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smtp-tls.go
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smtp-tls.go
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package main
import (
"crypto/tls"
"fmt"
"io"
"net"
"net/mail"
"net/smtp"
)
func isSmtpConfigured(smptpLogin string, smtpPassword string, smtpServer string) bool {
if smptpLogin == "" || smtpPassword == "" || smtpServer == "" {
return false
}
s, p, err := net.SplitHostPort(smtpServer)
if err != nil {
return false
}
if s == "" || p == "" {
return false
}
return true
}
func sendSmtpMail(fromEmail string, dest string, subj string, body string, smtpUsername string, smtpPassword string, smtpServer string, tlsCnx bool) error {
var w io.WriteCloser
from := mail.Address{"", fromEmail}
to := mail.Address{"", dest}
headers := make(map[string]string)
headers["From"] = from.String()
headers["To"] = to.String()
headers["Subject"] = subj
headers["MIME-version"] = "1.0"
headers["Content-Type"] = "text/html"
headers["charset"] = "UTF-8"
message := ""
for k, v := range headers {
message += fmt.Sprintf("%s: %s\r\n", k, v)
}
message += "\r\n" + body
host, _, err := net.SplitHostPort(smtpServer)
if err != nil {
return err
}
auth := smtp.PlainAuth("", smtpUsername, smtpPassword, host)
c, err := smtp.Dial(smtpServer)
if err != nil {
return err
}
defer c.Quit()
if tlsCnx {
tlsconfig := &tls.Config{
InsecureSkipVerify: false,
ServerName: host,
}
err = c.StartTLS(tlsconfig)
if err != nil {
return err
}
}
// Auth
if err = c.Auth(auth); err != nil {
return err
}
if err = c.Mail(from.Address); err != nil {
return err
}
if err = c.Rcpt(to.Address); err != nil {
return err
}
if w, err = c.Data(); err != nil {
return err
}
if _, err = w.Write([]byte(message)); err != nil {
return err
}
if err = w.Close(); err != nil {
return err
}
return err
}