output nicer message when hitting rate limit

Signed-off-by: Michael Kaufmann <d00p@froxlor.org>

lib/Froxlor/Http/RateLimiter.php

@@ -2,7 +2,9 @@
 
 namespace Froxlor\Http;
 
+use Froxlor\Froxlor;
 use Froxlor\Settings;
+use Froxlor\UI\Panel\UI;
 
 class RateLimiter
 {
@@ -33,7 +35,12 @@ class RateLimiter
 		if ($remaining <= 0) {
 			header('HTTP/1.1 429 Too Many Requests');
 			header("Retry-After: $reset");
-			exit();
+			UI::twig()->addGlobal('install_mode', '1');
+			echo UI::twig()->render('Froxlor/misc/ratelimithint.html.twig', [
+				'retry' => $reset,
+				'installdir' => Froxlor::getInstallDir()
+			]);
+			die();
 		}
 
 		// Decrement the remaining requests and update the headers

templates/Froxlor/misc/ratelimithint.html.twig

@@ -0,0 +1,17 @@
+{% extends "Froxlor/base.html.twig" %}
+
+{% block content %}
+	<div class="container my-auto">
+		<div class="alert alert-warning fade show" role="alert">
+			<h4 class="alert-heading">
+				Whoops!
+			</h4>
+			<p>It seems like you've hit the rate limit.</p>
+			<p>Please slow down your requests and retry after {{ retry|date('d.m.Y H:i:s') }}</p>
+			<hr>
+			<p class="mt-1 text-center">
+				<a href="" class="btn btn-primary" title="Reload page">Reload</a>
+			</p>
+		</div>
+	</div>
+{% endblock %}