feat: ftp server support (#7634 close #1898)

* feat: ftp server support

* fix(ftp): incorrect mode for dirs in LIST returns

internal/model/setting.go

@@ -11,6 +11,7 @@ const (
 	SSO
 	LDAP
 	S3
+	FTP
 )
 
 const (

internal/model/user.go

@@ -117,6 +117,14 @@ func (u *User) CanWebdavManage() bool {
 	return u.IsAdmin() || (u.Permission>>9)&1 == 1
 }
 
+func (u *User) CanFTPAccess() bool {
+	return (u.Permission>>10)&1 == 1
+}
+
+func (u *User) CanFTPManage() bool {
+	return (u.Permission>>11)&1 == 1
+}
+
 func (u *User) JoinPath(reqPath string) (string, error) {
 	return utils.JoinBasePath(u.BasePath, reqPath)
 }