// Copyright (c) 2015-2021 MinIO, Inc.//// This file is part of MinIO Object Storage stack//// This program is free software: you can redistribute it and/or modify// it under the terms of the GNU Affero General Public License as published by// the Free Software Foundation, either version 3 of the License, or// (at your option) any later version.//// This program is distributed in the hope that it will be useful// but WITHOUT ANY WARRANTY; without even the implied warranty of// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the// GNU Affero General Public License for more details.//// You should have received a copy of the GNU Affero General Public License// along with this program.  If not, see <http://www.gnu.org/licenses/>. package json import (	"encoding/xml"	"fmt"	"strings") const (	document = "document"	lines    = "lines" 	defaultRecordDelimiter = "\n") // ReaderArgs - represents elements inside <InputSerialization><JSON/> in request XML.type ReaderArgs struct {	ContentType string `xml:"Type"`	unmarshaled bool} // IsEmpty - returns whether reader args is empty or not.func (args *ReaderArgs) IsEmpty() bool {	return !args.unmarshaled} // UnmarshalXML - decodes XML data.func (args *ReaderArgs) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {	// Make subtype to avoid recursive UnmarshalXML().	type subReaderArgs ReaderArgs	parsedArgs := subReaderArgs{}	if err := d.DecodeElement(&parsedArgs, &start); err != nil {		return err	} 	parsedArgs.ContentType = strings.ToLower(parsedArgs.ContentType)	switch parsedArgs.ContentType {	case document, lines:	default:		return errInvalidJSONType(fmt.Errorf("invalid ContentType '%v'", parsedArgs.ContentType))	} 	*args = ReaderArgs(parsedArgs)	args.unmarshaled = true	return nil} // WriterArgs - represents elements inside <OutputSerialization><JSON/> in request XML.type WriterArgs struct {	RecordDelimiter string `xml:"RecordDelimiter"`	unmarshaled     bool} // IsEmpty - returns whether writer args is empty or not.func (args *WriterArgs) IsEmpty() bool {	return !args.unmarshaled} // UnmarshalXML - decodes XML data.func (args *WriterArgs) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {	// Make subtype to avoid recursive UnmarshalXML().	type subWriterArgs WriterArgs	parsedArgs := subWriterArgs{}	if err := d.DecodeElement(&parsedArgs, &start); err != nil {		return err	} 	switch len(parsedArgs.RecordDelimiter) {	case 0:		parsedArgs.RecordDelimiter = defaultRecordDelimiter	case 1, 2:	default:		return fmt.Errorf("invalid RecordDelimiter '%v'", parsedArgs.RecordDelimiter)	} 	*args = WriterArgs(parsedArgs)	args.unmarshaled = true	return nil}