refac: removed 7 direct and 12 indirect go modules for custom code instead

internal/infrastructure/mailer/mailRepository.go

@@ -4,22 +4,47 @@ import (
 	domain "RenewCMS/internal/domain/mail"
 	"RenewCMS/internal/infrastructure/config"
 	"bytes"
+	"crypto/tls"
 	"embed"
 	"html/template"
 	"log"
-
-	"gopkg.in/gomail.v2"
+	"time"
 )
 
 type MailRepository struct {
-	smtp config.SmtpSettings
+	transport transport
+	sender    string
+	now       func() time.Time
+}
+
+type Option func(*options)
+
+type options struct {
+	tlsConfig *tls.Config
+	now       func() time.Time
+}
+
+func WithTLSConfig(tlsConfig *tls.Config) Option {
+	return func(o *options) { o.tlsConfig = tlsConfig }
+}
+
+func WithClock(now func() time.Time) Option {
+	return func(o *options) { o.now = now }
 }
 
 //go:embed templates/*
 var mailTemplateFiles embed.FS
 
-func NewMailRepository(smtp config.SmtpSettings) *MailRepository {
-	return &MailRepository{smtp: smtp}
+func NewMailRepository(smtp config.SmtpSettings, opts ...Option) *MailRepository {
+	configured := options{now: time.Now}
+	for _, opt := range opts {
+		opt(&configured)
+	}
+	return &MailRepository{
+		transport: newTransport(smtp, configured.tlsConfig),
+		sender:    smtp.Sender,
+		now:       configured.now,
+	}
 }
 
 const defaultSubject = "RenewCMS | Action required"
@@ -60,28 +85,23 @@ func (m MailRepository) Render(templateName string, data any) (string, string, e
 }
 
 func (m MailRepository) Send(receiverAddress string, templateName string, data any) error {
-	login := m.smtp.Login
-	sender := m.smtp.Sender
-	password := m.smtp.Password
-	smtpHost := m.smtp.Host
-	smtpPort := m.smtp.Port
-
-	d := gomail.NewDialer(smtpHost, smtpPort, login, password)
-
 	subject, body, err := m.Render(templateName, data)
 	if err != nil {
 		return err
 	}
 
-	msg := gomail.NewMessage()
-	msg.SetHeaders(map[string][]string{
-		"From":    {"RenewCMS <" + sender + ">"},
-		"To":      {receiverAddress},
-		"Subject": {subject},
-	})
-	msg.SetBody("text/html", body)
+	msg, err := newMessage(m.sender, receiverAddress, subject, body, m.now())
+	if err != nil {
+		log.Println("error when building email:", err)
+		return err
+	}
+	payload, err := msg.bytes()
+	if err != nil {
+		log.Println("error when encoding email:", err)
+		return err
+	}
 
-	if err := d.DialAndSend(msg); err != nil {
+	if err := m.transport.deliver(msg.from.Address, msg.to.Address, payload); err != nil {
 		log.Println("error when sending email:", err)
 		return err
 	}