Function rewrite

apps/web/utilities/middlewareHelper.ts:42–105

({
  hostname,
  pathname,
  url,
  userAgent,
}: {
  hostname: string | null;
  pathname: string;
  url: NextURL;
  userAgent: string | null;
})

  hostname.indexOf('linen.dev') > -1 ? 'www.linen.dev' : hostname;

export function rewrite({
  hostname,
  pathname,
  url,
  userAgent,
}: {
  hostname: string | null;
  pathname: string;
  url: NextURL;
  userAgent: string | null;
}) {
  function isLocalIpAddress(hostname: string | null) {
    if (!hostname) {
      return false;
    }
    return hostname.startsWith('192.168.1.');
  }
  if (isLocalIpAddress(hostname)) {
    return;
  }

  if (pathname === '/sitemap.xml') {
    return {
      rewrite: `${LINEN_STATIC_CDN}/sitemap/${cleanLinenHost(
        hostname || 'linen.dev'
      )}/sitemap.xml`,
    };
  }
  if (pathname === '/robots.txt') {
    return {
      rewrite: `${LINEN_STATIC_CDN}/sitemap/${cleanLinenHost(
        hostname || 'linen.dev'
      )}/robots.txt`,
    };
  }

  if (pathname.startsWith('/s/') && isBot(userAgent || '')) {
    url.pathname = url.pathname.replace('/s/', '/ssr/');
    return { rewrite: url.toString() };
  }

  if (!isSubdomainbasedRouting(hostname || '')) {
    return;
  }

  //Community name is the subdomain of the request or the full url if it's a redirect
  const communityName = getCommunityName(IS_PRODUCTION, hostname);

  if (!isTopLevelPathname(pathname) && communityName !== '') {
    url.pathname = `/s/${communityName}${pathname}`;
    url.searchParams.append('customDomain', '1');

    if (isBot(userAgent || '')) {
      url.pathname = url.pathname.replace('/s/', '/ssr/');
      return { rewrite: url.toString() };
    }

    return { rewrite: url.toString() };