rclone/vendor/github.com/goftp/server/auth.go

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// 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
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import (
"crypto/subtle"
)
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// Auth is an interface to auth your ftp user login.
type Auth interface {
CheckPasswd(string, string) (bool, error)
}
var (
_ Auth = &SimpleAuth{}
)
// SimpleAuth implements Auth interface to provide a memory user login auth
type SimpleAuth struct {
Name string
Password string
}
// CheckPasswd will check user's password
func (a *SimpleAuth) CheckPasswd(name, pass string) (bool, error) {
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return constantTimeEquals(name, a.Name) && constantTimeEquals(pass, a.Password), nil
}
func constantTimeEquals(a, b string) bool {
return len(a) == len(b) && subtle.ConstantTimeCompare([]byte(a), []byte(b)) == 1
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}