Include egg variables in the output from the API

app/Transformers/Api/Client/EggVariableTransformer.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace Pterodactyl\Transformers\Api\Client;
+
+use Pterodactyl\Models\EggVariable;
+
+class EggVariableTransformer extends BaseClientTransformer
+{
+    /**
+     * @return string
+     */
+    public function getResourceName(): string
+    {
+        return EggVariable::RESOURCE_NAME;
+    }
+
+    /**
+     * @param \Pterodactyl\Models\EggVariable $variable
+     * @return array
+     */
+    public function transform(EggVariable $variable)
+    {
+        return [
+            'name' => $variable->name,
+            'description' => $variable->description,
+            'env_variable' => $variable->env_variable,
+            'default_value' => $variable->default_value,
+            'server_value' => $variable->server_value,
+            'is_editable' => $variable->user_editable,
+            'rules' => $variable->rules,
+        ];
+    }
+}

app/Transformers/Api/Client/ServerTransformer.php

@@ -6,13 +6,17 @@ use Pterodactyl\Models\Egg;
 use Pterodactyl\Models\Server;
 use Pterodactyl\Models\Subuser;
 use Pterodactyl\Models\Allocation;
+use Illuminate\Container\Container;
+use Pterodactyl\Models\EggVariable;
+use Pterodactyl\Services\Servers\StartupCommandService;
+use Pterodactyl\Transformers\Api\Client\EggVariableTransformer;
 
 class ServerTransformer extends BaseClientTransformer
 {
     /**
      * @var string[]
      */
-    protected $defaultIncludes = ['allocations'];
+    protected $defaultIncludes = ['allocations', 'variables'];
 
     /**
      * @var array
@@ -36,6 +40,9 @@ class ServerTransformer extends BaseClientTransformer
      */
     public function transform(Server $server): array
     {
+        /** @var \Pterodactyl\Services\Servers\StartupCommandService $service */
+        $service = Container::getInstance()->make(StartupCommandService::class);
+
         return [
             'server_owner' => $this->getKey()->user_id === $server->owner_id,
             'identifier' => $server->uuidShort,
@@ -54,6 +61,7 @@ class ServerTransformer extends BaseClientTransformer
                 'io' => $server->io,
                 'cpu' => $server->cpu,
             ],
+            'invocation' => $service->handle($server),
             'feature_limits' => [
                 'databases' => $server->database_limit,
                 'allocations' => $server->allocation_limit,
@@ -80,6 +88,20 @@ class ServerTransformer extends BaseClientTransformer
         );
     }
 
+    /**
+     * @param \Pterodactyl\Models\Server $server
+     * @return \League\Fractal\Resource\Collection
+     * @throws \Pterodactyl\Exceptions\Transformer\InvalidTransformerLevelException
+     */
+    public function includeVariables(Server $server)
+    {
+        return $this->collection(
+            $server->variables->where('user_viewable', true),
+            $this->makeTransformer(EggVariableTransformer::class),
+            EggVariable::RESOURCE_NAME
+        );
+    }
+
     /**
      * Returns the egg associated with this server.
      *