server.mjs

import { createReadStream } from "node:fs";
import { stat } from "node:fs/promises";
import { createServer } from "node:http";
import { extname, join, normalize } from "node:path";

const port = Number(process.env.PORT || process.argv[2] || 8000);
const root = process.cwd();
const types = { ".html": "text/html", ".mjs": "text/javascript", ".md": "text/markdown" };

createServer(async (request, response) => {
	const pathname = new URL(request.url || "/", "http://fixture.local").pathname;
	const relative = pathname === "/" ? "index.html" : normalize(pathname).replace(/^[/\\]+/, "");
	const target = join(root, relative);
	if (!target.startsWith(root)) return response.writeHead(403).end("Forbidden");
	try {
		const info = await stat(target);
		if (!info.isFile()) throw new Error("not a file");
		response.writeHead(200, { "Content-Type": types[extname(target)] || "application/octet-stream" });
		createReadStream(target).pipe(response);
	} catch {
		response.writeHead(404).end("Not found");
	}
}).listen(port, "0.0.0.0", () => console.log(`fixture ready on ${port}`));