From e8bf46a2fafb544d406f4c7dae381acb9464fb8e Mon Sep 17 00:00:00 2001
From: Angira Kekteeva <kira@nspcc.ru>
Date: Wed, 7 Jul 2021 17:52:36 +0300
Subject: [PATCH 1/3] [#131] Add meta to PutObject

Signed-off-by: Angira Kekteeva <kira@nspcc.ru>
---
 api/handler/put.go | 14 ++++++++++++++
 api/headers.go     |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/api/handler/put.go b/api/handler/put.go
index cae8a8df..2c054e5f 100644
--- a/api/handler/put.go
+++ b/api/handler/put.go
@@ -47,11 +47,14 @@ func (h *handler) PutObjectHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	metadata := parseMetadata(r)
+
 	params := &layer.PutObjectParams{
 		Bucket: bkt,
 		Object: obj,
 		Reader: r.Body,
 		Size:   r.ContentLength,
+		Header: metadata,
 	}
 
 	if info, err = h.obj.PutObject(r.Context(), params); err != nil {
@@ -74,6 +77,17 @@ func (h *handler) PutObjectHandler(w http.ResponseWriter, r *http.Request) {
 	api.WriteSuccessResponseHeadersOnly(w)
 }
 
+func parseMetadata(r *http.Request) map[string]string {
+	res := make(map[string]string)
+	for k, v := range r.Header {
+		if strings.HasPrefix(k, api.MetadataPrefix) {
+			key := strings.TrimPrefix(k, api.MetadataPrefix)
+			res[key] = v[0]
+		}
+	}
+	return res
+}
+
 func (h *handler) CreateBucketHandler(w http.ResponseWriter, r *http.Request) {
 	var (
 		err error
diff --git a/api/headers.go b/api/headers.go
index e983a342..b90e4035 100644
--- a/api/headers.go
+++ b/api/headers.go
@@ -2,6 +2,8 @@ package api
 
 // Standard S3 HTTP request/response constants.
 const (
+	MetadataPrefix = "X-Amz-Meta-"
+
 	LastModified       = "Last-Modified"
 	Date               = "Date"
 	ETag               = "ETag"

From da9a6e4b3354f2aaad19bc534057dc94f11cda10 Mon Sep 17 00:00:00 2001
From: Angira Kekteeva <kira@nspcc.ru>
Date: Thu, 8 Jul 2021 23:44:18 +0300
Subject: [PATCH 2/3] [#131] Fix metadata in HeadObject and GetObject

Signed-off-by: Angira Kekteeva <kira@nspcc.ru>
---
 api/handler/get.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/api/handler/get.go b/api/handler/get.go
index e8eb73f1..eaef90a9 100644
--- a/api/handler/get.go
+++ b/api/handler/get.go
@@ -69,7 +69,7 @@ func writeHeaders(h http.Header, info *layer.ObjectInfo) {
 	h.Set(api.ETag, info.HashSum)
 
 	for key, val := range info.Headers {
-		h.Set("X-"+key, val)
+		h.Set(api.MetadataPrefix+key, val)
 	}
 }
 

From d5dfc0006ae0678245bd6ea9a15d5901bd108d35 Mon Sep 17 00:00:00 2001
From: Angira Kekteeva <kira@nspcc.ru>
Date: Fri, 9 Jul 2021 00:01:33 +0300
Subject: [PATCH 3/3] [#131] Remove metadata from Object in ListObjects

Because ListObjects v1 and v2 shouldn't show metadata. Also aws cli
doesn't show metadata even we return it.

Signed-off-by: Angira Kekteeva <kira@nspcc.ru>
---
 api/handler/list.go     | 2 --
 api/handler/response.go | 3 ---
 2 files changed, 5 deletions(-)

diff --git a/api/handler/list.go b/api/handler/list.go
index 9c018e8d..f8324b26 100644
--- a/api/handler/list.go
+++ b/api/handler/list.go
@@ -202,7 +202,6 @@ func encodeV1(arg *listObjectsArgs, list *layer.ListObjectsInfo) *ListObjectsRes
 		res.Contents = append(res.Contents, Object{
 			Key:          obj.Name,
 			Size:         obj.Size,
-			UserMetadata: obj.Headers,
 			LastModified: obj.Created.Format(time.RFC3339),
 
 			Owner: Owner{
@@ -265,7 +264,6 @@ func encodeV2(arg *listObjectsArgs, list *layer.ListObjectsInfo) *ListObjectsV2R
 		res.Contents = append(res.Contents, Object{
 			Key:          obj.Name,
 			Size:         obj.Size,
-			UserMetadata: obj.Headers,
 			LastModified: obj.Created.Format(time.RFC3339),
 
 			Owner: Owner{
diff --git a/api/handler/response.go b/api/handler/response.go
index fda7f60d..42f2e556 100644
--- a/api/handler/response.go
+++ b/api/handler/response.go
@@ -104,9 +104,6 @@ type Object struct {
 
 	// The class of storage used to store the object.
 	StorageClass string `xml:"StorageClass,omitempty"`
-
-	// UserMetadata user-defined metadata
-	UserMetadata StringMap `xml:"UserMetadata,omitempty"`
 }
 
 // ObjectVersionResponse container for object version in the response of ListBucketObjectVersionsHandler.