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binding: add support of multipart multi files (#1878) (#1949) 

* binding: add support of multipart multi files (#1878)

* update readme: add multipart file binding
This commit is contained in:
Dmitry Kutakov 2019-06-18 14:49:10 +03:00 committed by 田欧
parent 75b9d2bed7
commit 09a3650c97
4 changed files with 225 additions and 43 deletions
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38
README.md
View File

@ -959,32 +959,36 @@ result:
### Multipart/Urlencoded binding
```go
package main
type ProfileForm struct {
Name string `form:"name" binding:"required"`
Avatar *multipart.FileHeader `form:"avatar" binding:"required"`
import (
"github.com/gin-gonic/gin"
)
type LoginForm struct {
User string `form:"user" binding:"required"`
Password string `form:"password" binding:"required"`
// or for multiple files
// Avatars []*multipart.FileHeader `form:"avatar" binding:"required"`
}
func main() {
router := gin.Default()
router.POST("/login", func(c *gin.Context) {
router.POST("/profile", func(c *gin.Context) {
// you can bind multipart form with explicit binding declaration:
// c.ShouldBindWith(&form, binding.Form)
// or you can simply use autobinding with ShouldBind method:
var form LoginForm
var form ProfileForm
// in this case proper binding will be automatically selected
if c.ShouldBind(&form) == nil {
if form.User == "user" && form.Password == "password" {
c.JSON(200, gin.H{"status": "you are logged in"})
} else {
c.JSON(401, gin.H{"status": "unauthorized"})
}
if err := c.ShouldBind(&form); err != nil {
c.String(http.StatusBadRequest, "bad request")
return
}
err := c.SaveUploadedFile(form.Avatar, form.Avatar.Filename)
if err != nil {
c.String(http.StatusInternalServerError, "unknown error")
return
}
// db.Save(&form)
c.String(http.StatusOK, "ok")
})
router.Run(":8080")
}
@ -992,7 +996,7 @@ func main() {
Test it with:
```sh
$ curl -v --form user=user --form password=password http://localhost:8080/login
$ curl -X POST -v --form name=user --form "avatar=@./avatar.png" http://localhost:8080/profile
```
### XML, JSON, YAML and ProtoBuf rendering

26
binding/form.go
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@ -5,9 +5,7 @@
package binding
import (
"mime/multipart"
"net/http"
"reflect"
)
const defaultMemory = 32 * 1024 * 1024
@ -63,27 +61,3 @@ func (formMultipartBinding) Bind(req *http.Request, obj interface{}) error {
return validate(obj)
}
type multipartRequest http.Request
var _ setter = (*multipartRequest)(nil)
var (
multipartFileHeaderStructType = reflect.TypeOf(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) (isSetted bool, err error) {
if value.Type() == multipartFileHeaderStructType {
_, file, err := (*http.Request)(r).FormFile(key)
if err != nil {
return false, err
}
if file != nil {
value.Set(reflect.ValueOf(*file))
return true, nil
}
}
return setByForm(value, field, r.MultipartForm.Value, key, opt)
}

66
binding/multipart_form_mapping.go Normal file
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@ -0,0 +1,66 @@
// 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)
// 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) (isSetted bool, err 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) (isSetted 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))
isSetted, err = setArrayOfMultipartFormFiles(slice, field, files)
if err != nil || !isSetted {
return isSetted, err
}
value.Set(slice)
return true, nil
case reflect.Array:
return setArrayOfMultipartFormFiles(value, field, files)
}
return false, errors.New("unsupported field type for multipart.FileHeader")
}
func setArrayOfMultipartFormFiles(value reflect.Value, field reflect.StructField, files []*multipart.FileHeader) (isSetted bool, err error) {
if value.Len() != len(files) {
return false, errors.New("unsupported len of array for []*multipart.FileHeader")
}
for i := range files {
setted, err := setByMultipartFormFile(value.Index(i), field, files[i:i+1])
if err != nil || !setted {
return setted, err
}
}
return true, nil
}

138
binding/multipart_form_mapping_test.go Normal file
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@ -0,0 +1,138 @@
// 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 (
"bytes"
"io/ioutil"
"mime/multipart"
"net/http"
"testing"
"github.com/stretchr/testify/assert"
)
func TestFormMultipartBindingBindOneFile(t *testing.T) {
var s struct {
FileValue multipart.FileHeader `form:"file"`
FilePtr *multipart.FileHeader `form:"file"`
SliceValues []multipart.FileHeader `form:"file"`
SlicePtrs []*multipart.FileHeader `form:"file"`
ArrayValues [1]multipart.FileHeader `form:"file"`
ArrayPtrs [1]*multipart.FileHeader `form:"file"`
}
file := testFile{"file", "file1", []byte("hello")}
req := createRequestMultipartFiles(t, file)
err := FormMultipart.Bind(req, &s)
assert.NoError(t, err)
assertMultipartFileHeader(t, &s.FileValue, file)
assertMultipartFileHeader(t, s.FilePtr, file)
assert.Len(t, s.SliceValues, 1)
assertMultipartFileHeader(t, &s.SliceValues[0], file)
assert.Len(t, s.SlicePtrs, 1)
assertMultipartFileHeader(t, s.SlicePtrs[0], file)
assertMultipartFileHeader(t, &s.ArrayValues[0], file)
assertMultipartFileHeader(t, s.ArrayPtrs[0], file)
}
func TestFormMultipartBindingBindTwoFiles(t *testing.T) {
var s struct {
SliceValues []multipart.FileHeader `form:"file"`
SlicePtrs []*multipart.FileHeader `form:"file"`
ArrayValues [2]multipart.FileHeader `form:"file"`
ArrayPtrs [2]*multipart.FileHeader `form:"file"`
}
files := []testFile{
{"file", "file1", []byte("hello")},
{"file", "file2", []byte("world")},
}
req := createRequestMultipartFiles(t, files...)
err := FormMultipart.Bind(req, &s)
assert.NoError(t, err)
assert.Len(t, s.SliceValues, len(files))
assert.Len(t, s.SlicePtrs, len(files))
assert.Len(t, s.ArrayValues, len(files))
assert.Len(t, s.ArrayPtrs, len(files))
for i, file := range files {
assertMultipartFileHeader(t, &s.SliceValues[i], file)
assertMultipartFileHeader(t, s.SlicePtrs[i], file)
assertMultipartFileHeader(t, &s.ArrayValues[i], file)
assertMultipartFileHeader(t, s.ArrayPtrs[i], file)
}
}
func TestFormMultipartBindingBindError(t *testing.T) {
files := []testFile{
{"file", "file1", []byte("hello")},
{"file", "file2", []byte("world")},
}
for _, tt := range []struct {
name string
s interface{}
}{
{"wrong type", &struct {
Files int `form:"file"`
}{}},
{"wrong array size", &struct {
Files [1]*multipart.FileHeader `form:"file"`
}{}},
{"wrong slice type", &struct {
Files []int `form:"file"`
}{}},
} {
req := createRequestMultipartFiles(t, files...)
err := FormMultipart.Bind(req, tt.s)
assert.Error(t, err)
}
}
type testFile struct {
Fieldname string
Filename string
Content []byte
}
func createRequestMultipartFiles(t *testing.T, files ...testFile) *http.Request {
var body bytes.Buffer
mw := multipart.NewWriter(&body)
for _, file := range files {
fw, err := mw.CreateFormFile(file.Fieldname, file.Filename)
assert.NoError(t, err)
n, err := fw.Write(file.Content)
assert.NoError(t, err)
assert.Equal(t, len(file.Content), n)
}
err := mw.Close()
assert.NoError(t, err)
req, err := http.NewRequest("POST", "/", &body)
assert.NoError(t, err)
req.Header.Set("Content-Type", MIMEMultipartPOSTForm+"; boundary="+mw.Boundary())
return req
}
func assertMultipartFileHeader(t *testing.T, fh *multipart.FileHeader, file testFile) {
assert.Equal(t, file.Filename, fh.Filename)
// assert.Equal(t, int64(len(file.Content)), fh.Size) // fh.Size does not exist on go1.8
fl, err := fh.Open()
assert.NoError(t, err)
body, err := ioutil.ReadAll(fl)
assert.NoError(t, err)
assert.Equal(t, string(file.Content), string(body))
err = fl.Close()
assert.NoError(t, err)
}