feat: change email, export my data, delete account (with data anonymization)

internal/infrastructure/useCases/emailChangeMail.go

@@ -0,0 +1,81 @@
+package useCases
+
+import (
+	"RenewCMS/internal/domain/hash"
+	"RenewCMS/internal/domain/mail"
+	"RenewCMS/internal/domain/user"
+	"log"
+	"time"
+
+	"github.com/google/uuid"
+)
+
+const (
+	verifyNewEmailTemplateName    = "verify-new-email"
+	emailChangeNoticeTemplateName = "email-change-notice"
+)
+
+type MailVerifyNewEmailData struct {
+	Host             string
+	Username         string
+	VerificationCode string
+}
+
+type MailEmailChangeNoticeData struct {
+	Host     string
+	Username string
+	NewEmail string
+}
+
+type emailChangeIssuer struct {
+	userRepository user.Repository
+	hasher         hash.Hasher
+	mailRepository mail.Repository
+	dispatcher     mail.Dispatcher
+	publicURL      string
+	now            func() time.Time
+}
+
+func (i emailChangeIssuer) issue(account user.User, pendingEmail string) (user.User, error) {
+	rawCode := uuid.NewString()
+	hashedCode, err := i.hasher.Hash(rawCode)
+	if err != nil {
+		return user.User{}, err
+	}
+	updated, err := i.userRepository.SetPendingEmailChange(account.ID, pendingEmail, hashedCode, i.now().Add(user.EmailChangeLifetime))
+	if err != nil {
+		return user.User{}, err
+	}
+	i.dispatcher.Dispatch(func() { i.sendVerification(account, pendingEmail, rawCode) })
+	return updated, nil
+}
+
+func (i emailChangeIssuer) sendVerification(account user.User, pendingEmail string, rawCode string) {
+	taken, err := i.userRepository.IsEmailInUse(pendingEmail, account.ID)
+	if err != nil {
+		log.Println("error when checking whether the new email address is in use:", err)
+		return
+	}
+	if taken {
+		return
+	}
+	if err := i.mailRepository.Send(pendingEmail, verifyNewEmailTemplateName, MailVerifyNewEmailData{
+		Host:             i.publicURL,
+		Username:         account.Username,
+		VerificationCode: rawCode,
+	}); err != nil {
+		log.Println("error when Send-ing the new email verification mail:", err)
+	}
+}
+
+func (i emailChangeIssuer) sendNotice(account user.User, pendingEmail string) {
+	i.dispatcher.Dispatch(func() {
+		if err := i.mailRepository.Send(account.Email, emailChangeNoticeTemplateName, MailEmailChangeNoticeData{
+			Host:     i.publicURL,
+			Username: account.Username,
+			NewEmail: pendingEmail,
+		}); err != nil {
+			log.Println("error when Send-ing the email change notice mail:", err)
+		}
+	})
+}