feat: add simple operation handlers

src/ldp/operations/SimpleDeleteOperationHandler.ts

@@ -0,0 +1,25 @@
+import { Operation } from './Operation';
+import { OperationHandler } from './OperationHandler';
+import { ResourceStore } from '../../storage/ResourceStore';
+import { ResponseDescription } from './ResponseDescription';
+import { UnsupportedHttpError } from '../../util/errors/UnsupportedHttpError';
+
+export class SimpleDeleteOperationHandler extends OperationHandler {
+  private readonly store: ResourceStore;
+
+  public constructor(store: ResourceStore) {
+    super();
+    this.store = store;
+  }
+
+  public async canHandle(input: Operation): Promise<void> {
+    if (input.method !== 'DELETE') {
+      throw new UnsupportedHttpError('This handler only supports DELETE operations.');
+    }
+  }
+
+  public async handle(input: Operation): Promise<ResponseDescription> {
+    await this.store.deleteResource(input.target);
+    return { identifier: input.target };
+  }
+}

src/ldp/operations/SimpleGetOperationHandler.ts

@@ -0,0 +1,25 @@
+import { Operation } from './Operation';
+import { OperationHandler } from './OperationHandler';
+import { ResourceStore } from '../../storage/ResourceStore';
+import { ResponseDescription } from './ResponseDescription';
+import { UnsupportedHttpError } from '../../util/errors/UnsupportedHttpError';
+
+export class SimpleGetOperationHandler extends OperationHandler {
+  private readonly store: ResourceStore;
+
+  public constructor(store: ResourceStore) {
+    super();
+    this.store = store;
+  }
+
+  public async canHandle(input: Operation): Promise<void> {
+    if (input.method !== 'GET') {
+      throw new UnsupportedHttpError('This handler only supports GET operations.');
+    }
+  }
+
+  public async handle(input: Operation): Promise<ResponseDescription> {
+    const body = await this.store.getRepresentation(input.target, input.preferences);
+    return { identifier: input.target, body };
+  }
+}

src/ldp/operations/SimplePostOperationHandler.ts

@@ -0,0 +1,28 @@
+import { Operation } from './Operation';
+import { OperationHandler } from './OperationHandler';
+import { ResourceStore } from '../../storage/ResourceStore';
+import { ResponseDescription } from './ResponseDescription';
+import { UnsupportedHttpError } from '../../util/errors/UnsupportedHttpError';
+
+export class SimplePostOperationHandler extends OperationHandler {
+  private readonly store: ResourceStore;
+
+  public constructor(store: ResourceStore) {
+    super();
+    this.store = store;
+  }
+
+  public async canHandle(input: Operation): Promise<void> {
+    if (input.method !== 'POST') {
+      throw new UnsupportedHttpError('This handler only supports POST operations.');
+    }
+    if (!input.body) {
+      throw new UnsupportedHttpError('POST operations require a body.');
+    }
+  }
+
+  public async handle(input: Operation): Promise<ResponseDescription> {
+    const identifier = await this.store.addResource(input.target, input.body);
+    return { identifier };
+  }
+}