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package xmlrpc
import (
"bytes"
"encoding/xml"
"fmt"
"reflect"
"sort"
"strconv"
"strings"
"time"
)
// Base64 represents value in base64 encoding
type Base64 string
type encodeFunc func(reflect.Value) ([]byte, error)
func marshal(v interface{}) ([]byte, error) {
if v == nil {
return []byte{}, nil
}
val := reflect.ValueOf(v)
return encodeValue(val)
}
func encodeValue(val reflect.Value) ([]byte, error) {
var b []byte
var err error
if val.Kind() == reflect.Ptr || val.Kind() == reflect.Interface {
if val.IsNil() {
return []byte("<value/>"), nil
}
val = val.Elem()
}
switch val.Kind() {
case reflect.Struct:
switch val.Interface().(type) {
case time.Time:
t := val.Interface().(time.Time)
b = []byte(fmt.Sprintf("<dateTime.iso8601>%s</dateTime.iso8601>", t.Format(iso8601)))
default:
b, err = encodeStruct(val)
}
case reflect.Map:
b, err = encodeMap(val)
case reflect.Slice:
b, err = encodeSlice(val)
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
b = []byte(fmt.Sprintf("<int>%s</int>", strconv.FormatInt(val.Int(), 10)))
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
b = []byte(fmt.Sprintf("<i4>%s</i4>", strconv.FormatUint(val.Uint(), 10)))
case reflect.Float32, reflect.Float64:
b = []byte(fmt.Sprintf("<double>%s</double>",
strconv.FormatFloat(val.Float(), 'f', -1, val.Type().Bits())))
case reflect.Bool:
if val.Bool() {
b = []byte("<boolean>1</boolean>")
} else {
b = []byte("<boolean>0</boolean>")
}
case reflect.String:
var buf bytes.Buffer
xml.Escape(&buf, []byte(val.String()))
if _, ok := val.Interface().(Base64); ok {
b = []byte(fmt.Sprintf("<base64>%s</base64>", buf.String()))
} else {
b = []byte(fmt.Sprintf("<string>%s</string>", buf.String()))
}
default:
return nil, fmt.Errorf("xmlrpc encode error: unsupported type")
}
if err != nil {
return nil, err
}
return []byte(fmt.Sprintf("<value>%s</value>", string(b))), nil
}
func encodeStruct(structVal reflect.Value) ([]byte, error) {
var b bytes.Buffer
b.WriteString("<struct>")
structType := structVal.Type()
for i := 0; i < structType.NumField(); i++ {
fieldVal := structVal.Field(i)
fieldType := structType.Field(i)
name := fieldType.Tag.Get("xmlrpc")
// if the tag has the omitempty property, skip it
if strings.HasSuffix(name, ",omitempty") && isZero(fieldVal) {
continue
}
name = strings.TrimSuffix(name, ",omitempty")
if name == "" {
name = fieldType.Name
}
p, err := encodeValue(fieldVal)
if err != nil {
return nil, err
}
b.WriteString("<member>")
b.WriteString(fmt.Sprintf("<name>%s</name>", name))
b.Write(p)
b.WriteString("</member>")
}
b.WriteString("</struct>")
return b.Bytes(), nil
}
var sortMapKeys bool
func encodeMap(val reflect.Value) ([]byte, error) {
var t = val.Type()
if t.Key().Kind() != reflect.String {
return nil, fmt.Errorf("xmlrpc encode error: only maps with string keys are supported")
}
var b bytes.Buffer
b.WriteString("<struct>")
keys := val.MapKeys()
if sortMapKeys {
sort.Slice(keys, func(i, j int) bool { return keys[i].String() < keys[j].String() })
}
for i := 0; i < val.Len(); i++ {
key := keys[i]
kval := val.MapIndex(key)
b.WriteString("<member>")
b.WriteString(fmt.Sprintf("<name>%s</name>", key.String()))
p, err := encodeValue(kval)
if err != nil {
return nil, err
}
b.Write(p)
b.WriteString("</member>")
}
b.WriteString("</struct>")
return b.Bytes(), nil
}
func encodeSlice(val reflect.Value) ([]byte, error) {
var b bytes.Buffer
b.WriteString("<array><data>")
for i := 0; i < val.Len(); i++ {
p, err := encodeValue(val.Index(i))
if err != nil {
return nil, err
}
b.Write(p)
}
b.WriteString("</data></array>")
return b.Bytes(), nil
}
|
