Xray-core/common/reflect/marshal.go

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package reflect
import (
"bytes"
"encoding/json"
"fmt"
"reflect"
"strings"
cnet "github.com/xtls/xray-core/common/net"
cserial "github.com/xtls/xray-core/common/serial"
"github.com/xtls/xray-core/infra/conf"
)
func MarshalToJson(v interface{}, insertTypeInfo bool) (string, bool) {
if itf := marshalInterface(v, true, insertTypeInfo); itf != nil {
if b, err := JSONMarshalWithoutEscape(itf); err == nil {
return string(b[:]), true
}
}
return "", false
}
func JSONMarshalWithoutEscape(t interface{}) ([]byte, error) {
buffer := &bytes.Buffer{}
encoder := json.NewEncoder(buffer)
encoder.SetIndent("", " ")
encoder.SetEscapeHTML(false)
err := encoder.Encode(t)
return buffer.Bytes(), err
}
func marshalTypedMessage(v *cserial.TypedMessage, ignoreNullValue bool, insertTypeInfo bool) interface{} {
if v == nil {
return nil
}
tmsg, err := v.GetInstance()
if err != nil {
return nil
}
r := marshalInterface(tmsg, ignoreNullValue, insertTypeInfo)
if msg, ok := r.(map[string]interface{}); ok && insertTypeInfo {
msg["_TypedMessage_"] = v.Type
}
return r
}
func marshalSlice(v reflect.Value, ignoreNullValue bool, insertTypeInfo bool) interface{} {
r := make([]interface{}, 0)
for i := 0; i < v.Len(); i++ {
rv := v.Index(i)
if rv.CanInterface() {
value := rv.Interface()
r = append(r, marshalInterface(value, ignoreNullValue, insertTypeInfo))
}
}
return r
}
func isNullValue(f reflect.StructField, rv reflect.Value) bool {
if rv.Kind() == reflect.String && rv.Len() == 0 {
return true
} else if !isValueKind(rv.Kind()) && rv.IsNil() {
return true
} else if tag := f.Tag.Get("json"); strings.Contains(tag, "omitempty") {
if !rv.IsValid() || rv.IsZero() {
return true
}
}
return false
}
func toJsonName(f reflect.StructField) string {
if tags := f.Tag.Get("protobuf"); len(tags) > 0 {
for _, tag := range strings.Split(tags, ",") {
if before, after, ok := strings.Cut(tag, "="); ok && before == "json" {
return after
}
}
}
if tag := f.Tag.Get("json"); len(tag) > 0 {
if before, _, ok := strings.Cut(tag, ","); ok {
return before
} else {
return tag
}
}
return f.Name
}
func marshalStruct(v reflect.Value, ignoreNullValue bool, insertTypeInfo bool) interface{} {
r := make(map[string]interface{})
t := v.Type()
for i := 0; i < v.NumField(); i++ {
rv := v.Field(i)
if rv.CanInterface() {
ft := t.Field(i)
if !ignoreNullValue || !isNullValue(ft, rv) {
name := toJsonName(ft)
value := rv.Interface()
tv := marshalInterface(value, ignoreNullValue, insertTypeInfo)
r[name] = tv
}
}
}
return r
}
func marshalMap(v reflect.Value, ignoreNullValue bool, insertTypeInfo bool) interface{} {
// policy.level is map[uint32] *struct
kt := v.Type().Key()
vt := reflect.TypeOf((*interface{})(nil))
mt := reflect.MapOf(kt, vt)
r := reflect.MakeMap(mt)
for _, key := range v.MapKeys() {
rv := v.MapIndex(key)
if rv.CanInterface() {
iv := rv.Interface()
tv := marshalInterface(iv, ignoreNullValue, insertTypeInfo)
if tv != nil || !ignoreNullValue {
r.SetMapIndex(key, reflect.ValueOf(&tv))
}
}
}
return r.Interface()
}
func marshalIString(v interface{}) (r string, ok bool) {
defer func() {
if err := recover(); err != nil {
r = ""
ok = false
}
}()
if iStringFn, ok := v.(interface{ String() string }); ok {
return iStringFn.String(), true
}
return "", false
}
func serializePortList(portList *cnet.PortList) (interface{}, bool) {
if portList == nil {
return nil, false
}
n := len(portList.Range)
if n == 1 {
if first := portList.Range[0]; first.From == first.To {
return first.From, true
}
}
r := make([]string, 0, n)
for _, pr := range portList.Range {
if pr.From == pr.To {
r = append(r, pr.FromPort().String())
} else {
r = append(r, fmt.Sprintf("%d-%d", pr.From, pr.To))
}
}
return strings.Join(r, ","), true
}
func marshalKnownType(v interface{}, ignoreNullValue bool, insertTypeInfo bool) (interface{}, bool) {
switch ty := v.(type) {
case cserial.TypedMessage:
return marshalTypedMessage(&ty, ignoreNullValue, insertTypeInfo), true
case *cserial.TypedMessage:
return marshalTypedMessage(ty, ignoreNullValue, insertTypeInfo), true
case map[string]json.RawMessage:
return ty, true
case []json.RawMessage:
return ty, true
case *json.RawMessage, json.RawMessage:
return ty, true
case *cnet.IPOrDomain:
if domain := v.(*cnet.IPOrDomain); domain != nil {
return domain.AsAddress().String(), true
}
return nil, false
case *cnet.PortList:
npl := v.(*cnet.PortList)
return serializePortList(npl)
case *conf.PortList:
cpl := v.(*conf.PortList)
return serializePortList(cpl.Build())
case cnet.Address:
if addr := v.(cnet.Address); addr != nil {
return addr.String(), true
}
return nil, false
default:
return nil, false
}
}
func isValueKind(kind reflect.Kind) bool {
switch kind {
case reflect.Bool,
reflect.Int,
reflect.Int8,
reflect.Int16,
reflect.Int32,
reflect.Int64,
reflect.Uint,
reflect.Uint8,
reflect.Uint16,
reflect.Uint32,
reflect.Uint64,
reflect.Uintptr,
reflect.Float32,
reflect.Float64,
reflect.Complex64,
reflect.Complex128,
reflect.String:
return true
default:
return false
}
}
func marshalInterface(v interface{}, ignoreNullValue bool, insertTypeInfo bool) interface{} {
if r, ok := marshalKnownType(v, ignoreNullValue, insertTypeInfo); ok {
return r
}
rv := reflect.ValueOf(v)
if rv.Kind() == reflect.Ptr {
rv = rv.Elem()
}
k := rv.Kind()
if k == reflect.Invalid {
return nil
}
if ty := rv.Type().Name(); isValueKind(k) {
if k.String() != ty {
if s, ok := marshalIString(v); ok {
return s
}
}
return v
}
// fmt.Println("kind:", k, "type:", rv.Type().Name())
switch k {
case reflect.Struct:
return marshalStruct(rv, ignoreNullValue, insertTypeInfo)
case reflect.Slice:
return marshalSlice(rv, ignoreNullValue, insertTypeInfo)
case reflect.Array:
return marshalSlice(rv, ignoreNullValue, insertTypeInfo)
case reflect.Map:
return marshalMap(rv, ignoreNullValue, insertTypeInfo)
default:
break
}
if str, ok := marshalIString(v); ok {
return str
}
return nil
}