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tsfm_multipart.go
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/
tsfm_multipart.go
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package transformer
import (
"bytes"
"context"
"fmt"
"io"
"mime"
"mime/multipart"
"net/http"
"net/textproto"
"reflect"
"strconv"
pkgerr "github.com/pkg/errors"
"github.com/machinefi/w3bstream/pkg/depends/kit/httptransport/httpx"
vldterr "github.com/machinefi/w3bstream/pkg/depends/kit/validator/errors"
"github.com/machinefi/w3bstream/pkg/depends/x/typesx"
)
func init() { DefaultFactory.Register(&Multipart{}) }
// Multipart for multipart/form-data
type Multipart struct{ *FlattenParams }
func (Multipart) Names() []string {
return []string{httpx.MIME_MULTIPART_FORMDAT, "multipart", "form-data"}
}
func (Multipart) NamedByTag() string { return "name" }
func (t *Multipart) String() string { return httpx.MIME_MULTIPART_FORMDAT }
func (Multipart) New(ctx context.Context, typ typesx.Type) (Transformer, error) {
tsf := &Multipart{}
typ = typesx.DeRef(typ)
if typ.Kind() != reflect.Struct {
return nil, pkgerr.Errorf(
"content transformer `%s` should be used for struct type",
tsf,
)
}
tsf.FlattenParams = &FlattenParams{}
if err := tsf.FlattenParams.CollectParams(ctx, typ); err != nil {
return nil, err
}
return tsf, nil
}
func (t *Multipart) EncodeTo(ctx context.Context, w io.Writer, v interface{}) error {
rv, ok := v.(reflect.Value)
if !ok {
rv = reflect.ValueOf(v)
}
writer := multipart.NewWriter(w)
httpx.MaybeWriteHeader(ctx, w, writer.FormDataContentType(), nil)
errs := vldterr.NewErrorSet()
for i := range t.Params {
p := t.Params[i]
fv := p.FieldValue(rv)
if p.Tsf != nil {
st := NewSuper(p.Tsf, &p.Option.CommonOption)
pw := NewFormPartWriter(
func(header textproto.MIMEHeader) (io.Writer, error) {
filename := ""
if hv := header.Get(httpx.HeaderContentDisposition); hv != "" {
_, disposition, err := mime.ParseMediaType(hv)
if err == nil {
if f, exists := disposition["filename"]; exists {
filename = fmt.Sprintf("; filename=%s", strconv.Quote(f))
}
}
}
// always overwrite name
header.Set(
httpx.HeaderContentDisposition,
fmt.Sprintf(
"form-data; name=%s%s",
strconv.Quote(p.Name),
filename,
),
)
return writer.CreatePart(header)
},
)
if err := st.EncodeTo(ctx, pw, fv); err != nil {
errs.AddErr(err, p.Name)
continue
}
}
}
return writer.Close()
}
const dftMaxMemory = 32 << 20 // 32 MB
func (t *Multipart) DecodeFrom(ctx context.Context, r io.Reader, v interface{}, headers ...textproto.MIMEHeader) error {
rv, ok := v.(reflect.Value)
if !ok {
rv = reflect.ValueOf(v)
}
header := MIMEHeader(headers...)
_, params, err := mime.ParseMediaType(header.Get(httpx.HeaderContentType))
if err != nil {
return err
}
reader := multipart.NewReader(r, params["boundary"])
form, err := reader.ReadForm(dftMaxMemory)
if err != nil {
return err
}
errs := vldterr.NewErrorSet()
for i := range t.Params {
p := t.Params[i]
if p.Tsf == nil {
continue
}
tsf := NewSuper(p.Tsf, &p.Option.CommonOption)
if files, ok := form.File[p.Name]; ok {
readers := NewFileHeaderReaders(files)
if err := tsf.DecodeFrom(ctx, readers, p.FieldValue(rv).Addr()); err != nil {
errs.AddErr(err, p.Name)
}
continue
}
if fvs, ok := form.Value[p.Name]; ok {
readers := NewStringReaders(fvs)
if err := tsf.DecodeFrom(ctx, readers, p.FieldValue(rv).Addr()); err != nil {
errs.AddErr(err, p.Name)
}
}
}
return nil
}
func MustNewFileHeader(fieldName string, filename string, r io.Reader) *multipart.FileHeader {
header, err := NewFileHeader(fieldName, filename, r)
if err != nil {
panic(err)
}
return header
}
func NewFileHeader(fieldName string, filename string, r io.Reader) (*multipart.FileHeader, error) {
buffer := bytes.NewBuffer(nil)
mpw := multipart.NewWriter(buffer)
part, err := mpw.CreateFormFile(fieldName, filename)
if err != nil {
return nil, err
}
if _, err := io.Copy(part, r); err != nil {
return nil, err
}
mpw.Close()
reader := multipart.NewReader(buffer, mpw.Boundary())
form, err := reader.ReadForm(int64(buffer.Len()))
if err != nil {
return nil, err
}
return form.File[fieldName][0], nil
}
type PartWriterCreator func(header textproto.MIMEHeader) (io.Writer, error)
func NewFormPartWriter(creator PartWriterCreator) *FormPartWriter {
return &FormPartWriter{
creator: creator,
header: http.Header{},
}
}
type FormPartWriter struct {
creator PartWriterCreator
wr io.Writer
header http.Header
}
func (w *FormPartWriter) NextWriter() io.Writer { return NewFormPartWriter(w.creator) }
func (w *FormPartWriter) Header() http.Header { return w.header }
func (w *FormPartWriter) Write(p []byte) (n int, err error) {
if w.wr == nil {
w.wr, err = w.creator(textproto.MIMEHeader(w.header))
if err != nil {
return -1, err
}
}
return w.wr.Write(p)
}
func NewFileHeaderReaders(headers []*multipart.FileHeader) *StringReaders {
bs := make([]io.Reader, len(headers))
for i := range headers {
bs[i] = &FileHeaderReader{v: headers[i]}
}
return &StringReaders{
readers: bs,
}
}
type FileHeaderReader struct {
v *multipart.FileHeader
opened multipart.File
}
func (f *FileHeaderReader) Interface() interface{} { return f.v }
func (f *FileHeaderReader) Read(p []byte) (int, error) {
if f.opened == nil {
file, err := f.v.Open()
if err != nil {
return -1, err
}
f.opened = file
}
n, err := f.opened.Read(p)
if err == io.EOF {
return n, f.opened.Close()
}
return n, err
}