storj/internal/post/sender.go

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// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information
package post
import (
"crypto/tls"
"net"
"net/mail"
"net/smtp"
"github.com/zeebo/errs"
)
// Address is alias of net/mail.Address
type Address = mail.Address
// SMTPSender is smtp sender
type SMTPSender struct {
ServerAddress string
From Address
Auth smtp.Auth
}
// FromAddress implements satellite/mail.SMTPSender
func (sender *SMTPSender) FromAddress() Address {
return sender.From
}
// SendEmail sends email message to the given recipient
func (sender *SMTPSender) SendEmail(msg *Message) error {
// TODO: validate address before initializing SMTPSender
// suppress error because address should be validated
// before creating SMTPSender
host, _, _ := net.SplitHostPort(sender.ServerAddress)
client, err := smtp.Dial(sender.ServerAddress)
if err != nil {
return err
}
// close underlying connection
defer func() {
err = errs.Combine(err, client.Close())
}()
// send smtp hello or ehlo msg and establish connection over tls
err = client.StartTLS(&tls.Config{ServerName: host})
if err != nil {
return err
}
err = client.Auth(sender.Auth)
if err != nil {
return err
}
err = client.Mail(sender.From.Address)
if err != nil {
return err
}
// add recipients
for _, to := range msg.To {
err = client.Rcpt(to.Address)
if err != nil {
return err
}
}
data, err := client.Data()
if err != nil {
return err
}
defer func() {
err = errs.Combine(err, data.Close())
}()
_, err = data.Write(msg.Bytes())
if err != nil {
return err
}
// send quit msg to stop gracefully returns err on
// success but we don't really care about the result
_ = client.Quit()
return nil
}