Bring back snekbox result filtering

With the new system, some custom actions might be applied if any filters are triggered, for example message deletion or infraction.
Those actions will be applied in the context of the command invocation.

2 files changed, 20 insertions, 2 deletions

diff --git a/bot/exts/filtering/_filter_lists/antispam.py b/bot/exts/filtering/_filter_lists/antispam.py
index cf5875723..41eda9878 100644
--- a/bot/exts/filtering/_filter_lists/antispam.py
+++ b/bot/exts/filtering/_filter_lists/antispam.py
@@ -59,7 +59,7 @@ class AntispamList(UniquesListBase):
         self, ctx: FilterContext
     ) -> tuple[ActionSettings | None, list[str], dict[ListType, list[Filter]]]:
         """Dispatch the given event to the list's filters, and return actions to take and messages to relay to mods."""
-        if not ctx.message:
+        if not ctx.message or not ctx.message_cache:
             return None, [], {}
 
         sublist: SubscribingAtomicList = self[ListType.DENY]
diff --git a/bot/exts/filtering/filtering.py b/bot/exts/filtering/filtering.py
index 65089a6d5..81348ca1e 100644
--- a/bot/exts/filtering/filtering.py
+++ b/bot/exts/filtering/filtering.py
@@ -196,7 +196,7 @@ class Filtering(Cog):
         return await has_any_role(*MODERATION_ROLES).predicate(ctx)
 
     # endregion
-    # region: listeners
+    # region: listeners and event handlers
 
     @Cog.listener()
     async def on_message(self, msg: Message) -> None:
@@ -247,6 +247,24 @@ class Filtering(Cog):
         ctx = FilterContext(Event.NICKNAME, member, None, member.display_name, None)
         await self._check_bad_name(ctx)
 
+    async def filter_snekbox_output(self, snekbox_result: str, msg: Message) -> bool:
+        """
+        Filter the result of a snekbox command to see if it violates any of our rules, and then respond accordingly.
+
+        Also requires the original message, to check whether to filter and for alerting.
+        Any action (deletion, infraction) will be applied in the context of the original message.
+
+        Returns whether a filter was triggered or not.
+        """
+        ctx = FilterContext.from_message(Event.MESSAGE, msg).replace(content=snekbox_result)
+        result_actions, list_messages, triggers = await self._resolve_action(ctx)
+        if result_actions:
+            await result_actions.action(ctx)
+        if ctx.send_alert:
+            await self._send_alert(ctx, list_messages)
+
+        return result_actions is not None
+
     # endregion
     # region: blacklist commands