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mailer.go
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mailer.go
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// Copyright 2014 The Gogs Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package notifications
import (
"crypto/tls"
"fmt"
"net"
"net/mail"
"net/smtp"
"os"
"strings"
"github.com/grafana/grafana/pkg/log"
"github.com/grafana/grafana/pkg/setting"
)
var mailQueue chan *Message
func initMailQueue() {
mailQueue = make(chan *Message, 10)
go processMailQueue()
}
func processMailQueue() {
for {
select {
case msg := <-mailQueue:
num, err := buildAndSend(msg)
tos := strings.Join(msg.To, "; ")
info := ""
if err != nil {
if len(msg.Info) > 0 {
info = ", info: " + msg.Info
}
log.Error(4, fmt.Sprintf("Async sent email %d succeed, not send emails: %s%s err: %s", num, tos, info, err))
} else {
log.Trace(fmt.Sprintf("Async sent email %d succeed, sent emails: %s%s", num, tos, info))
}
}
}
}
var addToMailQueue = func(msg *Message) {
mailQueue <- msg
}
func sendToSmtpServer(recipients []string, msgContent []byte) error {
host, port, err := net.SplitHostPort(setting.Smtp.Host)
if err != nil {
return err
}
tlsconfig := &tls.Config{
InsecureSkipVerify: setting.Smtp.SkipVerify,
ServerName: host,
}
if setting.Smtp.CertFile != "" {
cert, err := tls.LoadX509KeyPair(setting.Smtp.CertFile, setting.Smtp.KeyFile)
if err != nil {
return err
}
tlsconfig.Certificates = []tls.Certificate{cert}
}
conn, err := net.Dial("tcp", net.JoinHostPort(host, port))
if err != nil {
return err
}
defer conn.Close()
isSecureConn := false
// Start TLS directly if the port ends with 465 (SMTPS protocol)
if strings.HasSuffix(port, "465") {
conn = tls.Client(conn, tlsconfig)
isSecureConn = true
}
client, err := smtp.NewClient(conn, host)
if err != nil {
return err
}
hostname, err := os.Hostname()
if err != nil {
return err
}
if err = client.Hello(hostname); err != nil {
return err
}
// If not using SMTPS, alway use STARTTLS if available
hasStartTLS, _ := client.Extension("STARTTLS")
if !isSecureConn && hasStartTLS {
if err = client.StartTLS(tlsconfig); err != nil {
return err
}
}
canAuth, options := client.Extension("AUTH")
if canAuth && len(setting.Smtp.User) > 0 {
var auth smtp.Auth
if strings.Contains(options, "CRAM-MD5") {
auth = smtp.CRAMMD5Auth(setting.Smtp.User, setting.Smtp.Password)
} else if strings.Contains(options, "PLAIN") {
auth = smtp.PlainAuth("", setting.Smtp.User, setting.Smtp.Password, host)
}
if auth != nil {
if err = client.Auth(auth); err != nil {
return err
}
}
}
if fromAddress, err := mail.ParseAddress(setting.Smtp.FromAddress); err != nil {
return err
} else {
if err = client.Mail(fromAddress.Address); err != nil {
return err
}
}
for _, rec := range recipients {
if err = client.Rcpt(rec); err != nil {
return err
}
}
w, err := client.Data()
if err != nil {
return err
}
if _, err = w.Write([]byte(msgContent)); err != nil {
return err
}
if err = w.Close(); err != nil {
return err
}
return client.Quit()
}
func buildAndSend(msg *Message) (int, error) {
log.Trace("Sending mails to: %s", strings.Join(msg.To, "; "))
// get message body
content := msg.Content()
if len(msg.To) == 0 {
return 0, fmt.Errorf("empty receive emails")
} else if len(msg.Body) == 0 {
return 0, fmt.Errorf("empty email body")
}
if msg.Massive {
// send mail to multiple emails one by one
num := 0
for _, to := range msg.To {
body := []byte("To: " + to + "\r\n" + content)
err := sendToSmtpServer([]string{to}, body)
if err != nil {
return num, err
}
num++
}
return num, nil
} else {
body := []byte("To: " + strings.Join(msg.To, ";") + "\r\n" + content)
// send to multiple emails in one message
err := sendToSmtpServer(msg.To, body)
if err != nil {
return 0, err
} else {
return 1, nil
}
}
}