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package mailing
import (
"errors"
"fmt"
"github.com/kch42/simpleconf"
"os/exec"
)
// SendmailMailer is a Mailer implementation that sends mail using a sendmail-ish executable.
//
// Sendmail-ish in this context means:
//
// * The executable must accept the from address using the `-f <addr>` switch
// * The executable must accept the to address as a parameter
// * The executable expects a mail (including all headers) on stdin that is terminated by EOF
type SendmailMailer struct {
Exec string
Args []string
}
func (sm SendmailMailer) Mail(to, from string, msg []byte) (outerr error) {
off := len(sm.Args)
args := make([]string, off+3)
copy(args, sm.Args)
args[off] = "-f"
args[off+1] = from
args[off+2] = to
cmd := exec.Command(sm.Exec, args...)
pipe, err := cmd.StdinPipe()
if err != nil {
return err
}
if err = cmd.Start(); err != nil {
return err
}
defer func() {
pipe.Close()
err := cmd.Wait()
if outerr == nil {
outerr = err
}
}()
_, err = pipe.Write(msg)
return err
}
// SendmailMailerCreator creates an SendmailMailer using configuration values in the [mail] section.
//
// exec - The name of the executable
// argX - (optional) Additional arguments for the executable. X is a ascending number starting with 1
func SendmailMailerCreator(conf simpleconf.Config) (Mailer, error) {
rv := SendmailMailer{}
var err error
if rv.Exec, err = conf.GetString("mail", "exec"); err != nil {
return rv, errors.New("Missing [mail] exec config")
}
for i := 1; ; i++ {
arg, err := conf.GetString("mail", fmt.Sprintf("arg%d", i))
if err != nil {
break
}
rv.Args = append(rv.Args, arg)
}
return rv, nil
}
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