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// Copyright 2026 Rose Hogenson <r@roseh.moe>
//
// This file is part of roseh.moe.
//
// roseh.moe is free software: you can redistribute it and/or modify it
// under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License,
// or (at your option) any later version.
//
// roseh.moe is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public
// License along with roseh.moe. If not, see
// <https://www.gnu.org/licenses/>.
package hole
import (
"archive/tar"
"cmp"
"compress/gzip"
"crypto/hkdf"
"crypto/rand"
"crypto/sha256"
"encoding/binary"
"errors"
"fmt"
"io"
"io/fs"
"log"
"mime/multipart"
"os"
"strings"
"time"
"roseh.moe/pkg/oae2"
"roseh.moe/pkg/wordlist"
)
var HoleTempDir string
func makeHole() string {
const nWords = 10
buf := make([]byte, 2*nWords)
rand.Read(buf)
words := make([]string, nWords)
for i := range words {
words[i] = wordlist.Words[binary.NativeEndian.Uint16(buf[2*i:])&0x1fff]
}
return strings.Join(words, "-")
}
const blockSize = 4 * 1024 * 1024
type holeFileWriter struct {
*oae2.Writer
f *os.File
}
func (w *holeFileWriter) Close() error {
return cmp.Or(w.Writer.Close(), w.f.Close())
}
func writeHoleFile(filename string) (_ string, _ *holeFileWriter, err error) {
hole := makeHole()
primaryKey, err := hkdf.Key(sha256.New, []byte(hole), nil, "", 32)
if err != nil {
return "", nil, err
}
f, err := os.Create(fmt.Sprintf("%s/%x", HoleTempDir, primaryKey))
if err != nil {
return "", nil, err
}
defer func() {
if err != nil {
f.Close()
}
}()
w := oae2.NewWriter(f, []byte(hole), blockSize, nil)
buf := make([]byte, 8)
binary.BigEndian.PutUint64(buf, uint64(len(filename)))
if _, err := w.Write(buf); err != nil {
return "", nil, err
}
if _, err := io.WriteString(w, filename); err != nil {
return "", nil, err
}
return hole, &holeFileWriter{w, f}, nil
}
type offsetReader struct {
io.ReadSeeker
offset int
}
func (r *offsetReader) Seek(offset int64, whence int) (int64, error) {
if whence == io.SeekStart {
offset += int64(r.offset)
}
n, err := r.ReadSeeker.Seek(offset, whence)
return n - int64(r.offset), err
}
type HoleFileReader struct {
*offsetReader
F *os.File
}
func (r *HoleFileReader) Close() error {
return r.F.Close()
}
var ErrNoHole = errors.New("no such hole")
func Open(hole string) (_ string, _ *HoleFileReader, err error) {
primaryKey, err := hkdf.Key(sha256.New, []byte(hole), nil, "", 32)
if err != nil {
return "", nil, err
}
f, err := os.Open(fmt.Sprintf("%s/%x", HoleTempDir, primaryKey))
if err != nil {
if errors.Is(err, fs.ErrNotExist) {
return "", nil, ErrNoHole
}
return "", nil, err
}
defer func() {
if err != nil {
f.Close()
}
}()
r := oae2.NewReader(f, []byte(hole), blockSize, nil)
buf := make([]byte, 8)
if _, err := io.ReadFull(r, buf); err != nil {
return "", nil, err
}
fileNameLen := binary.BigEndian.Uint64(buf)
fileName := make([]byte, fileNameLen)
if _, err := io.ReadFull(r, fileName); err != nil {
return "", nil, err
}
return string(fileName), &HoleFileReader{&offsetReader{r, 8 + int(fileNameLen)}, f}, nil
}
func writeHoleFileToTarFile(tarWriter *tar.Writer, hole string, now time.Time) error {
fileName, f, err := Open(hole)
if err != nil {
return fmt.Errorf("read back hole file: %s", err)
}
defer f.Close()
size, err := f.Seek(0, io.SeekEnd)
if err != nil {
return fmt.Errorf("read back hole file: %s", err)
}
if _, err := f.Seek(0, io.SeekStart); err != nil {
return fmt.Errorf("read back hole file: %s", err)
}
if err := tarWriter.WriteHeader(&tar.Header{Name: "wormhole-files/" + fileName, Mode: 0644, Size: size, ModTime: now, Format: tar.FormatPAX}); err != nil {
return err
}
if _, err := io.Copy(tarWriter, f); err != nil {
return fmt.Errorf("write file to tar file: %s", err)
}
return nil
}
var ErrNoFile = errors.New("no file")
func Upload(reader *multipart.Reader) (string, error) {
var holes []string
for {
part, err := reader.NextPart()
if err != nil {
break
}
if part.FormName() != "file" || part.FileName() == "" {
continue
}
hole, err := WriteSingleFile(part.FileName(), part)
if err != nil {
return "", err
}
holes = append(holes, hole)
}
if len(holes) == 0 {
return "", ErrNoFile
}
if len(holes) == 1 {
return holes[0], nil
}
tarFileHole, tarHoleWriter, err := writeHoleFile("wormhole-files.tar.gz")
if err != nil {
return "", fmt.Errorf("make tar file: %s", err)
}
defer tarHoleWriter.Close()
gzipWriter, err := gzip.NewWriterLevel(tarHoleWriter, gzip.BestSpeed)
if err != nil {
return "", err
}
tarWriter := tar.NewWriter(gzipWriter)
now := time.Now()
if err := tarWriter.WriteHeader(&tar.Header{Name: "wormhole-files/", Mode: 0755, ModTime: now, Format: tar.FormatPAX}); err != nil {
return "", fmt.Errorf("create tar file main directory: %s", err)
}
for _, hole := range holes {
if err := writeHoleFileToTarFile(tarWriter, hole, now); err != nil {
return "", err
}
}
if err := tarWriter.Close(); err != nil {
return "", fmt.Errorf("write tar file: %s", err)
}
if err := gzipWriter.Close(); err != nil {
return "", fmt.Errorf("gzip tar file: %s", err)
}
if err := tarHoleWriter.Close(); err != nil {
return "", fmt.Errorf("write tar hole file: %s", err)
}
return tarFileHole, nil
}
func WriteSingleFile(filename string, r io.Reader) (string, error) {
hole, holeWriter, err := writeHoleFile(filename)
if err != nil {
return "", fmt.Errorf("write hole file: %s", err)
}
defer holeWriter.Close()
if _, err := io.Copy(holeWriter, r); err != nil {
return "", fmt.Errorf("write hole file: %s", err)
}
if err := holeWriter.Close(); err != nil {
return "", fmt.Errorf("write hole file: %s", err)
}
return hole, nil
}
func Clean() error {
log.Printf("Cleaning hole...")
holeDir, err := os.Open(HoleTempDir)
if err != nil {
return err
}
defer holeDir.Close()
deadline := time.Now().Add(-time.Hour)
for {
files, err := holeDir.ReadDir(1024)
for _, file := range files {
stat, err := file.Info()
if err != nil {
log.Printf("Error: clean hole: %s", err)
continue
}
if !stat.ModTime().Before(deadline) {
continue
}
if err := os.Remove(HoleTempDir + "/" + file.Name()); err != nil {
log.Printf("Error: clean hole: %s", err)
continue
}
}
if err != nil {
if err != io.EOF {
return err
}
return nil
}
}
}
func Init() error {
if err := os.MkdirAll(HoleTempDir, 0700); err != nil {
return err
}
return nil
}
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