feat: add simple permissions related handlers

src/authentication/SimpleCredentialsExtractor.ts

@@ -0,0 +1,16 @@
+import { Credentials } from './Credentials';
+import { CredentialsExtractor } from './CredentialsExtractor';
+import { HttpRequest } from '../server/HttpRequest';
+
+export class SimpleCredentialsExtractor extends CredentialsExtractor {
+  public async canHandle(): Promise<void> {
+    return undefined;
+  }
+
+  public async handle(input: HttpRequest): Promise<Credentials> {
+    if (input.headers.authorization) {
+      return { webID: input.headers.authorization };
+    }
+    return undefined;
+  }
+}