Render the tag in head

extend.php

@@ -10,11 +10,15 @@
  */
 
 use Flarum\Extend;
+use Michaelbelgium\FlarumUmami\Listeners;
 
 return [
     (new Extend\Frontend('admin'))
         ->js(__DIR__.'/js/dist/admin.js')
         ->css(__DIR__.'/less/admin.less'),
 
+    (new Extend\Frontend('forum'))
+        ->content(Listeners\UmamiTagRenderer::class),
+
     new Extend\Locales(__DIR__.'/locale'),
 ];

src/Listeners/UmamiTagRenderer.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Michaelbelgium\FlarumUmami\Listeners;
+
+use Flarum\Frontend\Document;
+use Flarum\Settings\SettingsRepositoryInterface;
+use Psr\Http\Message\ServerRequestInterface;
+
+class UmamiTagRenderer
+{
+    protected SettingsRepositoryInterface $settings;
+
+    public function __construct(SettingsRepositoryInterface $settings)
+    {
+        $this->settings = $settings;
+    }
+
+    public function __invoke(Document $document, ServerRequestInterface $request)
+    {
+        $domain = $this->settings->get('michaelbelgium-umami.domain');
+        $site_id = $this->settings->get('michaelbelgium-umami.site_id');
+
+        if (str_ends_with($domain, '/'))
+            $domain = substr($domain, 0, -1);
+
+        $document->head[] = "<script defer data-website-id=\"$site_id\" src=\"$domain/script.js\"></script>";
+    }
+}