BookStack/app/Http/Controllers/MaintenanceController.php

<?php

namespace BookStack\Http\Controllers;

use BookStack\Notifications\TestEmail;
use BookStack\Uploads\ImageService;
use Illuminate\Http\Request;

class MaintenanceController extends Controller
{
    /**
     * Show the page for application maintenance.
     */
    public function index()
    {
        $this->checkPermission('settings-manage');
        $this->setPageTitle(trans('settings.maint'));

        // Get application version
        $version = trim(file_get_contents(base_path('version')));

        return view('settings.maintenance', ['version' => $version]);
    }

    /**
     * Action to clean-up images in the system.
     */
    public function cleanupImages(Request $request, ImageService $imageService)
    {
        $this->checkPermission('settings-manage');

        $checkRevisions = !($request->get('ignore_revisions', 'false') === 'true');
        $dryRun = !($request->has('confirm'));

        $imagesToDelete = $imageService->deleteUnusedImages($checkRevisions, $dryRun);
        $deleteCount = count($imagesToDelete);
        if ($deleteCount === 0) {
            $this->showWarningNotification(trans('settings.maint_image_cleanup_nothing_found'));
            return redirect('/settings/maintenance')->withInput();
        }

        if ($dryRun) {
            session()->flash('cleanup-images-warning', trans('settings.maint_image_cleanup_warning', ['count' => $deleteCount]));
        } else {
            $this->showSuccessNotification(trans('settings.maint_image_cleanup_success', ['count' => $deleteCount]));
        }

        return redirect('/settings/maintenance#image-cleanup')->withInput();
    }

    /**
     * Action to send a test e-mail to the current user.
     */
    public function sendTestEmail()
    {
        $this->checkPermission('settings-manage');

        try {
            user()->notify(new TestEmail());
            $this->showSuccessNotification(trans('settings.maint_send_test_email_success', ['address' => user()->email]));
        } catch (\Exception $exception) {
            $errorMessage = trans('errors.maintenance_test_email_failure') . "\n" . $exception->getMessage();
            $this->showErrorNotification($errorMessage);
        }

        return redirect('/settings/maintenance#image-cleanup')->withInput();
    }
}