220 lines
4.7 KiB
Go
220 lines
4.7 KiB
Go
package alpsbase
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import (
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"bufio"
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"bytes"
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"fmt"
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"io"
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"io/ioutil"
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"mime"
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"mime/multipart"
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"strings"
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"time"
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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 quote(r io.Reader) (string, error) {
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scanner := bufio.NewScanner(r)
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var builder strings.Builder
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for scanner.Scan() {
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builder.WriteString("> ")
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builder.Write(scanner.Bytes())
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builder.WriteString("\n")
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}
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if err := scanner.Err(); err != nil {
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return "", fmt.Errorf("quote: failed to read original message: %s", err)
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}
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builder.WriteString("\n")
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return builder.String(), nil
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}
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type Attachment interface {
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MIMEType() string
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Filename() string
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Open() (io.ReadCloser, error)
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}
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type formAttachment struct {
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*multipart.FileHeader
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}
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func (att *formAttachment) Open() (io.ReadCloser, error) {
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return att.FileHeader.Open()
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}
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func (att *formAttachment) MIMEType() string {
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// TODO: retain params, e.g. "charset"?
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t, _, _ := mime.ParseMediaType(att.FileHeader.Header.Get("Content-Type"))
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return t
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}
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func (att *formAttachment) Filename() string {
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return att.FileHeader.Filename
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}
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type imapAttachment struct {
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Mailbox string
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Uid uint32
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Node *IMAPPartNode
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Body []byte
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}
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func (att *imapAttachment) Open() (io.ReadCloser, error) {
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if att.Body == nil {
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return nil, fmt.Errorf("IMAP attachment has not been pre-fetched")
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}
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return ioutil.NopCloser(bytes.NewReader(att.Body)), nil
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}
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func (att *imapAttachment) MIMEType() string {
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return att.Node.MIMEType
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}
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func (att *imapAttachment) Filename() string {
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return att.Node.Filename
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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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MessageID string
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InReplyTo string
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Text string
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Attachments []Attachment
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}
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func (msg *OutgoingMessage) ToString() string {
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return strings.Join(msg.To, ", ")
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}
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func writeAttachment(mw *mail.Writer, att Attachment) error {
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var h mail.AttachmentHeader
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h.SetContentType(att.MIMEType(), nil)
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h.SetFilename(att.Filename())
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aw, err := mw.CreateAttachment(h)
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if err != nil {
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return fmt.Errorf("failed to create attachment: %v", err)
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}
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defer aw.Close()
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f, err := att.Open()
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if err != nil {
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return fmt.Errorf("failed to open attachment: %v", err)
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}
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defer f.Close()
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if _, err := io.Copy(aw, f); err != nil {
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return fmt.Errorf("failed to write attachment: %v", err)
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}
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if err := f.Close(); err != nil {
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return fmt.Errorf("failed to close attachment: %v", err)
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}
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if err := aw.Close(); err != nil {
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return fmt.Errorf("failed to close attachment writer: %v", err)
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}
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return nil
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}
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func (msg *OutgoingMessage) WriteTo(w io.Writer) error {
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fromAddr, err := mail.ParseAddress(msg.From)
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if err != nil {
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return err
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}
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from := []*mail.Address{fromAddr}
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to := make([]*mail.Address, len(msg.To))
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for i, rcpt := range msg.To {
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addr, err := mail.ParseAddress(rcpt)
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if err != nil {
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return err
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}
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to[i] = 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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if msg.InReplyTo != "" {
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h.Set("In-Reply-To", msg.InReplyTo)
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}
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h.Set("Message-Id", msg.MessageID)
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if msg.MessageID == "" {
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panic(fmt.Errorf("Attempting to send message without message ID"))
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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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for _, att := range msg.Attachments {
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if err := writeAttachment(mw, att); err != nil {
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return err
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}
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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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addr, _ := mail.ParseAddress(msg.From)
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if err := c.Mail(addr.Address, 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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addr, _ := mail.ParseAddress(to)
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if err := c.Rcpt(addr.Address); err != nil {
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return fmt.Errorf("RCPT TO failed: %v (%s)", err, addr.Address)
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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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