官方库里面只看到 PlainAuth 和 CramMd5Auth 两种认证方法。
type loginAuth struct {
username, password string
}
func LoginAuth(username, password string) smtp.Auth {
return &loginAuth{username, password}
}
func (a *loginAuth) Start(server *smtp.ServerInfo) (proto string, toServer []byte, err error) {
return "LOGIN", []byte{}, nil
}
func (a *loginAuth) Next(fromServer []byte, more bool) (toServer []byte, err error) {
if more {
switch strings.ToUpper(string(fromServer)) {
case "USERNAME:":
return []byte(a.username), nil
case "PASSWORD:":
return []byte(a.password), nil
default:
return nil, fmt.Errorf("unknown command %v", fromServer)
}
}
return nil, nil
}