Add server details modification endpoint to API.

app/Http/Requests/Api/Application/Servers/UpdateServerDetailsRequest.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace Pterodactyl\Http\Requests\Api\Application\Servers;
+
+use Pterodactyl\Models\Server;
+
+class UpdateServerDetailsRequest extends ServerWriteRequest
+{
+    /**
+     * Rules to apply to a server details update request.
+     *
+     * @return array
+     */
+    public function rules(): array
+    {
+        $rules = Server::getUpdateRulesForId($this->route()->parameter('server')->id);
+
+        return [
+            'name' => $rules['name'],
+            'user' => $rules['owner_id'],
+            'description' => $rules['description'],
+        ];
+    }
+
+    /**
+     * Convert the posted data into the correct format that is expected
+     * by the application.
+     *
+     * @return array
+     */
+    public function validated(): array
+    {
+        return [
+            'name' => $this->input('name'),
+            'owner_id' => $this->input('user'),
+            'description' => $this->input('description'),
+        ];
+    }
+
+    /**
+     * Rename some of the attributes in error messages to clarify the field
+     * being discussed.
+     *
+     * @return array
+     */
+    public function attributes(): array
+    {
+        return [
+            'user' => 'User ID',
+            'name' => 'Server Name',
+        ];
+    }
+}