feat: add application command index route for guilds

src/api/routes/guilds/#guild_id/application-command-index.ts

@@ -0,0 +1,39 @@
+/*
+  Spacebar: A FOSS re-implementation and extension of the Discord.com backend.
+  Copyright (C) 2023 Spacebar and Spacebar Contributors
+  
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU Affero 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 Affero General Public License for more details.
+  
+  You should have received a copy of the GNU Affero General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+import { route } from "@spacebar/api";
+import { Request, Response, Router } from "express";
+import { ApplicationCommand, Member, Snowflake } from "@spacebar/util";
+import { IsNull } from "typeorm";
+
+const router = Router({ mergeParams: true });
+
+router.get("/", route({}), async (req: Request, res: Response) => {
+	const applications = await Member.find({ where: { guild_id: req.params.guild_id, user: { bot: true } } });
+
+	const globalApplicationCommands = await ApplicationCommand.find({ where: { application_id: applications[0].id, guild_id: IsNull() } });
+	const guildApplicationCommands = await ApplicationCommand.find({ where: { application_id: applications[0].id, guild_id: req.params.guild_id } });
+
+	res.send({
+		applications,
+		application_commands: [...globalApplicationCommands, ...guildApplicationCommands],
+		version: Snowflake.generate(),
+	});
+});
+
+export default router;