[MM-22239] Downloads dropdown (#2227)

* WIP: show/hide temp downloads dropdown

* WIP: Position downloads dropdown correctly under the button

* WIP: Use correct width for dropdown so that right radius and shadows are displayed

* WIP: Add items to download list after finished downloading

* WIP: Add download item base components

* Add "clear all" functionality

* Use type Record<> for downloads saved in config

* Add styling to files in the downloads dropdown

* Open file in folder when clicking it from downloads dropdown. Center svg in parent element

* Update scrollbar styling

* Update scrollbar styling

* Update state of downloaded items if deleted from folder

* Add progress bar in downloads

* Use "x-uncompressed-content-length" in file downloads.

* Keep downloads open when clicking outside their browserview

* Use correct color for downloads dropdown button

* Add better styling to downloads dropdown button

* Allow only 50 download files maximum. Oldest file is being removed if reached

* Autoclose downloads dropdown after 4s of download finish

* Add file thumbnails

* Dont show second dialog if first dismissed

* Add red badge when downloads running and dropdown closed

* Add menu item for Downloads

* Add support for more code file extensions

* Open downloads dropdown instead of folder from the menu

* Run lint:js and fix problems

* Add tests for utils

* Fix issue with dropdown not displaying

* Remove unecessary comment

* Move downloads to separate json file, outside Config

* Add downloads dropdown menu for the 3-dot button

* Dont show dev tools for downloads

* Add cancel download functionality

* Add dark mode styling

* Use View state for downloadsMenu open state

* Fix some style issues

* Add image preview for downloaded images

* Remove extra devTool in weback config

* Fix issue with paths on windows

* Align items left in downloads menu

* Use pretty-bytes for file sizes

* Show download remaining time

* Close downloads dropdown when clicking outside

* Show different units in received bytes when they are different from the total units (kb/mb)

* Dont hide downloads when mattermost view is clicked

* Keep downloads open if download button is clicked

* Use closest() to check for download clicks

* Fix unit tests.
Add tests for new Views and downloadManager
Add @types/jest as devDependency for intellisense

* Remove unecessary tsconfig for jest

* Fix types error

* Add all critical tests for downloadsManager

* WIP: add e2e tests for downloads

* WIP: add e2e tests for downloads

* Rename downloads spec file

* WIP: make vscode debugger work for e2e tests

* Remove unused mock

* Remove defaults for v4 config

* Use electron-mocha for e2e debugger

* Fix e2e tests spawning JsonFileManager twice

* Add async fs functions and add tests for download item UI

* Add async fs functions and add tests for download item UI

* Improve tests with "waitForSelector" to wait for visible elements

* Wait for page load before assertions

* Add tests for file uploads/downloads

* Dont show native notification for completed downloads if dropdown is open

* Increment filenames if file already exists

* Fix antializing in downloads dropdown

* Fix styling of downloads header

* Increase dimensions of green/red icons in downloads

* Fix styling of 3-dot button

* Fix unit tests

* Show 3-dot button only on hover or click

* PR review fixes

* Revert vscode debug fixes

* Mock fs.constants

* Mock fs instead of JsonFileManager in downlaods tests

* Mock fs instead of JsonFileManager in downlaods tests

* Add necessary mocks for downloads manager

* Mark file as deleted if user deleted it

* Fix min-height of downloads dropdown and 3-dot icon position

* Add more tests

* Make size of downloads dropdown dynamic based on content

* Combine log statements

* Close 3-dot menu if user clicks elsewhere

* Move application updates inside downloads dropdown

* Fix update issues

* Fix ipc event payload

* Add missing prop

* Remove unused translations

* Fix failing test

* Fix version unknown

* Remove commented out component

src/main/utils.ts

@@ -3,6 +3,7 @@
 // See LICENSE.txt for license information.
 
 import path from 'path';
+import fs from 'fs';
 
 import {app, BrowserWindow} from 'electron';
 
@@ -98,3 +99,40 @@ export function composeUserAgent() {
 
     return `${filteredUserAgent.join(' ')} Mattermost/${app.getVersion()}`;
 }
+
+export function isStringWithLength(string: unknown): boolean {
+    return typeof string === 'string' && string.length > 0;
+}
+
+export function getPercentage(received: number, total: number) {
+    if (total === 0) {
+        return 0;
+    }
+    return Math.round((received / total) * 100);
+}
+
+export function readFilenameFromContentDispositionHeader(header: string[]) {
+    return header?.join(';')?.match(/(?<=filename=")(.*)(?=")/g)?.[0];
+}
+
+export function doubleSecToMs(d: number): number {
+    return Math.round(d * 1000);
+}
+
+export function shouldIncrementFilename(filepath: string, increment = 0): string {
+    const {dir, name, ext} = path.parse(filepath);
+    const incrementString = increment ? ` (${increment})` : '';
+    const filename = `${name}${incrementString}${ext}`;
+
+    let fileExists = true;
+    try {
+        fs.accessSync(path.join(dir, filename), fs.constants.F_OK);
+    } catch (error) {
+        fileExists = false;
+    }
+
+    if (fileExists) {
+        return shouldIncrementFilename(filepath, increment + 1);
+    }
+    return filename;
+}