1 files changed, 154 insertions, 0 deletions
diff --git a/src/api/middlewares/TestClient.ts b/src/api/middlewares/TestClient.ts
new file mode 100644
index 00000000..c8ea57f6
--- /dev/null
+++ b/src/api/middlewares/TestClient.ts
@@ -0,0 +1,154 @@
+import express, { Request, Response, Application } from "express";
+import fs from "fs";
+import path from "path";
+import fetch, { Response as FetchResponse, Headers } from "node-fetch";
+import ProxyAgent from 'proxy-agent';
+import { Config } from "@fosscord/util";
+import { AssetCacheItem } from "../util/entities/AssetCacheItem"
+import { green } from "picocolors";
+
+const AssetsPath = path.join(__dirname, "..", "..", "..", "assets")
+
+export default function TestClient(app: Application) {
+	const agent = new ProxyAgent();
+	
+	//build client page
+	let html = fs.readFileSync(path.join(AssetsPath, "index.html"), { encoding: "utf8" });
+	html = applyEnv(html);
+	html = applyInlinePlugins(html);
+	html = applyPlugins(html);
+	html = applyPreloadPlugins(html);
+
+	//load asset cache
+	let newAssetCache: Map<string, AssetCacheItem> = new Map<string, AssetCacheItem>();
+	let assetCacheDir = path.join(AssetsPath, "cache");
+	if(process.env.ASSET_CACHE_DIR)
+		assetCacheDir = process.env.ASSET_CACHE_DIR
+
+	console.log(`[TestClient] ${green(`Using asset cache path: ${assetCacheDir}`)}`)
+	if(!fs.existsSync(assetCacheDir)) {
+		fs.mkdirSync(assetCacheDir);
+	}
+	if(fs.existsSync(path.join(assetCacheDir, "index.json"))) {
+		let rawdata = fs.readFileSync(path.join(assetCacheDir, "index.json"));
+		newAssetCache = new Map<string, AssetCacheItem>(Object.entries(JSON.parse(rawdata.toString())));
+	}
+
+	app.use("/assets", express.static(path.join(AssetsPath)));	
+	app.get("/assets/:file", async (req: Request, res: Response) => {
+		delete req.headers.host;
+		let response: FetchResponse;
+		let buffer: Buffer;
+		let assetCacheItem: AssetCacheItem = new AssetCacheItem(req.params.file);
+		if(newAssetCache.has(req.params.file)){
+			assetCacheItem = newAssetCache.get(req.params.file)!;
+			assetCacheItem.Headers.forEach((value: any, name: any) => {
+				res.set(name, value);
+			});
+		}
+		else {
+			console.log(`[TestClient] Downloading file not yet cached! Asset file: ${req.params.file}`);
+			response = await fetch(`https://discord.com/assets/${req.params.file}`, {
+				agent,
+				// @ts-ignore
+				headers: {
+					...req.headers
+				}
+			});
+			
+			//set cache info
+			assetCacheItem.Headers = Object.fromEntries(stripHeaders(response.headers));
+			assetCacheItem.FilePath = path.join(assetCacheDir, req.params.file);
+			assetCacheItem.Key = req.params.file;
+			//add to cache and save
+			newAssetCache.set(req.params.file, assetCacheItem);
+			fs.writeFileSync(path.join(assetCacheDir, "index.json"), JSON.stringify(Object.fromEntries(newAssetCache), null, 4));
+			//download file
+			fs.writeFileSync(assetCacheItem.FilePath, await response.buffer());
+		}
+		
+		assetCacheItem.Headers.forEach((value: string, name: string) => {
+			res.set(name, value);
+		});
+		return res.send(fs.readFileSync(assetCacheItem.FilePath));
+	});
+	app.get("/developers*", (_req: Request, res: Response) => {
+		const { useTestClient } = Config.get().client;
+		res.set("Cache-Control", "public, max-age=" + 60 * 60 * 24);
+		res.set("content-type", "text/html");
+
+		if(!useTestClient) return res.send("Test client is disabled on this instance. Use a stand-alone client to connect this instance.")
+		
+		res.send(fs.readFileSync(path.join(__dirname, "..", "..", "..", "assets", "developers.html"), { encoding: "utf8" }));
+	});
+	app.get("*", (req: Request, res: Response) => {
+		const { useTestClient } = Config.get().client;
+		res.set("Cache-Control", "public, max-age=" + 60 * 60 * 24);
+		res.set("content-type", "text/html");
+
+		if(req.url.startsWith("/api") || req.url.startsWith("/__development")) return;
+
+		if(!useTestClient) return res.send("Test client is disabled on this instance. Use a stand-alone client to connect this instance.")
+		if (req.url.startsWith("/invite")) return res.send(html.replace("9b2b7f0632acd0c5e781", "9f24f709a3de09b67c49"));
+		
+		res.send(html);
+	});
+
+	
+}
+
+function applyEnv(html: string): string {
+	const CDN_ENDPOINT = (Config.get().cdn.endpointClient || Config.get()?.cdn.endpointPublic || process.env.CDN || "").replace(
+		/(https?)?(:\/\/?)/g,
+		""
+	);
+	const GATEWAY_ENDPOINT = Config.get().gateway.endpointClient || Config.get()?.gateway.endpointPublic || process.env.GATEWAY || "";
+
+	if (CDN_ENDPOINT) {
+		html = html.replace(/CDN_HOST: .+/, `CDN_HOST: \`${CDN_ENDPOINT}\`,`);
+	}
+	if (GATEWAY_ENDPOINT) {
+		html = html.replace(/GATEWAY_ENDPOINT: .+/, `GATEWAY_ENDPOINT: \`${GATEWAY_ENDPOINT}\`,`);
+	}
+	return html;
+}
+
+function applyPlugins(html: string): string {
+	// plugins
+	let files = fs.readdirSync(path.join(AssetsPath, "plugins"));
+	let plugins = "";
+	files.forEach(x =>{if(x.endsWith(".js")) plugins += `<script src='/assets/plugins/${x}'></script>\n`; });
+	return html.replaceAll("<!-- plugin marker -->", plugins);
+}
+
+function applyInlinePlugins(html: string): string{
+	// inline plugins
+	let files = fs.readdirSync(path.join(AssetsPath, "inline-plugins"));
+	let plugins = "";
+	files.forEach(x =>{if(x.endsWith(".js")) plugins += `<script src='/assets/inline-plugins/${x}'></script>\n\n`; });
+	return html.replaceAll("<!-- inline plugin marker -->", plugins);
+}
+
+function applyPreloadPlugins(html: string): string{
+	//preload plugins
+	let files = fs.readdirSync(path.join(AssetsPath, "preload-plugins"));
+	let plugins = "";
+	files.forEach(x =>{if(x.endsWith(".js")) plugins += `<script>${fs.readFileSync(path.join(AssetsPath, "preload-plugins", x))}</script>\n`; });
+	return html.replaceAll("<!-- preload plugin marker -->", plugins);
+}
+
+function stripHeaders(headers: Headers): Headers {
+	[
+		"content-length",
+		"content-security-policy",
+		"strict-transport-security",
+		"set-cookie",
+		"transfer-encoding",
+		"expect-ct",
+		"access-control-allow-origin",
+		"content-encoding"
+	].forEach(headerName => {
+		headers.delete(headerName);
+	});
+	return headers;
+}