vendor: change goftp/server url

Closing #3674

vendor/goftp.io/server/perm.go

@@ -0,0 +1,52 @@
+// Copyright 2018 The goftp Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package server
+
+import "os"
+
+type Perm interface {
+	GetOwner(string) (string, error)
+	GetGroup(string) (string, error)
+	GetMode(string) (os.FileMode, error)
+
+	ChOwner(string, string) error
+	ChGroup(string, string) error
+	ChMode(string, os.FileMode) error
+}
+
+type SimplePerm struct {
+	owner, group string
+}
+
+func NewSimplePerm(owner, group string) *SimplePerm {
+	return &SimplePerm{
+		owner: owner,
+		group: group,
+	}
+}
+
+func (s *SimplePerm) GetOwner(string) (string, error) {
+	return s.owner, nil
+}
+
+func (s *SimplePerm) GetGroup(string) (string, error) {
+	return s.group, nil
+}
+
+func (s *SimplePerm) GetMode(string) (os.FileMode, error) {
+	return os.ModePerm, nil
+}
+
+func (s *SimplePerm) ChOwner(string, string) error {
+	return nil
+}
+
+func (s *SimplePerm) ChGroup(string, string) error {
+	return nil
+}
+
+func (s *SimplePerm) ChMode(string, os.FileMode) error {
+	return nil
+}