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/sftpd/sftpd.go

@@ -0,0 +1,89 @@
+// 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 sftpd implements the SSH File Transfer Protocol as described in https://tools.ietf.org/html/draft-ietf-secsh-filexfer-02.
+// It uses pkg/sftp library:
+// https://github.com/pkg/sftp
+package sftpd
+
+import (
+	"strings"
+	"time"
+)
+
+const (
+	logSender        = "sftpd"
+	handshakeTimeout = 2 * time.Minute
+)
+
+var (
+	supportedSSHCommands = []string{"scp", "md5sum", "sha1sum", "sha256sum", "sha384sum", "sha512sum", "cd", "pwd",
+		"git-receive-pack", "git-upload-pack", "git-upload-archive", "rsync", "sftpgo-copy", "sftpgo-remove"}
+	defaultSSHCommands = []string{"md5sum", "sha1sum", "sha256sum", "cd", "pwd", "scp"}
+	sshHashCommands    = []string{"md5sum", "sha1sum", "sha256sum", "sha384sum", "sha512sum"}
+	systemCommands     = []string{"git-receive-pack", "git-upload-pack", "git-upload-archive", "rsync"}
+	serviceStatus      ServiceStatus
+)
+
+type sshSubsystemExitStatus struct {
+	Status uint32
+}
+
+type sshSubsystemExecMsg struct {
+	Command string
+}
+
+// HostKey defines the details for a used host key
+type HostKey struct {
+	Path        string `json:"path"`
+	Fingerprint string `json:"fingerprint"`
+}
+
+// ServiceStatus defines the service status
+type ServiceStatus struct {
+	IsActive        bool      `json:"is_active"`
+	Bindings        []Binding `json:"bindings"`
+	SSHCommands     []string  `json:"ssh_commands"`
+	HostKeys        []HostKey `json:"host_keys"`
+	Authentications []string  `json:"authentications"`
+}
+
+// GetSSHCommandsAsString returns enabled SSH commands as comma separated string
+func (s *ServiceStatus) GetSSHCommandsAsString() string {
+	return strings.Join(s.SSHCommands, ", ")
+}
+
+// GetSupportedAuthsAsString returns the supported authentications as comma separated string
+func (s *ServiceStatus) GetSupportedAuthsAsString() string {
+	return strings.Join(s.Authentications, ", ")
+}
+
+// GetStatus returns the server status
+func GetStatus() ServiceStatus {
+	return serviceStatus
+}
+
+// GetDefaultSSHCommands returns the SSH commands enabled as default
+func GetDefaultSSHCommands() []string {
+	result := make([]string, len(defaultSSHCommands))
+	copy(result, defaultSSHCommands)
+	return result
+}
+
+// GetSupportedSSHCommands returns the supported SSH commands
+func GetSupportedSSHCommands() []string {
+	result := make([]string, len(supportedSSHCommands))
+	copy(result, supportedSSHCommands)
+	return result
+}