33 lines
827 B
Go
33 lines
827 B
Go
// Copyright 2018 The goftp Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package server
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import (
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"crypto/subtle"
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)
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// Auth is an interface to auth your ftp user login.
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type Auth interface {
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CheckPasswd(string, string) (bool, error)
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}
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var (
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_ Auth = &SimpleAuth{}
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)
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// SimpleAuth implements Auth interface to provide a memory user login auth
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type SimpleAuth struct {
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Name string
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Password string
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}
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// CheckPasswd will check user's password
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func (a *SimpleAuth) CheckPasswd(name, pass string) (bool, error) {
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return constantTimeEquals(name, a.Name) && constantTimeEquals(pass, a.Password), nil
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}
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func constantTimeEquals(a, b string) bool {
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return len(a) == len(b) && subtle.ConstantTimeCompare([]byte(a), []byte(b)) == 1
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}
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