scaffold for sftpd

weed/ftpd/ftp_server.go

@@ -0,0 +1,81 @@
+package ftpd
+
+import (
+	"crypto/tls"
+	"errors"
+	"fmt"
+	"net"
+
+	ftpserver "github.com/fclairamb/ftpserverlib"
+	"google.golang.org/grpc"
+)
+
+type FtpServerOption struct {
+	Filer            string
+	IP               string
+	IpBind           string
+	Port             int
+	FilerGrpcAddress string
+	FtpRoot          string
+	GrpcDialOption   grpc.DialOption
+	PassivePortStart int
+	PassivePortStop  int
+}
+
+type SftpServer struct {
+	option      *FtpServerOption
+	ftpListener net.Listener
+}
+
+var _ = ftpserver.MainDriver(&SftpServer{})
+
+// NewServer returns a new FTP server driver
+func NewFtpServer(ftpListener net.Listener, option *FtpServerOption) (*SftpServer, error) {
+	var err error
+	server := &SftpServer{
+		option:      option,
+		ftpListener: ftpListener,
+	}
+	return server, err
+}
+
+// GetSettings returns some general settings around the server setup
+func (s *SftpServer) GetSettings() (*ftpserver.Settings, error) {
+	var portRange *ftpserver.PortRange
+	if s.option.PassivePortStart > 0 && s.option.PassivePortStop > s.option.PassivePortStart {
+		portRange = &ftpserver.PortRange{
+			Start: s.option.PassivePortStart,
+			End:   s.option.PassivePortStop,
+		}
+	}
+
+	return &ftpserver.Settings{
+		Listener:                 s.ftpListener,
+		ListenAddr:               fmt.Sprintf("%s:%d", s.option.IpBind, s.option.Port),
+		PublicHost:               s.option.IP,
+		PassiveTransferPortRange: portRange,
+		ActiveTransferPortNon20:  true,
+		IdleTimeout:              -1,
+		ConnectionTimeout:        20,
+	}, nil
+}
+
+// ClientConnected is called to send the very first welcome message
+func (s *SftpServer) ClientConnected(cc ftpserver.ClientContext) (string, error) {
+	return "Welcome to SeaweedFS FTP Server", nil
+}
+
+// ClientDisconnected is called when the user disconnects, even if he never authenticated
+func (s *SftpServer) ClientDisconnected(cc ftpserver.ClientContext) {
+}
+
+// AuthUser authenticates the user and selects an handling driver
+func (s *SftpServer) AuthUser(cc ftpserver.ClientContext, username, password string) (ftpserver.ClientDriver, error) {
+	return nil, nil
+}
+
+// GetTLSConfig returns a TLS Certificate to use
+// The certificate could frequently change if we use something like "let's encrypt"
+func (s *SftpServer) GetTLSConfig() (*tls.Config, error) {
+	return nil, errors.New("no TLS certificate configured")
+}