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multifilereader.go
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multifilereader.go
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package http
import (
"bytes"
"fmt"
"io"
"mime/multipart"
"net/textproto"
"net/url"
"sync"
files "github.com/jbenet/go-ipfs/commands/files"
)
// MultiFileReader reads from a `commands.File` (which can be a directory of files
// or a regular file) as HTTP multipart encoded data.
type MultiFileReader struct {
io.Reader
files files.File
currentFile io.Reader
buf bytes.Buffer
mpWriter *multipart.Writer
closed bool
mutex *sync.Mutex
// if true, the data will be type 'multipart/form-data'
// if false, the data will be type 'multipart/mixed'
form bool
}
// NewMultiFileReader constructs a MultiFileReader. `file` can be any `commands.File`.
// If `form` is set to true, the multipart data will have a Content-Type of 'multipart/form-data',
// if `form` is false, the Content-Type will be 'multipart/mixed'.
func NewMultiFileReader(file files.File, form bool) *MultiFileReader {
mfr := &MultiFileReader{
files: file,
form: form,
mutex: &sync.Mutex{},
}
mfr.mpWriter = multipart.NewWriter(&mfr.buf)
return mfr
}
func (mfr *MultiFileReader) Read(buf []byte) (written int, err error) {
mfr.mutex.Lock()
defer mfr.mutex.Unlock()
// if we are closed and the buffer is flushed, end reading
if mfr.closed && mfr.buf.Len() == 0 {
return 0, io.EOF
}
// if the current file isn't set, advance to the next file
if mfr.currentFile == nil {
file, err := mfr.files.NextFile()
if err == io.EOF {
mfr.mpWriter.Close()
mfr.closed = true
} else if err != nil {
return 0, err
}
// handle starting a new file part
if !mfr.closed {
if file.IsDirectory() {
// if file is a directory, create a multifilereader from it
// (using 'multipart/mixed')
mfr.currentFile = NewMultiFileReader(file, false)
} else {
// otherwise, use the file as a reader to read its contents
mfr.currentFile = file
}
// write the boundary and headers
header := make(textproto.MIMEHeader)
filename := url.QueryEscape(file.FileName())
if mfr.form {
contentDisposition := fmt.Sprintf("form-data; name=\"file\"; filename=\"%s\"", filename)
header.Set("Content-Disposition", contentDisposition)
} else {
header.Set("Content-Disposition", fmt.Sprintf("file; filename=\"%s\"", filename))
}
if file.IsDirectory() {
boundary := mfr.currentFile.(*MultiFileReader).Boundary()
header.Set("Content-Type", fmt.Sprintf("multipart/mixed; boundary=%s", boundary))
} else {
header.Set("Content-Type", "application/octet-stream")
}
_, err := mfr.mpWriter.CreatePart(header)
if err != nil {
return 0, err
}
}
}
// if the buffer has something in it, read from it
if mfr.buf.Len() > 0 {
return mfr.buf.Read(buf)
}
// otherwise, read from file data
written, err = mfr.currentFile.Read(buf)
if err == io.EOF {
mfr.currentFile = nil
return written, nil
}
return written, err
}
// Boundary returns the boundary string to be used to separate files in the multipart data
func (mfr *MultiFileReader) Boundary() string {
return mfr.mpWriter.Boundary()
}