feat(sftp): support range header

drivers/smb/driver.go

@@ -3,16 +3,13 @@ package smb
 import (
 	"context"
 	"errors"
-	"io"
-	"net/http"
 	"path/filepath"
-	"strconv"
 	"strings"
 	"time"
 
+	"github.com/alist-org/alist/v3/drivers/base"
 	"github.com/alist-org/alist/v3/internal/driver"
 	"github.com/alist-org/alist/v3/internal/model"
-	"github.com/alist-org/alist/v3/pkg/http_range"
 	"github.com/alist-org/alist/v3/pkg/utils"
 
 	"github.com/hirochachacha/go-smb2"
@@ -86,22 +83,7 @@ func (d *SMB) Link(ctx context.Context, file model.Obj, args model.LinkArgs) (*m
 	link := &model.Link{
 		Data: remoteFile,
 	}
-	if args.Header.Get("Range") != "" {
-		r, err := http_range.ParseRange(args.Header.Get("Range"), file.GetSize())
-		if err == nil && len(r) > 0 {
-			_, err := remoteFile.Seek(r[0].Start, io.SeekStart)
-			if err == nil {
-				link.Data = utils.NewLimitReadCloser(remoteFile, func() error {
-					return remoteFile.Close()
-				}, r[0].Length)
-				link.Status = 206
-				link.Header = http.Header{
-					"Content-Range":  []string{r[0].ContentRange(file.GetSize())},
-					"Content-Length": []string{strconv.FormatInt(r[0].Length, 10)},
-				}
-			}
-		}
-	}
+	base.HandleRange(link, remoteFile, args.Header, file.GetSize())
 	d.updateLastConnTime()
 	return link, nil
 }