New attachment storage system

ts/util/attachmentPath.ts

@@ -0,0 +1,20 @@
+// Copyright 2024 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { join } from 'node:path';
+import { isString } from 'lodash';
+
+import { getRandomBytes } from '../Crypto';
+import * as Bytes from '../Bytes';
+
+export const getRelativePath = (name: string): string => {
+  if (!isString(name)) {
+    throw new TypeError("'name' must be a string");
+  }
+
+  const prefix = name.slice(0, 2);
+  return join(prefix, name);
+};
+
+export const createName = (suffix = ''): string =>
+  `${Bytes.toHex(getRandomBytes(32))}${suffix}`;