feat: gravatar integration

src/Twig/GravatarExtension.php

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Twig;
+
+use Twig\Extension\AbstractExtension;
+use Twig\TwigFunction;
+
+final class GravatarExtension extends AbstractExtension
+{
+    public function getFunctions(): array
+    {
+        return [
+            new TwigFunction('gravatar_url', [$this, 'getGravatarUrl']),
+        ];
+    }
+
+    /**
+     * Generates a Gravatar URL for the given email address.
+     */
+    public function getGravatarUrl(string $email, int $size = 80): string
+    {
+        $hash = md5(strtolower(trim($email)));
+
+        return sprintf('https://www.gravatar.com/avatar/%s?s=%d&d=404', $hash, $size);
+    }
+}