feat: add thread_create and thread_delete automod triggers (#272)

Co-authored-by: metal <admin@metalruller.com>

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

@@ -0,0 +1,48 @@
+import { Snowflake } from "discord-api-types";
+import { User, Util } from "discord.js";
+import * as t from "io-ts";
+import { automodTrigger } from "../helpers";
+
+interface ThreadCreateResult {
+  matchedThreadId: Snowflake;
+  matchedThreadName: string;
+  matchedThreadParentId: Snowflake;
+  matchedThreadParentName: string;
+  matchedThreadOwner: User | undefined;
+}
+
+export const ThreadCreateTrigger = automodTrigger<ThreadCreateResult>()({
+  configType: t.type({}),
+  defaultConfig: {},
+
+  async match({ context }) {
+    if (!context.threadChange?.created) {
+      return;
+    }
+
+    const thread = context.threadChange.created;
+
+    return {
+      extra: {
+        matchedThreadId: thread.id,
+        matchedThreadName: thread.name,
+        matchedThreadParentId: thread.parentId ?? "Unknown",
+        matchedThreadParentName: thread.parent?.name ?? "Unknown",
+        matchedThreadOwner: context.user,
+      },
+    };
+  },
+
+  async renderMatchInformation({ matchResult }) {
+    const threadId = matchResult.extra.matchedThreadId;
+    const threadName = matchResult.extra.matchedThreadName;
+    const threadOwner = matchResult.extra.matchedThreadOwner;
+    const parentId = matchResult.extra.matchedThreadParentId;
+    const parentName = matchResult.extra.matchedThreadParentName;
+    const base = `Thread **#${threadName}** (\`${threadId}\`) has been created in the **#${parentName}** (\`${parentId}\`) channel`;
+    if (threadOwner) {
+      return `${base} by **${Util.escapeBold(threadOwner.tag)}** (\`${threadOwner.id}\`)`;
+    }
+    return base;
+  },
+});