castopod/app/Filters/Permission.php

<?php namespace App\Filters;

use App\Models\PodcastModel;
use Config\Services;
use CodeIgniter\HTTP\RequestInterface;
use CodeIgniter\HTTP\ResponseInterface;
use CodeIgniter\Filters\FilterInterface;
use Myth\Auth\Exceptions\PermissionException;

class Permission implements FilterInterface
{
    /**
     * Do whatever processing this filter needs to do.
     * By default it should not return anything during
     * normal execution. However, when an abnormal state
     * is found, it should return an instance of
     * CodeIgniter\HTTP\Response. If it does, script
     * execution will end and that Response will be
     * sent back to the client, allowing for error pages,
     * redirects, etc.
     *
     * @param \CodeIgniter\HTTP\RequestInterface $request
     * @param array|null                         $params
     *
     * @return mixed
     */
    public function before(RequestInterface $request, $params = null)
    {
        if (!function_exists('logged_in')) {
            helper('auth');
        }

        if (empty($params)) {
            return;
        }

        $authenticate = Services::authentication();

        // if no user is logged in then send to the login form
        if (!$authenticate->check()) {
            session()->set('redirect_url', current_url());
            return redirect('login');
        }

        helper('misc');
        $authorize = Services::authorization();
        $router = Services::router();
        $routerParams = $router->params();
        $result = false;

        // Check if user has at least one of the permissions
        foreach ($params as $permission) {
            // check if permission is for a specific podcast
            if (
                (startsWith($permission, 'podcast-') ||
                    startsWith($permission, 'podcast_episodes-')) &&
                count($routerParams) > 0
            ) {
                if (
                    $group_id = (new PodcastModel())->getContributorGroupId(
                        $authenticate->id(),
                        $routerParams[0]
                    )
                ) {
                    if (
                        $authorize->groupHasPermission($permission, $group_id)
                    ) {
                        $result = true;
                        break;
                    }
                }
            } elseif (
                $authorize->hasPermission($permission, $authenticate->id())
            ) {
                $result = true;
                break;
            }
        }

        if (!$result) {
            if ($authenticate->silent()) {
                $redirectURL = session('redirect_url') ?? '/';
                unset($_SESSION['redirect_url']);
                return redirect()
                    ->to($redirectURL)
                    ->with('error', lang('Auth.notEnoughPrivilege'));
            } else {
                throw new PermissionException(lang('Auth.notEnoughPrivilege'));
            }
        }
    }

    //--------------------------------------------------------------------

    /**
     * Allows After filters to inspect and modify the response
     * object as needed. This method does not allow any way
     * to stop execution of other after filters, short of
     * throwing an Exception or Error.
     *
     * @param \CodeIgniter\HTTP\RequestInterface  $request
     * @param \CodeIgniter\HTTP\ResponseInterface $response
     * @param array|null                          $arguments
     *
     * @return void
     */
    public function after(
        RequestInterface $request,
        ResponseInterface $response,
        $arguments = null
    ) {
    }

    //--------------------------------------------------------------------
}