Added SftpFilesystem

Author: creocoder

src/SftpFilesystem.php

@@ -0,0 +1,107 @@
+<?php
+/**
+ * @link https://github.com/creocoder/yii2-flysystem
+ * @copyright Copyright (c) 2015 Alexander Kochetov
+ * @license http://opensource.org/licenses/BSD-3-Clause
+ */
+
+namespace creocoder\flysystem;
+
+use League\Flysystem\Sftp\SftpAdapter;
+use Yii;
+use yii\base\InvalidConfigException;
+
+/**
+ * SftpFilesystem
+ *
+ * @author Alexander Kochetov <[email protected]>
+ */
+class SftpFilesystem extends Filesystem
+{
+    /**
+     * @var string
+     */
+    public $host;
+    /**
+     * @var string
+     */
+    public $port;
+    /**
+     * @var string
+     */
+    public $username;
+    /**
+     * @var string
+     */
+    public $password;
+    /**
+     * @var integer
+     */
+    public $timeout;
+    /**
+     * @var string
+     */
+    public $root;
+    /**
+     * @var string
+     */
+    public $privateKey;
+    /**
+     * @var integer
+     */
+    public $permPrivate;
+    /**
+     * @var integer
+     */
+    public $permPublic;
+
+    /**
+     * @inheritdoc
+     */
+    public function init()
+    {
+        if ($this->host === null) {
+            throw new InvalidConfigException('The "host" property must be set.');
+        }
+
+        if ($this->username === null) {
+            throw new InvalidConfigException('The "username" property must be set.');
+        }
+
+        if ($this->password === null || $this->privateKey === null) {
+            throw new InvalidConfigException('Either "password" or "privateKey" property must be set.');
+        }
+
+        if ($this->root !== null) {
+            $this->root = Yii::getAlias($this->root);
+        }
+
+        parent::init();
+    }
+
+    /**
+     * @return SftpAdapter
+     */
+    protected function prepareAdapter()
+    {
+        $config = [];
+
+        foreach ([
+            'host',
+            'port',
+            'username',
+            'password',
+            'timeout',
+            'root',
+            'privateKey',
+            'permPrivate',
+            'permPublic',
+        ] as $name) {
+            if ($this->$name !== null) {
+                $config[$name] = $this->$name;
+            }
+        }
+
+        return new SftpAdapter($config);
+    }
+}