feat: Add acl support

src/storage/ContainerManager.ts

@@ -0,0 +1,16 @@
+import { ResourceIdentifier } from '../ldp/representation/ResourceIdentifier';
+
+/**
+ * Handles the identification of containers in which a resource is contained.
+ */
+export interface ContainerManager {
+  /**
+   * Finds the corresponding container.
+   * Should throw an error if there is no such container (in the case of root).
+   *
+   * @param id - Identifier to find container of.
+   *
+   * @returns The identifier of the container this resource is in.
+   */
+  getContainer: (id: ResourceIdentifier) => Promise<ResourceIdentifier>;
+}

src/storage/UrlContainerManager.ts

@@ -0,0 +1,34 @@
+import { ContainerManager } from './ContainerManager';
+import { ensureTrailingSlash } from '../util/Util';
+import { ResourceIdentifier } from '../ldp/representation/ResourceIdentifier';
+
+/**
+ * Determines containers based on URL decomposition.
+ */
+export class UrlContainerManager implements ContainerManager {
+  private readonly root: string;
+
+  public constructor(root: string) {
+    this.root = this.canonicalUrl(root);
+  }
+
+  public async getContainer(id: ResourceIdentifier): Promise<ResourceIdentifier> {
+    const path = this.canonicalUrl(id.path);
+    if (this.root === path) {
+      throw new Error('Root does not have a container.');
+    }
+
+    const parentPath = new URL('..', path).toString();
+
+    // This probably means there is an issue with the root
+    if (parentPath === path) {
+      throw new Error('URL root reached.');
+    }
+
+    return { path: parentPath };
+  }
+
+  private canonicalUrl(path: string): string {
+    return ensureTrailingSlash(new URL(path).toString());
+  }
+}