/
encoder.go
161 lines (132 loc) · 3.07 KB
/
encoder.go
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package xmlrpc
import (
"encoding/xml"
"fmt"
"io"
"reflect"
"time"
)
const iso8601 = "20060102T15:04:05"
type encoder struct {
w io.Writer
err error
}
func newEncoder(w io.Writer) *encoder {
return &encoder{
w: w,
}
}
func (e *encoder) Write(b []byte) (int, error) {
if e.err != nil {
return 0, e.err
}
i, err := e.w.Write(b)
e.err = err
return i, err
}
var _ io.Writer = &encoder{}
func (e *encoder) EncodeRequest(method string, params interface{}) error {
fmt.Fprint(e, `<?xml version="1.0"?>`)
fmt.Fprint(e, "<methodCall>")
fmt.Fprintf(e, "<methodName>%s</methodName>", method)
fmt.Fprint(e, "<params>")
e.encodeParams(params)
fmt.Fprint(e, "</params>")
fmt.Fprint(e, "</methodCall>")
return e.err
}
func (e *encoder) EncodeResponse(params interface{}) error {
fmt.Fprint(e, `<?xml version="1.0"?>`)
fmt.Fprint(e, "<methodResponse>")
fmt.Fprint(e, "<params>")
e.encodeParams(params)
fmt.Fprint(e, "</params>")
fmt.Fprint(e, "</methodResponse>")
return e.err
}
func (e *encoder) encodeParams(params interface{}) {
val := reflect.ValueOf(params)
if val.Kind() == reflect.Slice {
for i := 0; i < val.Len(); i++ {
e.encodeParam(val.Index(i))
}
} else {
e.encodeParam(val)
}
}
func (e *encoder) encodeParam(val reflect.Value) {
if e.isNil(val) {
return
}
fmt.Fprint(e, "<param>")
e.encodeValue(val)
fmt.Fprint(e, "</param>")
}
// TODO: base64
func (e *encoder) encodeValue(val reflect.Value) {
if val.Kind() == reflect.Ptr || val.Kind() == reflect.Interface {
val = val.Elem()
}
fmt.Fprint(e, "<value>")
switch val.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
fmt.Fprintf(e, "<int>%d</int>", val.Int())
case reflect.Bool:
var n int
if val.Bool() {
n = 1
} else {
n = 0
}
fmt.Fprintf(e, "<boolean>%d</boolean>", n)
case reflect.String:
fmt.Fprint(e, "<string>")
xml.Escape(e, []byte(val.String()))
fmt.Fprint(e, "</string>")
case reflect.Float32, reflect.Float64:
fmt.Fprintf(e, "<double>%f</double>", val.Float())
case reflect.Struct:
if t, isTime := val.Interface().(time.Time); isTime {
fmt.Fprintf(e, "<dateTime.iso8601>%s</dateTime.iso8601>", t.Format(iso8601))
} else {
e.encodeStruct(val)
}
case reflect.Slice:
e.encodeSlice(val)
}
fmt.Fprint(e, "</value>")
}
func (e *encoder) encodeStruct(val reflect.Value) {
fmt.Fprint(e, "<struct>")
t := val.Type()
for i := 0; i < t.NumField(); i++ {
f := t.Field(i)
v := val.FieldByName(f.Name)
if e.isNil(v) {
continue
}
fmt.Fprintf(e, "<member>")
name := f.Tag.Get("xmlrpc")
if name == "" {
name = f.Name
}
fmt.Fprintf(e, "<name>%s</name>", name)
e.encodeValue(v)
fmt.Fprintf(e, "</member>")
}
fmt.Fprint(e, "</struct>")
}
func (e *encoder) encodeSlice(val reflect.Value) {
fmt.Fprint(e, "<array><data>")
for i := 0; i < val.Len(); i++ {
v := val.Index(i)
if e.isNil(v) {
continue
}
e.encodeValue(v)
}
fmt.Fprint(e, "</data></array>")
}
func (_ *encoder) isNil(val reflect.Value) bool {
return (val.Kind() == reflect.Ptr || val.Kind() == reflect.Interface) && val.IsNil()
}