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sendmail.go
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sendmail.go
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package mailer
import (
"bytes"
"errors"
"mime"
"net/http"
"os/exec"
"strings"
)
var _ Mailer = (*Sendmail)(nil)
// Sendmail implements [mailer.Mailer] interface and defines a mail
// client that sends emails via the "sendmail" *nix command.
//
// This client is usually recommended only for development and testing.
type Sendmail struct {
}
// Send implements `mailer.Mailer` interface.
func (c *Sendmail) Send(m *Message) error {
toAddresses := addressesToStrings(m.To, false)
headers := make(http.Header)
headers.Set("Subject", mime.QEncoding.Encode("utf-8", m.Subject))
headers.Set("From", m.From.String())
headers.Set("Content-Type", "text/html; charset=UTF-8")
headers.Set("To", strings.Join(toAddresses, ","))
cmdPath, err := findSendmailPath()
if err != nil {
return err
}
var buffer bytes.Buffer
// write
// ---
if err := headers.Write(&buffer); err != nil {
return err
}
if _, err := buffer.Write([]byte("\r\n")); err != nil {
return err
}
if m.HTML != "" {
if _, err := buffer.Write([]byte(m.HTML)); err != nil {
return err
}
} else {
if _, err := buffer.Write([]byte(m.Text)); err != nil {
return err
}
}
// ---
sendmail := exec.Command(cmdPath, strings.Join(toAddresses, ","))
sendmail.Stdin = &buffer
return sendmail.Run()
}
func findSendmailPath() (string, error) {
options := []string{
"/usr/sbin/sendmail",
"/usr/bin/sendmail",
"sendmail",
}
for _, option := range options {
path, err := exec.LookPath(option)
if err == nil {
return path, err
}
}
return "", errors.New("Failed to locate a sendmail executable path.")
}