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file.go
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file.go
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package request
import (
"errors"
"fmt"
"mime/multipart"
"net/http"
"reflect"
"github.com/swaggest/rest"
"github.com/valyala/fasthttp"
)
var (
multipartFileType = reflect.TypeOf((*multipart.File)(nil)).Elem()
multipartFilesType = reflect.TypeOf(([]multipart.File)(nil))
multipartFileHeaderType = reflect.TypeOf((*multipart.FileHeader)(nil))
multipartFileHeadersType = reflect.TypeOf(([]*multipart.FileHeader)(nil))
)
func decodeFiles(rc *fasthttp.RequestCtx, input interface{}, _ rest.Validator) error {
v := reflect.ValueOf(input)
return decodeFilesInStruct(rc, v)
}
func decodeFilesInStruct(rc *fasthttp.RequestCtx, v reflect.Value) error {
for v.Kind() == reflect.Ptr {
v = v.Elem()
}
if v.Kind() != reflect.Struct {
return nil
}
t := v.Type()
for i := 0; i < t.NumField(); i++ {
field := t.Field(i)
if field.Type == multipartFileType || field.Type == multipartFileHeaderType ||
field.Type == multipartFilesType || field.Type == multipartFileHeadersType {
err := setFile(rc, field, v.Field(i))
if err != nil {
return err
}
continue
}
if field.Anonymous {
if err := decodeFilesInStruct(rc, v.Field(i)); err != nil {
return err
}
}
}
return nil
}
// nolint:funlen // Maybe later.
func setFile(rc *fasthttp.RequestCtx, field reflect.StructField, v reflect.Value) error {
name := ""
if tag := field.Tag.Get(fileTag); tag != "" && tag != "-" {
name = tag
} else if tag := field.Tag.Get(formDataTag); tag != "" && tag != "-" {
name = tag
}
if name == "" {
return nil
}
header, err := rc.FormFile(name)
if err != nil {
if errors.Is(err, http.ErrMissingFile) {
if field.Tag.Get("required") == "true" {
return fmt.Errorf("%w: %q", ErrMissingRequiredFile, name)
}
}
return fmt.Errorf("failed to get file %q from request: %w", name, err)
}
if field.Type == multipartFileType {
file, err := header.Open()
if err != nil {
return fmt.Errorf("failed to open file %q from request: %w", name, err)
}
v.Set(reflect.ValueOf(file))
}
if field.Type == multipartFileHeaderType {
v.Set(reflect.ValueOf(header))
}
if field.Type == multipartFilesType {
mf, err := rc.MultipartForm()
if err != nil {
return fmt.Errorf("failed to get multipart form from request: %w", err)
}
res := make([]multipart.File, 0, len(mf.File[name]))
for _, h := range mf.File[name] {
f, err := h.Open()
if err != nil {
return fmt.Errorf("failed to open uploaded file %s (%s): %w", name, h.Filename, err)
}
res = append(res, f)
}
v.Set(reflect.ValueOf(res))
}
if field.Type == multipartFileHeadersType {
mf, err := rc.MultipartForm()
if err != nil {
return fmt.Errorf("failed to get multipart form from request: %w", err)
}
v.Set(reflect.ValueOf(mf.File[name]))
}
return nil
}