feat(ui): add EnableNowPlaying configuration (default true) (#4219)

* Add EnableNowPlaying config option

* Return 501 for disabled NowPlaying

* chore(tests): remove get_now_playing_route test

* Disable now playing events when disabled

* fix(tests): add mutex for thread-safe access to scrobble buffer

Signed-off-by: Deluan <deluan@navidrome.org>

---------

Signed-off-by: Deluan <deluan@navidrome.org>

ui/src/layout/AppBar.jsx

@@ -120,9 +120,9 @@ const CustomUserMenu = ({ onClick, ...rest }) => {
 
   return (
     <>
-      {config.devActivityPanel && permissions === 'admin' && (
-        <NowPlayingPanel />
-      )}
+      {config.devActivityPanel &&
+        permissions === 'admin' &&
+        config.enableNowPlaying && <NowPlayingPanel />}
       {config.devActivityPanel && permissions === 'admin' && <ActivityPanel />}
       <UserMenu {...rest}>
         <PersonalMenu sidebarIsOpen={true} onClick={onClick} />

ui/src/layout/AppBar.test.jsx

@@ -0,0 +1,65 @@
+import React from 'react'
+import { render, screen } from '@testing-library/react'
+import { describe, it, beforeEach, vi } from 'vitest'
+import { Provider } from 'react-redux'
+import { createStore, combineReducers } from 'redux'
+import { activityReducer } from '../reducers'
+import AppBar from './AppBar'
+import config from '../config'
+
+let store
+
+vi.mock('react-admin', () => ({
+  AppBar: ({ userMenu }) => <div data-testid="appbar">{userMenu}</div>,
+  useTranslate: () => (x) => x,
+  usePermissions: () => ({ permissions: 'admin' }),
+  getResources: () => [],
+}))
+
+vi.mock('./NowPlayingPanel', () => ({
+  default: () => <div data-testid="now-playing-panel" />,
+}))
+vi.mock('./ActivityPanel', () => ({
+  default: () => <div data-testid="activity-panel" />,
+}))
+vi.mock('./PersonalMenu', () => ({
+  default: () => <div />,
+}))
+vi.mock('./UserMenu', () => ({
+  default: ({ children }) => <div>{children}</div>,
+}))
+vi.mock('../dialogs/Dialogs', () => ({
+  Dialogs: () => <div />,
+}))
+vi.mock('../dialogs', () => ({
+  AboutDialog: () => <div />,
+}))
+
+describe('<AppBar />', () => {
+  beforeEach(() => {
+    config.devActivityPanel = true
+    config.enableNowPlaying = true
+    store = createStore(combineReducers({ activity: activityReducer }), {
+      activity: { nowPlayingCount: 0 },
+    })
+  })
+
+  it('renders NowPlayingPanel when enabled', () => {
+    render(
+      <Provider store={store}>
+        <AppBar />
+      </Provider>,
+    )
+    expect(screen.getByTestId('now-playing-panel')).toBeInTheDocument()
+  })
+
+  it('hides NowPlayingPanel when disabled', () => {
+    config.enableNowPlaying = false
+    render(
+      <Provider store={store}>
+        <AppBar />
+      </Provider>,
+    )
+    expect(screen.queryByTestId('now-playing-panel')).toBeNull()
+  })
+})