tulip/mail/mail.go

97 lines
2.3 KiB
Go

package mail
import (
"bytes"
"github.com/emersion/go-message/mail"
"github.com/emersion/go-sasl"
"github.com/emersion/go-smtp"
"io"
"net"
"time"
)
type Mail struct {
Name string `json:"name"`
Tls bool `json:"tls"`
Server string `json:"server"`
From FromAddress `json:"from"`
Username string `json:"username"`
Password string `json:"password"`
}
func (m *Mail) loginInfo() sasl.Client {
return sasl.NewPlainClient("", m.Username, m.Password)
}
func (m *Mail) mailCall(to []string, r io.Reader) error {
host, _, err := net.SplitHostPort(m.Server)
if err != nil {
return err
}
if m.Tls {
return smtp.SendMailTLS(m.Server, m.loginInfo(), m.From.String(), to, r)
}
if host == "localhost" || host == "127.0.0.1" {
// internals of smtp.SendMail without STARTTLS for localhost testing
dial, err := smtp.Dial(m.Server)
if err != nil {
return err
}
err = dial.Auth(m.loginInfo())
if err != nil {
return err
}
return dial.SendMail(m.From.String(), to, r)
}
return smtp.SendMail(m.Server, m.loginInfo(), m.From.String(), to, r)
}
func (m *Mail) SendMail(subject string, to []*mail.Address, htmlBody, textBody io.Reader) error {
// generate the email in this template
buf := new(bytes.Buffer)
// setup mail headers
var h mail.Header
h.SetDate(time.Now())
h.SetSubject(subject)
h.SetAddressList("From", []*mail.Address{m.From.Address})
h.SetAddressList("To", to)
h.Set("Content-Type", "multipart/alternative")
// setup html and text alternative headers
var hHtml, hTxt mail.InlineHeader
hHtml.Set("Content-Type", "text/html; charset=utf-8")
hTxt.Set("Content-Type", "text/plain; charset=utf-8")
createWriter, err := mail.CreateWriter(buf, h)
if err != nil {
return err
}
inline, err := createWriter.CreateInline()
if err != nil {
return err
}
partHtml, err := inline.CreatePart(hHtml)
if err != nil {
return err
}
if _, err := io.Copy(partHtml, htmlBody); err != nil {
return err
}
partTxt, err := inline.CreatePart(hTxt)
if err != nil {
return err
}
if _, err := io.Copy(partTxt, textBody); err != nil {
return err
}
// convert all to addresses to strings
toStr := make([]string, len(to))
for i := range toStr {
toStr[i] = to[i].String()
}
return m.mailCall(toStr, buf)
}