Use proper Event and Service Provider extenders

extensions/akismet/src/Provider/AkismetProvider.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace Flarum\Akismet\Provider;
+
+use Flarum\Foundation\AbstractServiceProvider;
+use Flarum\Http\UrlGenerator;
+use Flarum\Settings\SettingsRepositoryInterface;
+use TijsVerkoyen\Akismet\Akismet;
+
+class AkismetProvider extends AbstractServiceProvider
+{
+    public function register()
+    {
+        $this->app->bind(Akismet::class, function () {
+            /** @var SettingsRepositoryInterface $settings */
+            $settings = $this->app->make(SettingsRepositoryInterface::class);
+            /** @var UrlGenerator $url */
+            $url = $this->app->make(UrlGenerator::class);
+
+            return new Akismet(
+                $settings->get('flarum-akismet.api_key'),
+                $url->to('forum')->base()
+            );
+        });
+    }
+}