improvement: dns check

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

@@ -1,24 +1,47 @@
-import { asyncExecShell, getDomain, getEngine, getUserDetails } from '$lib/common';
+import { dev } from '$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 } = await event.request.json();
+	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
 		};

src/routes/applications/[id]/index.svelte

@@ -50,6 +50,7 @@
 	let domainEl: HTMLInputElement;
 
 	let loading = false;
+	let forceSave = false;
 	let debug = application.settings.debug;
 	let previews = application.settings.previews;
 	let dualCerts = application.settings.dualCerts;
@@ -78,10 +79,13 @@
 	async function handleSubmit() {
 		loading = true;
 		try {
-			await post(`/applications/${id}/check.json`, { fqdn: application.fqdn });
+			await post(`/applications/${id}/check.json`, { fqdn: application.fqdn, forceSave });
 			await post(`/applications/${id}.json`, { ...application });
 			return window.location.reload();
 		} catch ({ error }) {
+			if (error.startsWith('DNS not set')) {
+				forceSave = true;
+			}
 			return errorNotification(error);
 		} finally {
 			loading = false;
@@ -167,8 +171,11 @@
 				<button
 					type="submit"
 					class:bg-green-600={!loading}
+					class:bg-orange-600={forceSave}
 					class:hover:bg-green-500={!loading}
-					disabled={loading}>{loading ? 'Saving...' : 'Save'}</button
+					class:hover:bg-orange-400={forceSave}
+					disabled={loading}
+					>{loading ? 'Saving...' : forceSave ? 'Are you sure to continue?' : 'Save'}</button
 				>
 			{/if}
 		</div>
@@ -249,7 +256,7 @@
 				<div class="flex-col">
 					<label for="fqdn" class="pt-2 text-base font-bold text-stone-100">Domain (FQDN)</label>
 					<Explainer
-						text="If you specify <span class='text-green-500 font-bold'>https</span>, the application will be accessible only over https. SSL certificate will be generated for you.<br>If you specify <span class='text-green-500 font-bold'>www</span>, the application will be redirected (302) from non-www and vice versa.<br><br>To modify the domain, you must first stop the application."
+						text="If you specify <span class='text-green-500 font-bold'>https</span>, the application will be accessible only over https. SSL certificate will be generated for you.<br>If you specify <span class='text-green-500 font-bold'>www</span>, the application will be redirected (302) from non-www and vice versa.<br><br>To modify the domain, you must first stop the application.<br><br><span class='text-white font-bold'>You must set your DNS to point to the server IP in advance.</span>"
 					/>
 				</div>
 				<input