feat(ns-openapi-2): add support for License Object

packages/apidom-ns-openapi-2/README.md

@@ -187,7 +187,7 @@ Only fully implemented specification objects should be checked here.
 - [ ] [Swagger Object](https://github.com/OAI/OpenAPI-Specification/blob/main/versions/2.0.md#user-content-swagger-object)
 - [ ] [Info Object](https://github.com/OAI/OpenAPI-Specification/blob/main/versions/2.0.md#user-content-info-object)
 - [x] [Contact Object](https://github.com/OAI/OpenAPI-Specification/blob/main/versions/2.0.md#user-content-contact-object)
-- [ ] [License Object](https://github.com/OAI/OpenAPI-Specification/blob/main/versions/2.0.md#user-content-license-object)
+- [x] [License Object](https://github.com/OAI/OpenAPI-Specification/blob/main/versions/2.0.md#user-content-license-object)
 - [ ] [Paths Object](https://github.com/OAI/OpenAPI-Specification/blob/main/versions/2.0.md#user-content-paths-object)
 - [ ] [Path Item Object](https://github.com/OAI/OpenAPI-Specification/blob/main/versions/2.0.md#user-content-path-item-object)
 - [ ] [Operation Object](https://github.com/OAI/OpenAPI-Specification/blob/main/versions/2.0.md#user-content-operation-object)

packages/apidom-ns-openapi-2/src/elements/License.ts

@@ -0,0 +1,26 @@
+import { StringElement, ObjectElement, Attributes, Meta } from '@swagger-api/apidom-core';
+
+class License extends ObjectElement {
+  constructor(content?: Record<string, unknown>, meta?: Meta, attributes?: Attributes) {
+    super(content, meta, attributes);
+    this.element = 'license';
+  }
+
+  get name(): StringElement | undefined {
+    return this.get('name');
+  }
+
+  set name(name: StringElement | undefined) {
+    this.set('name', name);
+  }
+
+  get url(): StringElement | undefined {
+    return this.get('url');
+  }
+
+  set url(url: StringElement | undefined) {
+    this.set('url', url);
+  }
+}
+
+export default License;

packages/apidom-ns-openapi-2/src/index.ts

@@ -20,6 +20,7 @@ export { default as refract, createRefractor } from './refractor';
 export { default as specificationObj } from './refractor/specification';
 
 export {
+  isLicenseElement,
   isContactElement,
   isExternalDocumentationElement,
   isXmlElement,
@@ -33,6 +34,7 @@ export { keyMap, getNodeType } from './traversal/visitor';
 
 // OpenAPI 2.0 elements
 export {
+  LicenseElement,
   ContactElement,
   ExternalDocumentationElement,
   XmlElement,

packages/apidom-ns-openapi-2/src/namespace.ts

@@ -1,5 +1,6 @@
 import { NamespacePluginOptions } from '@swagger-api/apidom-core';
 
+import LicenseElement from './elements/License';
 import ContactElement from './elements/Contact';
 import ExternalDocumentation from './elements/ExternalDocumentation';
 import XmlElement from './elements/Xml';
@@ -12,6 +13,7 @@ const openApi2 = {
   namespace: (options: NamespacePluginOptions) => {
     const { base } = options;
 
+    base.register('license', LicenseElement);
     base.register('contact', ContactElement);
     base.register('externalDocumentation', ExternalDocumentation);
     base.register('xml', XmlElement);

packages/apidom-ns-openapi-2/src/predicates.ts

@@ -1,5 +1,6 @@
 import { createPredicate } from '@swagger-api/apidom-core';
 
+import LicenseElement from './elements/License';
 import ContactElement from './elements/Contact';
 import ExternalDocumentation from './elements/ExternalDocumentation';
 import XmlElement from './elements/Xml';
@@ -8,6 +9,16 @@ import SecuritySchemeElement from './elements/SecurityScheme';
 import SecurityRequirementElement from './elements/SecurityRequirement';
 import ScopesElement from './elements/Scopes';
 
+export const isLicenseElement = createPredicate(
+  ({ hasBasicElementProps, isElementType, primitiveEq }) => {
+    return (element: any) =>
+      element instanceof LicenseElement ||
+      (hasBasicElementProps(element) &&
+        isElementType('license', element) &&
+        primitiveEq('object', element));
+  },
+);
+
 export const isContactElement = createPredicate(
   ({ hasBasicElementProps, isElementType, primitiveEq }) => {
     return (element: any) =>

packages/apidom-ns-openapi-2/src/refractor/registration.ts

@@ -1,3 +1,4 @@
+import LicenseElement from '../elements/License';
 import ContactElement from '../elements/Contact';
 import ExternalDocumentationElement from '../elements/ExternalDocumentation';
 import XmlElement from '../elements/Xml';
@@ -8,6 +9,13 @@ import SecurityRequirementElement from '../elements/SecurityRequirement';
 import { createRefractor } from './index';
 
 // register refractors specific to element types
+LicenseElement.refract = createRefractor([
+  'visitors',
+  'document',
+  'objects',
+  'License',
+  '$visitor',
+]);
 ContactElement.refract = createRefractor([
   'visitors',
   'document',
@@ -47,6 +55,7 @@ SecurityRequirementElement.refract = createRefractor([
 ]);
 
 export {
+  LicenseElement,
   ContactElement,
   ExternalDocumentationElement,
   XmlElement,

packages/apidom-ns-openapi-2/src/refractor/specification.ts

@@ -1,4 +1,5 @@
 import FallbackVisitor from './visitors/FallbackVisitor';
+import LicenseVisitor from './visitors/open-api-2/license';
 import ContactVisitor from './visitors/open-api-2/contact';
 import ExternalDocumentationElement from './visitors/open-api-2/external-documentation';
 import XmlVisitor from './visitors/open-api-2/xml';
@@ -22,6 +23,13 @@ const specification = {
     value: FallbackVisitor,
     document: {
       objects: {
+        License: {
+          $visitor: LicenseVisitor,
+          fixedFields: {
+            name: FallbackVisitor,
+            url: FallbackVisitor,
+          },
+        },
         Contact: {
           $visitor: ContactVisitor,
           fixedFields: {

packages/apidom-ns-openapi-2/src/refractor/visitors/open-api-2/license/index.ts

@@ -0,0 +1,18 @@
+import stampit from 'stampit';
+import { always } from 'ramda';
+
+import LicenseElement from '../../../../elements/License';
+import FallbackVisitor from '../../FallbackVisitor';
+import FixedFieldsVisitor from '../../generics/FixedFieldsVisitor';
+
+const LicenseVisitor = stampit(FixedFieldsVisitor, FallbackVisitor, {
+  props: {
+    specPath: always(['document', 'objects', 'License']),
+    canSupportSpecificationExtensions: true,
+  },
+  init() {
+    this.element = new LicenseElement();
+  },
+});
+
+export default LicenseVisitor;

packages/apidom-ns-openapi-2/src/traversal/visitor.ts

@@ -19,6 +19,7 @@ export const getNodeType = <T extends Element>(element: T): string | undefined =
  */
 
 export const keyMap = {
+  LicenseElement: ['content'],
   ContactElement: ['content'],
   ExternalDocumentationElement: ['content'],
   XmlElement: ['content'],

packages/apidom-ns-openapi-2/test/predicates.ts

@@ -1,13 +1,15 @@
 import { assert } from 'chai';
 
 import {
+  LicenseElement,
   ContactElement,
   ExternalDocumentationElement,
   XmlElement,
   SecurityDefinitionsElement,
   SecuritySchemeElement,
   ScopesElement,
   SecurityRequirementElement,
+  isLicenseElement,
   isContactElement,
   isExternalDocumentationElement,
   isXmlElement,
@@ -18,6 +20,63 @@ import {
 } from '../src';
 
 describe('predicates', function () {
+  context('isLicenseElement', function () {
+    context('given LicenseElement instance value', function () {
+      specify('should return true', function () {
+        const element = new LicenseElement();
+
+        assert.isTrue(isLicenseElement(element));
+      });
+    });
+
+    context('given subtype instance value', function () {
+      specify('should return true', function () {
+        // eslint-disable-next-line @typescript-eslint/naming-convention
+        class LicenseSubElement extends LicenseElement {}
+
+        assert.isTrue(isLicenseElement(new LicenseSubElement()));
+      });
+    });
+
+    context('given non LicenseSubElement instance value', function () {
+      specify('should return false', function () {
+        assert.isFalse(isLicenseElement(1));
+        assert.isFalse(isLicenseElement(null));
+        assert.isFalse(isLicenseElement(undefined));
+        assert.isFalse(isLicenseElement({}));
+        assert.isFalse(isLicenseElement([]));
+        assert.isFalse(isLicenseElement('string'));
+      });
+    });
+
+    specify('should support duck-typing', function () {
+      const licenseElementDuck = {
+        _storedElement: 'license',
+        _content: [],
+        primitive() {
+          return 'object';
+        },
+        get element() {
+          return this._storedElement;
+        },
+      };
+
+      const licenseElementSwan = {
+        _storedElement: undefined,
+        _content: undefined,
+        primitive() {
+          return 'swan';
+        },
+        get length() {
+          return 0;
+        },
+      };
+
+      assert.isTrue(isLicenseElement(licenseElementDuck));
+      assert.isFalse(isLicenseElement(licenseElementSwan));
+    });
+  });
+
   context('isContactElement', function () {
     context('given ContactElement instance value', function () {
       specify('should return true', function () {

packages/apidom-ns-openapi-2/test/refractor/elements/License/__snapshots__/index.ts.snap

@@ -0,0 +1,11 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`refractor elements LicenseElement should refract to semantic ApiDOM tree 1`] = `
+(LicenseElement
+  (MemberElement
+    (StringElement)
+    (StringElement))
+  (MemberElement
+    (StringElement)
+    (StringElement)))
+`;

packages/apidom-ns-openapi-2/test/refractor/elements/License/index.ts

@@ -0,0 +1,19 @@
+import { expect } from 'chai';
+import { sexprs } from '@swagger-api/apidom-core';
+
+import { LicenseElement } from '../../../../src';
+
+describe('refractor', function () {
+  context('elements', function () {
+    context('LicenseElement', function () {
+      specify('should refract to semantic ApiDOM tree', function () {
+        const licenseElement = LicenseElement.refract({
+          name: 'Apache 2.0',
+          url: 'http://www.apache.org/licenses/LICENSE-2.0.html',
+        });
+
+        expect(sexprs(licenseElement)).toMatchSnapshot();
+      });
+    });
+  });
+});