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watchtower/pkg/notifications/smtp.go

78 lines
2.1 KiB
Go

// Package notifications ...
// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license.
package notifications
import (
"crypto/tls"
"net"
"net/smtp"
)
// SendMail connects to the server at addr, switches to TLS if
// possible, authenticates with the optional mechanism a if possible,
// and then sends an email from address from, to addresses to, with
// message msg.
// The addr must include a port, as in "mail.example.com:smtp".
//
// The addresses in the to parameter are the SMTP RCPT addresses.
//
// The msg parameter should be an RFC 822-style email with headers
// first, a blank line, and then the message body. The lines of msg
// should be CRLF terminated. The msg headers should usually include
// fields such as "From", "To", "Subject", and "Cc". Sending "Bcc"
// messages is accomplished by including an email address in the to
// parameter but not including it in the msg headers.
//
// The SendMail function and the net/smtp package are low-level
// mechanisms and provide no support for DKIM signing, MIME
// attachments (see the mime/multipart package), or other mail
// functionality. Higher-level packages exist outside of the standard
// library.
func SendMail(addr string, insecureSkipVerify bool, a smtp.Auth, from string, to []string, msg []byte) error {
c, err := smtp.Dial(addr)
if err != nil {
return err
}
defer c.Close()
if err = c.Hello("localHost"); err != nil {
return err
}
if ok, _ := c.Extension("STARTTLS"); ok {
serverName, _, _ := net.SplitHostPort(addr)
config := &tls.Config{ServerName: serverName, InsecureSkipVerify: insecureSkipVerify}
if err = c.StartTLS(config); err != nil {
return err
}
}
if a != nil {
if ok, _ := c.Extension("AUTH"); ok {
if err = c.Auth(a); err != nil {
return err
}
}
}
if err = c.Mail(from); err != nil {
return err
}
for _, addr := range to {
if err = c.Rcpt(addr); err != nil {
return err
}
}
w, err := c.Data()
if err != nil {
return err
}
_, err = w.Write(msg)
if err != nil {
return err
}
err = w.Close()
if err != nil {
return err
}
return c.Quit()
}