feat: Add required ACP headers

test/unit/server/middleware/AcpHeaderHandler.test.ts

@@ -0,0 +1,47 @@
+import { ACP } from '@solid/access-control-policy/dist/constant/acp';
+import { createResponse } from 'node-mocks-http';
+import type { AuxiliaryIdentifierStrategy } from '../../../../src/http/auxiliary/AuxiliaryIdentifierStrategy';
+import type { TargetExtractor } from '../../../../src/http/input/identifier/TargetExtractor';
+import type { HttpRequest } from '../../../../src/server/HttpRequest';
+import type { HttpResponse } from '../../../../src/server/HttpResponse';
+import { AcpHeaderHandler } from '../../../../src/server/middleware/AcpHeaderHandler';
+import { ACL } from '../../../../src/util/Vocabularies';
+import { SimpleSuffixStrategy } from '../../../util/SimpleSuffixStrategy';
+
+describe('an AcpHeaderHandler', (): void => {
+  const request: HttpRequest = {} as any;
+  let response: HttpResponse;
+  const modes = [ ACL.Read, ACL.Write ];
+  const attributes = [ ACP.agent, ACP.client ];
+  let targetExtractor: jest.Mocked<TargetExtractor>;
+  let strategy: AuxiliaryIdentifierStrategy;
+  let handler: AcpHeaderHandler;
+
+  beforeEach(async(): Promise<void> => {
+    response = createResponse() as HttpResponse;
+    targetExtractor = {
+      handleSafe: jest.fn().mockResolvedValue({ path: 'http://example.org/foo/bar' }),
+    } as any;
+
+    strategy = new SimpleSuffixStrategy('.acr');
+
+    handler = new AcpHeaderHandler(targetExtractor, strategy, modes, attributes);
+  });
+
+  it('adds no headers if the target is not an ACR.', async(): Promise<void> => {
+    await expect(handler.handle({ request, response })).resolves.toBeUndefined();
+    expect(response.getHeaders()).toEqual({});
+  });
+
+  it('adds all the required headers.', async(): Promise<void> => {
+    targetExtractor.handleSafe.mockResolvedValueOnce({ path: 'http://example.org/foo/bar.acr' });
+    await expect(handler.handle({ request, response })).resolves.toBeUndefined();
+    expect(response.getHeaders()).toEqual({ link: [
+      '<http://www.w3.org/ns/solid/acp#AccessControlResource>; rel="type"',
+      '<http://www.w3.org/ns/auth/acl#Read>; rel="http://www.w3.org/ns/solid/acp#grant"',
+      '<http://www.w3.org/ns/auth/acl#Write>; rel="http://www.w3.org/ns/solid/acp#grant"',
+      '<http://www.w3.org/ns/solid/acp#agent>; rel="http://www.w3.org/ns/solid/acp#attribute"',
+      '<http://www.w3.org/ns/solid/acp#client>; rel="http://www.w3.org/ns/solid/acp#attribute"',
+    ]});
+  });
+});