feat: invite management API: DELETE /v1/user/invite/:id (204, cancels a pending invite) and POST /v1/user/invite/:id/renew (200, new code, expires_at = now+3d, created_at = now, resends the invitation email, old link dead)

internal/infrastructure/useCases/inviteMail.go

@@ -0,0 +1,59 @@
+package useCases
+
+import (
+	"RenewCMS/internal/domain/hash"
+	"RenewCMS/internal/domain/invite"
+	"RenewCMS/internal/domain/mail"
+	"RenewCMS/internal/domain/user"
+	"fmt"
+	"strings"
+
+	"github.com/google/uuid"
+)
+
+const inviteTemplateName = "invitation"
+
+type MailInviteData struct {
+	Host             string
+	VerificationCode string
+	Email            string
+	InvitedBy        string
+}
+
+func (d MailInviteData) Subject() string {
+	inviter := strings.NewReplacer("\r", " ", "\n", " ").Replace(d.InvitedBy)
+	return inviter + " invited you to RenewCMS"
+}
+
+type inviteMailer struct {
+	mailRepository mail.Repository
+	publicURL      string
+}
+
+func (m inviteMailer) send(email string, rawCode string, inviter user.User) error {
+	if err := m.mailRepository.Send(email, inviteTemplateName, MailInviteData{
+		Host:             m.publicURL,
+		VerificationCode: rawCode,
+		Email:            email,
+		InvitedBy:        inviterName(inviter),
+	}); err != nil {
+		return fmt.Errorf("%w: %w", invite.ErrInviteEmailNotSent, err)
+	}
+	return nil
+}
+
+func newInviteCode(hasher hash.Hasher) (string, string, error) {
+	rawCode := uuid.NewString()
+	hashedCode, err := hasher.Hash(rawCode)
+	if err != nil {
+		return "", "", err
+	}
+	return rawCode, hashedCode, nil
+}
+
+func inviterName(inviter user.User) string {
+	if inviter.DisplayName != "" {
+		return inviter.DisplayName
+	}
+	return inviter.Username
+}