1 package mail
2
3 import (
4 "bytes"
5 "errors"
6 "fmt"
7 "net/smtp"
8 )
9
10
11 type loginAuth struct {
12 username string
13 password string
14 host string
15 }
16
17 func (a *loginAuth) Start(server *smtp.ServerInfo) (string, []byte, error) {
18 if !server.TLS {
19 advertised := false
20 for _, mechanism := range server.Auth {
21 if mechanism == "LOGIN" {
22 advertised = true
23 break
24 }
25 }
26 if !advertised {
27 return "", nil, errors.New("gomail: unencrypted connection")
28 }
29 }
30 if server.Name != a.host {
31 return "", nil, errors.New("gomail: wrong host name")
32 }
33 return "LOGIN", nil, nil
34 }
35
36 func (a *loginAuth) Next(fromServer []byte, more bool) ([]byte, error) {
37 if !more {
38 return nil, nil
39 }
40
41 switch {
42 case bytes.Equal(fromServer, []byte("Username:")):
43 return []byte(a.username), nil
44 case bytes.Equal(fromServer, []byte("Password:")):
45 return []byte(a.password), nil
46 default:
47 return nil, fmt.Errorf("gomail: unexpected server challenge: %s", fromServer)
48 }
49 }
50
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