<?php
// +-----------------------------------------------------------------------+
// | Piwigo - a PHP based picture gallery                                  |
// +-----------------------------------------------------------------------+
// | Copyright(C) 2008-2010 Piwigo Team                  http://piwigo.org |
// | Copyright(C) 2003-2008 PhpWebGallery Team    http://phpwebgallery.net |
// | Copyright(C) 2002-2003 Pierrick LE GALL   http://le-gall.net/pierrick |
// +-----------------------------------------------------------------------+
// | 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                                          |
// |                                                                       |
// | 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, write to the Free Software           |
// | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
// | USA.                                                                  |
// +-----------------------------------------------------------------------+

function check_upgrade()
{
  if (defined('PHPWG_IN_UPGRADE'))
  {
    return PHPWG_IN_UPGRADE;
  }
  return false;
}

// concerning upgrade, we use the default tables
function prepare_conf_upgrade()
{
  global $prefixeTable;

  // $conf is not used for users tables
  // define cannot be re-defined
  define('CATEGORIES_TABLE', $prefixeTable.'categories');
  define('COMMENTS_TABLE', $prefixeTable.'comments');
  define('CONFIG_TABLE', $prefixeTable.'config');
  define('FAVORITES_TABLE', $prefixeTable.'favorites');
  define('GROUP_ACCESS_TABLE', $prefixeTable.'group_access');
  define('GROUPS_TABLE', $prefixeTable.'groups');
  define('HISTORY_TABLE', $prefixeTable.'history');
  define('HISTORY_SUMMARY_TABLE', $prefixeTable.'history_summary');
  define('IMAGE_CATEGORY_TABLE', $prefixeTable.'image_category');
  define('IMAGES_TABLE', $prefixeTable.'images');
  define('SESSIONS_TABLE', $prefixeTable.'sessions');
  define('SITES_TABLE', $prefixeTable.'sites');
  define('USER_ACCESS_TABLE', $prefixeTable.'user_access');
  define('USER_GROUP_TABLE', $prefixeTable.'user_group');
  define('USERS_TABLE', $prefixeTable.'users');
  define('USER_INFOS_TABLE', $prefixeTable.'user_infos');
  define('USER_FEED_TABLE', $prefixeTable.'user_feed');
  define('WAITING_TABLE', $prefixeTable.'waiting');
  define('RATE_TABLE', $prefixeTable.'rate');
  define('USER_CACHE_TABLE', $prefixeTable.'user_cache');
  define('USER_CACHE_CATEGORIES_TABLE', $prefixeTable.'user_cache_categories');
  define('CADDIE_TABLE', $prefixeTable.'caddie');
  define('UPGRADE_TABLE', $prefixeTable.'upgrade');
  define('SEARCH_TABLE', $prefixeTable.'search');
  define('USER_MAIL_NOTIFICATION_TABLE', $prefixeTable.'user_mail_notification');
  define('TAGS_TABLE', $prefixeTable.'tags');
  define('IMAGE_TAG_TABLE', $prefixeTable.'image_tag');
  define('PLUGINS_TABLE', $prefixeTable.'plugins');
  define('OLD_PERMALINKS_TABLE', $prefixeTable.'old_permalinks');
  define('THEMES_TABLE', $prefixeTable.'themes');
  define('LANGUAGES_TABLE', $prefixeTable.'languages');
}

// Deactivate all non-standard plugins
function deactivate_non_standard_plugins()
{
  global $page;

  $standard_plugins = array(
    'admin_multi_view',
    'c13y_upgrade',
    'event_tracer',
    'language_switch',
    'LocalFilesEditor'
    );

  $query = '
SELECT id
FROM '.PREFIX_TABLE.'plugins
WHERE state = \'active\'
AND id NOT IN (\'' . implode('\',\'', $standard_plugins) . '\')
;';

  $result = pwg_query($query);
  $plugins = array();
  while ($row = pwg_db_fetch_assoc($result))
  {
    array_push($plugins, $row['id']);
  }

  if (!empty($plugins))
  {
    $query = '
UPDATE '.PREFIX_TABLE.'plugins
SET state=\'inactive\'
WHERE id IN (\'' . implode('\',\'', $plugins) . '\')
;';
    pwg_query($query);

    array_push($page['infos'],
      l10n('As a precaution, following plugins have been deactivated. You must check for plugins upgrade before reactiving them:').'<p><i>'.implode(', ', $plugins).'</i></p>');
  }
}

// Check access rights
function check_upgrade_access_rights()
{
  global $conf, $page, $current_release;

  if (version_compare($current_release, '2.0', '>=') and isset($_COOKIE[session_name()]))
  {
    // Check if user is already connected as webmaster
    session_start();
    if (!empty($_SESSION['pwg_uid']))
    {
      $query = '
SELECT status
  FROM '.USER_INFOS_TABLE.'
  WHERE user_id = '.$_SESSION['pwg_uid'].'
;';
      pwg_query($query);

      $row = pwg_db_fetch_assoc(pwg_query($query));
      if (isset($row['status']) and $row['status'] == 'webmaster')
      {
        define('PHPWG_IN_UPGRADE', true);
        return;
      }
    }
  }

  if (!isset($_POST['username']) or !isset($_POST['password']))
  {
    return;
  }

  $username = $_POST['username'];
  $password = $_POST['password'];

  if(!@get_magic_quotes_gpc())
  {
    $username = pwg_db_real_escape_string($username);
  }

  if (version_compare($current_release, '2.0', '<'))
  {
    $username = utf8_decode($username);
    $password = utf8_decode($password);
  }

  if (version_compare($current_release, '1.5', '<'))
  {
    $query = '
SELECT password, status
FROM '.USERS_TABLE.'
WHERE username = \''.$username.'\'
;';
  }
  else
  {
    $query = '
SELECT u.password, ui.status
FROM '.USERS_TABLE.' AS u
INNER JOIN '.USER_INFOS_TABLE.' AS ui
ON u.'.$conf['user_fields']['id'].'=ui.user_id
WHERE '.$conf['user_fields']['username'].'=\''.$username.'\'
;';
  }
  $row = pwg_db_fetch_assoc(pwg_query($query));

  if (!isset($conf['pass_convert']))
  {
    $conf['pass_convert'] = create_function('$s', 'return md5($s);');
  }

  if ($row['password'] != $conf['pass_convert']($password))
  {
    array_push($page['errors'], l10n('Invalid password!'));
  }
  elseif ($row['status'] != 'admin' and $row['status'] != 'webmaster')
  {
    array_push($page['errors'], l10n('You do not have access rights to run upgrade'));
  }
  else
  {
    define('PHPWG_IN_UPGRADE', true);
  }
}

/**
 * which upgrades are available ?
 *
 * @return array
 */
function get_available_upgrade_ids()
{
  $upgrades_path = PHPWG_ROOT_PATH.'install/db';

  $available_upgrade_ids = array();

  if ($contents = opendir($upgrades_path))
  {
    while (($node = readdir($contents)) !== false)
    {
      if (is_file($upgrades_path.'/'.$node)
          and preg_match('/^(.*?)-database\.php$/', $node, $match))
      {
        array_push($available_upgrade_ids, $match[1]);
      }
    }
  }
  natcasesort($available_upgrade_ids);

  return $available_upgrade_ids;
}


/**
 * returns true if there are available upgrade files
 */
function check_upgrade_feed()
{
  // retrieve already applied upgrades
  $query = '
SELECT id
  FROM '.UPGRADE_TABLE.'
;';
  $applied = array_from_query($query, 'id');

  // retrieve existing upgrades
  $existing = get_available_upgrade_ids();

  // which upgrades need to be applied?
  return (count(array_diff($existing, $applied)) > 0);
}

function upgrade_db_connect()
{
  global $conf;

  try
  {
    $pwg_db_link = pwg_db_connect($conf['db_host'], $conf['db_user'], $conf['db_password'], $conf['db_base']);
    if ($pwg_db_link)
    {
      pwg_db_check_version();
    }
  }
  catch (Exception $e)
  {
    my_error(l10n($e->getMessage()), true); 
  }
}
?>