index.js

const {
  requestURL,
  requestUserAgent,
  isBehindProxy,
  rateLimitWindowDurationMinutes,
  rateLimitWindowMax,
  serverlistQueryIntervalSeconds,
  listenPort,
  uniqueUUID,
} = require("../config/config.json");

const fs = require("fs");
const app = require("express")();
const cors = require("cors");
const rateLimit = require("express-rate-limit");
const limiter = rateLimit({
  windowMs: rateLimitWindowDurationMinutes * 60 * 1000,
  max: rateLimitWindowMax,
});
const axios = require("axios").default;
const port = process.env.PORT || listenPort;

if (
  uniqueUUID.match(
    "[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}"
  ) == null
) {
  console.error(
    "Something is wrong with the UUID:( https://www.regextester.com/99148"
  );
  process.exit(0);
}

const routes = require("./routes/");

app.use("/api", routes);
app.use(limiter);
app.use(cors);

if (isBehindProxy) {
  app.set("trust proxy", 1);
  console.log("Trust proxy enabled (this means you are using a proxy)");
}

app.listen(port, () => {
  getInfo();
  setInterval(getInfo, serverlistQueryIntervalSeconds * 1000);
  console.log(`Listening on port ${port}`);
});

function getInfo() {
  axios
    .get(requestURL, { headers: { "User-Agent": requestUserAgent } })
    .then((resp) => {
      fs.writeFileSync(
        "./storage/raw.json",
        JSON.stringify(resp.data, null, 2)
      );
    })
    .catch((err) => {
      console.error(err);
    });
  axios
    .get("https://static.ren-x.com/launcher_data/version/release.json")
    .then((resp) => {
      fs.writeFileSync(
        "./storage/version.json",
        JSON.stringify(resp.data, null, 2)
      );
    })
    .catch((err) => {
      console.error(err);
    });
}