S3/Minio storage controller Support

storage-controllers/s3/Aws/Exception/CouldNotCreateChecksumException.php

@@ -0,0 +1,25 @@
+<?php
+namespace Aws\Exception;
+
+use Aws\HasMonitoringEventsTrait;
+use Aws\MonitoringEventsInterface;
+
+class CouldNotCreateChecksumException extends \RuntimeException implements
+    MonitoringEventsInterface
+{
+    use HasMonitoringEventsTrait;
+
+    public function __construct($algorithm, \Exception $previous = null)
+    {
+        $prefix = $algorithm === 'md5' ? "An" : "A";
+        parent::__construct("{$prefix} {$algorithm} checksum could not be "
+            . "calculated for the provided upload body, because it was not "
+            . "seekable. To prevent this error you can either 1) include the "
+            . "ContentMD5 or ContentSHA256 parameters with your request, 2) "
+            . "use a seekable stream for the body, or 3) wrap the non-seekable "
+            . "stream in a GuzzleHttp\\Psr7\\CachingStream object. You "
+            . "should be careful though and remember that the CachingStream "
+            . "utilizes PHP temp streams. This means that the stream will be "
+            . "temporarily stored on the local disk.", 0, $previous);
+    }
+}