refac: remove frontend & clearer DDD

internal/infrastructure/mailer/mailRepository.go

@@ -0,0 +1,64 @@
+package mailer
+
+import (
+	domain "RenewCMS/internal/domain/mail"
+	"bytes"
+	"embed"
+	"html/template"
+	"log"
+	"os"
+	"strconv"
+
+	"gopkg.in/gomail.v2"
+)
+
+type MailRepository struct{}
+
+//go:embed templates/*
+var mailTemplateFiles embed.FS
+
+func NewMailRepository() *MailRepository {
+	return &MailRepository{}
+}
+
+func (m MailRepository) Send(receiverAddress string, templateName string, data any) error {
+	from := os.Getenv("SMTP_EMAIL")
+	password := os.Getenv("SMTP_PASSWORD")
+	smtpHost := os.Getenv("SMTP_HOST")
+	smtpPort, _ := strconv.Atoi(os.Getenv("SMTP_PORT"))
+
+	d := gomail.NewDialer(smtpHost, smtpPort, from, password)
+
+	tmpl, err := template.ParseFS(mailTemplateFiles, "mail/templates/"+templateName+".html")
+	if err != nil {
+		log.Println("error when template.ParseFS:", err)
+		return err
+	}
+
+	var body bytes.Buffer
+	err = tmpl.Execute(&body, data)
+	if err != nil {
+		log.Println("error when tmpl.Execute:", err)
+		return err
+	}
+
+	msg := gomail.NewMessage()
+	msg.SetHeaders(map[string][]string{
+		"From":         {"RenewCMS <" + from + ">"},
+		"To":           {receiverAddress},
+		"MIME-version": {"1.0"},
+		"Content-Type": {"text/html"},
+		"charset":      {"UTF-8"},
+		"Subject":      {"RenewCMS | Action required"},
+	})
+	msg.SetBody("text/html", body.String())
+
+	if err := d.DialAndSend(msg); err != nil {
+		log.Println("error when sending email:", err)
+		return err
+	}
+
+	return nil
+}
+
+var _ domain.Repository = &MailRepository{}