Implement default avatars

src/cdn/routes/embed.ts

@@ -0,0 +1,56 @@
+/*
+	Fosscord: A FOSS re-implementation and extension of the Discord.com backend.
+	Copyright (C) 2023 Fosscord and Fosscord 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 { Request, Response, Router } from "express";
+import FileType from "file-type";
+import fs from "fs";
+import { HTTPError } from "lambert-server";
+import { join } from "path";
+
+const router = Router();
+
+function getFile(path: string) {
+	try {
+		return fs.readFileSync(path);
+	} catch (error) {
+		try {
+			const files = fs.readdirSync(path);
+			if (!files.length) return null;
+			return fs.readFileSync(join(path, files[0]));
+		} catch (error) {
+			return null;
+		}
+	}
+}
+
+router.get("/avatars/:id", async (req: Request, res: Response) => {
+	let { id } = req.params;
+	id = id.split(".")[0]; // remove .file extension
+	const path = join(process.cwd(), "assets", "default-avatars", `${id}.png`);
+
+	const file = getFile(path);
+	if (!file) throw new HTTPError("not found", 404);
+	const type = await FileType.fromBuffer(file);
+
+	res.set("Content-Type", type?.mime);
+	res.set("Cache-Control", "public, max-age=31536000");
+
+	return res.send(file);
+});
+
+export default router;