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// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package utils
import (
"crypto/tls"
"fmt"
l4g "github.com/alecthomas/log4go"
"github.com/mattermost/platform/model"
"mime"
"net"
"net/mail"
"net/smtp"
"time"
)
func encodeRFC2047Word(s string) string {
return mime.BEncoding.Encode("utf-8", s)
}
func connectToSMTPServer(config *model.Config) (net.Conn, *model.AppError) {
var conn net.Conn
var err error
if config.EmailSettings.ConnectionSecurity == model.CONN_SECURITY_TLS {
tlsconfig := &tls.Config{
InsecureSkipVerify: *config.EmailSettings.SkipServerCertificateVerification,
ServerName: config.EmailSettings.SMTPServer,
}
conn, err = tls.Dial("tcp", config.EmailSettings.SMTPServer+":"+config.EmailSettings.SMTPPort, tlsconfig)
if err != nil {
return nil, model.NewLocAppError("SendMail", "utils.mail.connect_smtp.open_tls.app_error", nil, err.Error())
}
} else {
conn, err = net.Dial("tcp", config.EmailSettings.SMTPServer+":"+config.EmailSettings.SMTPPort)
if err != nil {
return nil, model.NewLocAppError("SendMail", "utils.mail.connect_smtp.open.app_error", nil, err.Error())
}
}
return conn, nil
}
func newSMTPClient(conn net.Conn, config *model.Config) (*smtp.Client, *model.AppError) {
c, err := smtp.NewClient(conn, config.EmailSettings.SMTPServer+":"+config.EmailSettings.SMTPPort)
if err != nil {
l4g.Error(T("utils.mail.new_client.open.error"), err)
return nil, model.NewLocAppError("SendMail", "utils.mail.connect_smtp.open_tls.app_error", nil, err.Error())
}
hostname := GetHostnameFromSiteURL(*config.ServiceSettings.SiteURL)
if hostname != "" {
err := c.Hello(hostname)
if err != nil {
l4g.Error(T("utils.mail.new_client.helo.error"), err)
return nil, model.NewLocAppError("SendMail", "utils.mail.connect_smtp.helo.app_error", nil, err.Error())
}
}
auth := smtp.PlainAuth("", config.EmailSettings.SMTPUsername, config.EmailSettings.SMTPPassword, config.EmailSettings.SMTPServer+":"+config.EmailSettings.SMTPPort)
if config.EmailSettings.ConnectionSecurity == model.CONN_SECURITY_TLS {
if err = c.Auth(auth); err != nil {
return nil, model.NewLocAppError("SendMail", "utils.mail.new_client.auth.app_error", nil, err.Error())
}
} else if config.EmailSettings.ConnectionSecurity == model.CONN_SECURITY_STARTTLS {
tlsconfig := &tls.Config{
InsecureSkipVerify: *config.EmailSettings.SkipServerCertificateVerification,
ServerName: config.EmailSettings.SMTPServer,
}
c.StartTLS(tlsconfig)
if err = c.Auth(auth); err != nil {
return nil, model.NewLocAppError("SendMail", "utils.mail.new_client.auth.app_error", nil, err.Error())
}
} else if config.EmailSettings.ConnectionSecurity == model.CONN_SECURITY_PLAIN {
// note: go library only supports PLAIN auth over non-tls connections
if err = c.Auth(auth); err != nil {
return nil, model.NewLocAppError("SendMail", "utils.mail.new_client.auth.app_error", nil, err.Error())
}
}
return c, nil
}
func TestConnection(config *model.Config) {
if !config.EmailSettings.SendEmailNotifications {
return
}
conn, err1 := connectToSMTPServer(config)
if err1 != nil {
l4g.Error(T("utils.mail.test.configured.error"), T(err1.Message), err1.DetailedError)
return
}
defer conn.Close()
c, err2 := newSMTPClient(conn, config)
if err2 != nil {
l4g.Error(T("utils.mail.test.configured.error"), T(err2.Message), err2.DetailedError)
return
}
defer c.Quit()
defer c.Close()
}
func SendMail(to, subject, body string) *model.AppError {
return SendMailUsingConfig(to, subject, body, Cfg)
}
func SendMailUsingConfig(to, subject, body string, config *model.Config) *model.AppError {
if !config.EmailSettings.SendEmailNotifications || len(config.EmailSettings.SMTPServer) == 0 {
return nil
}
l4g.Debug(T("utils.mail.send_mail.sending.debug"), to, subject)
fromMail := mail.Address{Name: config.EmailSettings.FeedbackName, Address: config.EmailSettings.FeedbackEmail}
toMail := mail.Address{Name: "", Address: to}
headers := make(map[string]string)
headers["From"] = fromMail.String()
headers["To"] = toMail.String()
headers["Subject"] = encodeRFC2047Word(subject)
headers["MIME-version"] = "1.0"
headers["Content-Type"] = "text/html; charset=\"utf-8\""
headers["Content-Transfer-Encoding"] = "8bit"
headers["Date"] = time.Now().Format(time.RFC1123Z)
message := ""
for k, v := range headers {
message += fmt.Sprintf("%s: %s\r\n", k, v)
}
message += "\r\n<html><body>" + body + "</body></html>"
conn, err1 := connectToSMTPServer(config)
if err1 != nil {
return err1
}
defer conn.Close()
c, err2 := newSMTPClient(conn, config)
if err2 != nil {
return err2
}
defer c.Quit()
defer c.Close()
if err := c.Mail(fromMail.Address); err != nil {
return model.NewLocAppError("SendMail", "utils.mail.send_mail.from_address.app_error", nil, err.Error())
}
if err := c.Rcpt(toMail.Address); err != nil {
return model.NewLocAppError("SendMail", "utils.mail.send_mail.to_address.app_error", nil, err.Error())
}
w, err := c.Data()
if err != nil {
return model.NewLocAppError("SendMail", "utils.mail.send_mail.msg_data.app_error", nil, err.Error())
}
_, err = w.Write([]byte(message))
if err != nil {
return model.NewLocAppError("SendMail", "utils.mail.send_mail.msg.app_error", nil, err.Error())
}
err = w.Close()
if err != nil {
return model.NewLocAppError("SendMail", "utils.mail.send_mail.close.app_error", nil, err.Error())
}
return nil
}
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