added countries support

Modules/Countries/Rules/ValidCountryCode.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Modules\Countries\Rules;
+
+use Closure;
+use Illuminate\Contracts\Validation\ValidationRule;
+use Modules\Countries\Models\Country;
+
+class ValidCountryCode implements ValidationRule
+{
+    public function __construct(private readonly bool $activeOnly = true)
+    {
+    }
+
+    public function validate(string $attribute, mixed $value, Closure $fail): void
+    {
+        if (! is_string($value) || strlen($value) !== 2) {
+            $fail('The :attribute must be a valid ISO 3166 alpha-2 country code.');
+            return;
+        }
+
+        $query = Country::query()->where('alpha2', strtoupper($value));
+
+        if ($this->activeOnly) {
+            $query->where('is_active', true);
+        }
+
+        if (! $query->exists()) {
+            $fail('The :attribute must be a supported country.');
+        }
+    }
+}