feat: add simple target extractor

src/ldp/http/SimpleTargetExtractor.ts

@@ -0,0 +1,15 @@
+import { HttpRequest } from '../../server/HttpRequest';
+import { ResourceIdentifier } from '../representation/ResourceIdentifier';
+import { TargetExtractor } from './TargetExtractor';
+
+export class SimpleTargetExtractor extends TargetExtractor {
+  public async canHandle(input: HttpRequest): Promise<void> {
+    if (!input.url) {
+      throw new Error('Missing URL.');
+    }
+  }
+
+  public async handle(input: HttpRequest): Promise<ResourceIdentifier> {
+    return { path: input.url };
+  }
+}

test/unit/ldp/http/SimpleTargetExtractor.test.ts

@@ -0,0 +1,17 @@
+import { SimpleTargetExtractor } from '../../../../src/ldp/http/SimpleTargetExtractor';
+
+describe('A SimpleTargetExtractor', (): void => {
+  const extractor = new SimpleTargetExtractor();
+
+  it('can handle input with an URL.', async(): Promise<void> => {
+    await expect(extractor.canHandle({ url: 'url' } as any)).resolves.toBeUndefined();
+  });
+
+  it('rejects input without URL.', async(): Promise<void> => {
+    await expect(extractor.canHandle({ } as any)).rejects.toThrow('Missing URL.');
+  });
+
+  it('returns the input URL.', async(): Promise<void> => {
+    await expect(extractor.handle({ url: 'url' } as any)).resolves.toEqual({ path: 'url' });
+  });
+});