Add invite-only registration mode

Support configurable on, invite-only, and off registration modes, including case-insensitive invitation checks and test coverage.

app/Actions/Fortify/CreateNewUser.php

@@ -4,9 +4,11 @@ declare(strict_types=1);
 
 namespace App\Actions\Fortify;
 
+use App\Enums\RegistrationMode;
 use App\Enums\Weekday;
 use App\Events\NewsletterRegistered;
 use App\Models\User;
+use App\Service\InvitationService;
 use App\Service\IpLookup\IpLookupServiceContract;
 use App\Service\TimezoneService;
 use App\Service\UserService;
@@ -31,13 +33,14 @@ class CreateNewUser implements CreatesNewUsers
      */
     public function create(array $input): User
     {
-        if (! config('app.enable_registration')) {
+        $registrationMode = RegistrationMode::fromConfig(config('app.enable_registration'));
+        if ($registrationMode === RegistrationMode::Off) {
             throw ValidationException::withMessages([
                 'email' => [__('Registration is disabled.')],
             ]);
         }
 
-        Validator::make($input, [
+        $validated = Validator::make($input, [
             'name' => [
                 'required',
                 'string',
@@ -60,6 +63,13 @@ class CreateNewUser implements CreatesNewUsers
             ],
         ])->validate();
 
+        if ($registrationMode === RegistrationMode::InviteOnly
+            && ! app(InvitationService::class)->hasInvitationForEmail((string) $validated['email'])) {
+            throw ValidationException::withMessages([
+                'email' => [__('Registration is only available to invited users.')],
+            ]);
+        }
+
         $timezone = null;
         if (array_key_exists('timezone', $input) && is_string($input['timezone'])) {
             if (app(TimezoneService::class)->isValid($input['timezone'])) {

app/Enums/RegistrationMode.php

@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Enums;
+
+enum RegistrationMode: string
+{
+    case On = 'on';
+    case InviteOnly = 'invite-only';
+    case Off = 'off';
+
+    public static function fromConfig(mixed $value): self
+    {
+        if ($value === true) {
+            return self::On;
+        }
+
+        if ($value === false || $value === null) {
+            return self::Off;
+        }
+
+        return match (strtolower(trim((string) $value))) {
+            '1', 'on', 'true' => self::On,
+            'invite', 'invite-only' => self::InviteOnly,
+            default => self::Off,
+        };
+    }
+}

app/Service/InvitationService.php

@@ -18,6 +18,13 @@ use Illuminate\Support\Facades\Mail;
 
 class InvitationService
 {
+    public function hasInvitationForEmail(string $email): bool
+    {
+        return OrganizationInvitation::query()
+            ->whereRaw('lower(email) = ?', [strtolower($email)])
+            ->exists();
+    }
+
     /**
      * @throws UserIsAlreadyMemberOfOrganizationApiException|InvitationForTheEmailAlreadyExistsApiException
      */