refac: reamaining auth surface rewrite, T0

internal/infrastructure/useCases/CancelRegistration.go

@@ -0,0 +1,26 @@
+package useCases
+
+import (
+	"RenewCMS/internal/domain/user"
+)
+
+type CancelRegistrationUseCase struct {
+	userRepository user.Repository
+}
+
+func NewCancelRegistrationUseCase(userRepository user.Repository) *CancelRegistrationUseCase {
+	return &CancelRegistrationUseCase{userRepository}
+}
+
+func (c *CancelRegistrationUseCase) CancelRegistration(userId uint32) error {
+	dbUser, err := c.userRepository.Get(userId)
+	if err != nil {
+		return err
+	}
+
+	if dbUser.IsVerified {
+		return user.ErrAlreadyVerified
+	}
+
+	return c.userRepository.Delete(userId)
+}