Static server that mimics GitHub Pages.

gh_server.js

// Static server that mimics GitHub Pages.

import chalk from 'chalk';
import express from 'express';
import * as fs from 'fs';
import http from 'http';
import path from 'path';
import {fileURLToPath} from 'url';

const __dirname = path.dirname(fileURLToPath(import.meta.url));

const SERVE_ROOT = path.join(__dirname);
const ERROR_PAGE_PATH = '404.html';
const PORT_NUMBER = 8080;

function logRequest(req) {
  const timeStr = new Date().toLocaleTimeString('en-US', {hour12: false});
  console.log(`[${timeStr}] ${req.method} ${req.path}`);
}

function logResponse(resp) {
  const statusOk = resp.statusCode >= 200 && resp.statusCode < 300;
  const statusMessage =
    resp.statusMessage || http.STATUS_CODES[resp.statusCode];
  const style = statusOk ? chalk.green : chalk.red;
  console.log(style(`> ${resp.statusCode} ${statusMessage}`));
}

const app = express();

app.use((req, resp, next) => {
  logRequest(req);

  const requestedFilePath = path.join(SERVE_ROOT, req.path);
  if (fs.existsSync(requestedFilePath)) {
    resp.status(200).sendFile(requestedFilePath);
  } else {
    resp.status(404).sendFile(ERROR_PAGE_PATH, {root: SERVE_ROOT});
  }

  logResponse(resp);
});

app.listen(PORT_NUMBER, () => {
  console.log(chalk.underline(`Server is running at localhost:${PORT_NUMBER}`));
});