Implement signed cdn urls

src/api/routes/attachments/refresh-urls.ts

@@ -0,0 +1,48 @@
+/*
+	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 { RefreshUrlsRequestSchema, resignUrl } from "@spacebar/util";
+import { Request, Response, Router } from "express";
+const router = Router();
+
+router.post(
+	"/",
+	route({
+		requestBody: "RefreshUrlsRequestSchema",
+		responses: {
+			200: {
+				body: "RefreshUrlsResponse",
+			},
+			400: {
+				body: "APIErrorResponse",
+			},
+		},
+	}),
+	async (req: Request, res: Response) => {
+		const { attachment_urls } = req.body as RefreshUrlsRequestSchema;
+
+		const refreshed_urls = attachment_urls.map(resignUrl);
+
+		return res.status(200).json({
+			refreshed_urls,
+		});
+	},
+);
+
+export default router;

src/api/routes/channels/#channel_id/messages/index.ts

@@ -35,6 +35,7 @@ import {
 	emitEvent,
 	getPermission,
 	isTextChannel,
+	resignUrl,
 	uploadFile,
 } from "@spacebar/util";
 import { Request, Response, Router } from "express";
@@ -199,16 +200,18 @@ router.get(
 					? y.proxy_url
 					: `https://example.org${y.proxy_url}`;
 
-				let pathname = new URL(uri).pathname;
-				while (
-					pathname.split("/")[0] != "attachments" &&
-					pathname.length > 30
-				) {
-					pathname = pathname.split("/").slice(1).join("/");
+				const url = new URL(uri);
+				if (endpoint) {
+					const newBase = new URL(endpoint);
+					url.protocol = newBase.protocol;
+					url.hostname = newBase.hostname;
+					url.port = newBase.port;
 				}
-				if (!endpoint?.endsWith("/")) pathname = "/" + pathname;
 
-				y.proxy_url = `${endpoint == null ? "" : endpoint}${pathname}`;
+				y.proxy_url = url.toString();
+
+				y.proxy_url = resignUrl(y.proxy_url);
+				y.url = resignUrl(y.url);
 			});
 
 			/**