refactor: Make ftpsrv a subcommand of stbak, add decryption support

internal/ftp/logger.go

@@ -0,0 +1,29 @@
+package ftp
+
+import (
+	"log"
+
+	golog "github.com/fclairamb/go-log"
+)
+
+type Logger struct{}
+
+func (l Logger) Debug(event string, keyvals ...interface{}) {
+	log.Println(event, keyvals)
+}
+
+func (l Logger) Info(event string, keyvals ...interface{}) {
+	log.Println(event, keyvals)
+}
+
+func (l Logger) Warn(event string, keyvals ...interface{}) {
+	log.Println(event, keyvals)
+}
+
+func (l Logger) Error(event string, keyvals ...interface{}) {
+	log.Println(event, keyvals)
+}
+
+func (l Logger) With(keyvals ...interface{}) golog.Logger {
+	return l
+}

internal/ftp/server.go

@@ -0,0 +1,59 @@
+package ftp
+
+import (
+	"crypto/tls"
+	"errors"
+	"sync"
+
+	ftpserver "github.com/fclairamb/ftpserverlib"
+	"github.com/spf13/afero"
+)
+
+var (
+	ErrNoTLS = errors.New("no TLS supported")
+)
+
+type FTPServer struct {
+	Settings   *ftpserver.Settings
+	FileSystem afero.Fs
+
+	clientsLock sync.Mutex
+	clients     []ftpserver.ClientContext
+}
+
+func (driver *FTPServer) GetSettings() (*ftpserver.Settings, error) {
+	return driver.Settings, nil
+}
+
+func (driver *FTPServer) GetTLSConfig() (*tls.Config, error) {
+	return nil, ErrNoTLS
+}
+
+func (driver *FTPServer) ClientConnected(cc ftpserver.ClientContext) (string, error) {
+	driver.clientsLock.Lock()
+	defer driver.clientsLock.Unlock()
+
+	driver.clients = append(driver.clients, cc)
+
+	return "", nil
+}
+
+func (driver *FTPServer) ClientDisconnected(cc ftpserver.ClientContext) {
+	driver.clientsLock.Lock()
+	defer driver.clientsLock.Unlock()
+
+	for idx, client := range driver.clients {
+		if client.ID() == cc.ID() {
+			lastIdx := len(driver.clients) - 1
+			driver.clients[idx] = driver.clients[lastIdx]
+			driver.clients[lastIdx] = nil
+			driver.clients = driver.clients[:lastIdx]
+
+			return
+		}
+	}
+}
+
+func (driver *FTPServer) AuthUser(_ ftpserver.ClientContext, user, pass string) (ftpserver.ClientDriver, error) {
+	return driver.FileSystem, nil
+}