Rename CreatePostView -> CreateView, add utils.is_banned

The artist formerly known as CreatePostView is a little more generic now
and outsources its ban check to a new util method, is_banned.

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

board/utils.py

@@ -1,6 +1,13 @@
-from board.models import Ban, RangeBan
+from typing import TYPE_CHECKING
+from django.utils import timezone
 import ipaddress
 
+from board.models import Ban, RangeBan
+
+
+if TYPE_CHECKING:
+    from board.models import Board
+
 
 def get_client_ip(request):
     "Get the IP address of a client-side request. Shamelessly copy/pasted from StackOverflow."
@@ -24,3 +31,17 @@ def get_ip_bans(ip: str) -> list:
         if start <= ip_addr <= end:  # type: ignore
             bans += [rangeban]
     return bans
+
+
+def is_banned(ip: str, board: "Board" | None) -> bool:
+    now = timezone.now()
+    bans = [ban for ban in get_ip_bans(ip) if ban.board == board or not ban.board]
+    if bans:
+        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()
+        return bool(active)
+    else:
+        return False

board/views.py

@@ -1,16 +1,17 @@
 from typing import Any, Dict
 from django.conf import settings
 from django.contrib.auth.mixins import PermissionRequiredMixin
+from django.core.exceptions import ImproperlyConfigured
 from django.db.models import Q
 from django.http import Http404, HttpResponseRedirect
 from django.shortcuts import get_object_or_404
 from django.views.generic.base import TemplateView
-from django.views.generic.edit import CreateView
+from django.views.generic import edit
 from django.urls import reverse, reverse_lazy
 from django.utils import timezone
 from board.forms import BanForm, PostForm, ReplyForm, ReportForm
 from board.models import Ban, BanTemplate, Board, Post, Report
-from board.utils import get_client_ip, get_ip_bans
+from board.utils import *
 
 __all__ = (
     "BanCreateView",
@@ -40,16 +41,17 @@ class BannedView(TemplateView):
         return context
 
 
-class CreatePostView(CreateView):
+class CreateView(edit.CreateView):
     """
-    Helper class that sets a few variables for posts. This should not be used by itself.
+    Helper class that sets a few variables for posts and check against bans.
+    This should not be used by itself.
 
     This class sets the following variables on GET and POST:
     * self.board
     """
 
     def get_form_kwargs(self):
-        kwargs = super(CreatePostView, self).get_form_kwargs()
+        kwargs = super(CreateView, self).get_form_kwargs()
         kwargs["board"] = self.board
         kwargs["ip"] = get_client_ip(self.request)
         return kwargs
@@ -58,28 +60,15 @@ class CreatePostView(CreateView):
         # Set the board on this object
         self.board = get_object_or_404(Board, url=kwargs["url"])
 
+        # Check for 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)
+        if request.method == "POST" and is_banned(ip, self.board):
+            return HttpResponseRedirect(reverse("board:banned"))
+        else:
+            return super(CreateView, self).dispatch(request, *args, **kwargs)
 
 
-class BoardView(CreatePostView):
+class BoardView(CreateView):
     model = Post
     form_class = PostForm
     slug_field = "url"
@@ -116,7 +105,7 @@ class BoardView(CreatePostView):
         return super(BoardView, self).get_context_data(**kwargs)
 
 
-class PostView(CreatePostView):
+class PostView(CreateView):
     model = Post
     form_class = ReplyForm
     slug_field = "url"
@@ -141,7 +130,7 @@ class PostView(CreatePostView):
         return kwargs
 
 
-class ReportView(CreatePostView):
+class ReportView(CreateView):
     model = Report
     form_class = ReportForm
     success_url = reverse_lazy("board:report_success")