phpsessionindb.lib.php

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<?php
/* Copyright (C) 2020 Laurent Destailleur  <eldy@users.sourceforge.net>
 *
 * This program 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 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
 * or see https://www.gnu.org/
 */
 
// This session handler file must be included just after the call of the master.inc.php into main.inc.php
// The $conf is already defined from conf.php file.
// To use it set
// - create table ll_session from the llx_session-disabled.sql file
// - uncomment the include DOL_DOCUMENT_ROOT.'/core/lib/phpsessionindb.inc.php into main.inc.php
// - in your PHP.ini, set:  session.save_handler = user
// The session_set_save_handler() at end of this file will replace default session management.
 
 
function dolSessionOpen($save_path, $session_name)
{
  global $dbsession;
 
  global $dolibarr_main_db_type, $dolibarr_main_db_host;
  global $dolibarr_main_db_user, $dolibarr_main_db_pass, $dolibarr_main_db_name, $dolibarr_main_db_port;
 
  global $dolibarr_session_db_type, $dolibarr_session_db_host;
  global $dolibarr_session_db_user, $dolibarr_session_db_pass, $dolibarr_session_db_name, $dolibarr_session_db_port;
 
  if (empty($dolibarr_session_db_type)) {
    $dolibarr_session_db_type = $dolibarr_main_db_type;
  }
  if (empty($dolibarr_session_db_host)) {
    $dolibarr_session_db_host = $dolibarr_main_db_host;
  }
  if (empty($dolibarr_session_db_user)) {
    $dolibarr_session_db_user = $dolibarr_main_db_user;
  }
  if (empty($dolibarr_session_db_pass)) {
    $dolibarr_session_db_pass = $dolibarr_main_db_pass;
  }
  if (empty($dolibarr_session_db_name)) {
    $dolibarr_session_db_name = $dolibarr_main_db_name;
  }
  if (empty($dolibarr_session_db_port)) {
    $dolibarr_session_db_port = $dolibarr_main_db_port;
  }
  //var_dump('open '.$database_name.' '.$table_name);
 
  $dbsession = getDoliDBInstance($dolibarr_session_db_type, $dolibarr_session_db_host, $dolibarr_session_db_user, $dolibarr_session_db_pass, $dolibarr_session_db_name, (int) $dolibarr_session_db_port);
 
  return true;
}
 
function dolSessionRead($sess_id)
{
  global $dbsession;
  global $sessionlastvalueread;
  global $sessionidfound;
 
  $sql = "SELECT session_id, session_variable FROM ".MAIN_DB_PREFIX."session";
  $sql .= " WHERE session_id = '".$dbsession->escape($sess_id)."'";
 
  // Execute the query
  $resql = $dbsession->query($sql);
  $num_rows = $dbsession->num_rows($resql);
  if ($num_rows == 0) {
    // No session found - return an empty string
    $sessionlastvalueread = '';
    $sessionidfound = '';
    return '';
  } else {
    // Found a session - return the serialized string
    $obj = $dbsession->fetch_object($resql);
    $sessionlastvalueread = $obj->session_variable;
    $sessionidfound = $obj->session_id;
    //var_dump($sessionlastvalueread);
    //var_dump($sessionidfound);
    return $obj->session_variable;
  }
}
 
function dolSessionWrite($sess_id, $val)
{
  global $dbsession;
  global $sessionlastvalueread;
  global $sessionidfound;
 
  //var_dump('write '.$sess_id);
  //var_dump($val);
  //var_dump('sessionlastvalueread='.$sessionlastvalueread.' sessionidfound='.$sessionidfound);
 
  //$sessionlastvalueread='';
  if ($sessionlastvalueread != $val) {
    $time_stamp = dol_now();
 
    if (empty($sessionidfound)) {
      // No session found, insert a new one
      $insert_query = "INSERT INTO ".MAIN_DB_PREFIX."session";
      $insert_query .= "(session_id, session_variable, last_accessed, fk_user, remote_ip, user_agent)";
      $insert_query .= " VALUES ('".$dbsession->escape($sess_id)."', '".$dbsession->escape($val)."', '".$dbsession->idate($time_stamp)."', 0, '".$dbsession->escape(getUserRemoteIP())."', '".$dbsession->escape(substr($_SERVER['HTTP_USER_AGENT'], 0, 255))."')";
 
      $result = $dbsession->query($insert_query);
      if (!$result) {
        dol_print_error($dbsession);
        return false;
      }
    } else {
      if ($sessionidfound != $sess_id) {
        // oops. How can this happen ?
        dol_print_error($dbsession, 'Oops sess_id received in dolSessionWrite differs from the cache value $sessionidfound. How can this happen ?');
        return false;
      }
      /*$sql = "SELECT session_id, session_variable FROM ".MAIN_DB_PREFIX."session";
      $sql .= " WHERE session_id = '".$dbsession->escape($sess_id)."'";
 
      // Execute the query
      $resql = $dbsession->query($sql);
      $num_rows = $dbsession->num_rows($resql);
      if ($num_rows == 0) {
      // No session found, insert a new one
      $insert_query = "INSERT INTO ".MAIN_DB_PREFIX."session";
      $insert_query .= "(session_id, session_variable, last_accessed, fk_user, remote_ip, user_agent)";
      $insert_query .= " VALUES ('".$dbsession->escape($sess_id)."', '".$dbsession->escape($val)."', '".$dbsession->idate($time_stamp)."', 0, '".$dbsession->escape(getUserRemoteIP())."', '".$dbsession->escape(substr($_SERVER['HTTP_USER_AGENT'], 0, 255)."')";
      //var_dump($insert_query);
      $result = $dbsession->query($insert_query);
      if (!$result) {
        dol_print_error($dbsession);
        return false;
      }
      } else {
      */
      // Existing session found - Update the session variables
      $update_query = "UPDATE ".MAIN_DB_PREFIX."session";
      $update_query .= " SET session_variable = '".$dbsession->escape($val)."',";
      $update_query .= " last_accessed = '".$dbsession->idate($time_stamp)."',";
      $update_query .= " remote_ip = '".$dbsession->escape(getUserRemoteIP())."',";
      $update_query .= " user_agent = '".$dbsession->escape($_SERVER['HTTP_USER_AGENT'])."'";
      $update_query .= " WHERE session_id = '".$dbsession->escape($sess_id)."'";
 
      $result = $dbsession->query($update_query);
      if (!$result) {
        dol_print_error($dbsession);
        return false;
      }
    }
  }
 
  return true;
}
 
function dolSessionClose()
{
  global $dbsession;
 
  //var_dump('close');
 
  $dbsession->close();
 
  return true;
}
 
function dolSessionDestroy($sess_id)
{
  global $dbsession;
 
  //var_dump('destroy');
 
  $delete_query = "DELETE FROM ".MAIN_DB_PREFIX."session";
  $delete_query .= " WHERE session_id = '".$dbsession->escape($sess_id)."'";
  $dbsession->query($delete_query);
 
  return true;
}
 
function dolSessionGC($max_lifetime)
{
  global $dbsession;
 
  $time_stamp = dol_now();
 
  $delete_query = "DELETE FROM ".MAIN_DB_PREFIX."session";
  $delete_query .= " WHERE last_accessed < '".$dbsession->idate($time_stamp - $max_lifetime)."'";
 
  $resql = $dbsession->query($delete_query);
  if ($resql) {
    return true;
  } else {
    return false;
  }
}
 
// Call to register user call back functions.
session_set_save_handler("dolSessionOpen", "dolSessionClose", "dolSessionRead", "dolSessionWrite", "dolSessionDestroy", "dolSessionGC");