// Copyright 2012 The Go Authors.  All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Package keychain implements access to the passwords and other keys
// stored in the system-provided keychain.
package keychain

// BUG(rsc): Package keychain is only implemented on OS X.

import (
	"fmt"
)

// UserPasswd returns the user name and password for authenticating
// to the named server.  If the user argument is non-empty, UserPasswd
// restricts its search to passwords for the named user.
func UserPasswd(server, preferredUser string) (user, passwd string, err error) {
	user, passwd, err = userPasswd(server, preferredUser)
	if err != nil {
		if preferredUser != "" {
			err = fmt.Errorf("loading password for %s@%s: %v", preferredUser, server, err)
		} else {
			err = fmt.Errorf("loading password for %s: %v", server, err)
		}
	}
	return
}