Add openapi-normalizer rule to set tags to operationId

modules/openapi-generator/src/main/java/org/openapitools/codegen/OpenAPINormalizer.java

@@ -80,6 +80,11 @@ public class OpenAPINormalizer {
     final String SET_TAGS_FOR_ALL_OPERATIONS = "SET_TAGS_FOR_ALL_OPERATIONS";
     String setTagsForAllOperations;
 
+    // when set to true, tags in all operations will be set to operationId or "default" if operationId
+    // is empty
+    final String SET_TAGS_TO_OPERATIONID = "SET_TAGS_TO_OPERATIONID";
+    String setTagsToOperationId;
+
     // when set to true, auto fix integer with maximum value 4294967295 (2^32-1) or long with 18446744073709551615 (2^64-1)
     // by adding x-unsigned to the schema
     final String ADD_UNSIGNED_TO_INTEGER_WITH_INVALID_MAX_VALUE = "ADD_UNSIGNED_TO_INTEGER_WITH_INVALID_MAX_VALUE";
@@ -117,6 +122,7 @@ public OpenAPINormalizer(OpenAPI openAPI, Map<String, String> inputRules) {
         ruleNames.add(SIMPLIFY_BOOLEAN_ENUM);
         ruleNames.add(KEEP_ONLY_FIRST_TAG_IN_OPERATION);
         ruleNames.add(SET_TAGS_FOR_ALL_OPERATIONS);
+        ruleNames.add(SET_TAGS_TO_OPERATIONID);
         ruleNames.add(ADD_UNSIGNED_TO_INTEGER_WITH_INVALID_MAX_VALUE);
         ruleNames.add(REFACTOR_ALLOF_WITH_PROPERTIES_ONLY);
         ruleNames.add(NORMALIZE_31SPEC);
@@ -233,6 +239,8 @@ private void normalizeOperation(Operation operation) {
         processKeepOnlyFirstTagInOperation(operation);
 
         processSetTagsForAllOperations(operation);
+
+        processSetTagsToOperationId(operation);
     }
 
     /**
@@ -619,6 +627,24 @@ private void processSetTagsForAllOperations(Operation operation) {
         operation.addTagsItem(setTagsForAllOperations);
     }
 
+    /**
+     * Set the tag name to operationId (or "default" if operationId is empty)
+     *
+     * @param operation Operation
+     */
+    private void processSetTagsToOperationId(Operation operation) {
+        if (!getRule(SET_TAGS_TO_OPERATIONID)) {
+            return;
+        }
+
+        operation.setTags(null);
+        if (StringUtils.isNotEmpty(operation.getOperationId())) {
+            operation.addTagsItem(operation.getOperationId());
+        } else { // default to "default" if operationId is empty
+            operation.addTagsItem("default");
+        }
+    }
+
     /**
      * If the schema contains anyOf/oneOf and properties, remove oneOf/anyOf as these serve as rules to
      * ensure inter-dependency between properties. It's a workaround as such validation is not supported at the moment.

modules/openapi-generator/src/test/java/org/openapitools/codegen/OpenAPINormalizerTest.java

@@ -242,6 +242,24 @@ public void testOpenAPINormalizerSetTagsInAllOperations() {
         assertEquals(openAPI.getPaths().get("/person/display/{personId}").getDelete().getTags().get(0), "core");
     }
 
+    @Test
+    public void testOpenAPINormalizerSetTagsToOperationId() {
+        OpenAPI openAPI = TestUtils.parseSpec("src/test/resources/3_0/enableKeepOnlyFirstTagInOperation_test.yaml");
+
+        assertEquals(openAPI.getPaths().get("/person/display/{personId}").getGet().getTags().size(), 2);
+        assertEquals(openAPI.getPaths().get("/person/display/{personId}").getDelete().getTags().size(), 1);
+
+        Map<String, String> options = new HashMap<>();
+        options.put("SET_TAGS_TO_OPERATIONID", "true");
+        OpenAPINormalizer openAPINormalizer = new OpenAPINormalizer(openAPI, options);
+        openAPINormalizer.normalize();
+
+        assertEquals(openAPI.getPaths().get("/person/display/{personId}").getGet().getTags().size(), 1);
+        assertEquals(openAPI.getPaths().get("/person/display/{personId}").getDelete().getTags().size(), 1);
+        assertEquals(openAPI.getPaths().get("/person/display/{personId}").getGet().getTags().get(0), "list");
+        assertEquals(openAPI.getPaths().get("/person/display/{personId}").getDelete().getTags().get(0), "delete");
+    }
+
     @Test
     public void testAddUnsignedToIntegerWithInvalidMaxValue() {
         OpenAPI openAPI = TestUtils.parseSpec("src/test/resources/3_0/addUnsignedToIntegerWithInvalidMaxValue_test.yaml");