move SFTPGo package to the internal folder

SFTPGo is a daemon and command line tool, not a library.

The public API are provided by the SDK

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>

internal/httpd/file.go

@@ -0,0 +1,142 @@
+// Copyright (C) 2019-2022  Nicola Murino
+//
+// This program 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, version 3.
+//
+// This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package httpd
+
+import (
+	"io"
+	"sync/atomic"
+
+	"github.com/eikenb/pipeat"
+
+	"github.com/drakkan/sftpgo/v2/internal/common"
+	"github.com/drakkan/sftpgo/v2/internal/vfs"
+)
+
+type httpdFile struct {
+	*common.BaseTransfer
+	writer     io.WriteCloser
+	reader     io.ReadCloser
+	isFinished bool
+}
+
+func newHTTPDFile(baseTransfer *common.BaseTransfer, pipeWriter *vfs.PipeWriter, pipeReader *pipeat.PipeReaderAt) *httpdFile {
+	var writer io.WriteCloser
+	var reader io.ReadCloser
+	if baseTransfer.File != nil {
+		writer = baseTransfer.File
+		reader = baseTransfer.File
+	} else if pipeWriter != nil {
+		writer = pipeWriter
+	} else if pipeReader != nil {
+		reader = pipeReader
+	}
+	return &httpdFile{
+		BaseTransfer: baseTransfer,
+		writer:       writer,
+		reader:       reader,
+		isFinished:   false,
+	}
+}
+
+// Read reads the contents to downloads.
+func (f *httpdFile) Read(p []byte) (n int, err error) {
+	if atomic.LoadInt32(&f.AbortTransfer) == 1 {
+		err := f.GetAbortError()
+		f.TransferError(err)
+		return 0, err
+	}
+
+	f.Connection.UpdateLastActivity()
+
+	n, err = f.reader.Read(p)
+	atomic.AddInt64(&f.BytesSent, int64(n))
+
+	if err == nil {
+		err = f.CheckRead()
+	}
+	if err != nil && err != io.EOF {
+		f.TransferError(err)
+		return
+	}
+	f.HandleThrottle()
+	return
+}
+
+// Write writes the contents to upload
+func (f *httpdFile) Write(p []byte) (n int, err error) {
+	if atomic.LoadInt32(&f.AbortTransfer) == 1 {
+		err := f.GetAbortError()
+		f.TransferError(err)
+		return 0, err
+	}
+
+	f.Connection.UpdateLastActivity()
+
+	n, err = f.writer.Write(p)
+	atomic.AddInt64(&f.BytesReceived, int64(n))
+
+	if err == nil {
+		err = f.CheckWrite()
+	}
+	if err != nil {
+		f.TransferError(err)
+		return
+	}
+	f.HandleThrottle()
+	return
+}
+
+// Close closes the current transfer
+func (f *httpdFile) Close() error {
+	if err := f.setFinished(); err != nil {
+		return err
+	}
+	err := f.closeIO()
+	errBaseClose := f.BaseTransfer.Close()
+	if errBaseClose != nil {
+		err = errBaseClose
+	}
+
+	return f.Connection.GetFsError(f.Fs, err)
+}
+
+func (f *httpdFile) closeIO() error {
+	var err error
+	if f.File != nil {
+		err = f.File.Close()
+	} else if f.writer != nil {
+		err = f.writer.Close()
+		f.Lock()
+		// we set ErrTransfer here so quota is not updated, in this case the uploads are atomic
+		if err != nil && f.ErrTransfer == nil {
+			f.ErrTransfer = err
+		}
+		f.Unlock()
+	} else if f.reader != nil {
+		err = f.reader.Close()
+	}
+	return err
+}
+
+func (f *httpdFile) setFinished() error {
+	f.Lock()
+	defer f.Unlock()
+
+	if f.isFinished {
+		return common.ErrTransferClosed
+	}
+	f.isFinished = true
+	return nil
+}