E-mail sender

mail/service.go

@@ -0,0 +1,72 @@
+package mail
+
+import (
+	"fmt"
+	"net/smtp"
+	"strings"
+	"text/template"
+
+	"github.com/kataras/iris/config"
+	"github.com/kataras/iris/utils"
+)
+
+const tmpl = `From: {{.From}}<br /> To: {{.To}}<br /> Subject: {{.Subject}}<br /> MIME-version: 1.0<br /> Content-Type: text/html; charset=&quot;UTF-8&quot;<br /> <br /> {{.Body}}`
+
+var buf = utils.NewBufferPool(64)
+
+type (
+	// Service is the interface which mail sender should implement
+	Service interface {
+		// Send sends a mail to recipients
+		// the body can be html also
+		Send(to []string, subject, body string) error
+	}
+
+	mailer struct {
+		config        config.Mail
+		auth          smtp.Auth
+		authenticated bool
+	}
+)
+
+// New creates and returns a new Service
+func New(cfg config.Mail) Service {
+	return &mailer{config: cfg}
+}
+
+func (m *mailer) authenticate() error {
+	if m.config.Username == "" || m.config.Password == "" || m.config.Host == "" {
+		return fmt.Errorf("Username, Password & Host cannot be empty!")
+	}
+	m.auth = smtp.PlainAuth("", m.config.Username, m.config.Password, m.config.Host)
+	m.authenticated = true
+	return nil
+}
+
+// Send sends a mail to recipients
+// the body can be html also
+func (m *mailer) Send(to []string, subject, body string) error {
+	buffer := buf.Get()
+	defer buf.Put(buffer)
+
+	if !m.authenticated {
+		if err := m.authenticate(); err != nil {
+			return err
+		}
+	}
+
+	mailArgs := map[string]string{"To": strings.Join(to, ","), "Subject": subject, "Body": body}
+	template := template.Must(template.New("mailTmpl").Parse(tmpl))
+
+	if err := template.Execute(buffer, mailArgs); err != nil {
+		return err
+	}
+
+	return smtp.SendMail(
+		fmt.Sprintf("%s:%d", m.config.Host, m.config.Port),
+		m.auth,
+		m.config.Username,
+		to,
+		buffer.Bytes(),
+	)
+}