From 9b59d099d18bb2f1894f81b0f52a9c853aa5e599 Mon Sep 17 00:00:00 2001
From: Andrew Gaul <gaul@apache.org>
Date: Tue, 21 Nov 2017 11:36:11 -0800
Subject: [PATCH] JCLOUDS-1358: Handle 0-byte input with v4 signature

Previously this failed due to use of mark and reset on the
InputStream.
---
 .../jclouds/s3/filters/Aws4SignerForAuthorizationHeader.java   | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/apis/s3/src/main/java/org/jclouds/s3/filters/Aws4SignerForAuthorizationHeader.java b/apis/s3/src/main/java/org/jclouds/s3/filters/Aws4SignerForAuthorizationHeader.java
index 4bb160a1f5..f481fc06d7 100644
--- a/apis/s3/src/main/java/org/jclouds/s3/filters/Aws4SignerForAuthorizationHeader.java
+++ b/apis/s3/src/main/java/org/jclouds/s3/filters/Aws4SignerForAuthorizationHeader.java
@@ -169,8 +169,7 @@ public class Aws4SignerForAuthorizationHeader extends Aws4SignerBase {
 
    protected String getPayloadHash(HttpRequest request) {
       Payload payload = request.getPayload();
-      if (payload == null) {
-         // when payload is null.
+      if (payload == null || "0".equals(getContentLength(request))) {
          return getEmptyPayloadContentHash();
       }
       return calculatePayloadContentHash(payload);