matchURI, using a labeled block

matchURI.mjs

import { URL } from 'url';

const DOMAINS = new Set([ 'example.com', 'alternate.net' ]);
const SEGMENTS = new Set([ 'query', 'search' ]);

export function matchURI(uri) {
  let id = undefined;
  let url;

  try {
    url = new URL(uri);
  }
  catch (err) {
    return { uri, id, reason: 'error' };
  }

  // match against a valid URL
  const { hostname, pathname } = url;
  let reason = 'none';

  // 😮 "you can do that ??!"
  processed: {
    if (! DOMAINS.has(hostname)) {
      break processed;
    }
    reason = 'hostname';

    const pathSegments = pathname.split('/')
    .filter((segment) => (segment !== ''));

    if (pathSegments[0] === 'resource') {
      // "/resource/:id"
      reason = 'pathname';
      id = pathSegments[pathSegments.length - 1];
      break processed;
    }

    if (pathSegments.some((segment) => SEGMENTS.has(segment))) {
      // "/operation/query?id=:id"
      reason = 'param'; //
      id = url.searchParams.get('id');
      break processed;
    }
  }

  return { uri, id, reason };
}