feat: add simple permissions related handlers

test/unit/authentication/SimpleCredentialsExtractor.test.ts

@@ -0,0 +1,19 @@
+import { HttpRequest } from '../../../src/server/HttpRequest';
+import { SimpleCredentialsExtractor } from '../../../src/authentication/SimpleCredentialsExtractor';
+
+describe('A SimpleCredentialsExtractor', (): void => {
+  const extractor = new SimpleCredentialsExtractor();
+
+  it('can handle all input.', async(): Promise<void> => {
+    await expect(extractor.canHandle()).resolves.toBeUndefined();
+  });
+
+  it('returns undefined if there is no input.', async(): Promise<void> => {
+    await expect(extractor.handle({ headers: {}} as HttpRequest)).resolves.toBeUndefined();
+  });
+
+  it('returns the authorization header as webID if there is one.', async(): Promise<void> => {
+    await expect(extractor.handle({ headers: { authorization: 'test' }} as HttpRequest))
+      .resolves.toEqual({ webID: 'test' });
+  });
+});