add

vendor/aws/aws-sdk-php/src/Credentials/AssumeRoleCredentialProvider.php

@@ -0,0 +1,64 @@
+<?php
+namespace Aws\Credentials;
+
+use Aws\Exception\CredentialsException;
+use Aws\Result;
+use Aws\Sts\StsClient;
+use GuzzleHttp\Promise\PromiseInterface;
+
+/**
+ * Credential provider that provides credentials via assuming a role
+ * More Information, see: http://docs.aws.amazon.com/aws-sdk-php/v3/api/api-sts-2011-06-15.html#assumerole
+ */
+class AssumeRoleCredentialProvider
+{
+    const ERROR_MSG = "Missing required 'AssumeRoleCredentialProvider' configuration option: ";
+
+    /** @var StsClient */
+    private $client;
+
+    /** @var array */
+    private $assumeRoleParams;
+
+    /**
+     * The constructor requires following configure parameters:
+     *  - client: a StsClient
+     *  - assume_role_params: Parameters used to make assumeRole call
+     *
+     * @param array $config Configuration options
+     * @throws \InvalidArgumentException
+     */
+    public function __construct(array $config = [])
+    {
+        if (!isset($config['assume_role_params'])) {
+            throw new \InvalidArgumentException(self::ERROR_MSG . "'assume_role_params'.");
+        }
+
+        if (!isset($config['client'])) {
+            throw new \InvalidArgumentException(self::ERROR_MSG . "'client'.");
+        }
+
+        $this->client = $config['client'];
+        $this->assumeRoleParams = $config['assume_role_params'];
+    }
+
+    /**
+     * Loads assume role credentials.
+     *
+     * @return PromiseInterface
+     */
+    public function __invoke()
+    {
+        $client = $this->client;
+        return $client->assumeRoleAsync($this->assumeRoleParams)
+            ->then(function (Result $result) {
+                return $this->client->createCredentials($result);
+            })->otherwise(function (\RuntimeException $exception) {
+                throw new CredentialsException(
+                    "Error in retrieving assume role credentials.",
+                    0,
+                    $exception
+                );
+            });
+    }
+}