clean up

packages/backend/src/server/api/endpoints/federation/dns.ts

-import { promises as dns } from 'dns';
-import $ from 'cafy';
-import define from '../../define';
-import { Instances } from '@/models/index';
-import { toPuny } from '@/misc/convert-host';
-
-const resolver = new dns.Resolver();
-resolver.setServers(['1.1.1.1']);
-
-export const meta = {
-	tags: ['federation'],
-
-	requireCredential: false as const,
-
-	params: {
-		host: {
-			validator: $.str,
-		},
-	},
-};
-
-// eslint-disable-next-line import/no-default-export
-export default define(meta, async (ps, me) => {
-	const instance = await Instances.findOneOrFail({ host: toPuny(ps.host) });
-
-	const [
-		resolved4,
-		resolved6,
-		resolvedCname,
-		resolvedTxt,
-	] = await Promise.all([
-		resolver.resolve4(instance.host).catch(() => []),
-		resolver.resolve6(instance.host).catch(() => []),
-		resolver.resolveCname(instance.host).catch(() => []),
-		resolver.resolveTxt(instance.host).catch(() => []),
-	]);
-
-	return {
-		a: resolved4,
-		aaaa: resolved6,
-		cname: resolvedCname,
-		txt: resolvedTxt,
-	};
-});