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// Copyright (c) 2012, Sean Treadway, SoundCloud Ltd.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Source code and contact info at
package amqp
import (
// Interface to encode different SASL authentication mechanisms used during connection tuning.
type Authentication interface {
Mechanism() string
Response() string
type PlainAuth struct {
Username string
Password string
func (me *PlainAuth) Mechanism() string {
return "PLAIN"
func (me *PlainAuth) Response() string {
return fmt.Sprintf("\000%s\000%s", me.Username, me.Password)
// Finds the first mechanism preferred by the client that the server supports.
func pickSASLMechanism(client []Authentication, serverMechanisms []string) (auth Authentication, ok bool) {
for _, auth = range client {
for _, mech := range serverMechanisms {
if auth.Mechanism() == mech {
return auth, true