From 07949f68d8ced22499bd050d1440b2a04b316156 Mon Sep 17 00:00:00 2001
From: Remco Verhoef <remco@dutchcoders.io>
Date: Mon, 8 May 2017 14:07:51 -0700
Subject: [PATCH] Translate gcs errors to S3 compatible errors, fixes #4278

---
 cmd/gateway-gcs-layer.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/cmd/gateway-gcs-layer.go b/cmd/gateway-gcs-layer.go
index 4ab8cea7d..aff7900a8 100644
--- a/cmd/gateway-gcs-layer.go
+++ b/cmd/gateway-gcs-layer.go
@@ -101,6 +101,11 @@ func gcsToObjectError(err error, params ...string) error {
 	message := googleAPIErr.Errors[0].Message
 
 	switch reason {
+	case "required":
+		// Anonymous users does not have storage.xyz access to project 123.
+		fallthrough
+	case "keyInvalid":
+		fallthrough
 	case "forbidden":
 		err = PrefixAccessDenied{
 			Bucket: bucket,
@@ -237,7 +242,7 @@ func (l *gcsGateway) ListBuckets() ([]BucketInfo, error) {
 		}
 
 		if err != nil {
-			return []BucketInfo{}, err
+			return []BucketInfo{}, gcsToObjectError(traceError(err))
 		}
 
 		b = append(b, BucketInfo{