feat: add info route

app/routes/util/info.ts

@@ -0,0 +1,59 @@
+import { versions } from 'node:process';
+import { data } from 'react-router';
+import type { Route } from './+types/info';
+
+export async function loader({ request, context }: Route.LoaderArgs) {
+	if (context.config.server.info_secret == null) {
+		throw data(
+			{
+				status: 'Forbidden',
+			},
+			403,
+		);
+	}
+
+	const bearer = request.headers.get('Authorization') ?? '';
+	if (!bearer.startsWith('Bearer ')) {
+		throw data(
+			{
+				status: 'Unauthorized',
+			},
+			401,
+		);
+	}
+
+	const token = bearer.slice('Bearer '.length).trim();
+	if (token !== context.config.server.info_secret) {
+		throw data(
+			{
+				status: 'Forbidden',
+			},
+			403,
+		);
+	}
+
+	// Use a fake API key for healthcheck
+	const api = context.hsApi.getRuntimeClient('fake-api-key');
+	const healthy = await api.isHealthy();
+
+	const body = {
+		status: healthy ? 'OK' : 'ERROR',
+		headplane_version: __VERSION__,
+		headscale_canonical_version: healthy ? context.hsApi.apiVersion : 'unknown',
+		internal_versions: {
+			node: versions.node,
+			v8: versions.v8,
+			uv: versions.uv,
+			zlib: versions.zlib,
+			openssl: versions.openssl,
+			libc: versions.libc,
+		},
+	};
+
+	return new Response(JSON.stringify(body), {
+		status: 200,
+		headers: {
+			'Content-Type': 'application/json',
+		},
+	});
+}