refactor: insecure no auth/tls

pkg/email/email.go

@@ -18,6 +18,19 @@ const (
 	delimeter = "**=myohmy689407924327"
 )
 
+type InsecureConfig struct {
+	Host string
+	Port string
+	From string // Sender email address
+}
+
+type SecureConfig struct {
+	Auth smtp.Auth
+	Host string
+	Port string
+	From string // Sender email address
+}
+
 type EmailMessage struct {
 	To          string
 	Subject     string
@@ -46,7 +59,16 @@ type EmailService struct {
 	dial      SmtpDialFn
 }
 
-func NewInsecure(config MailServiceConfig) *EmailService {
+func NewInsecureNoAuth(config InsecureConfig) *EmailService {
+	return &EmailService{
+		host: config.Host,
+		port: config.Port,
+		from: config.From,
+		dial: dial,
+	}
+}
+
+func NewInsecure(config SecureConfig) *EmailService {
 	return &EmailService{
 		auth: config.Auth,
 		host: config.Host,
@@ -121,7 +143,7 @@ func customVerify(host string) func(cs tls.ConnectionState) error {
 	}
 }
 
-func NewSecure(config MailServiceConfig) *EmailService {
+func NewSecure(config SecureConfig) *EmailService {
 	return &EmailService{
 		auth: config.Auth,
 		host: config.Host,
@@ -136,7 +158,7 @@ func NewSecure(config MailServiceConfig) *EmailService {
 	}
 }
 
-func NewSecure465(config MailServiceConfig) *EmailService {
+func NewSecure465(config SecureConfig) *EmailService {
 	tlsCfg := tls.Config{
 		// Ideally, InsecureSkipVerify: false,
 		// or do a proper certificate validation
@@ -156,13 +178,6 @@ func NewSecure465(config MailServiceConfig) *EmailService {
 	}
 }
 
-type MailServiceConfig struct {
-	Auth smtp.Auth
-	Host string
-	Port string
-	From string // Sender email address
-}
-
 func dial(hostPort string) (SMTPClientIface, error) {
 	client, err := smtp.Dial(hostPort)
 	if err != nil {
@@ -212,13 +227,17 @@ func (e *EmailService) send(to string, msg []byte) error {
 		return fmt.Errorf("DIAL: %s", err)
 	}
 
-	if err = c.StartTLS(e.tlsconfig); err != nil {
-		return fmt.Errorf("c.StartTLS: %s", err)
+	if e.tlsconfig != nil {
+		if err = c.StartTLS(e.tlsconfig); err != nil {
+			return fmt.Errorf("c.StartTLS: %s", err)
+		}
 	}
 
 	// Auth
-	if err = c.Auth(e.auth); err != nil {
-		return fmt.Errorf("c.Auth: %s", err)
+	if e.auth != nil {
+		if err = c.Auth(e.auth); err != nil {
+			return fmt.Errorf("c.Auth: %s", err)
+		}
 	}
 
 	// To && From