smtp/server.go

   1 package smtp
   2
   3 import (
   4         "crypto/tls"
   5         "fmt"
   6         "io"
   7         "net"
   8         "net/mail"
   9         "time"
  10 )
  11
  12 type ReplyLine struct {
  13         Code    int
  14         Message string
  15 }
  16
  17 func (l ReplyLine) String() string {
  18         return fmt.Sprintf("%d %s", l.Code, l.Message)
  19 }
  20
  21 var (
  22         ReplyOK          = ReplyLine{250, "OK"}
  23         ReplyBadSyntax   = ReplyLine{501, "syntax error"}
  24         ReplyBadSequence = ReplyLine{503, "bad sequence of commands"}
  25         ReplyBadMailbox  = ReplyLine{550, "mailbox unavailable"}
  26 )
  27
  28 type Envelope struct {
  29         RemoteAddr net.Addr
  30         EHLO       string
  31         MailFrom   mail.Address
  32         RcptTo     []mail.Address
  33         Data       []byte
  34         Received   time.Time
  35         ID         string
  36 }
  37
  38 func WriteEnvelopeForDelivery(w io.Writer, e Envelope) {
  39         fmt.Fprintf(w, "Delivered-To: <%s>\r\n", e.RcptTo[0].Address)
  40         fmt.Fprintf(w, "Return-Path: <%s>\r\n", e.MailFrom.Address)
  41         w.Write(e.Data)
  42 }
  43
  44 type Server interface {
  45         Name() string
  46         TLSConfig() *tls.Config
  47         OnEHLO() *ReplyLine
  48         VerifyAddress(mail.Address) ReplyLine
  49         OnMessageDelivered(Envelope) *ReplyLine
  50 }
  51
  52 type EmptyServerCallbacks struct{}
  53
  54 func (*EmptyServerCallbacks) TLSConfig() *tls.Config {
  55         return nil
  56 }
  57
  58 func (*EmptyServerCallbacks) OnEHLO() *ReplyLine {
  59         return nil
  60 }
  61
  62 func (*EmptyServerCallbacks) VerifyAddress(mail.Address) ReplyLine {
  63         return ReplyOK
  64 }
  65
  66 func (*EmptyServerCallbacks) OnMessageDelivered(Envelope) *ReplyLine {
  67         return nil
  68 }