fix(drivers/ftp): add cwd_list option and filter path-separated entries (#2621)

1. Add `cwd_list` option to switch LIST command logic
   Use CWD + LIST "" instead of LIST <path> to fix garbled non-UTF8 paths on legacy Chinese FTP servers, eliminate fake duplicate folders.
2. Filter entries with "/" in filename
   Skip cdir marker entries carrying full path names, compliant with FTP filename specification.

Co-authored-by: Claude <81847+claude@users.noreply.github.com>

Author: sorubedo

drivers/ftp/driver.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"io"
 	stdpath "path"
+	"strings"
 
 	"github.com/OpenListTeam/OpenList/v4/internal/driver"
 	"github.com/OpenListTeam/OpenList/v4/internal/errs"
@@ -51,13 +52,35 @@ func (d *FTP) List(ctx context.Context, dir model.Obj, args model.ListArgs) ([]m
 	if err := d.login(); err != nil {
 		return nil, err
 	}
-	entries, err := d.conn.List(encode(dir.GetPath(), d.Encoding))
+
+	path := encode(dir.GetPath(), d.Encoding)
+
+	var entries []*ftp.Entry
+	var err error
+
+	if d.CwdList {
+		origDir, cwdErr := d.conn.CurrentDir()
+		if cwdErr != nil {
+			return nil, cwdErr
+		}
+		if cwdErr = d.conn.ChangeDir(path); cwdErr != nil {
+			return nil, cwdErr
+		}
+		entries, err = d.conn.List("")
+		if restoreErr := d.conn.ChangeDir(origDir); restoreErr != nil {
+			d.conn = nil
+		}
+	} else {
+		entries, err = d.conn.List(path)
+	}
+
 	if err != nil {
 		return nil, err
 	}
+
 	res := make([]model.Obj, 0)
 	for _, entry := range entries {
-		if entry.Name == "." || entry.Name == ".." {
+		if entry.Name == "." || entry.Name == ".." || strings.Contains(entry.Name, "/") {
 			continue
 		}
 		name := decode(entry.Name, d.Encoding)

drivers/ftp/meta.go

@@ -27,6 +27,7 @@ type Addition struct {
 	Encoding string `json:"encoding" required:"true"`
 	Username string `json:"username" required:"true"`
 	Password string `json:"password" required:"true"`
+	CwdList  bool   `json:"cwd_list" type:"bool" default:"false" help:"enter directory before listing"`
 	driver.RootPath
 }