Revert "fix: check update payload diff"

This reverts commit 2dab9f5.

api/handler/v1beta1/grant.go

@@ -133,8 +133,7 @@ func (s *GRPCServer) UpdateGrant(ctx context.Context, req *guardianv1beta1.Updat
 		case errors.Is(err, grant.ErrGrantNotFound):
 			return nil, status.Error(codes.NotFound, err.Error())
 		case errors.Is(err, grant.ErrEmptyOwner),
-			errors.Is(err, domain.ErrInvalidGrantUpdateRequest),
-			errors.Is(err, domain.ErrGrantUpdateNoChanges):
+			errors.Is(err, domain.ErrInvalidGrantUpdateRequest):
 			return nil, status.Error(codes.InvalidArgument, err.Error())
 		default:
 			return nil, s.internalError(ctx, "failed to update grant: %v", err)

domain/grant.go

@@ -28,7 +28,6 @@ var (
 	ErrDuplicateActiveGrant      = errors.New("grant already exists")
 	ErrInvalidGrantRestoreParams = errors.New("invalid grant restore parameters")
 	ErrInvalidGrantUpdateRequest = errors.New("invalid grant update request")
-	ErrGrantUpdateNoChanges      = errors.New("no changes in grant update request")
 )
 
 type Grant struct {
@@ -175,15 +174,9 @@ func (gu *GrantUpdate) Validate(current Grant) error {
 		return fmt.Errorf("can't update grant in status %q", current.Status)
 	}
 
-	anyFieldUpdated := false
-
 	// owner
-	if gu.Owner != nil {
-		if *gu.Owner == "" {
-			return errors.New("owner should not be empty")
-		} else if *gu.Owner != current.Owner {
-			anyFieldUpdated = true
-		}
+	if gu.Owner != nil && *gu.Owner == "" {
+		return errors.New("owner should not be empty")
 	}
 
 	// expiration date
@@ -200,14 +193,6 @@ func (gu *GrantUpdate) Validate(current Grant) error {
 		if gu.ExpirationDateReason == nil || *gu.ExpirationDateReason == "" {
 			return errors.New("expiration date reason is required")
 		}
-
-		if current.ExpirationDate == nil || (gu.ExpirationDate.Compare(*current.ExpirationDate) != 0) {
-			anyFieldUpdated = true
-		}
-	}
-
-	if !anyFieldUpdated {
-		return ErrGrantUpdateNoChanges
 	}
 
 	return nil