Prevent deletion of options that have children attached to them.

closes #562

app/Exceptions/Service/ServiceOption/HasChildrenException.php

@@ -0,0 +1,16 @@
+<?php
+/*
+ * Pterodactyl - Panel
+ * Copyright (c) 2015 - 2017 Dane Everitt <dane@daneeveritt.com>.
+ *
+ * This software is licensed under the terms of the MIT license.
+ * https://opensource.org/licenses/MIT
+ */
+
+namespace Pterodactyl\Exceptions\Service\ServiceOption;
+
+use Pterodactyl\Exceptions\DisplayException;
+
+class HasChildrenException extends DisplayException
+{
+}

app/Services/Services/Options/OptionDeletionService.php

@@ -9,9 +9,11 @@
 
 namespace Pterodactyl\Services\Services\Options;
 
+use Webmozart\Assert\Assert;
 use Pterodactyl\Exceptions\Service\HasActiveServersException;
 use Pterodactyl\Contracts\Repository\ServerRepositoryInterface;
 use Pterodactyl\Contracts\Repository\ServiceOptionRepositoryInterface;
+use Pterodactyl\Exceptions\Service\ServiceOption\HasChildrenException;
 
 class OptionDeletionService
 {
@@ -46,17 +48,22 @@ class OptionDeletionService
      * @return int
      *
      * @throws \Pterodactyl\Exceptions\Service\HasActiveServersException
+     * @throws \Pterodactyl\Exceptions\Service\ServiceOption\HasChildrenException
      */
     public function handle($option)
     {
-        $servers = $this->serverRepository->findCountWhere([
-            ['option_id', '=', $option],
-        ]);
+        Assert::integerish($option, 'First argument passed to handle must be integer, received %s.');
 
+        $servers = $this->serverRepository->findCountWhere([['option_id', '=', $option]]);
         if ($servers > 0) {
             throw new HasActiveServersException(trans('exceptions.service.options.delete_has_servers'));
         }
 
+        $children = $this->repository->findCountWhere([['config_from', '=', $option]]);
+        if ($children > 0) {
+            throw new HasChildrenException(trans('exceptions.service.options.has_children'));
+        }
+
         return $this->repository->delete($option);
     }
 }

resources/lang/en/exceptions.php

@@ -24,6 +24,7 @@ return [
             'delete_has_servers' => 'A service option with active servers attached to it cannot be deleted from the Panel.',
             'invalid_copy_id' => 'The service option selected for copying a script from either does not exist, or is copying a script itself.',
             'must_be_child' => 'The "Copy Settings From" directive for this option must be a child option for the selected service.',
+            'has_children' => 'This service option is a parent to one or more other options. Please delete those options before deleting this option.',
         ],
         'variables' => [
             'env_not_unique' => 'The environment variable :name must be unique to this service option.',

tests/Unit/Services/Services/Options/OptionDeletionServiceTest.php

@@ -11,20 +11,22 @@ namespace Tests\Unit\Services\Services\Options;
 
 use Mockery as m;
 use Tests\TestCase;
+use Pterodactyl\Exceptions\DisplayException;
 use Pterodactyl\Exceptions\Service\HasActiveServersException;
 use Pterodactyl\Contracts\Repository\ServerRepositoryInterface;
 use Pterodactyl\Services\Services\Options\OptionDeletionService;
 use Pterodactyl\Contracts\Repository\ServiceOptionRepositoryInterface;
+use Pterodactyl\Exceptions\Service\ServiceOption\HasChildrenException;
 
 class OptionDeletionServiceTest extends TestCase
 {
     /**
-     * @var \Pterodactyl\Contracts\Repository\ServiceOptionRepositoryInterface
+     * @var \Pterodactyl\Contracts\Repository\ServiceOptionRepositoryInterface|\Mockery\Mock
      */
     protected $repository;
 
     /**
-     * @var \Pterodactyl\Contracts\Repository\ServerRepositoryInterface
+     * @var \Pterodactyl\Contracts\Repository\ServerRepositoryInterface|\Mockery\Mock
      */
     protected $serverRepository;
 
@@ -33,6 +35,9 @@ class OptionDeletionServiceTest extends TestCase
      */
     protected $service;
 
+    /**
+     * Setup tests.
+     */
     public function setUp()
     {
         parent::setUp();
@@ -49,6 +54,7 @@ class OptionDeletionServiceTest extends TestCase
     public function testOptionIsDeletedIfNoServersAreFound()
     {
         $this->serverRepository->shouldReceive('findCountWhere')->with([['option_id', '=', 1]])->once()->andReturn(0);
+        $this->repository->shouldReceive('findCountWhere')->with([['config_from', '=', 1]])->once()->andReturn(0);
         $this->repository->shouldReceive('delete')->with(1)->once()->andReturn(1);
 
         $this->assertEquals(1, $this->service->handle(1));
@@ -63,9 +69,25 @@ class OptionDeletionServiceTest extends TestCase
 
         try {
             $this->service->handle(1);
-        } catch (\Exception $exception) {
+        } catch (DisplayException $exception) {
             $this->assertInstanceOf(HasActiveServersException::class, $exception);
             $this->assertEquals(trans('exceptions.service.options.delete_has_servers'), $exception->getMessage());
         }
     }
+
+    /**
+     * Test that an exception is thrown if children options exist.
+     */
+    public function testExceptionIsThrownIfChildrenArePresent()
+    {
+        $this->serverRepository->shouldReceive('findCountWhere')->with([['option_id', '=', 1]])->once()->andReturn(0);
+        $this->repository->shouldReceive('findCountWhere')->with([['config_from', '=', 1]])->once()->andReturn(1);
+
+        try {
+            $this->service->handle(1);
+        } catch (DisplayException $exception) {
+            $this->assertInstanceOf(HasChildrenException::class, $exception);
+            $this->assertEquals(trans('exceptions.service.options.has_children'), $exception->getMessage());
+        }
+    }
 }