Improve the functionality surrounding the REGISTRATION variable in the .env file so it can continue to enable registration globally by setting its value to "true", but now also enable registration for a single IP address by setting its value to that address

app/Dashboard.php

@@ -84,4 +84,15 @@ class Dashboard
             return null;
         }
     }
+
+    /**
+     * Checks the registration status against the REGISTRATION variable in .env
+     *
+     * @return boolean
+     */
+    public static function canRegister()
+    {
+        $registration_status = env('REGISTRATION', false);
+        return $registration_status === true || $registration_status === \Request::ip();
+    }
 }

app/Http/Controllers/Auth/RegisterController.php

@@ -1,6 +1,7 @@
 <?php namespace App\Http\Controllers\Auth;
 
 use App\User;
+use App\Dashboard;
 use App\Http\Controllers\Controller;
 use Illuminate\Support\Facades\Hash;
 use Illuminate\Support\Facades\Validator;
@@ -61,13 +62,15 @@ class RegisterController extends Controller {
      */
     protected function create(array $data)
     {
-        if (env('REGISTRATION', false)) {
+        if (Dashboard::canRegister()) {
             return User::create([
                 'name' => $data['name'],
                 'email' => $data['email'],
                 'password' => Hash::make($data['password']),
                 'api_token' => str_random(60)
             ]);
+        } else {
+            abort(404);
         }
     }
 
@@ -78,7 +81,7 @@ class RegisterController extends Controller {
      */
     public function showRegistrationForm()
     {
-        if (env('REGISTRATION', false)) {
+        if (Dashboard::canRegister()) {
             return view('auth.register');
         } else {
             header('Location: /login');

resources/views/dashboard/sections/nav.blade.php

@@ -16,7 +16,7 @@
             @if (Auth::guest())
                 <li class="nav-item"><a class="nav-link {{ $current_page == 'login' ? 'active' : '' }}" href="/login">Login</a></li>
 
-                @if(env('REGISTRATION', false))
+                @if(App\Dashboard::canRegister())
                     <li class="nav-item"><a class="nav-link {{ $current_page == 'register' ? 'active' : '' }}" href="/register">Register</a></li>
                 @endif
             @else