remove gateway completely (#15929)

cmd/object-api-utils.go

@@ -940,20 +940,6 @@ func sealETagFn(key crypto.ObjectKey) SealMD5CurrFn {
 	return fn
 }
 
-// CleanMinioInternalMetadataKeys removes X-Amz-Meta- prefix from minio internal
-// encryption metadata that was sent by minio gateway
-func CleanMinioInternalMetadataKeys(metadata map[string]string) map[string]string {
-	newMeta := make(map[string]string, len(metadata))
-	for k, v := range metadata {
-		if strings.HasPrefix(k, "X-Amz-Meta-X-Minio-Internal-") {
-			newMeta[strings.TrimPrefix(k, "X-Amz-Meta-")] = v
-		} else {
-			newMeta[k] = v
-		}
-	}
-	return newMeta
-}
-
 // compressOpts are the options for writing compressed data.
 var compressOpts []s2.WriterOption