first commit -> move some files from one-api

vendor/aws_sdk/Aws/Endpoint/UseDualstackEndpoint/Configuration.php

@@ -0,0 +1,41 @@
+<?php
+namespace Aws\Endpoint\UseDualstackEndpoint;
+
+use Aws;
+use Aws\Endpoint\UseDualstackEndpoint\Exception\ConfigurationException;
+
+class Configuration implements ConfigurationInterface
+{
+    private $useDualstackEndpoint;
+
+    public function __construct($useDualstackEndpoint, $region)
+    {
+        $this->useDualstackEndpoint = Aws\boolean_value($useDualstackEndpoint);
+        if (is_null($this->useDualstackEndpoint)) {
+            throw new ConfigurationException("'use_dual_stack_endpoint' config option"
+                . " must be a boolean value.");
+        }
+        if ($this->useDualstackEndpoint == true
+            && (strpos($region, "iso-") !== false || strpos($region, "-iso") !== false)
+        ) {
+            throw new ConfigurationException("Dual-stack is not supported in ISO regions");        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isUseDualstackEndpoint()
+    {
+        return $this->useDualstackEndpoint;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function toArray()
+    {
+        return [
+            'use_dual_stack_endpoint' => $this->isUseDualstackEndpoint(),
+        ];
+    }
+}