1 files changed, 73 insertions, 0 deletions
diff --git a/mailing/sendmail_mailer.go b/mailing/sendmail_mailer.go
new file mode 100644
index 0000000..ad864fb
--- /dev/null
+++ b/mailing/sendmail_mailer.go
@@ -0,0 +1,73 @@
+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
+}