make Mailer an interface

email/smtp.go

@@ -0,0 +1,63 @@
+package email
+
+import (
+	"github.com/go-mail/mail"
+	"github.com/spf13/viper"
+)
+
+// SMTPMailer is a SMTP mailer.
+type SMTPMailer struct {
+	client *mail.Dialer
+	from   Email
+}
+
+// NewMailer returns a configured SMTP Mailer.
+func NewMailer() (Mailer, error) {
+	if err := parseTemplates(); err != nil {
+		return nil, err
+	}
+
+	smtp := struct {
+		Host     string
+		Port     int
+		User     string
+		Password string
+	}{
+		viper.GetString("email_smtp_host"),
+		viper.GetInt("email_smtp_port"),
+		viper.GetString("email_smtp_user"),
+		viper.GetString("email_smtp_password"),
+	}
+
+	if smtp.Host == "" {
+		return NewMockMailer(), nil
+	}
+
+	s := &SMTPMailer{
+		client: mail.NewDialer(smtp.Host, smtp.Port, smtp.User, smtp.Password),
+		from:   NewEmail(viper.GetString("email_from_name"), viper.GetString("email_from_address")),
+	}
+
+	d, err := s.client.Dial()
+	if err == nil {
+		d.Close()
+		return s, nil
+	}
+	return nil, err
+}
+
+// Send sends the mail via smtp.
+func (m *SMTPMailer) Send(email Message) error {
+	if err := email.parse(); err != nil {
+		return err
+	}
+
+	msg := mail.NewMessage()
+	msg.SetAddressHeader("From", email.From.Address, email.From.Name)
+	msg.SetAddressHeader("To", email.To.Address, email.To.Name)
+	msg.SetHeader("Subject", email.Subject)
+	msg.SetBody("text/plain", email.text)
+	msg.AddAlternative("text/html", email.html)
+
+	return m.client.DialAndSend(msg)
+}