Clean segregated file share backends

share/ftp.go

@@ -0,0 +1,67 @@
+package share
+
+import (
+	"context"
+	"fmt"
+	"net"
+
+	"log/slog"
+
+	"github.com/AlexSSD7/linsk/vm"
+	"github.com/pkg/errors"
+)
+
+type FTPBackend struct {
+	sharePort        uint16
+	passivePortCount uint16
+	extIP            net.IP
+}
+
+func NewFTPBackend(uc *UserConfiguration) (Backend, *VMShareOptions, error) {
+	// TODO: Make this changeable?
+	passivePortCount := uint16(9)
+
+	sharePort, err := getNetworkSharePort(9)
+	if err != nil {
+		return nil, nil, errors.Wrap(err, "get network share port")
+	}
+
+	ports := []vm.PortForwardingRule{{
+		HostIP:   uc.listenIP,
+		HostPort: sharePort,
+		VMPort:   21,
+	}}
+
+	for i := uint16(0); i < passivePortCount; i++ {
+		p := sharePort + 1 + i
+		ports = append(ports, vm.PortForwardingRule{
+			HostIP:   uc.listenIP,
+			HostPort: p,
+			VMPort:   p,
+		})
+	}
+
+	return &FTPBackend{
+			sharePort:        sharePort,
+			passivePortCount: passivePortCount,
+			extIP:            uc.ftpExtIP,
+		}, &VMShareOptions{
+			Ports:     ports,
+			EnableTap: false,
+		}, nil
+}
+
+func (b *FTPBackend) Apply(ctx context.Context, sharePWD string, vc *VMShareContext) (string, error) {
+	if vc.NetTapCtx != nil {
+		return "", fmt.Errorf("net taps are unsupported in ftp")
+	}
+
+	err := vc.FileManager.StartFTP(sharePWD, b.sharePort+1, b.passivePortCount, b.extIP)
+	if err != nil {
+		return "", errors.Wrap(err, "start ftp server")
+	}
+
+	slog.Info("Started the network share successfully", "type", "ftp")
+
+	return "ftp://" + b.extIP.String() + ":" + fmt.Sprint(b.sharePort), nil
+}