refactor: Separate middleware from Express.

test/integration/Middleware.test.ts

@@ -0,0 +1,69 @@
+import type { Server } from 'http';
+import request from 'supertest';
+import type { ExpressHttpServerFactory } from '../../src/server/ExpressHttpServerFactory';
+import { HttpHandler } from '../../src/server/HttpHandler';
+import type { HttpRequest } from '../../src/server/HttpRequest';
+import type { HttpResponse } from '../../src/server/HttpResponse';
+import { instantiateFromConfig } from '../configs/Util';
+
+const port = 6002;
+
+class SimpleHttpHandler extends HttpHandler {
+  public async handle(input: { request: HttpRequest; response: HttpResponse }): Promise<void> {
+    input.response.writeHead(200);
+    input.response.end('Hello World');
+  }
+}
+
+describe('An Express server with middleware', (): void => {
+  let server: Server;
+
+  beforeAll(async(): Promise<void> => {
+    const factory = await instantiateFromConfig(
+      'urn:solid-server:default:ExpressHttpServerFactory', 'middleware.json', {
+        'urn:solid-server:default:LdpHandler': new SimpleHttpHandler(),
+      },
+    ) as ExpressHttpServerFactory;
+    server = factory.startServer(port);
+  });
+
+  afterEach(async(): Promise<void> => {
+    server.close();
+  });
+
+  it('sends server identification in the X-Powered-By header.', async(): Promise<void> => {
+    const res = await request(server).get('/');
+    expect(res.header).toEqual(expect.objectContaining({
+      'x-powered-by': 'Community Solid Server',
+    }));
+  });
+
+  it('returns CORS headers for an OPTIONS request.', async(): Promise<void> => {
+    const res = await request(server)
+      .options('/')
+      .set('Access-Control-Request-Headers', 'content-type')
+      .set('Access-Control-Request-Method', 'POST')
+      .set('Host', 'test.com')
+      .expect(204);
+    expect(res.header).toEqual(expect.objectContaining({
+      'access-control-allow-origin': '*',
+      'access-control-allow-headers': 'content-type',
+    }));
+    const corsMethods = res.header['access-control-allow-methods'].split(',')
+      .map((method: string): string => method.trim());
+    const allowedMethods = [ 'GET', 'HEAD', 'OPTIONS', 'POST', 'PUT', 'PATCH', 'DELETE' ];
+    expect(corsMethods).toEqual(expect.arrayContaining(allowedMethods));
+    expect(corsMethods).toHaveLength(allowedMethods.length);
+  });
+
+  it('specifies CORS origin header if an origin was supplied.', async(): Promise<void> => {
+    const res = await request(server).get('/').set('origin', 'test.com').expect(200);
+    expect(res.header).toEqual(expect.objectContaining({ 'access-control-allow-origin': 'test.com' }));
+  });
+
+  it('sends incoming requests to the handler.', async(): Promise<void> => {
+    const response = request(server).get('/').set('Host', 'test.com');
+    expect(response).toBeDefined();
+    await response.expect(200).expect('Hello World');
+  });
+});