Implement 'stop forum spam' api to prevent form spam

public/typo3conf/ext/ep_events/Classes/Service/SpamProtectService.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace EP\EpEvents\Service;
+
+use Symfony\Component\HttpClient\HttpClient;
+use Symfony\Contracts\HttpClient\Exception\TransportExceptionInterface;
+use TYPO3\CMS\Core\SingletonInterface;
+
+class SpamProtectService implements SingletonInterface
+{
+    public function isSpamEmail(string $email): bool
+    {
+        $client = HttpClient::create();
+
+        try {
+            $response = $client->request('GET', 'https://api.stopforumspam.org/api', [
+                'query' => [
+                    'emailhash' => md5($email),
+                ]
+            ]);
+            $result = simplexml_load_string($response->getContent());
+            $success = (bool)$result->attributes()['success'];
+
+            if (false === $success) {
+                return false;
+            }
+
+            $appears = (string)$result->appears === 'yes';
+            if (true === $appears) {
+                return true;
+            }
+        } catch (TransportExceptionInterface $e) {
+        }
+
+        return false;
+    }
+}