Add ability to invite users

app/Http/Controllers/Auth/RegisterController.php

@@ -25,6 +25,7 @@ namespace FireflyIII\Http\Controllers\Auth;
 use FireflyIII\Events\RegisteredUser;
 use FireflyIII\Exceptions\FireflyException;
 use FireflyIII\Http\Controllers\Controller;
+use FireflyIII\Repositories\User\UserRepositoryInterface;
 use FireflyIII\Support\Http\Controllers\CreateStuff;
 use FireflyIII\User;
 use Illuminate\Contracts\Foundation\Application;
@@ -88,11 +89,15 @@ class RegisterController extends Controller
     public function register(Request $request)
     {
         $allowRegistration = $this->allowedToRegister();
+        $inviteCode        = (string) $request->get('invite_code');
+        $repository        = app(UserRepositoryInterface::class);
+        $validCode         = $repository->validateInviteCode($inviteCode);
 
-        if (false === $allowRegistration) {
+        if (false === $allowRegistration && false === $validCode) {
             throw new FireflyException('Registration is currently not available :(');
         }
 
+
         $this->validator($request->all())->validate();
         $user = $this->createUser($request->all());
         Log::info(sprintf('Registered new user %s', $user->email));
@@ -104,6 +109,10 @@ class RegisterController extends Controller
 
         $this->registered($request, $user);
 
+        if ($validCode) {
+            $repository->redeemCode($inviteCode);
+        }
+
         return redirect($this->redirectPath());
     }
 
@@ -157,4 +166,39 @@ class RegisterController extends Controller
 
         return view('auth.register', compact('isDemoSite', 'email', 'pageTitle'));
     }
+
+    /**
+     * Show the application registration form if the invitation code is valid.
+     *
+     * @param Request $request
+     *
+     * @return Factory|View
+     * @throws ContainerExceptionInterface
+     * @throws FireflyException
+     * @throws NotFoundExceptionInterface
+     */
+    public function showInviteForm(Request $request, string $code)
+    {
+        $isDemoSite        = app('fireflyconfig')->get('is_demo_site', config('firefly.configuration.is_demo_site'))->data;
+        $pageTitle         = (string) trans('firefly.register_page_title');
+        $repository        = app(UserRepositoryInterface::class);
+        $allowRegistration = $this->allowedToRegister();
+        $inviteCode        = $code;
+        $validCode         = $repository->validateInviteCode($inviteCode);
+
+        if (true === $allowRegistration) {
+            $message = 'You do not need an invite code on this installation.';
+
+            return view('error', compact('message'));
+        }
+        if(false === $validCode) {
+            $message = 'Invalid code.';
+
+            return view('error', compact('message'));
+        }
+
+        $email = $request->old('email');
+
+        return view('auth.register', compact('isDemoSite', 'email', 'pageTitle', 'inviteCode'));
+    }
 }