feat: add thread_create_spam automod trigger (#273)

backend/src/plugins/Automod/constants.ts

@@ -16,4 +16,5 @@ export enum RecentActionType {
   MemberJoin,
   Sticker,
   MemberLeave,
+  ThreadCreate,
 }

backend/src/plugins/Automod/events/runAutomodOnThreadEvents.ts

@@ -1,4 +1,5 @@
 import { typedGuildEventListener } from "knub";
+import { RecentActionType } from "../constants";
 import { runAutomod } from "../functions/runAutomod";
 import { AutomodContext, AutomodPluginType } from "../types";
 
@@ -19,6 +20,13 @@ export const RunAutomodOnThreadCreate = typedGuildEventListener<AutomodPluginTyp
     };
 
     pluginData.state.queue.add(() => {
+      pluginData.state.recentActions.push({
+        type: RecentActionType.ThreadCreate,
+        context,
+        count: 1,
+        identifier: null,
+      });
+
       runAutomod(pluginData, context);
     });
   },

backend/src/plugins/Automod/triggers/availableTriggers.ts

@@ -27,6 +27,7 @@ import { RoleAddedTrigger } from "./roleAdded";
 import { RoleRemovedTrigger } from "./roleRemoved";
 import { StickerSpamTrigger } from "./stickerSpam";
 import { ThreadCreateTrigger } from "./threadCreate";
+import { ThreadCreateSpamTrigger } from "./threadCreateSpam";
 import { ThreadDeleteTrigger } from "./threadDelete";
 import { UnbanTrigger } from "./unban";
 import { UnmuteTrigger } from "./unmute";
@@ -54,6 +55,7 @@ export const availableTriggers: Record<string, AutomodTriggerBlueprint<any, any>
   character_spam: CharacterSpamTrigger,
   member_join_spam: MemberJoinSpamTrigger,
   sticker_spam: StickerSpamTrigger,
+  thread_create_spam: ThreadCreateSpamTrigger,
 
   counter_trigger: CounterTrigger,
 
@@ -94,6 +96,7 @@ export const AvailableTriggers = t.type({
   character_spam: CharacterSpamTrigger.configType,
   member_join_spam: MemberJoinSpamTrigger.configType,
   sticker_spam: StickerSpamTrigger.configType,
+  thread_create_spam: ThreadCreateSpamTrigger.configType,
 
   counter_trigger: CounterTrigger.configType,
 

backend/src/plugins/Automod/triggers/threadCreateSpam.ts

@@ -0,0 +1,51 @@
+import * as t from "io-ts";
+import { convertDelayStringToMS, tDelayString } from "../../../utils";
+import { RecentActionType } from "../constants";
+import { findRecentSpam } from "../functions/findRecentSpam";
+import { getMatchingRecentActions } from "../functions/getMatchingRecentActions";
+import { sumRecentActionCounts } from "../functions/sumRecentActionCounts";
+import { automodTrigger } from "../helpers";
+
+export const ThreadCreateSpamTrigger = automodTrigger<unknown>()({
+  configType: t.type({
+    amount: t.number,
+    within: tDelayString,
+  }),
+
+  defaultConfig: {},
+
+  async match({ pluginData, context, triggerConfig }) {
+    if (!context.threadChange?.created) {
+      return;
+    }
+
+    const recentSpam = findRecentSpam(pluginData, RecentActionType.ThreadCreate);
+    if (recentSpam) {
+      context.actioned = true;
+      return {};
+    }
+
+    const since = Date.now() - convertDelayStringToMS(triggerConfig.within)!;
+    const matchingActions = getMatchingRecentActions(pluginData, RecentActionType.ThreadCreate, null, since);
+    const totalCount = sumRecentActionCounts(matchingActions);
+
+    if (totalCount >= triggerConfig.amount) {
+      const extraContexts = matchingActions.map(a => a.context).filter(c => c !== context);
+
+      pluginData.state.recentSpam.push({
+        type: RecentActionType.ThreadCreate,
+        timestamp: Date.now(),
+        archiveId: null,
+        identifiers: [],
+      });
+
+      return {
+        extraContexts,
+      };
+    }
+  },
+
+  renderMatchInformation({ pluginData, contexts, triggerConfig }) {
+    return "";
+  },
+});