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tsfm_urlencoded.go
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/
tsfm_urlencoded.go
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package transformer
import (
"context"
"io"
"net/textproto"
"net/url"
"reflect"
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/reflectx"
"github.com/machinefi/w3bstream/pkg/depends/x/typesx"
)
func init() { DefaultFactory.Register(&URLEncoded{}) }
/*
URLEncoded for application/x-www-form-urlencoded
var s = struct {
Username string `name:"username"`
Nickname string `name:"username,omitempty"`
Tags []string `name:"tag"`
}{
Username: "name",
Tags: []string{"1","2"},
}
will transform to
username=name&tag=1&tag=2
*/
type URLEncoded struct{ *FlattenParams }
func (URLEncoded) Names() []string {
return []string{httpx.MIME_FORM_URLENCODED, "form", "urlencoded", "url-encoded"}
}
func (t URLEncoded) String() string { return httpx.MIME_FORM_URLENCODED }
func (URLEncoded) NamedByTag() string { return "name" }
func (URLEncoded) New(ctx context.Context, typ typesx.Type) (Transformer, error) {
tsf := &URLEncoded{}
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 *URLEncoded) EncodeTo(ctx context.Context, w io.Writer, v interface{}) error {
rv, ok := v.(reflect.Value)
if !ok {
rv = reflect.ValueOf(v)
}
rv = reflectx.Indirect(rv)
values := url.Values{}
errs := vldterr.NewErrorSet()
for i := range t.Params {
p := t.Params[i]
if p.Tsf != nil {
field := p.FieldValue(rv)
builders := NewStringBuilders()
if err := NewSuper(p.Tsf, &p.Option.CommonOption).
EncodeTo(ctx, builders, field); err != nil {
errs.AddErr(err, p.Name)
continue
}
values[p.Name] = builders.StringSlice()
}
}
if err := errs.Err(); err != nil {
return err
}
httpx.MaybeWriteHeader(
ctx, w, t.Names()[0],
map[string]string{
"param": "value",
},
)
_, err := w.Write([]byte(values.Encode()))
return err
}
func (t *URLEncoded) DecodeFrom(ctx context.Context, r io.Reader, v interface{}, headers ...textproto.MIMEHeader) error {
rv, ok := v.(reflect.Value)
if !ok {
rv = reflect.ValueOf(v)
}
if rv.Kind() != reflect.Ptr {
return pkgerr.New("decode target must be ptr value")
}
data, err := io.ReadAll(r)
if err != nil {
return err
}
values, err := url.ParseQuery(string(data))
if err != nil {
return err
}
errs := vldterr.NewErrorSet()
for i := range t.Params {
p := t.Params[i]
fvs := values[p.Name]
if p.Tsf == nil || len(fvs) == 0 {
continue
}
if err := NewSuper(p.Tsf, &p.Option.CommonOption).
DecodeFrom(ctx, NewStringReaders(fvs), p.FieldValue(rv).Addr()); err != nil {
errs.AddErr(err, p.Name)
continue
}
}
return errs.Err()
}