/**
 * Everything is crawlable, and the sitemap says where everything is. Absolute,
 * because robots.txt requires it, from whichever domain this is served on.
 */
import { defineEventHandler, getRequestHeaders, setResponseHeader } from 'h3';

import { originFromHeaders } from '../../app/core/origin';

export default defineEventHandler((event) => {
  const origin = originFromHeaders(getRequestHeaders(event)) ?? '';

  setResponseHeader(event, 'Content-Type', 'text/plain; charset=utf-8');

  return [
    'User-agent: *',
    'Allow: /',
    '',
    `Sitemap: ${origin}/sitemap.xml`,
    '',
  ].join('\n');
});