/
multipart.go
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/
multipart.go
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/*
* Copyright 2022 CloudWeGo Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* The MIT License (MIT)
*
* Copyright (c) 2015-present Aliaksandr Valialkin, VertaMedia, Kirill Danshin, Erik Dubbelboer, FastHTTP Authors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* This file may have been modified by CloudWeGo authors. All CloudWeGo
* Modifications are Copyright 2022 CloudWeGo Authors.
*/
package protocol
import (
"fmt"
"io"
"mime/multipart"
"net/http"
"net/textproto"
"os"
"path/filepath"
"strings"
"github.com/cloudwego/hertz/pkg/common/bytebufferpool"
"github.com/cloudwego/hertz/pkg/common/utils"
"github.com/cloudwego/hertz/pkg/network"
"github.com/cloudwego/hertz/pkg/protocol/consts"
)
func ReadMultipartForm(r io.Reader, boundary string, size, maxInMemoryFileSize int) (*multipart.Form, error) {
// Do not care about memory allocations here, since they are tiny
// compared to multipart data (aka multi-MB files) usually sent
// in multipart/form-data requests.
if size <= 0 {
return nil, fmt.Errorf("form size must be greater than 0. Given %d", size)
}
lr := io.LimitReader(r, int64(size))
mr := multipart.NewReader(lr, boundary)
f, err := mr.ReadForm(int64(maxInMemoryFileSize))
if err != nil {
return nil, fmt.Errorf("cannot read multipart/form-data body: %s", err)
}
return f, nil
}
// WriteMultipartForm writes the given multipart form f with the given
// boundary to w.
func WriteMultipartForm(w io.Writer, f *multipart.Form, boundary string) error {
// Do not care about memory allocations here, since multipart
// form processing is slow.
if len(boundary) == 0 {
panic("BUG: form boundary cannot be empty")
}
mw := multipart.NewWriter(w)
if err := mw.SetBoundary(boundary); err != nil {
return fmt.Errorf("cannot use form boundary %q: %s", boundary, err)
}
// marshal values
for k, vv := range f.Value {
for _, v := range vv {
if err := mw.WriteField(k, v); err != nil {
return fmt.Errorf("cannot write form field %q value %q: %s", k, v, err)
}
}
}
// marshal files
for k, fvv := range f.File {
for _, fv := range fvv {
vw, err := mw.CreatePart(fv.Header)
zw := network.NewWriter(vw)
if err != nil {
return fmt.Errorf("cannot create form file %q (%q): %s", k, fv.Filename, err)
}
fh, err := fv.Open()
if err != nil {
return fmt.Errorf("cannot open form file %q (%q): %s", k, fv.Filename, err)
}
if _, err = utils.CopyZeroAlloc(zw, fh); err != nil {
return fmt.Errorf("error when copying form file %q (%q): %s", k, fv.Filename, err)
}
if err = fh.Close(); err != nil {
return fmt.Errorf("cannot close form file %q (%q): %s", k, fv.Filename, err)
}
}
}
if err := mw.Close(); err != nil {
return fmt.Errorf("error when closing multipart form writer: %s", err)
}
return nil
}
func MarshalMultipartForm(f *multipart.Form, boundary string) ([]byte, error) {
var buf bytebufferpool.ByteBuffer
if err := WriteMultipartForm(&buf, f, boundary); err != nil {
return nil, err
}
return buf.B, nil
}
func WriteMultipartFormFile(w *multipart.Writer, fieldName, fileName string, r io.Reader) error {
// Auto detect actual multipart content type
cbuf := make([]byte, 512)
size, err := r.Read(cbuf)
if err != nil && err != io.EOF {
return err
}
partWriter, err := w.CreatePart(CreateMultipartHeader(fieldName, fileName, http.DetectContentType(cbuf[:size])))
if err != nil {
return err
}
if _, err = partWriter.Write(cbuf[:size]); err != nil {
return err
}
_, err = io.Copy(partWriter, r)
return err
}
func CreateMultipartHeader(param, fileName, contentType string) textproto.MIMEHeader {
hdr := make(textproto.MIMEHeader)
var contentDispositionValue string
if len(strings.TrimSpace(fileName)) == 0 {
contentDispositionValue = fmt.Sprintf(`form-data; name="%s"`, param)
} else {
contentDispositionValue = fmt.Sprintf(`form-data; name="%s"; filename="%s"`,
param, fileName)
}
hdr.Set("Content-Disposition", contentDispositionValue)
if len(contentType) > 0 {
hdr.Set(consts.HeaderContentType, contentType)
}
return hdr
}
func AddFile(w *multipart.Writer, fieldName, path string) error {
file, err := os.Open(path)
if err != nil {
return err
}
defer file.Close()
return WriteMultipartFormFile(w, fieldName, filepath.Base(path), file)
}
func ParseMultipartForm(r io.Reader, request *Request, size, maxInMemoryFileSize int) error {
m, err := ReadMultipartForm(r, request.multipartFormBoundary, size, maxInMemoryFileSize)
if err != nil {
return err
}
request.multipartForm = m
return nil
}
func SetMultipartFormWithBoundary(req *Request, m *multipart.Form, boundary string) {
req.multipartForm = m
req.multipartFormBoundary = boundary
}