mnml node server

server.js

const fs = require("fs");
const util = require("util");
const http = require("http");
const path = require("path");
const stat = util.promisify(fs.stat);

const port = 8080;
const rootDir = path.join(__dirname, "public");

const mimeTypes = {
  ".css": "text/css",
  ".gif": "image/gif",
  ".html": "text/html",
  ".js": "application/javascript",
  ".json": "application/json",
  ".png": "image/png",
  ".woff": "font/woff",
  ".woff2": "font/woff2"
};

// static request listener
async function static(req, res) {
  res.on("finish", () => {
    console.log(res.statusCode, req.url);
  });
  try {
    let filePath = path.join(rootDir, req.url);
    let stats = await stat(filePath);

    if (stats.isDirectory()) {
      filePath = path.join(rootDir, req.url, "index.html");
      stats = await stat(filePath);
    }

    const modified = new Date(stats.mtime);
    const etag = `${stats.ino}-${stats.size}-${modified.getTime()}`;

    // conditional requests
    if (
      (req.headers["if-modified-since"] &&
        new Date(req.headers["if-modified-since"]) >= modified) ||
      (req.headers["if-none-match"] && req.headers["if-none-match"] === etag)
    ) {
      res.writeHead(304);
      res.end();
      return;
    }

    const headers = {
      "cache-control": "no-cache",
      "content-length": stats.size,
      "content-type": mimeTypes[path.extname(filePath)] || "text/plain",
      etag,
      "last-modified": modified.toUTCString()
    };

    res.writeHead(200, headers);
    fs.createReadStream(filePath).pipe(res);
  } catch (err) {
    if (err.code === "ENOENT") {
      res.writeHead(404);
      res.end("404 Not Found!");
    } else {
      throw err;
    }
  }
}

// add routes here
async function router(req, res) {
  try {
    /*
      if you want to serve everything but js files from /index.html
      useful when the routing is on the front end (aka spa)!
    */
    // if (!req.url.endsWith("js")) {
    //   req.url = "/";
    // }

    static(req, res);
  } catch (err) {
    console.error(err);
    res.writeHead(500);
    res.end("500 Internal Server Error!");
  }
}

http.createServer(router).listen(port, () => {
  console.log("Port:", port);
});