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smtp.go
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smtp.go
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package tools
import (
"bytes"
"crypto/tls"
"fmt"
"log"
"mime"
"net"
"net/mail"
"net/smtp"
)
type SMTPConfig struct {
Host string `long:"host" env:"HOST" description:"smtp host value"`
Port string `long:"port" env:"PORT" description:"smtp port value"`
Name string `long:"name" env:"NAME" description:"smtp name value"`
Email string `long:"email" env:"EMAIL" description:"smtp email value"`
Login string `long:"login" env:"LOGIN" description:"smtp login value"`
Password string `long:"password" env:"PASSWORD" description:"smtp password value"`
}
// NewSMTP - конструктор для создания SMTP с настройками из конфига.
func NewSMTP(config SMTPConfig) *SMTP {
return &SMTP{pref: config}
}
// NewConfiguredSMTP - конструктор для создания SMTP с настроенными параметрами.
func NewConfiguredSMTP(host, port, name, email, login, password string) *SMTP {
return &SMTP{
pref: SMTPConfig{
Host: host,
Port: port,
Name: name,
Email: email,
Login: login,
Password: password,
},
}
}
// SMTP - структура для отправки писем.
type SMTP struct {
pref SMTPConfig
}
// Метод отправляет текстовое письмо указанному адресату.
func (s *SMTP) SendTextEmail(name, email, subject, message string) error {
return s.sendEmail(name, email, subject, "text/plain", []byte(message))
}
// Метод отправляет HTML письмо указанному адресату.
func (s *SMTP) SendHTMLEmail(name, email, subject string, message []byte) error {
return s.sendEmail(name, email, subject, "text/html", message)
}
func (s *SMTP) sendEmail(name, email, subject, mime string, message []byte) error {
from, to := s.addresses(name, email)
auth := smtp.PlainAuth("", s.pref.Login, s.pref.Password, s.pref.Host)
client, err := s.smtp()
if err != nil {
return err
}
err = client.Auth(auth)
if err != nil {
return err
}
err = client.Mail(from.Address)
if err != nil {
return err
}
err = client.Rcpt(to.Address)
if err != nil {
return err
}
wr, err := client.Data()
defer func() {
err := wr.Close()
if err != nil {
log.Println(err)
}
}()
if err != nil {
return err
}
_, _ = wr.Write(s.message(from, to, subject, mime, message))
return client.Quit()
}
func (m *SMTP) addresses(name, email string) (from, to mail.Address) {
from = mail.Address{Name: m.pref.Name, Address: m.pref.Email}
to = mail.Address{Name: name, Address: email}
return
}
func (m *SMTP) message(from, to mail.Address, subject, mimeType string, message []byte) []byte {
buffer := new(bytes.Buffer)
buffer.WriteString(fmt.Sprintf("From: %s\r\n", from.String()))
buffer.WriteString(fmt.Sprintf("To: %s\r\n", to.String()))
buffer.WriteString(fmt.Sprintf("Subject: %s\r\n", mime.QEncoding.Encode("utf-8", subject)))
buffer.WriteString(fmt.Sprintf("MIME-Version: 1.0;\r\nContent-Type: %s; charset=\"UTF-8\"\r\n\r\n", mimeType))
buffer.Write(message)
return buffer.Bytes()
}
func (m *SMTP) smtp() (*smtp.Client, error) {
servername := m.pref.Host + ":" + m.pref.Port
host, _, _ := net.SplitHostPort(servername)
tlsconfig := &tls.Config{
InsecureSkipVerify: true,
ServerName: m.pref.Host,
}
// Вызов tcp соедиения
conn, err := tls.Dial("tcp", servername, tlsconfig)
if err != nil {
return nil, err
}
return smtp.NewClient(conn, host)
}