Function resolveStaticFilePath

lib/http-server.js:20–42

(urlPath)

const WEB_ROOT = path.resolve(__dirname, '..', 'web');

function resolveStaticFilePath(urlPath) {
  let decodedPath;
  try {
    decodedPath = decodeURIComponent(urlPath || '/');
  } catch {
    return null;
  }

  const relativePath = decodedPath === '/'
    ? 'index.html'
    : decodedPath.replace(/^\/+/, '');
  const filePath = path.resolve(WEB_ROOT, relativePath);
  const relativeToRoot = path.relative(WEB_ROOT, filePath);

  if (
    relativeToRoot.startsWith('..') ||
    path.isAbsolute(relativeToRoot)
  ) {
    return null;
  }

  return filePath;
}

function createHttpServer() {
  return http.createServer((req, res) => {