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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   * Lib API functions.
  19   *
  20   * @package   report_usersessions
  21   * @copyright 2014 Totara Learning Solutions Ltd {@link http://www.totaralms.com/}
  22   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   * @author    Petr Skoda <petr.skoda@totaralms.com>
  24   */
  25  
  26  defined('MOODLE_INTERNAL') || die;
  27  
  28  require_once (__DIR__ . '/lib.php');
  29  
  30  /**
  31   * Show user friendly duration since last activity.
  32   *
  33   * @param int $duration in seconds
  34   * @return string
  35   */
  36  function report_usersessions_format_duration($duration) {
  37  
  38      // NOTE: The session duration is not accurate thanks to
  39      //       $CFG->session_update_timemodified_frequency setting.
  40      //       Also there is no point in showing days here because
  41      //       the session cleanup should purge all stale sessions
  42      //       regularly.
  43  
  44      if ($duration < 60) {
  45          return get_string('now');
  46      }
  47  
  48      if ($duration < 60 * 60 * 2) {
  49          $minutes = (int)($duration / 60);
  50          $ago = $minutes . ' ' . get_string('minutes');
  51          return get_string('ago', 'core_message', $ago);
  52      }
  53  
  54      $hours = (int)($duration / (60 * 60));
  55      $ago = $hours . ' ' . get_string('hours');
  56      return get_string('ago', 'core_message', $ago);
  57  }
  58  
  59  /**
  60   * Show some user friendly IP address info.
  61   *
  62   * @param string $ip
  63   * @return string
  64   */
  65  function report_usersessions_format_ip($ip) {
  66      if (strpos($ip, ':') !== false) {
  67          // For now ipv6 is not supported yet.
  68          return $ip;
  69      }
  70      $url = new moodle_url('/iplookup/index.php', array('ip' => $ip));
  71      return html_writer::link($url, $ip);
  72  }
  73  
  74  /**
  75   * Kill user session.
  76   *
  77   * @param int $id
  78   * @return void
  79   */
  80  function report_usersessions_kill_session($id) {
  81      global $DB, $USER;
  82  
  83      $session = $DB->get_record('sessions', array('id' => $id, 'userid' => $USER->id), 'id, sid');
  84  
  85      if (!$session or $session->sid === session_id()) {
  86          // Do not delete the current session!
  87          return;
  88      }
  89  
  90      \core\session\manager::kill_session($session->sid);
  91  }