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;
+  }
+}

src/authorization/SimpleAuthorizer.ts

@@ -0,0 +1,14 @@
+import { UnsupportedHttpError } from '../util/errors/UnsupportedHttpError';
+import { Authorizer, AuthorizerArgs } from './Authorizer';
+
+export class SimpleAuthorizer extends Authorizer {
+  public async canHandle(input: AuthorizerArgs): Promise<void> {
+    if (!input.identifier || !input.permissions) {
+      throw new UnsupportedHttpError('Authorizer requires an identifier and permissions.');
+    }
+  }
+
+  public async handle(): Promise<void> {
+    return undefined;
+  }
+}

src/ldp/permissions/SimplePermissionsExtractor.ts

@@ -0,0 +1,18 @@
+import { Operation } from '../operations/Operation';
+import { PermissionSet } from './PermissionSet';
+import { PermissionsExtractor } from './PermissionsExtractor';
+
+export class SimplePermissionsExtractor extends PermissionsExtractor {
+  public async canHandle(): Promise<void> {
+    return undefined;
+  }
+
+  public async handle(input: Operation): Promise<PermissionSet> {
+    return {
+      read: input.method === 'GET',
+      append: false,
+      write: input.method === 'POST' || input.method === 'PUT',
+      delete: input.method === 'DELETE',
+    };
+  }
+}