--- /dev/null
+<?php
+
+namespace Drupal\system\Controller;
+
+use Drupal\Core\Controller\ControllerBase;
+
+/**
+ * Controller for admin section.
+ */
+class AdminController extends ControllerBase {
+
+ /**
+ * Prints a listing of admin tasks, organized by module.
+ *
+ * @return array
+ * A render array containing the listing.
+ */
+ public function index() {
+ $module_info = system_get_info('module');
+ foreach ($module_info as $module => $info) {
+ $module_info[$module] = new \stdClass();
+ $module_info[$module]->info = $info;
+ }
+
+ uasort($module_info, 'system_sort_modules_by_info_name');
+ $menu_items = [];
+
+ foreach ($module_info as $module => $info) {
+ // Only display a section if there are any available tasks.
+ if ($admin_tasks = system_get_module_admin_tasks($module, $info->info)) {
+ // Sort links by title.
+ uasort($admin_tasks, ['\Drupal\Component\Utility\SortArray', 'sortByTitleElement']);
+ // Move 'Configure permissions' links to the bottom of each section.
+ $permission_key = "user.admin_permissions.$module";
+ if (isset($admin_tasks[$permission_key])) {
+ $permission_task = $admin_tasks[$permission_key];
+ unset($admin_tasks[$permission_key]);
+ $admin_tasks[$permission_key] = $permission_task;
+ }
+
+ $menu_items[$info->info['name']] = [$info->info['description'], $admin_tasks];
+ }
+ }
+
+ $output = [
+ '#theme' => 'system_admin_index',
+ '#menu_items' => $menu_items,
+ ];
+
+ return $output;
+ }
+
+}