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// Copyright 2019 Gin Core Team. All rights reserved.
// Use of this source code is governed by a MIT style
// license that can be found in the LICENSE file.
package binding
import (
"errors"
"mime/multipart"
"net/http"
"reflect"
)
type multipartRequest http.Request
var _ setter = (*multipartRequest)(nil)
var (
// ErrMultiFileHeader multipart.FileHeader invalid
ErrMultiFileHeader = errors.New("unsupported field type for multipart.FileHeader")
// ErrMultiFileHeaderLenInvalid array for []*multipart.FileHeader len invalid
ErrMultiFileHeaderLenInvalid = errors.New("unsupported len of array for []*multipart.FileHeader")
)
// TrySet tries to set a value by the multipart request with the binding a form file
func (r *multipartRequest) TrySet(value reflect.Value, field reflect.StructField, key string, opt setOptions) (bool, error) {
if files := r.MultipartForm.File[key]; len(files) != 0 {
return setByMultipartFormFile(value, field, files)
}
return setByForm(value, field, r.MultipartForm.Value, key, opt)
}
func setByMultipartFormFile(value reflect.Value, field reflect.StructField, files []*multipart.FileHeader) (isSet bool, err error) {
switch value.Kind() {
case reflect.Ptr:
switch value.Interface().(type) {
case *multipart.FileHeader:
value.Set(reflect.ValueOf(files[0]))
return true, nil
}
case reflect.Struct:
switch value.Interface().(type) {
case multipart.FileHeader:
value.Set(reflect.ValueOf(*files[0]))
return true, nil
}
case reflect.Slice:
slice := reflect.MakeSlice(value.Type(), len(files), len(files))
isSet, err = setArrayOfMultipartFormFiles(slice, field, files)
if err != nil || !isSet {
return isSet, err
}
value.Set(slice)
return true, nil
case reflect.Array:
return setArrayOfMultipartFormFiles(value, field, files)
}
return false, ErrMultiFileHeader
}
func setArrayOfMultipartFormFiles(value reflect.Value, field reflect.StructField, files []*multipart.FileHeader) (isSet bool, err error) {
if value.Len() != len(files) {
return false, ErrMultiFileHeaderLenInvalid
}
for i := range files {
set, err := setByMultipartFormFile(value.Index(i), field, files[i:i+1])
if err != nil || !set {
return set, err
}
}
return true, nil
}
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