/**
* Audience router for nomadro.com
* - Chinese users → Next.js :4003
* - English users / bots / default → WordPress :8088
*
* Detection mirrors is-china-user primary signals (language + timezone),
* evaluated in a same-origin sniff page (no external CDN).
*/
import http from "node:http";
import httpProxy from "http-proxy";
const PORT = Number(process.env.PORT || 4403);
const NEXT = process.env.NEXT_UPSTREAM || "http://127.0.0.1:4003";
const WP = process.env.WP_UPSTREAM || "http://127.0.0.1:8088";
const COOKIE = "nomadro_route";
const COOKIE_MAX_AGE = 60 * 60 * 24 * 30;
const proxy = httpProxy.createProxyServer({
xfwd: true,
changeOrigin: false,
});
proxy.on("error", (err, _req, res) => {
console.error("proxy error", err.message);
if (res && !res.headersSent && typeof res.writeHead === "function") {
res.writeHead(502, { "Content-Type": "text/plain; charset=utf-8" });
res.end("Bad gateway");
}
});
const BOT_RE =
/Googlebot|AdsBot-Google|Mediapartners-Google|Google-InspectionTool|bingbot|BingPreview|DuckDuckBot|Baiduspider|YandexBot|Slurp|facebookexternalhit|Twitterbot|LinkedInBot|Applebot|SemrushBot|AhrefsBot|DotBot|PetalBot|Bytespider/i;
const WP_PATH_RE =
/^\/(wp-admin|wp-login\.php|wp-cron\.php|wp-comments-post\.php|xmlrpc\.php|wp-json|wp-content|wp-includes)(\/|$)/i;
function getCookie(req, name) {
const raw = req.headers.cookie || "";
for (const p of raw.split(/;\s*/)) {
const i = p.indexOf("=");
if (i === -1) continue;
if (p.slice(0, i) === name) return decodeURIComponent(p.slice(i + 1));
}
return null;
}
function isBot(req) {
return BOT_RE.test(req.headers["user-agent"] || "");
}
function wantsHtml(req) {
if (req.method !== "GET" && req.method !== "HEAD") return false;
const accept = req.headers.accept || "";
const url = req.url || "/";
const path = url.split("?")[0];
if (path.startsWith("/_next/") || path.startsWith("/wp-")) return false;
if (/\.(js|css|map|png|jpe?g|gif|webp|svg|ico|woff2?|ttf|txt|xml)$/i.test(path)) {
return false;
}
if (!accept || accept === "*/*") return path === "/" || !path.includes(".");
return accept.includes("text/html");
}
function sniffHtml() {
// Inline detection aligned with is-china-user language + timezone signals.
return `
Nomadro
Loading…
`;
}
function resolveTarget(req) {
const url = req.url || "/";
const path = url.split("?")[0];
if (WP_PATH_RE.test(path)) return WP;
if (isBot(req)) return WP;
if (url.includes("noscript=1")) return WP;
const route = getCookie(req, COOKIE);
if (route === "zh") return NEXT;
if (route === "en") return WP;
if (wantsHtml(req)) return "SNIFF";
const lang = String(req.headers["accept-language"] || "").toLowerCase();
if (lang.includes("zh")) return NEXT;
return WP;
}
const server = http.createServer((req, res) => {
const target = resolveTarget(req);
if (target === "SNIFF") {
res.writeHead(200, {
"Content-Type": "text/html; charset=utf-8",
"Cache-Control": "no-store, no-cache, must-revalidate",
});
res.end(sniffHtml());
return;
}
if (!req.headers["x-forwarded-proto"]) {
req.headers["x-forwarded-proto"] = "https";
}
proxy.web(req, res, { target });
});
server.on("upgrade", (req, socket, head) => {
let target = resolveTarget(req);
if (target === "SNIFF") target = WP;
proxy.ws(req, socket, head, { target });
});
server.listen(PORT, "127.0.0.1", () => {
console.log(`nomadro-router 127.0.0.1:${PORT} zh→${NEXT} en→${WP}`);
});