demo: configure wasm-demo for mainnet and add bun dev server

Point the bootnode at /dnsaddr/mainnet.ethswarm.org (resolved in-browser via
DoH), set network-id=1/--mainnet=true, fresh data-dir. Add serve.js (Bun
static server with application/wasm MIME and root SW scope).

Author: v1rtl

wasm-demo/serve.js

@@ -0,0 +1,44 @@
+import { file } from "bun";
+import { extname, join, normalize } from "path";
+
+const ROOT = import.meta.dir;
+const PORT = Number(process.env.PORT ?? 8080);
+
+const MIME = {
+  ".html": "text/html; charset=utf-8",
+  ".js": "text/javascript; charset=utf-8",
+  ".mjs": "text/javascript; charset=utf-8",
+  ".css": "text/css; charset=utf-8",
+  ".json": "application/json; charset=utf-8",
+  ".wasm": "application/wasm",
+  ".map": "application/json",
+};
+
+Bun.serve({
+  port: PORT,
+  idleTimeout: 0,
+  async fetch(req) {
+    let { pathname } = new URL(req.url);
+    if (pathname === "/") pathname = "/index.html";
+
+    // Resolve within ROOT and guard against path traversal.
+    const safe = normalize(pathname).replace(/^(\.\.(\/|\\|$))+/, "");
+    const path = join(ROOT, safe);
+    const f = file(path);
+    if (!(await f.exists())) {
+      return new Response("Not found", { status: 404 });
+    }
+
+    const type = MIME[extname(path).toLowerCase()] || "application/octet-stream";
+    return new Response(f, {
+      headers: {
+        "Content-Type": type,
+        // Allow the service worker (served at /sw_bundle.js) to claim root scope.
+        "Service-Worker-Allowed": "/",
+        "Cache-Control": "no-cache",
+      },
+    });
+  },
+});
+
+console.log(`bee wasm demo: http://localhost:${PORT}`);

wasm-demo/sw.js

@@ -108,16 +108,19 @@ async function main() {
     "start",
     "--password",
     "testing",
+    // Mainnet bootnodes. The dnsaddr is resolved in-browser via DoH
+    // (pkg/p2p/discover_js.go), yielding the libp2p.direct AutoTLS secure
+    // WebSocket addresses that the wasmws transport can dial.
     "--bootnode",
-    "/ip4/49.12.172.37/tcp/32510/tls/sni/49-12-172-37.k2k4r8mh36hk5mcrg2syh2amdbl4dmd08fjhtqrtvyn0gef71auumrvf.libp2p.direct/ws/p2p/QmWbXocGMpfa8zApx9kCNwfmc35bbRJv136bdtuQjbR4wL",
+    "/dnsaddr/mainnet.ethswarm.org",
     "--data-dir",
-    "/home/user/.bee/sepolia",
+    "/home/user/.bee/mainnet",
     "--verbosity",
     "debug",
     // '--blockchain-rpc-endpoint',
-    // 'https://ethereum-sepolia-rpc.publicnode.com/ac5b7f52aabd778861c2588f872f15c5fc34f0b343ec3d18ac2e91f5526e9c2b',
-    "--mainnet=false",
-    "--network-id=5",
+    // 'https://rpc.gnosischain.com',
+    "--mainnet=true",
+    "--network-id=1",
     "--p2p-ws-enable",
   ];