coolify/src/routes/applications/[id]/check.json.ts

import { dev } from '$app/env';
import { getDomain, getUserDetails } from '$lib/common';
import * as db from '$lib/database';
import { ErrorHandler } from '$lib/database';
import type { RequestHandler } from '@sveltejs/kit';
import { promises as dns } from 'dns';

export const post: RequestHandler = async (event) => {
	const { status, body } = await getUserDetails(event);
	if (status === 401) return { status, body };

	const { id } = event.params;
	let { fqdn, forceSave } = await event.request.json();
	fqdn = fqdn.toLowerCase();

	try {
		const domain = getDomain(fqdn);
		const found = await db.isDomainConfigured({ id, fqdn });
		if (found) {
			throw {
				message: `Domain ${getDomain(fqdn).replace('www.', '')} is already used.`
			};
		}
		if (!dev && !forceSave) {
			let ip = [];
			let localIp = [];
			dns.setServers(['1.1.1.1', '8.8.8.8']);

			try {
				localIp = await dns.resolve4(event.url.hostname);
			} catch (error) {}
			try {
				ip = await dns.resolve4(domain);
			} catch (error) {}

			if (localIp?.length > 0) {
				if (ip?.length === 0 || !ip.includes(localIp[0])) {
					throw {
						message: `DNS not set or propogated for ${domain}.<br><br>Please check your DNS settings.`
					};
				}
			}
		}

		return {
			status: 200
		};
	} catch (error) {
		return ErrorHandler(error);
	}
};