Добавлена логика HasJoined для сервера авторизации Minecraft

Исправлена ошибка в JoinForm
Добавлено базовое API для общения с сервером системы скинов

api/modules/session/models/protocols/BaseHasJoined.php

@@ -0,0 +1,31 @@
+<?php
+namespace api\modules\session\models\protocols;
+
+use yii\validators\RequiredValidator;
+
+abstract class BaseHasJoined implements HasJoinedInterface {
+
+    private $username;
+    private $serverId;
+
+    public function __construct(string $username, string $serverId) {
+        $this->username = $username;
+        $this->serverId = $serverId;
+    }
+
+    public function getUsername() : string {
+        return $this->username;
+    }
+
+    public function getServerId() : string {
+        return $this->serverId;
+    }
+
+    public function validate() : bool {
+        $validator = new RequiredValidator();
+
+        return $validator->validate($this->username)
+            && $validator->validate($this->serverId);
+    }
+
+}

api/modules/session/models/protocols/HasJoinedInterface.php

@@ -0,0 +1,12 @@
+<?php
+namespace api\modules\session\models\protocols;
+
+interface HasJoinedInterface {
+
+    public function getUsername() : string;
+
+    public function getServerId() : string;
+
+    public function validate() : bool;
+
+}

api/modules/session/models/protocols/LegacyHasJoined.php

@@ -0,0 +1,6 @@
+<?php
+namespace api\modules\session\models\protocols;
+
+class LegacyHasJoined extends BaseHasJoined {
+
+}

api/modules/session/models/protocols/ModernHasJoined.php

@@ -0,0 +1,6 @@
+<?php
+namespace api\modules\session\models\protocols;
+
+class ModernHasJoined extends BaseHasJoined {
+
+}