Initial cloud-services repo - gateway service + pkg modules

pkg/smtpclient/smtp.go

@@ -0,0 +1,61 @@
+package smtpclient
+
+import (
+	"fmt"
+	"net/smtp"
+	"strings"
+
+	"github.com/pkg/errors"
+)
+
+var ErrAuthRequired = errors.New("auth required")
+
+const CRLF = "\r\n"
+const FromEmail = "no-reply@fiskerinc.com"
+
+type SMTPInterface interface {
+	Auth(username string, password string)
+	Send(from string, to []string, subject string, body string) error
+	Close()
+}
+
+func NewSMTP(host string, port int) SMTPInterface {
+	return &SMTP{
+		Host: host,
+		Port: port,
+	}
+}
+
+type SMTP struct {
+	Host     string
+	Port     int
+	Username string
+	auth     smtp.Auth
+}
+
+func (s *SMTP) Auth(username string, password string) {
+	s.auth = smtp.PlainAuth("", username, password, s.Host)
+}
+
+func (s *SMTP) Send(from string, to []string, subject string, body string) error {
+	if s.auth == nil {
+		return ErrAuthRequired
+	}
+
+	msg := []string{
+		fmt.Sprintf("From: %s", from),
+		fmt.Sprintf("To: %s", strings.Join(to, ", ")),
+		fmt.Sprintf("Subject: %s", subject),
+		"",
+		fmt.Sprintf("%s%s", body, CRLF),
+	}
+	addr := fmt.Sprintf("%s:%d", s.Host, s.Port)
+
+	return smtp.SendMail(addr, s.auth, from, to, []byte(strings.Join(msg, CRLF)))
+}
+
+func (s *SMTP) Close() {
+	s.Host = ""
+	s.Username = ""
+	s.auth = nil
+}