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email.go
2.74 KB
bca3975fd
email
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package webutility
// TODO(markO): test test test test test (and open source?)
import (
"crypto/tls"
"errors"
"fmt"
"net/smtp"
"strings"
)
type EmailConfig struct {
ServerName string
Identity string
Username string
Password string
Host string
Port int
}
func NewEmailConfig(ident, uname, pword, host string, port int) *EmailConfig {
return &EmailConfig{
ServerName: host + fmt.Sprintf(":%d", port),
Identity: ident,
Username: uname,
Password: pword,
Host: host,
Port: port,
}
}
type Email struct {
To []string
From string
Subject string
Body string
}
func NewEmail(to []string, from, subject, body string) *Email {
return &Email{
To: to,
From: from,
Subject: subject,
Body: body,
}
}
func SendEmail(email *Email, conf *EmailConfig) error {
if email == nil {
return errors.New("no email to send")
}
if conf == nil {
// use (some?) default settings
conf = NewEmailConfig("", "marko.tikvic@to-net.rs", "quantumleap010", "mail.to-net.rs", 25)
}
c, err := smtp.Dial(conf.ServerName)
if err != nil {
return err
}
defer c.Close()
// not sure if this is needed
//if err = c.Hello(conf.ServerName); err != nil {
// return err
//}
if ok, _ := c.Extension("STARTTLS"); ok {
// disable stupid tls check for self-signed certificates
config := &tls.Config{
ServerName: conf.ServerName,
InsecureSkipVerify: true,
}
// for golang testing
//if testHookStartTLS != nil {
// testHookStartTLS(config)
//}
if err = c.StartTLS(config); err != nil {
return err
}
}
/*
// don't know what to do with this
if a != nil && c.ext != nil {
if _, ok := c.ext["AUTH"]; !ok {
return errors.New("smtp: server doesn't support AUTH")
}
if err = c.Auth(a); err != nil {
return err
}
}
*/
// Set up authentication information.
auth := smtp.PlainAuth(conf.Identity, conf.Username, conf.Password, conf.Host)
if err = c.Auth(auth); err != nil {
return err
}
if err = c.Mail(email.From); err != nil {
return err
}
for _, addr := range email.To {
if err = c.Rcpt(addr); err != nil {
return err
}
}
w, err := c.Data()
if err != nil {
return err
}
_, err = w.Write(email.Bytes())
if err != nil {
return err
}
err = w.Close()
if err != nil {
return err
}
return c.Quit()
}
func (e *Email) String() string {
var str strings.Builder
str.WriteString("From:" + e.From + "\r
")
str.WriteString("To:")
for i, _ := range e.To {
if i > 0 {
str.WriteString(",")
}
str.WriteString(e.To[i])
}
str.WriteString("\r
")
str.WriteString("Subject:" + e.Subject + "\r
")
// body
str.WriteString("\r
" + e.Body + "\r
")
return str.String()
}
func (e *Email) Bytes() []byte {
return []byte(e.String())
}
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