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