50 lines
1.0 KiB
Go
50 lines
1.0 KiB
Go
|
package gomail
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bytes"
|
||
|
|
"errors"
|
||
|
|
"fmt"
|
||
|
|
"net/smtp"
|
||
|
|
)
|
||
|
|
|
||
|
|
// loginAuth is an smtp.Auth that implements the LOGIN authentication mechanism.
|
||
|
|
type loginAuth struct {
|
||
|
|
username string
|
||
|
|
password string
|
||
|
|
host string
|
||
|
|
}
|
||
|
|
|
||
|
|
func (a *loginAuth) Start(server *smtp.ServerInfo) (string, []byte, error) {
|
||
|
|
if !server.TLS {
|
||
|
|
advertised := false
|
||
|
|
for _, mechanism := range server.Auth {
|
||
|
|
if mechanism == "LOGIN" {
|
||
|
|
advertised = true
|
||
|
|
break
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if !advertised {
|
||
|
|
return "", nil, errors.New("gomail: unencrypted connection")
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if server.Name != a.host {
|
||
|
|
return "", nil, errors.New("gomail: wrong host name")
|
||
|
|
}
|
||
|
|
return "LOGIN", nil, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (a *loginAuth) Next(fromServer []byte, more bool) ([]byte, error) {
|
||
|
|
if !more {
|
||
|
|
return nil, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
switch {
|
||
|
|
case bytes.Equal(fromServer, []byte("Username:")):
|
||
|
|
return []byte(a.username), nil
|
||
|
|
case bytes.Equal(fromServer, []byte("Password:")):
|
||
|
|
return []byte(a.password), nil
|
||
|
|
default:
|
||
|
|
return nil, fmt.Errorf("gomail: unexpected server challenge: %s", fromServer)
|
||
|
|
}
|
||
|
|
}
|