S3: add metadata with multipart upload

fix https://github.com/chrislusf/seaweedfs/issues/2173

weed/s3api/filer_multipart.go

@@ -35,6 +35,9 @@ func (s3a *S3ApiServer) createMultipartUpload(input *s3.CreateMultipartUploadInp
 			entry.Extended = make(map[string][]byte)
 		}
 		entry.Extended["key"] = []byte(*input.Key)
+		for k, v := range input.Metadata {
+			entry.Extended[k] = []byte(*v)
+		}
 	}); err != nil {
 		glog.Errorf("NewMultipartUpload error: %v", err)
 		return nil, s3err.ErrInternalError

weed/s3api/s3api_object_multipart_handlers.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/s3api/s3err"
+	weed_server "github.com/chrislusf/seaweedfs/weed/server"
 	"net/http"
 	"net/url"
 	"strconv"
@@ -24,10 +25,18 @@ const (
 func (s3a *S3ApiServer) NewMultipartUploadHandler(w http.ResponseWriter, r *http.Request) {
 	bucket, object := getBucketAndObject(r)
 
-	response, errCode := s3a.createMultipartUpload(&s3.CreateMultipartUploadInput{
+	createMultipartUploadInput := &s3.CreateMultipartUploadInput{
-		Bucket: aws.String(bucket),
+		Bucket:   aws.String(bucket),
-		Key:    objectKey(aws.String(object)),
+		Key:      objectKey(aws.String(object)),
-	})
+		Metadata: make(map[string]*string),
+	}
+
+	metadata := weed_server.SaveAmzMetaData(r, nil, false)
+	for k, v := range metadata {
+		createMultipartUploadInput.Metadata[k] = aws.String(string(v))
+	}
+
+	response, errCode := s3a.createMultipartUpload(createMultipartUploadInput)
 
 	glog.V(2).Info("NewMultipartUploadHandler", s3err.EncodeXMLResponse(response), errCode)
 

weed/server/filer_server_handlers_write_autochunk.go

@@ -214,10 +214,6 @@ func (fs *FilerServer) saveMetaData(ctx context.Context, r *http.Request, fileNa
 		Size: int64(entry.FileSize),
 	}
 
-	if entry.Extended == nil {
-		entry.Extended = make(map[string][]byte)
-	}
-
 	entry.Extended = SaveAmzMetaData(r, entry.Extended, false)
 
 	for k, v := range r.Header {