+
+type FileHeader struct {
+ Size [2]byte // Total size of FileHeader payload
+ Type [2]byte // 0 for file, 1 for dir
+ FilePath []byte // encoded file path
+
+ readOffset int // Internal offset to track read progress
+}
+
+func NewFileHeader(fileName string, isDir bool) FileHeader {
+ fh := FileHeader{
+ FilePath: EncodeFilePath(fileName),
+ }
+ if isDir {
+ fh.Type = [2]byte{0x00, 0x01}
+ }
+
+ encodedPathLen := uint16(len(fh.FilePath) + len(fh.Type))
+ binary.BigEndian.PutUint16(fh.Size[:], encodedPathLen)
+
+ return fh
+}
+
+func (fh *FileHeader) Read(p []byte) (int, error) {
+ buf := slices.Concat(
+ fh.Size[:],
+ fh.Type[:],
+ fh.FilePath,
+ )
+
+ if fh.readOffset >= len(buf) {
+ return 0, io.EOF // All bytes have been read
+ }
+
+ n := copy(p, buf[fh.readOffset:])
+ fh.readOffset += n
+
+ return n, nil
+}
+
+func DownloadHandler(w io.Writer, fullPath string, fileTransfer *FileTransfer, fs FileStore, rLogger *slog.Logger, preserveForks bool) error {
+ //s.Stats.DownloadCounter += 1
+ //s.Stats.DownloadsInProgress += 1
+ //defer func() {
+ // s.Stats.DownloadsInProgress -= 1
+ //}()
+
+ var dataOffset int64
+ if fileTransfer.FileResumeData != nil {
+ dataOffset = int64(binary.BigEndian.Uint32(fileTransfer.FileResumeData.ForkInfoList[0].DataSize[:]))
+ }
+
+ fw, err := NewFileWrapper(fs, fullPath, 0)
+ if err != nil {
+ return fmt.Errorf("reading file header: %v", err)
+ }
+
+ rLogger.Info("Download file", "filePath", fullPath)
+
+ // If file transfer options are included, that means this is a "quick preview" request. In this case skip sending
+ // the flat file info and proceed directly to sending the file data.
+ if fileTransfer.Options == nil {
+ if _, err = io.Copy(w, fw.Ffo); err != nil {
+ return fmt.Errorf("send flat file object: %v", err)
+ }
+ }
+
+ file, err := fw.dataForkReader()
+ if err != nil {
+ return fmt.Errorf("open data fork reader: %v", err)
+ }
+
+ br := bufio.NewReader(file)
+ if _, err := br.Discard(int(dataOffset)); err != nil {
+ return fmt.Errorf("seek to resume offsent: %v", err)
+ }
+
+ if _, err = io.Copy(w, io.TeeReader(br, fileTransfer.bytesSentCounter)); err != nil {
+ return fmt.Errorf("send data fork: %v", err)
+ }
+
+ // If the client requested to resume transfer, do not send the resource fork header.
+ if fileTransfer.FileResumeData == nil {
+ err = binary.Write(w, binary.BigEndian, fw.rsrcForkHeader())
+ if err != nil {
+ return fmt.Errorf("send resource fork header: %v", err)
+ }
+ }
+
+ rFile, _ := fw.rsrcForkFile()
+ //if err != nil {
+ // // return fmt.Errorf("open resource fork file: %v", err)
+ //}
+
+ _, _ = io.Copy(w, io.TeeReader(rFile, fileTransfer.bytesSentCounter))
+ //if err != nil {
+ // // return fmt.Errorf("send resource fork data: %v", err)
+ //}
+
+ return nil
+}
+
+func UploadHandler(rwc io.ReadWriter, fullPath string, fileTransfer *FileTransfer, fileStore FileStore, rLogger *slog.Logger, preserveForks bool) error {
+ var file *os.File
+
+ // A file upload has two possible cases:
+ // 1) Upload a new file
+ // 2) Resume a partially transferred file
+ // We have to infer which case applies by inspecting what is already on the filesystem
+
+ // Check for existing file. If found, do not proceed. This is an invalid scenario, as the file upload transaction
+ // handler should have returned an error to the client indicating there was an existing file present.
+ _, err := os.Stat(fullPath)
+ if err == nil {
+ // return fmt.Errorf("existing file found: %s", fullPath)
+ }
+ // if errors.Is(err, fs.ErrNotExist) {
+ // If not found, open or create a new .incomplete file
+ file, err = os.OpenFile(fullPath+IncompleteFileSuffix, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0644)
+ if err != nil {
+ return err
+ }
+ // }
+
+ defer file.Close()
+
+ f, err := NewFileWrapper(fileStore, fullPath, 0)
+ if err != nil {
+ return err
+ }
+
+ rLogger.Debug("File upload started", "dstFile", fullPath)
+
+ rForkWriter := io.Discard
+ iForkWriter := io.Discard
+ if preserveForks {
+ rForkWriter, err = f.rsrcForkWriter()
+ if err != nil {
+ return err
+ }
+
+ iForkWriter, err = f.InfoForkWriter()
+ if err != nil {
+ return err
+ }
+ }
+
+ if err := receiveFile(rwc, file, rForkWriter, iForkWriter, fileTransfer.bytesSentCounter); err != nil {
+ return fmt.Errorf("receive file: %v", err)
+ }
+
+ if err := fileStore.Rename(fullPath+".incomplete", fullPath); err != nil {
+ return fmt.Errorf("rename incomplete file: %v", err)
+ }
+
+ rLogger.Info("File upload complete", "dstFile", fullPath)
+
+ return nil
+}
+
+func DownloadFolderHandler(rwc io.ReadWriter, fullPath string, fileTransfer *FileTransfer, fileStore FileStore, rLogger *slog.Logger, preserveForks bool) error {
+ // Folder Download flow:
+ // 1. Get filePath from the transfer
+ // 2. Iterate over files
+ // 3. For each file:
+ // Send file header to client
+ // The client can reply in 3 ways:
+ //
+ // 1. If type is an odd number (unknown type?), or file download for the current file is completed:
+ // client sends []byte{0x00, 0x03} to tell the server to continue to the next file
+ //
+ // 2. If download of a file is to be resumed:
+ // client sends:
+ // []byte{0x00, 0x02} // download folder action
+ // [2]byte // Resume data size
+ // []byte file resume data (see myField_FileResumeData)
+ //
+ // 3. Otherwise, download of the file is requested and client sends []byte{0x00, 0x01}
+ //
+ // When download is requested (case 2 or 3), server replies with:
+ // [4]byte - file size
+ // []byte - Flattened File Object
+ //
+ // After every file download, client could request next file with:
+ // []byte{0x00, 0x03}
+ //
+ // This notifies the server to send the next item header
+
+ basePathLen := len(fullPath)
+
+ rLogger.Info("Start folder download", "path", fullPath)
+
+ nextAction := make([]byte, 2)
+ if _, err := io.ReadFull(rwc, nextAction); err != nil {
+ return err
+ }
+
+ i := 0
+ err := filepath.Walk(fullPath+"/", func(path string, info os.FileInfo, err error) error {
+ //s.Stats.DownloadCounter += 1
+ i += 1
+
+ if err != nil {
+ return err
+ }
+
+ // skip dot files
+ if strings.HasPrefix(info.Name(), ".") {
+ return nil
+ }
+
+ hlFile, err := NewFileWrapper(fileStore, path, 0)
+ if err != nil {
+ return err
+ }
+
+ subPath := path[basePathLen+1:]
+
+ if i == 1 {
+ return nil
+ }
+
+ fileHeader := NewFileHeader(subPath, info.IsDir())
+ if _, err := io.Copy(rwc, &fileHeader); err != nil {
+ return fmt.Errorf("error sending file header: %w", err)
+ }
+
+ // Read the client's Next Action request
+ if _, err := io.ReadFull(rwc, nextAction); err != nil {
+ return err
+ }
+
+ var dataOffset int64
+
+ switch nextAction[1] {
+ case DlFldrActionResumeFile:
+ // get size of resumeData
+ resumeDataByteLen := make([]byte, 2)
+ if _, err := io.ReadFull(rwc, resumeDataByteLen); err != nil {
+ return err
+ }
+
+ resumeDataLen := binary.BigEndian.Uint16(resumeDataByteLen)
+ resumeDataBytes := make([]byte, resumeDataLen)
+ if _, err := io.ReadFull(rwc, resumeDataBytes); err != nil {
+ return err
+ }
+
+ var frd FileResumeData
+ if err := frd.UnmarshalBinary(resumeDataBytes); err != nil {
+ return err
+ }
+ dataOffset = int64(binary.BigEndian.Uint32(frd.ForkInfoList[0].DataSize[:]))
+ case DlFldrActionNextFile:
+ // client asked to skip this file
+ return nil
+ }
+
+ if info.IsDir() {
+ return nil
+ }
+
+ rLogger.Info("File download started",
+ "fileName", info.Name(),
+ "TransferSize", fmt.Sprintf("%x", hlFile.Ffo.TransferSize(dataOffset)),
+ )
+
+ // Send file size to client
+ if _, err := rwc.Write(hlFile.Ffo.TransferSize(dataOffset)); err != nil {
+ rLogger.Error(err.Error())
+ return fmt.Errorf("error sending file size: %w", err)
+ }
+
+ // Send ffo bytes to client
+ _, err = io.Copy(rwc, hlFile.Ffo)
+ if err != nil {
+ return fmt.Errorf("error sending flat file object: %w", err)
+ }
+
+ file, err := fileStore.Open(path)
+ if err != nil {
+ return fmt.Errorf("error opening file: %w", err)
+ }
+
+ // wr := bufio.NewWriterSize(rwc, 1460)
+ if _, err = io.Copy(rwc, io.TeeReader(file, fileTransfer.bytesSentCounter)); err != nil {
+ return fmt.Errorf("error sending file: %w", err)
+ }
+
+ if nextAction[1] != 2 && hlFile.Ffo.FlatFileHeader.ForkCount[1] == 3 {
+ err = binary.Write(rwc, binary.BigEndian, hlFile.rsrcForkHeader())
+ if err != nil {
+ return fmt.Errorf("error sending resource fork header: %w", err)
+ }
+
+ rFile, err := hlFile.rsrcForkFile()
+ if err != nil {
+ return fmt.Errorf("error opening resource fork: %w", err)
+ }
+
+ if _, err = io.Copy(rwc, io.TeeReader(rFile, fileTransfer.bytesSentCounter)); err != nil {
+ return fmt.Errorf("error sending resource fork: %w", err)
+ }
+ }
+
+ // Read the client's Next Action request. This is always 3, I think?
+ if _, err := io.ReadFull(rwc, nextAction); err != nil && err != io.EOF {
+ return fmt.Errorf("error reading client next action: %w", err)
+ }
+
+ return nil
+ })
+
+ if err != nil {
+ return err
+ }
+
+ return nil
+}
+
+func UploadFolderHandler(rwc io.ReadWriter, fullPath string, fileTransfer *FileTransfer, fileStore FileStore, rLogger *slog.Logger, preserveForks bool) error {
+
+ // Check if the target folder exists. If not, create it.
+ if _, err := fileStore.Stat(fullPath); os.IsNotExist(err) {
+ if err := fileStore.Mkdir(fullPath, 0777); err != nil {
+ return err
+ }
+ }
+
+ // Begin the folder upload flow by sending the "next file action" to client
+ if _, err := rwc.Write([]byte{0, DlFldrActionNextFile}); err != nil {
+ return err
+ }
+
+ fileSize := make([]byte, 4)
+
+ for i := 0; i < fileTransfer.ItemCount(); i++ {
+ //s.Stats.UploadCounter += 1
+
+ var fu folderUpload
+ // TODO: implement io.Writer on folderUpload and replace this
+ if _, err := io.ReadFull(rwc, fu.DataSize[:]); err != nil {
+ return err
+ }
+ if _, err := io.ReadFull(rwc, fu.IsFolder[:]); err != nil {
+ return err
+ }
+ if _, err := io.ReadFull(rwc, fu.PathItemCount[:]); err != nil {
+ return err
+ }
+ fu.FileNamePath = make([]byte, binary.BigEndian.Uint16(fu.DataSize[:])-4) // -4 to subtract the path separator bytes TODO: wat
+ if _, err := io.ReadFull(rwc, fu.FileNamePath); err != nil {
+ return err
+ }
+
+ if fu.IsFolder == [2]byte{0, 1} {
+ if _, err := os.Stat(filepath.Join(fullPath, fu.FormattedPath())); os.IsNotExist(err) {
+ if err := os.Mkdir(filepath.Join(fullPath, fu.FormattedPath()), 0777); err != nil {
+ return err
+ }
+ }
+
+ // Tell client to send next file
+ if _, err := rwc.Write([]byte{0, DlFldrActionNextFile}); err != nil {
+ return err
+ }
+ } else {
+ nextAction := DlFldrActionSendFile
+
+ // Check if we have the full file already. If so, send dlFldrAction_NextFile to client to skip.
+ _, err := os.Stat(filepath.Join(fullPath, fu.FormattedPath()))
+ if err != nil && !errors.Is(err, fs.ErrNotExist) {
+ return err
+ }
+ if err == nil {
+ nextAction = DlFldrActionNextFile
+ }
+
+ // Check if we have a partial file already. If so, send dlFldrAction_ResumeFile to client to resume upload.
+ incompleteFile, err := os.Stat(filepath.Join(fullPath, fu.FormattedPath()+IncompleteFileSuffix))
+ if err != nil && !errors.Is(err, fs.ErrNotExist) {
+ return err
+ }
+ if err == nil {
+ nextAction = DlFldrActionResumeFile
+ }
+
+ if _, err := rwc.Write([]byte{0, uint8(nextAction)}); err != nil {
+ return err
+ }
+
+ switch nextAction {
+ case DlFldrActionNextFile:
+ continue
+ case DlFldrActionResumeFile:
+ offset := make([]byte, 4)
+ binary.BigEndian.PutUint32(offset, uint32(incompleteFile.Size()))
+
+ file, err := os.OpenFile(fullPath+"/"+fu.FormattedPath()+IncompleteFileSuffix, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+ if err != nil {
+ return err
+ }
+
+ fileResumeData := NewFileResumeData([]ForkInfoList{*NewForkInfoList(offset)})
+
+ b, _ := fileResumeData.BinaryMarshal()
+
+ bs := make([]byte, 2)
+ binary.BigEndian.PutUint16(bs, uint16(len(b)))
+
+ if _, err := rwc.Write(append(bs, b...)); err != nil {
+ return err
+ }
+
+ if _, err := io.ReadFull(rwc, fileSize); err != nil {
+ return err
+ }
+
+ if err := receiveFile(rwc, file, io.Discard, io.Discard, fileTransfer.bytesSentCounter); err != nil {
+ rLogger.Error(err.Error())
+ }
+
+ err = os.Rename(fullPath+"/"+fu.FormattedPath()+".incomplete", fullPath+"/"+fu.FormattedPath())
+ if err != nil {
+ return err
+ }
+
+ case DlFldrActionSendFile:
+ if _, err := io.ReadFull(rwc, fileSize); err != nil {
+ return err
+ }
+
+ filePath := filepath.Join(fullPath, fu.FormattedPath())
+
+ hlFile, err := NewFileWrapper(fileStore, filePath, 0)
+ if err != nil {
+ return err
+ }
+
+ rLogger.Info("Starting file transfer", "path", filePath, "fileNum", i+1, "fileSize", binary.BigEndian.Uint32(fileSize))
+
+ incWriter, err := hlFile.incFileWriter()
+ if err != nil {
+ return err
+ }
+
+ rForkWriter := io.Discard
+ iForkWriter := io.Discard
+ if preserveForks {
+ iForkWriter, err = hlFile.InfoForkWriter()
+ if err != nil {
+ return err
+ }
+
+ rForkWriter, err = hlFile.rsrcForkWriter()
+ if err != nil {
+ return err
+ }
+ }
+ if err := receiveFile(rwc, incWriter, rForkWriter, iForkWriter, fileTransfer.bytesSentCounter); err != nil {
+ return err
+ }
+
+ if err := os.Rename(filePath+".incomplete", filePath); err != nil {
+ return err
+ }
+ }
+
+ // Tell client to send next file
+ if _, err := rwc.Write([]byte{0, DlFldrActionNextFile}); err != nil {
+ return err
+ }
+ }
+ }
+ rLogger.Info("Folder upload complete")
+ return nil
+}
git.r.bdr.sh / rbdr / mobius / blobdiff