mirror of
https://github.com/cwinfo/matterbridge.git
synced 2024-11-25 03:01:36 +00:00
102 lines
2.6 KiB
Go
102 lines
2.6 KiB
Go
/*
|
|
Package multipartstreamer helps you encode large files in MIME multipart format
|
|
without reading the entire content into memory. It uses io.MultiReader to
|
|
combine an inner multipart.Reader with a file handle.
|
|
*/
|
|
package multipartstreamer
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"io"
|
|
"io/ioutil"
|
|
"mime/multipart"
|
|
"net/http"
|
|
"os"
|
|
"path/filepath"
|
|
)
|
|
|
|
type MultipartStreamer struct {
|
|
ContentType string
|
|
bodyBuffer *bytes.Buffer
|
|
bodyWriter *multipart.Writer
|
|
closeBuffer *bytes.Buffer
|
|
reader io.Reader
|
|
contentLength int64
|
|
}
|
|
|
|
// New initializes a new MultipartStreamer.
|
|
func New() (m *MultipartStreamer) {
|
|
m = &MultipartStreamer{bodyBuffer: new(bytes.Buffer)}
|
|
|
|
m.bodyWriter = multipart.NewWriter(m.bodyBuffer)
|
|
boundary := m.bodyWriter.Boundary()
|
|
m.ContentType = "multipart/form-data; boundary=" + boundary
|
|
|
|
closeBoundary := fmt.Sprintf("\r\n--%s--\r\n", boundary)
|
|
m.closeBuffer = bytes.NewBufferString(closeBoundary)
|
|
|
|
return
|
|
}
|
|
|
|
// WriteFields writes multiple form fields to the multipart.Writer.
|
|
func (m *MultipartStreamer) WriteFields(fields map[string]string) error {
|
|
var err error
|
|
|
|
for key, value := range fields {
|
|
err = m.bodyWriter.WriteField(key, value)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// WriteReader adds an io.Reader to get the content of a file. The reader is
|
|
// not accessed until the multipart.Reader is copied to some output writer.
|
|
func (m *MultipartStreamer) WriteReader(key, filename string, size int64, reader io.Reader) (err error) {
|
|
m.reader = reader
|
|
m.contentLength = size
|
|
|
|
_, err = m.bodyWriter.CreateFormFile(key, filename)
|
|
return
|
|
}
|
|
|
|
// WriteFile is a shortcut for adding a local file as an io.Reader.
|
|
func (m *MultipartStreamer) WriteFile(key, filename string) error {
|
|
fh, err := os.Open(filename)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
stat, err := fh.Stat()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return m.WriteReader(key, filepath.Base(filename), stat.Size(), fh)
|
|
}
|
|
|
|
// SetupRequest sets up the http.Request body, and some crucial HTTP headers.
|
|
func (m *MultipartStreamer) SetupRequest(req *http.Request) {
|
|
req.Body = m.GetReader()
|
|
req.Header.Add("Content-Type", m.ContentType)
|
|
req.ContentLength = m.Len()
|
|
}
|
|
|
|
func (m *MultipartStreamer) Boundary() string {
|
|
return m.bodyWriter.Boundary()
|
|
}
|
|
|
|
// Len calculates the byte size of the multipart content.
|
|
func (m *MultipartStreamer) Len() int64 {
|
|
return m.contentLength + int64(m.bodyBuffer.Len()) + int64(m.closeBuffer.Len())
|
|
}
|
|
|
|
// GetReader gets an io.ReadCloser for passing to an http.Request.
|
|
func (m *MultipartStreamer) GetReader() io.ReadCloser {
|
|
reader := io.MultiReader(m.bodyBuffer, m.reader, m.closeBuffer)
|
|
return ioutil.NopCloser(reader)
|
|
}
|