add cache and loader for big menu

lib/Controller/NavController.php

@@ -21,10 +21,12 @@ namespace OCA\SideMenu\Controller;
 use OC;
 use OC\App\AppStore\Fetcher\CategoryFetcher;
 use OC\URLGenerator;
+use OCA\SideMenu\AppInfo\Application;
 use OCA\SideMenu\Service\AppRepository;
 use OCA\SideMenu\Service\ConfigProxy;
 use OCP\AppFramework\Controller;
 use OCP\AppFramework\Http\JSONResponse;
+use OCP\IConfig;
 use OCP\IL10N;
 use OCP\IRequest;
 use OCP\IUserSession;
@@ -37,6 +39,11 @@ class NavController extends Controller
      */
     protected $config;
 
+    /**
+     * @var IConfig
+     */
+    protected $iConfig;
+
     /**
      * @var AppRepository
      */
@@ -60,6 +67,7 @@ class NavController extends Controller
     public function __construct(
         string $appName,
         IRequest $request,
+        IConfig $iConfig,
         ConfigProxy $config,
         AppRepository $appRepository,
         CategoryFetcher $categoryFetcher,
@@ -70,6 +78,7 @@ class NavController extends Controller
         parent::__construct($appName, $request);
 
         $this->config = $config;
+        $this->iConfig = $iConfig;
         $this->appRepository = $appRepository;
         $this->categoryFetcher = $categoryFetcher;
         $this->l10nFactory = $l10nFactory;
@@ -87,7 +96,6 @@ class NavController extends Controller
     {
         $apps = $this->appRepository->getVisibleApps();
         $currentLanguage = substr($this->l10nFactory->findLanguage(), 0, 2);
-        $categoriesLabels = $this->categoryFetcher->get();
         $externalSitesInTopMenu = $this->config->getAppValueBool('external-sites-in-top-menu', '0');
         $user = OC::$server[IUserSession::class]->getUser();
         $appsCategories = [];
@@ -100,6 +108,14 @@ class NavController extends Controller
             ]);
         }
 
+        $categoriesLabels = $this->config->getAppValueArray('cache-categories', '[]');
+
+        if (empty($categoriesLabels)) {
+            $categoriesLabels = $this->categoryFetcher->get();
+
+            $this->iConfig->setAppValue(Application::APP_ID, 'cache-categories', json_encode($categoriesLabels));
+        }
+
         $topMenuApps = $this->config->getAppValueArray('top-menu-apps', '[]');
         $userTopMenuApps = $this->config->getUserValueArray($user, 'top-menu-apps', '[]');
 
@@ -135,7 +151,7 @@ class NavController extends Controller
             foreach ($categories as $category) {
                 if (!isset($items[$category])) {
                     $items[$category] = [
-                        'name' => $categoriesLabels[$category],
+                        'name' => $categoriesLabels[$category] ?? $category,
                         'apps' => [],
                     ];
                 }