<?php
/**
 * ---------------------------------------------------------------------
 * GLPI - Gestionnaire Libre de Parc Informatique
 * Copyright (C) 2015-2021 Teclib' and contributors.
 *
 * http://glpi-project.org
 *
 * based on GLPI - Gestionnaire Libre de Parc Informatique
 * Copyright (C) 2003-2014 by the INDEPNET Development Team.
 *
 * ---------------------------------------------------------------------
 *
 * LICENSE
 *
 * This file is part of GLPI.
 *
 * GLPI is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * GLPI is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GLPI. If not, see <http://www.gnu.org/licenses/>.
 * ---------------------------------------------------------------------
 */

namespace Glpi\CalDAV\Plugin;

if (!defined('GLPI_ROOT')) {
   die("Sorry. You can't access this file directly");
}

use CommonDBTM;
use Glpi\CalDAV\Backend\Principal;
use Glpi\CalDAV\Traits\CalDAVPrincipalsTrait;
use Glpi\CalDAV\Traits\CalDAVUriUtilTrait;
use PlanningExternalEvent;
use Sabre\CalDAV\Calendar;
use Sabre\CalDAV\CalendarObject;
use Sabre\DAVACL\IACL;
use Sabre\DAVACL\Plugin;
use Session;

/**
 * ACL plugin for CalDAV server.
 *
 * @since 9.5.0
 */
class Acl extends Plugin {

   use CalDAVPrincipalsTrait;
   use CalDAVUriUtilTrait;

   public $principalCollectionSet = [
      Principal::PREFIX_GROUPS,
      Principal::PREFIX_USERS,
   ];

   public $allowUnauthenticatedAccess = false;

   public function getAcl($node) {
      if (is_string($node)) {
         $node = $this->server->tree->getNodeForPath($node);
      }

      $acl = parent::getAcl($node);

      if (!($node instanceof IACL) || ($owner_path = $node->getOwner()) === null
          || !$this->canViewPrincipalObjects($owner_path)) {
         return $acl;
      }

      $acl[] = [
         'principal' => '{DAV:}authenticated',
         'privilege' => '{DAV:}read',
         'protected' => true,
      ];

      if ($node instanceof Calendar && Session::haveRight(PlanningExternalEvent::$rightname, UPDATE)) {
         // If user can update external events, then he is able to write on calendar to create new events.
         $acl[] = [
            'principal' => '{DAV:}authenticated',
            'privilege' => '{DAV:}write',
            'protected' => true,
         ];
      } else if ($node instanceof CalendarObject) {
         $item = $this->getCalendarItemForPath($node->getName());
         if ($item instanceof CommonDBTM && $item->can($item->fields['id'], UPDATE)) {
            $acl[] = [
               'principal' => '{DAV:}authenticated',
               'privilege' => '{DAV:}write',
               'protected' => true,
            ];
         }
      }

      return $acl;
   }
}
