feat(ls): add validation for empty responses object

packages/apidom-ls/src/config/codes.ts

@@ -868,6 +868,9 @@ enum ApilintCodes {
   OPENAPI2_REFERENCE_FIELD_$REF_FORMAT_URI = 3240100,
   OPENAPI2_REFERENCE_NOT_USED = 3240300,
 
+  OPENAPI2_RESPONSES = 3250000,
+  OPENAPI2_RESPONSES_REQUIRED_FIELDS,
+
   OPENAPI3_0 = 5000000,
 
   OPENAPI3_0_OPENAPI_VALUE_PATTERN_3_0_0 = 5000100,

packages/apidom-ls/src/config/openapi/responses/lint/index.ts

@@ -1,7 +1,8 @@
 import allowedFields2_0Lint from './allowed-fields-2-0.ts';
 import allowedFields3_0__3_1Lint from './allowed-fields-3-0--3-1.ts';
 import valuesTypeLint from './values--type.ts';
+import requiredFieldsLint from './required-fields.ts';
 
-const lints = [valuesTypeLint, allowedFields2_0Lint, allowedFields3_0__3_1Lint];
+const lints = [valuesTypeLint, allowedFields2_0Lint, allowedFields3_0__3_1Lint, requiredFieldsLint];
 
 export default lints;

packages/apidom-ls/src/config/openapi/responses/lint/required-fields.ts

@@ -0,0 +1,17 @@
+import { DiagnosticSeverity } from 'vscode-languageserver-types';
+
+import ApilintCodes from '../../../codes.ts';
+import { LinterMeta } from '../../../../apidom-language-types.ts';
+import { OpenAPI2, OpenAPI3 } from '../../target-specs.ts';
+
+const requiredFieldsLint: LinterMeta = {
+  code: ApilintCodes.OPENAPI2_RESPONSES_REQUIRED_FIELDS,
+  source: 'apilint',
+  message: 'Responses Object should define at least one response',
+  severity: DiagnosticSeverity.Error,
+  linterFunction: 'apilintOpenAPIEmptyResponses',
+  marker: 'key',
+  targetSpecs: [...OpenAPI2, ...OpenAPI3],
+};
+
+export default requiredFieldsLint;

packages/apidom-ls/src/services/validation/linter-functions.ts

@@ -1479,4 +1479,17 @@ export const standardLinterfunctions: FunctionItem[] = [
         : true;
     },
   },
+  {
+    functionName: 'apilintOpenAPIEmptyResponses',
+    function: (element: Element): boolean => {
+      if (element && isObject(element)) {
+        if (!element.keys() || element.keys().length === 0) {
+          return false;
+        }
+
+        return element.keys().some((k) => typeof k !== 'string' || !k.startsWith('x-'));
+      }
+      return true;
+    },
+  },
 ];

packages/apidom-ls/test/fixtures/validation/oas/parameter-unique-name-2-0.yaml

@@ -6,6 +6,8 @@ paths:
   /pets:
     get:
       responses:
+        '200':
+          description: ok
       parameters:
         - name: pathLevel
           type: string

packages/apidom-ls/test/fixtures/validation/oas/parameter-unique-name-3-0.yaml

@@ -6,6 +6,8 @@ paths:
   /pets:
     get:
       responses:
+        '200':
+          description: ok
       parameters:
         - name: pathLevel
           in: query

packages/apidom-ls/test/fixtures/validation/oas/responses-required-fields-2-0.yaml

@@ -0,0 +1,8 @@
+swagger: '2.0'
+info:
+  title: Test
+  version: 1.0.0
+paths:
+  /:
+    get:
+      responses:

packages/apidom-ls/test/fixtures/validation/oas/responses-required-fields-3-0.yaml

@@ -0,0 +1,8 @@
+openapi: 3.0.0
+info:
+  title: Test
+  version: 1.0.0
+paths:
+  /:
+    get:
+      responses:

packages/apidom-ls/test/validate.ts

@@ -4205,11 +4205,11 @@ describe('apidom-ls-validate', function () {
         range: {
           end: {
             character: 14,
-            line: 9,
+            line: 11,
           },
           start: {
             character: 10,
-            line: 9,
+            line: 11,
           },
         },
         severity: 1,
@@ -4222,11 +4222,11 @@ describe('apidom-ls-validate', function () {
         range: {
           end: {
             character: 14,
-            line: 14,
+            line: 16,
           },
           start: {
             character: 10,
-            line: 14,
+            line: 16,
           },
         },
         severity: 1,
@@ -4268,11 +4268,11 @@ describe('apidom-ls-validate', function () {
         range: {
           end: {
             character: 14,
-            line: 9,
+            line: 11,
           },
           start: {
             character: 10,
-            line: 9,
+            line: 11,
           },
         },
         severity: 1,
@@ -4285,11 +4285,11 @@ describe('apidom-ls-validate', function () {
         range: {
           end: {
             character: 14,
-            line: 15,
+            line: 17,
           },
           start: {
             character: 10,
-            line: 15,
+            line: 17,
           },
         },
         severity: 1,
@@ -6099,4 +6099,64 @@ describe('apidom-ls-validate', function () {
 
     languageService.terminate();
   });
+
+  it('oas 2.0 - Responses Object should define at least one response', async function () {
+    const spec = fs
+      .readFileSync(
+        path.join(__dirname, 'fixtures', 'validation', 'oas', 'responses-required-fields-2-0.yaml'),
+      )
+      .toString();
+    const doc: TextDocument = TextDocument.create(
+      'foo://bar/responses-required-fields-2-0.yaml',
+      'yaml',
+      0,
+      spec,
+    );
+
+    const languageService: LanguageService = getLanguageService(contextNoSchema);
+
+    const result = await languageService.doValidation(doc);
+    const expected: Diagnostic[] = [
+      {
+        message: 'Responses Object should define at least one response',
+        severity: 1,
+        code: 3250001,
+        source: 'apilint',
+        range: { start: { line: 7, character: 6 }, end: { line: 7, character: 15 } },
+      },
+    ];
+    assert.deepEqual(result, expected);
+
+    languageService.terminate();
+  });
+
+  it('oas 3.x - Responses Object should define at least one response', async function () {
+    const spec = fs
+      .readFileSync(
+        path.join(__dirname, 'fixtures', 'validation', 'oas', 'responses-required-fields-3-0.yaml'),
+      )
+      .toString();
+    const doc: TextDocument = TextDocument.create(
+      'foo://bar/responses-required-fields-3-0.yaml',
+      'yaml',
+      0,
+      spec,
+    );
+
+    const languageService: LanguageService = getLanguageService(contextNoSchema);
+
+    const result = await languageService.doValidation(doc);
+    const expected: Diagnostic[] = [
+      {
+        message: 'Responses Object should define at least one response',
+        severity: 1,
+        code: 3250001,
+        source: 'apilint',
+        range: { start: { line: 7, character: 6 }, end: { line: 7, character: 15 } },
+      },
+    ];
+    assert.deepEqual(result, expected);
+
+    languageService.terminate();
+  });
 });