feat: initial prototype

src/events/handleMessage.ts

@@ -0,0 +1,48 @@
+/**
+ * @copyright NHCarrigan
+ * @license Naomi's Public License
+ * @author Naomi Carrigan
+ */
+
+import type { Umbrelle } from "../interfaces/umbrelle.js";
+import type { Message } from "discord.js";
+
+/**
+ * Fetches the configured honeypot channels from the database
+ * and attaches them to Umbrelle's cache.
+ * @param umbrelle - Umbrelle's instance.
+ * @param message - The message payload from Discord.
+ */
+export const handleMessage = async(
+  umbrelle: Umbrelle,
+  message: Message,
+): Promise<void> => {
+  if (!message.inGuild()) {
+    return;
+  }
+  const { author, member, guild, channel } = message;
+
+  const cached = umbrelle.cache.get(guild.id);
+  if (cached !== channel.id) {
+    return;
+  }
+  const resolvedMember = member
+    ?? guild.members.cache.get(author.id)
+    ?? await guild.members.fetch(author.id).catch(() => {
+      return null;
+    });
+  if (!resolvedMember) {
+    return;
+  }
+  await author.send({
+    content: `Your account appears to have been compromised. As a security measure, you have been removed from the ${guild.name} community.
+
+You are not banned, however, and may rejoin at any time after you recover your account.`,
+  });
+  await resolvedMember.ban({
+    deleteMessageSeconds: 24 * 60 * 60 * 1000,
+    reason:               "Soft ban for a compromised account.",
+  });
+  await guild.bans.remove(resolvedMember.id,
+    "Soft ban for a compromised account.");
+};