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   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  /**
  18   * A scheduled task.
  19   *
  20   * @package    repository_onedrive
  21   * @copyright  2017 Damyon Wiese
  22   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  
  25  namespace repository_onedrive;
  26  
  27  use \core\task\scheduled_task;
  28  use DateTime;
  29  use DateInterval;
  30  use repository_exception;
  31  use \core\oauth2\rest_exception;
  32  
  33  defined('MOODLE_INTERNAL') || die();
  34  
  35  require_once($CFG->dirroot . '/repository/lib.php');
  36  
  37  /**
  38   * Simple task to delete temporary permission records.
  39   * @package    repository_onedrive
  40   * @copyright  2017 Damyon Wiese
  41   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  42   */
  43  class remove_temp_access_task extends scheduled_task {
  44  
  45      /**
  46       * Get a descriptive name for this task (shown to admins).
  47       *
  48       * @return string
  49       */
  50      public function get_name() {
  51          return get_string('removetempaccesstask', 'repository_onedrive');
  52      }
  53  
  54      /**
  55       * Do the job.
  56       * Throw exceptions on errors (the job will be retried).
  57       */
  58      public function execute() {
  59          $accessrecords = access::get_records();
  60          $expires = new DateTime();
  61          $expires->sub(new DateInterval("P7D"));
  62          $timestamp = $expires->getTimestamp();
  63  
  64          $issuerid = get_config('onedrive', 'issuerid');
  65          $issuer = \core\oauth2\api::get_issuer($issuerid);
  66  
  67          // Add the current user as an OAuth writer.
  68          $systemauth = \core\oauth2\api::get_system_oauth_client($issuer);
  69  
  70          if ($systemauth === false) {
  71              $details = 'Cannot connect as system user';
  72              throw new repository_exception('errorwhilecommunicatingwith', 'repository', '', $details);
  73          }
  74          $systemservice = new \repository_onedrive\rest($systemauth);
  75  
  76          foreach ($accessrecords as $access) {
  77              if ($access->get('timemodified') < $timestamp) {
  78                  $params = ['permissionid' => $access->get('permissionid'), 'itemid' => $access->get('itemid')];
  79                  try {
  80                      $systemservice->call('delete_permission', $params);
  81                  } catch (rest_exception $re) {
  82                      // We log and give up here or we will always fail for eternity.
  83                      mtrace('Failed to remove access from file: ' . $access->get('itemid'));
  84                  }
  85                  $access->delete();
  86              }
  87          }
  88      }
  89  
  90  }