154 lines
3.3 KiB
Go
154 lines
3.3 KiB
Go
package koushinbase
|
|
|
|
import (
|
|
"bufio"
|
|
"fmt"
|
|
"io"
|
|
"mime/multipart"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/emersion/go-message/mail"
|
|
"github.com/emersion/go-smtp"
|
|
)
|
|
|
|
func quote(r io.Reader) (string, error) {
|
|
scanner := bufio.NewScanner(r)
|
|
var builder strings.Builder
|
|
for scanner.Scan() {
|
|
builder.WriteString("> ")
|
|
builder.Write(scanner.Bytes())
|
|
builder.WriteString("\n")
|
|
}
|
|
if err := scanner.Err(); err != nil {
|
|
return "", fmt.Errorf("quote: failed to read original message: %s", err)
|
|
}
|
|
return builder.String(), nil
|
|
}
|
|
|
|
type OutgoingMessage struct {
|
|
From string
|
|
To []string
|
|
Subject string
|
|
InReplyTo string
|
|
Text string
|
|
Attachments []*multipart.FileHeader
|
|
}
|
|
|
|
func (msg *OutgoingMessage) ToString() string {
|
|
return strings.Join(msg.To, ", ")
|
|
}
|
|
|
|
func writeAttachment(mw *mail.Writer, att *multipart.FileHeader) error {
|
|
var h mail.AttachmentHeader
|
|
h.Set("Content-Type", att.Header.Get("Content-Type"))
|
|
h.SetFilename(att.Filename)
|
|
|
|
aw, err := mw.CreateAttachment(h)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to create attachment: %v", err)
|
|
}
|
|
defer aw.Close()
|
|
|
|
f, err := att.Open()
|
|
if err != nil {
|
|
return fmt.Errorf("failed to open attachment: %v", err)
|
|
}
|
|
defer f.Close()
|
|
|
|
if _, err := io.Copy(aw, f); err != nil {
|
|
return fmt.Errorf("failed to write attachment: %v", err)
|
|
}
|
|
|
|
if err := f.Close(); err != nil {
|
|
return fmt.Errorf("failed to close attachment: %v", err)
|
|
}
|
|
if err := aw.Close(); err != nil {
|
|
return fmt.Errorf("failed to close attachment writer: %v", err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
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)
|
|
}
|
|
if msg.InReplyTo != "" {
|
|
h.Set("In-Reply-To", msg.InReplyTo)
|
|
}
|
|
// TODO: set Message-ID
|
|
|
|
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)
|
|
}
|
|
|
|
for _, att := range msg.Attachments {
|
|
if err := writeAttachment(mw, att); err != nil {
|
|
return 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
|
|
}
|