update for supporting file binding

binding/binding.go

@@ -69,6 +69,8 @@ func Default(method, contentType string) Binding {
 		return ProtoBuf
 	case MIMEMSGPACK, MIMEMSGPACK2:
 		return MsgPack
+	case MIMEMultipartPOSTForm:
+		return FormMultipart
 	default: //case MIMEPOSTForm, MIMEMultipartPOSTForm:
 		return Form
 	}

binding/form.go

@@ -52,5 +52,10 @@ func (formMultipartBinding) Bind(req *http.Request, obj interface{}) error {
 	if err := mapForm(obj, req.MultipartForm.Value); err != nil {
 		return err
 	}
+
+	if err := mapFiles(obj, req); err != nil {
+		return err
+	}
+
 	return validate(obj)
 }

binding/form_mapping.go

@@ -6,11 +6,47 @@ package binding
 
 import (
 	"errors"
+	"fmt"
+	"io/ioutil"
+	"net/http"
 	"reflect"
 	"strconv"
 	"time"
 )
 
+func mapFiles(ptr interface{}, req *http.Request) error {
+	typ := reflect.TypeOf(ptr).Elem()
+	val := reflect.ValueOf(ptr).Elem()
+	for i := 0; i < typ.NumField(); i++ {
+		typeField := typ.Field(i)
+		structField := val.Field(i)
+
+		t := fmt.Sprintf("%s", typeField.Type)
+		if string(t) != "[]uint8" {
+			continue
+		}
+
+		inputFieldName := typeField.Tag.Get("form")
+		if inputFieldName == "" {
+			inputFieldName = typeField.Name
+		}
+
+		file, _, err := req.FormFile(inputFieldName)
+		if err != nil {
+			return err
+		}
+
+		data, err := ioutil.ReadAll(file)
+		if err != nil {
+			return err
+		}
+
+		structField.SetBytes(data)
+
+	}
+	return nil
+}
+
 func mapForm(ptr interface{}, form map[string][]string) error {
 	typ := reflect.TypeOf(ptr).Elem()
 	val := reflect.ValueOf(ptr).Elem()