feat(arabot): add check on join if user is banned

src/listeners/ban.ts

@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+/*
+    Animal Rights Advocates Discord Bot
+    Copyright (C) 2022  Anthony Berg
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+import { Listener } from '@sapphire/framework';
+import type { GuildMember } from 'discord.js';
+import { checkActive, getReason } from '../utils/database/ban';
+
+class BanJoin extends Listener {
+  public constructor(context: Listener.Context, options: Listener.Options) {
+    super(context, {
+      ...options,
+      once: true,
+      event: 'guildMemberAdd',
+    });
+  }
+
+  public async run(user: GuildMember) {
+    // Check if the user is banned
+    if (!await checkActive(user.id)) {
+      return;
+    }
+
+    // Get reason from database
+    const reason = await getReason(user.id);
+
+    // Send DM for ban reason
+    await user.send(`You have been banned from ARA for: ${reason}`
+      + '\n\nhttps://vbcamp.org/ARA')
+      .catch();
+
+    // Ban the user
+    await user.ban({ reason });
+  }
+}
+
+export default BanJoin;