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MMAEncoder.go
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MMAEncoder.go
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package soap
import (
"bytes"
"encoding/xml"
"errors"
"fmt"
"io"
"io/ioutil"
"mime"
"mime/multipart"
"net/textproto"
"strings"
)
const mmaContentType string = `multipart/related; start="<soaprequest@gowsdl.lib>"; type="text/xml"; boundary="%s"`
type mmaEncoder struct {
writer *multipart.Writer
attachments []MIMEMultipartAttachment
}
type mmaDecoder struct {
reader *multipart.Reader
}
func newMmaEncoder(w io.Writer, attachments []MIMEMultipartAttachment) *mmaEncoder {
return &mmaEncoder{
writer: multipart.NewWriter(w),
attachments: attachments,
}
}
func newMmaDecoder(r io.Reader, boundary string) *mmaDecoder {
return &mmaDecoder{
reader: multipart.NewReader(r, boundary),
}
}
func (e *mmaEncoder) Encode(v interface{}) error {
var err error
var soapPartWriter io.Writer
// 1. write SOAP envelope part
headers := make(textproto.MIMEHeader)
headers.Set("Content-Type", `text/xml;charset=UTF-8`)
headers.Set("Content-Transfer-Encoding", "8bit")
headers.Set("Content-ID", "<soaprequest@gowsdl.lib>")
if soapPartWriter, err = e.writer.CreatePart(headers); err != nil {
return err
}
xmlEncoder := xml.NewEncoder(soapPartWriter)
if err := xmlEncoder.Encode(v); err != nil {
return err
}
// 2. write attachments parts
for _, attachment := range e.attachments {
attHeader := make(textproto.MIMEHeader)
attHeader.Set("Content-Type", fmt.Sprintf("application/octet-stream; name=%s", attachment.Name))
attHeader.Set("Content-Transfer-Encoding", "binary")
attHeader.Set("Content-ID", fmt.Sprintf("<%s>", attachment.Name))
attHeader.Set("Content-Disposition",
fmt.Sprintf("attachment; name=\"%s\"; filename=\"%s\"", attachment.Name, attachment.Name))
var attachmentPartWriter io.Writer
attachmentPartWriter, err := e.writer.CreatePart(attHeader)
if err != nil {
return err
}
_, err = io.Copy(attachmentPartWriter, bytes.NewReader(attachment.Data))
if err != nil {
return err
}
}
return nil
}
func (e *mmaEncoder) Flush() error {
return e.writer.Close()
}
func (e *mmaEncoder) Boundary() string {
return e.writer.Boundary()
}
func getMmaHeader(contentType string) (string, error) {
mediaType, params, err := mime.ParseMediaType(contentType)
if err != nil {
return "", err
}
if strings.HasPrefix(mediaType, "multipart/") {
boundary, ok := params["boundary"]
if !ok || boundary == "" {
return "", fmt.Errorf("invalid multipart boundary: %s", boundary)
}
startInfo, ok := params["start"]
if !ok || startInfo != "<soaprequest@gowsdl.lib>" {
return "", fmt.Errorf(`expected param start="<soaprequest@gowsdl.lib>", got %s`, startInfo)
}
return boundary, nil
}
return "", nil
}
func (d *mmaDecoder) Decode(v interface{}) error {
soapEnvResp := v.(*SOAPEnvelopeResponse)
attachments := make([]MIMEMultipartAttachment, 0)
for {
p, err := d.reader.NextPart()
if err != nil {
if err == io.EOF {
break
}
return err
}
contentType := p.Header.Get("Content-Type")
if contentType == "text/xml;charset=UTF-8" {
// decode SOAP part
err := xml.NewDecoder(p).Decode(v)
if err != nil {
return err
}
} else {
// decode attachment parts
contentID := p.Header.Get("Content-Id")
if contentID == "" {
return errors.New("Invalid multipart content ID")
}
content, err := ioutil.ReadAll(p)
if err != nil {
return err
}
contentID = strings.Trim(contentID, "<>")
attachments = append(attachments, MIMEMultipartAttachment{
Name: contentID,
Data: content,
})
}
}
if len(attachments) > 0 {
soapEnvResp.Attachments = attachments
}
return nil
}