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 var (
  18         ReplyOK          = ReplyLine{250, "OK"}
  19         ReplyBadSyntax   = ReplyLine{501, "syntax error"}
  20         ReplyBadSequence = ReplyLine{503, "bad sequence of commands"}
  21         ReplyBadMailbox  = ReplyLine{550, "mailbox unavailable"}
  22 )
  23
  24 type Envelope struct {
  25         RemoteAddr net.Addr
  26         EHLO       string
  27         MailFrom   mail.Address
  28         RcptTo     []mail.Address
  29         Data       []byte
  30         Received   time.Time
  31         ID         string
  32 }
  33
  34 func WriteEnvelopeForDelivery(w io.Writer, e Envelope) {
  35         fmt.Fprintf(w, "Delivered-To: <%s>\r\n", e.RcptTo[0].Address)
  36         fmt.Fprintf(w, "Return-Path: <%s>\r\n", e.MailFrom.Address)
  37         w.Write(e.Data)
  38 }
  39
  40 type Server interface {
  41         Name() string
  42         TLSConfig() *tls.Config
  43         OnEHLO() *ReplyLine
  44         VerifyAddress(mail.Address) ReplyLine
  45         OnMessageDelivered(Envelope) *ReplyLine
  46 }
  47
  48 type EmptyServerCallbacks struct{}
  49
  50 func (*EmptyServerCallbacks) TLSConfig() *tls.Config {
  51         return nil
  52 }
  53
  54 func (*EmptyServerCallbacks) OnEHLO() *ReplyLine {
  55         return nil
  56 }
  57
  58 func (*EmptyServerCallbacks) VerifyAddress(mail.Address) ReplyLine {
  59         return ReplyOK
  60 }
  61
  62 func (*EmptyServerCallbacks) OnMessageDelivered(Envelope) *ReplyLine {
  63         return nil
  64 }