initial

backend/src/plugins/Automod/actions/availableActions.ts

@@ -7,6 +7,7 @@ import { ArchiveThreadAction } from "./archiveThread";
 import { BanAction } from "./ban";
 import { ChangeNicknameAction } from "./changeNickname";
 import { CleanAction } from "./clean";
+import { CrosspostMessageAction } from "./crosspostMessage";
 import { KickAction } from "./kick";
 import { LogAction } from "./log";
 import { MuteAction } from "./mute";
@@ -34,6 +35,7 @@ export const availableActions: Record<string, AutomodActionBlueprint<any>> = {
   set_counter: SetCounterAction,
   set_slowmode: SetSlowmodeAction,
   archive_thread: ArchiveThreadAction,
+  crosspost_message: CrosspostMessageAction,
 };
 
 export const AvailableActions = t.type({
@@ -53,4 +55,5 @@ export const AvailableActions = t.type({
   set_counter: SetCounterAction.configType,
   set_slowmode: SetSlowmodeAction.configType,
   archive_thread: ArchiveThreadAction.configType,
+  crosspost_message: CrosspostMessageAction.configType,
 });

backend/src/plugins/Automod/actions/crosspostMessage.ts

@@ -0,0 +1,29 @@
+import { Message } from "discord.js";
+import * as t from "io-ts";
+import { ChannelTypeStrings } from "src/types";
+import { automodAction } from "../helpers";
+
+export const CrosspostMessageAction = automodAction({
+  configType: t.type({}),
+  defaultConfig: {},
+
+  async apply({ pluginData, contexts, actionConfig }) {
+    const messages = await Promise.all(
+      contexts
+        .filter(c => c.message?.id)
+        .map(async c => {
+          const channel = pluginData.guild.channels.cache.get(c.message!.channel_id);
+          if (channel?.type === ChannelTypeStrings.NEWS && channel.isText()) {
+            // .isText() to fix the typings
+            const msg = await channel.messages.fetch(c.message!.id);
+            return msg && msg.crosspostable ? msg : null;
+          }
+          return null;
+        }),
+    );
+
+    for (const msg of messages) {
+      await msg?.crosspost();
+    }
+  },
+});