refactor!: serve the static frontend trough the backend (#520)

Co-authored-by: Alessandro (Ale) Segala <43508+ItalyPaleAle@users.noreply.github.com>

frontend/src/routes/+layout.ts

@@ -0,0 +1,55 @@
+import { goto } from '$app/navigation';
+import AppConfigService from '$lib/services/app-config-service';
+import UserService from '$lib/services/user-service';
+import type { User } from '$lib/types/user.type';
+import type { LayoutLoad } from './$types';
+
+export const ssr = false;
+
+export const load: LayoutLoad = async ({ url }) => {
+	const userService = new UserService();
+	const appConfigService = new AppConfigService();
+
+	const userPromise = userService.getCurrent().catch(() => null);
+
+	const appConfigPromise = appConfigService.list().catch((e) => {
+		console.error(
+			`Failed to get application configuration: ${e.response?.data.error || e.message}`
+		);
+		return null;
+	});
+
+	const [user, appConfig] = await Promise.all([userPromise, appConfigPromise]);
+
+	const redirectPath = await getRedirectPath(url.pathname, user);
+	if (redirectPath) {
+		goto(redirectPath);
+	}
+
+	return {
+		user,
+		appConfig
+	};
+};
+
+const getRedirectPath = async (path: string, user: User | null) => {
+	const isSignedIn = !!user;
+	const isAdmin = user?.isAdmin;
+
+	const isUnauthenticatedOnlyPath =
+		path == '/login' || path.startsWith('/login/') || path == '/lc' || path.startsWith('/lc/');
+	const isPublicPath = ['/authorize', '/device', '/health', '/healthz'].includes(path);
+	const isAdminPath = path == '/settings/admin' || path.startsWith('/settings/admin/');
+
+	if (!isUnauthenticatedOnlyPath && !isPublicPath && !isSignedIn) {
+		return '/login';
+	}
+
+	if (isUnauthenticatedOnlyPath && isSignedIn) {
+		return '/settings';
+	}
+
+	if (isAdminPath && !isAdmin) {
+		return '/settings';
+	}
+};