Add auto mod blocked reason message

.env

@@ -7,3 +7,5 @@ MESSAGE_COOLDOWN=3
 SUPPORTER_ROLE=
 DONATOR_ROLE=
 BOOSTER_ROLE=
+
+AUTOMOD_RULE_ID=

src/discord/client.ts

@@ -5,7 +5,7 @@ import { string } from "../util/env";
 log.info("Creating Discord client...");
 
 export const client = new Client({
-	"intents": [GatewayIntentBits.MessageContent, GatewayIntentBits.Guilds, GatewayIntentBits.GuildMessages, GatewayIntentBits.GuildMembers]
+	"intents": [GatewayIntentBits.MessageContent, GatewayIntentBits.Guilds, GatewayIntentBits.GuildMessages, GatewayIntentBits.GuildMembers, GatewayIntentBits.AutoModerationExecution]
 });
 
 const success = !!(await client.login(string("DISCORD_TOKEN")));

src/discord/events/automodMessage.ts

@@ -0,0 +1,60 @@
+import type { Channel, User } from "discord.js";
+import { Events } from "discord.js";
+import { sleep } from "bun";
+import { client } from "../client";
+import { string } from "../../util/env";
+import { log } from "../../log";
+
+const ruleId = string("AUTOMOD_RULE_ID");
+const blockedReason = "To prevent spam, links are blocked until you're verified! You'll be verified in a few messages :)";
+
+function getReason(user?: User) {
+	let reason = blockedReason;
+
+	if (user) {
+		reason = `<@${user.id}>, ${reason}`;
+	}
+
+	return reason;
+}
+
+async function sendMessage(channel: Channel | null, reason: string) {
+	if (!channel || !("send" in channel)) {
+		return;
+	}
+
+	log.debug("Sending blocked reason channel message...");
+	const message = await channel.send(reason);
+
+	await sleep(7000);
+	message.delete();
+}
+
+client.on(Events.AutoModerationActionExecution, async (action) => {
+	if (action.ruleId !== ruleId || action.alertSystemMessageId) {
+		return;
+	}
+
+	log.debug(`Detected auto moderation action for user ${action.userId}...`);
+
+	if (!action.user) {
+		log.debug("User is not defined.");
+
+		await sendMessage(action.channel, blockedReason);
+		return;
+	}
+
+	let success: boolean;
+	try {
+		await action.user.send(blockedReason);
+		success = true;
+
+		log.debug("Sent blocked reason in DM!");
+	} catch {
+		success = false;
+	}
+
+	if (!success) {
+		await sendMessage(action.channel, getReason(action.user));
+	}
+});