email.go
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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 Email struct {
To []string
From string
Subject string
Body string
config *EmailConfig
}
func NewEmail() *Email {
return &Email{
To: nil,
From: "",
Subject: "",
Body: "",
config: nil,
}
}
func (e *Email) Config(cfg *EmailConfig) {
e.config = cfg
}
func (e *Email) SetFrom(from string) {
e.From = from
}
func (e *Email) SetTo(to []string) {
e.To = to
}
func (e *Email) SetSubject(sub string) {
e.Subject = sub
}
func (e *Email) SetBody(body string) {
e.Body = body
}
func (e *Email) String() string {
var str strings.Builder
str.WriteString("From:" + e.From + "\r\n")
str.WriteString("To:")
for i, _ := range e.To {
if i > 0 {
str.WriteString(",")
}
str.WriteString(e.To[i])
}
str.WriteString("\r\n")
str.WriteString("Subject:" + e.Subject + "\r\n")
// body
str.WriteString("\r\n" + e.Body + "\r\n")
return str.String()
}
func (e *Email) Bytes() []byte {
return []byte(e.String())
}
func (email *Email) Send() error {
if email.config == nil {
return errors.New("email configuration not provided")
}
conf := email.config
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()
}
type EmailConfig struct {
ServerName string `json:"-"`
Identity string `json:"-"`
Username string `json:"username"`
Password string `json:"password"`
Host string `json:"host"`
Port int `json:"port"`
}
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,
}
}