check confilcts

Author: rushmash91

pkg/sdk/helper.go

@@ -17,6 +17,7 @@ import (
 	"errors"
 	"fmt"
 	"path/filepath"
+	"strings"
 
 	"github.com/go-git/go-git/v5"
 
@@ -111,7 +112,7 @@ func (h *Helper) API(serviceModelName string) (*model.SDKAPI, error) {
 		sdkapi := model.NewSDKAPI(api, h.APIGroupSuffix)
 
 		h.InjectCustomShapes(sdkapi)
-		
+
 		return sdkapi, nil
 	}
 	return nil, ErrServiceNotFound
@@ -129,3 +130,25 @@ func (h *Helper) ModelAndDocsPath(serviceModelName string) string {
 	)
 	return modelPath
 }
+
+// GetOriginalAPIShapeSet returns a map set (keys with empty struct values) of all original shape names
+// from the AWS service API model. This provides efficient lookups to check if a shape name exists.
+func (h *Helper) GetOriginalAPIShapeSet(serviceNameOrID string) (map[string]struct{}, error) {
+	modelPath := h.ModelAndDocsPath(serviceNameOrID)
+	apis, err := apiv2.LoadAPI(modelPath)
+	if err != nil {
+		return nil, err
+	}
+
+	for _, api := range apis {
+		_ = api.ServicePackageDoc()
+		shapeSet := make(map[string]struct{}, len(api.Shapes))
+		for shapeName := range api.Shapes {
+			shapeSet[shapeName] = struct{}{}
+			shapeSet[strings.ToLower(shapeName)] = struct{}{}
+		}
+		return shapeSet, nil
+	}
+
+	return nil, ErrServiceNotFound
+}

pkg/sdk/simpleschema.go

@@ -30,6 +30,17 @@ func (h *Helper) InjectSimpleSchemaShapes(sdkapi *ackmodel.SDKAPI) error {
 		return nil
 	}
 
+	// Get a set of all original shape names for more efficient lookups
+	originalShapeSet, err := h.GetOriginalAPIShapeSet(sdkapi.ServiceID())
+	if err != nil {
+		return err
+	}
+	for shapeName := range h.cfg.CustomShapes {
+		if _, exists := originalShapeSet[shapeName]; exists {
+			panic(fmt.Sprintf("custom shape %s conflicts with existing API shape", shapeName))
+		}
+	}
+
 	for shapeName, fieldsMap := range h.cfg.CustomShapes {
 		schemaObj := convertMapKeys(fieldsMap)