vain/mail.go

70 lines
1.5 KiB
Go

package vain
import (
"bytes"
"fmt"
"net/mail"
"net/smtp"
)
// A Mailer is a type that knows how to send smtp mail.
type Mailer interface {
Send(to mail.Address, subject, msg string) error
}
// NewMail returns *Send struct to be able to send smtp
// or an error if it can't correctly parse the email address.
func NewMail(from, host string, port int) (*Mail, error) {
if _, err := mail.ParseAddress(from); err != nil {
return nil, fmt.Errorf("can't parse an email address for 'from': %v", err)
}
r := &Mail{
host: host,
port: port,
from: from,
}
return r, nil
}
// Mail stores information required to use smtp.
type Mail struct {
host string
port int
from string
}
// Send sends a smtp email using the host and port in the Mail struct and
//returns an error if there was a problem sending the email.
func (e Mail) Send(to mail.Address, subject, msg string) error {
c, err := smtp.Dial(fmt.Sprintf("%s:%d", e.host, e.port))
if err != nil {
return fmt.Errorf("couldn't dial mail server: %v", err)
}
defer c.Close()
if err := c.Mail(e.from); err != nil {
return err
}
if err := c.Rcpt(to.String()); err != nil {
return err
}
wc, err := c.Data()
if err != nil {
return fmt.Errorf("problem sending mail: %v", err)
}
buf := bytes.NewBufferString("Subject: " + subject + "\n\n" + msg)
buf.WriteTo(wc)
if err := c.Quit(); err != nil {
return nil
}
return err
}
type mockMail struct {
msg string
}
func (m *mockMail) Send(to mail.Address, subject, msg string) error {
m.msg = msg
return nil
}