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package koushin
import (
"fmt"
"io"
"time"
"github.com/emersion/go-message/mail"
"github.com/emersion/go-smtp"
)
func (s *Server) connectSMTP() (*smtp.Client, error) {
var c *smtp.Client
var err error
if s.smtp.tls {
c, err = smtp.DialTLS(s.smtp.host, nil)
if err != nil {
return nil, fmt.Errorf("failed to connect to SMTPS server: %v", err)
}
} else {
c, err = smtp.Dial(s.smtp.host)
if err != nil {
return nil, fmt.Errorf("failed to connect to SMTP server: %v", err)
}
if !s.smtp.insecure {
if err := c.StartTLS(nil); err != nil {
c.Close()
return nil, fmt.Errorf("STARTTLS failed: %v", err)
}
}
}
return c, err
}
type OutgoingMessage struct {
From string
To []string
Subject string
Text string
}
func (msg *OutgoingMessage) WriteTo(w io.Writer) error {
from := []*mail.Address{{"", msg.From}}
to := make([]*mail.Address, len(msg.To))
for i, addr := range msg.To {
to[i] = &mail.Address{"", addr}
}
var h mail.Header
h.SetDate(time.Now())
h.SetAddressList("From", from)
h.SetAddressList("To", to)
if msg.Subject != "" {
h.SetText("Subject", msg.Subject)
}
mw, err := mail.CreateWriter(w, h)
if err != nil {
return fmt.Errorf("failed to create mail writer: %v", err)
}
var th mail.InlineHeader
th.Set("Content-Type", "text/plain; charset=utf-8")
tw, err := mw.CreateSingleInline(th)
if err != nil {
return fmt.Errorf("failed to create text part: %v", err)
}
defer tw.Close()
if _, err := io.WriteString(tw, msg.Text); err != nil {
return fmt.Errorf("failed to write text part: %v", err)
}
if err := tw.Close(); err != nil {
return fmt.Errorf("failed to close text part: %v", err)
}
if err := mw.Close(); err != nil {
return fmt.Errorf("failed to close mail writer: %v", err)
}
return nil
}
func sendMessage(c *smtp.Client, msg *OutgoingMessage) error {
if err := c.Mail(msg.From, nil); err != nil {
return fmt.Errorf("MAIL FROM failed: %v", err)
}
for _, to := range msg.To {
if err := c.Rcpt(to); err != nil {
return fmt.Errorf("RCPT TO failed: %v", err)
}
}
w, err := c.Data()
if err != nil {
return fmt.Errorf("DATA failed: %v", err)
}
defer w.Close()
if err := msg.WriteTo(w); err != nil {
return fmt.Errorf("failed to write outgoing message: %v", err)
}
if err := w.Close(); err != nil {
return fmt.Errorf("failed to close SMTP data writer: %v", err)
}
return nil
}
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