Get rid of electron.remote

ts/util/attachments.ts

@@ -0,0 +1,50 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { isString } from 'lodash';
+import { join, normalize } from 'path';
+import fse from 'fs-extra';
+
+import { isPathInside } from './isPathInside';
+
+const PATH = 'attachments.noindex';
+const AVATAR_PATH = 'avatars.noindex';
+const STICKER_PATH = 'stickers.noindex';
+const TEMP_PATH = 'temp';
+const DRAFT_PATH = 'drafts.noindex';
+
+const createPathGetter = (subpath: string) => (
+  userDataPath: string
+): string => {
+  if (!isString(userDataPath)) {
+    throw new TypeError("'userDataPath' must be a string");
+  }
+  return join(userDataPath, subpath);
+};
+
+export const getAvatarsPath = createPathGetter(AVATAR_PATH);
+export const getDraftPath = createPathGetter(DRAFT_PATH);
+export const getPath = createPathGetter(PATH);
+export const getStickersPath = createPathGetter(STICKER_PATH);
+export const getTempPath = createPathGetter(TEMP_PATH);
+
+export const createDeleter = (
+  root: string
+): ((relativePath: string) => Promise<void>) => {
+  if (!isString(root)) {
+    throw new TypeError("'root' must be a path");
+  }
+
+  return async (relativePath: string): Promise<void> => {
+    if (!isString(relativePath)) {
+      throw new TypeError("'relativePath' must be a string");
+    }
+
+    const absolutePath = join(root, relativePath);
+    const normalized = normalize(absolutePath);
+    if (!isPathInside(normalized, root)) {
+      throw new Error('Invalid relative path');
+    }
+    await fse.remove(absolutePath);
+  };
+};