BookStack/app/Http/Controllers/SettingController.php

<?php namespace BookStack\Http\Controllers;

use BookStack\Auth\User;
use BookStack\Uploads\ImageRepo;
use Illuminate\Http\Request;

class SettingController extends Controller
{
    protected $imageRepo;

    /**
     * SettingController constructor.
     */
    public function __construct(ImageRepo $imageRepo)
    {
        $this->imageRepo = $imageRepo;
        parent::__construct();
    }

    /**
     * Display a listing of the settings.
     */
    public function index()
    {
        $this->checkPermission('settings-manage');
        $this->setPageTitle(trans('settings.settings'));

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

        return view('settings.index', [
            'version' => $version,
            'guestUser' => User::getDefault()
        ]);
    }

    /**
     * Update the specified settings in storage.
     */
    public function update(Request $request)
    {
        $this->preventAccessInDemoMode();
        $this->checkPermission('settings-manage');
        $this->validate($request, [
            'app_logo' => 'nullable|' . $this->getImageValidationRules(),
        ]);

        // Cycles through posted settings and update them
        foreach ($request->all() as $name => $value) {
            if (strpos($name, 'setting-') !== 0) {
                continue;
            }
            $key = str_replace('setting-', '', trim($name));
            setting()->put($key, $value);
        }

        // Update logo image if set
        if ($request->hasFile('app_logo')) {
            $logoFile = $request->file('app_logo');
            $this->imageRepo->destroyByType('system');
            $image = $this->imageRepo->saveNew($logoFile, 'system', 0, null, 86);
            setting()->put('app-logo', $image->url);
        }

        // Clear logo image if requested
        if ($request->get('app_logo_reset', null)) {
            $this->imageRepo->destroyByType('system');
            setting()->remove('app-logo');
        }

        $this->showSuccessNotification(trans('settings.settings_save_success'));
        $redirectLocation = '/settings#' . $request->get('section', '');
        return redirect(rtrim($redirectLocation, '#'));
    }
}