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

internal/domain/user/userErasure.go

@@ -0,0 +1,42 @@
+package user
+
+import "errors"
+
+const DeletedUserName = "Deleted user"
+
+const (
+	LastRoleOwner = "Owner"
+	LastRoleAdmin = "Admin"
+)
+
+var ErrLastOwner = errors.New("last owner")
+var ErrLastAdmin = errors.New("last administrator")
+var ErrAccountNotDeletable = errors.New("account not deletable")
+
+type LastAdminError struct {
+	Role string
+}
+
+func (e LastAdminError) Error() string {
+	if e.Role == LastRoleOwner {
+		return ErrLastOwner.Error()
+	}
+	return ErrLastAdmin.Error()
+}
+
+func (e LastAdminError) Is(target error) bool {
+	if target == ErrLastAdmin {
+		return true
+	}
+	return target == ErrLastOwner && e.Role == LastRoleOwner
+}
+
+type Erasure struct {
+	UserID        uint32
+	GuardRoleIDs  []uint32
+	AvatarImageID *uint32
+}
+
+type Eraser interface {
+	Erase(erasure Erasure) error
+}