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wakapi/services/mail/smtp.go

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package mail
import (
"errors"
"github.com/emersion/go-sasl"
"github.com/emersion/go-smtp"
conf "github.com/muety/wakapi/config"
"github.com/muety/wakapi/models"
"io"
)
type SMTPSendingService struct {
config conf.SMTPMailConfig
auth sasl.Client
}
func NewSMTPSendingService(config conf.SMTPMailConfig) *SMTPSendingService {
return &SMTPSendingService{
config: config,
auth: sasl.NewPlainClient(
"",
config.Username,
config.Password,
),
}
}
func (s *SMTPSendingService) Send(mail *models.Mail) error {
dial := smtp.Dial
if s.config.TLS {
dial = func(addr string) (*smtp.Client, error) {
return smtp.DialTLS(addr, nil)
}
}
c, err := dial(s.config.ConnStr())
if err != nil {
return err
}
defer c.Close()
if ok, _ := c.Extension("STARTTLS"); ok {
if err = c.StartTLS(nil); err != nil {
errCode := err.(*smtp.SMTPError).Code
if errCode == 503 {
// TLS already active
} else {
return err
}
}
}
if s.auth != nil {
if ok, _ := c.Extension("AUTH"); !ok {
return errors.New("smtp: server doesn't support AUTH")
}
if len(s.config.Username) == 0 || len(s.config.Password) == 0 {
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return errors.New("smtp: server requires authentication, but no authentication is provided")
}
if err = c.Auth(s.auth); err != nil {
return err
}
}
if err = c.Mail(mail.From.Raw(), nil); err != nil {
return err
}
for _, addr := range mail.To.RawStrings() {
if err = c.Rcpt(addr); err != nil {
return err
}
}
w, err := c.Data()
if err != nil {
return err
}
_, err = io.Copy(w, mail.Reader())
if err != nil {
return err
}
err = w.Close()
if err != nil {
return err
}
return c.Quit()
}