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tsfm_octet_stream.go
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tsfm_octet_stream.go
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package transformer
import (
"bytes"
"context"
"io"
"mime/multipart"
"net/textproto"
"reflect"
"github.com/machinefi/w3bstream/pkg/depends/kit/httptransport/httpx"
"github.com/machinefi/w3bstream/pkg/depends/x/typesx"
)
func init() { DefaultFactory.Register(&OctetStream{}) }
type OctetStream struct{}
func (t *OctetStream) String() string { return httpx.MIME_OCTET_STREAM }
func (OctetStream) Names() []string {
return []string{httpx.MIME_OCTET_STREAM, "stream", "octet-stream"}
}
func (OctetStream) New(context.Context, typesx.Type) (Transformer, error) { return &OctetStream{}, nil }
func (t *OctetStream) EncodeTo(ctx context.Context, w io.Writer, v interface{}) error {
rv, ok := v.(reflect.Value)
if ok {
v = rv.Interface()
}
switch x := v.(type) {
case io.Reader:
httpx.MaybeWriteHeader(ctx, w, t.Names()[0], nil)
if _, err := io.Copy(w, x); err != nil {
return err
}
case bytes.Buffer:
// TODO draft for fix bytes.Buffer
httpx.MaybeWriteHeader(ctx, w, t.Names()[0], nil)
if _, err := io.Copy(w, &x); err != nil {
return err
}
case *multipart.FileHeader:
file, err := x.Open()
if err != nil {
return err
}
defer file.Close()
if rw, ok := w.(httpx.WithHeader); ok {
for k := range x.Header {
rw.Header()[k] = x.Header[k]
}
}
if _, err := io.Copy(w, file); err != nil {
return err
}
}
return nil
}
func (OctetStream) DecodeFrom(_ context.Context, r io.Reader, v interface{}, _ ...textproto.MIMEHeader) error {
rv, ok := v.(reflect.Value)
if ok {
v = rv.Interface()
}
switch x := v.(type) {
case io.Writer:
if _, err := io.Copy(x, r); err != nil {
return err
}
case *multipart.FileHeader:
if with, ok := r.(CanInterface); ok {
if fh, ok := with.Interface().(*multipart.FileHeader); ok {
*x = *fh
}
}
case **multipart.FileHeader:
if with, ok := r.(CanInterface); ok {
if fh, ok := with.Interface().(*multipart.FileHeader); ok {
*x = fh
}
}
}
return nil
}