse("board:banned"))
 
         return super(CreatePostView, self).dispatch(request, *args, **kwargs)