nilsteampassnet / TeamPass

sources/main.functions.php

<?php

declare(strict_types=1);

/**
 * Teampass - a collaborative passwords manager.
 * ---
 * This file is part of the TeamPass project.
 * 
 * TeamPass 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, version 3 of the License.
 * 
 * TeamPass 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/>.
 * 
 * Certain components of this file may be under different licenses. For
 * details, see the `licenses` directory or individual file headers.
 * ---
 * @file      main.functions.php
 * @author    Nils Laumaillé (nils@teampass.net)
 * @copyright 2009-2025 Teampass.net
 * @license   GPL-3.0
 * @see       https://www.teampass.net
 */

use LdapRecord\Connection;
use Elegant\Sanitizer\Sanitizer;
use voku\helper\AntiXSS;
use Hackzilla\PasswordGenerator\Generator\ComputerPasswordGenerator;
use Hackzilla\PasswordGenerator\RandomGenerator\Php7RandomGenerator;
use TeampassClasses\SessionManager\SessionManager;
use Symfony\Component\HttpFoundation\Request as SymfonyRequest;
use TeampassClasses\Language\Language;
use TeampassClasses\NestedTree\NestedTree;
use Defuse\Crypto\Key;
use Defuse\Crypto\Crypto;
use Defuse\Crypto\KeyProtectedByPassword;
use Defuse\Crypto\File as CryptoFile;
use Defuse\Crypto\Exception as CryptoException;
use TeampassClasses\PasswordManager\PasswordManager;
use Symfony\Component\Process\PhpExecutableFinder;
use TeampassClasses\Encryption\Encryption;
use TeampassClasses\ConfigManager\ConfigManager;
use TeampassClasses\EmailService\EmailService;
use TeampassClasses\EmailService\EmailSettings;

header('Content-type: text/html; charset=utf-8');
header('Cache-Control: no-cache, must-revalidate');

loadClasses('DB');
$session = SessionManager::getSession();

// Load config if $SETTINGS not defined
$configManager = new ConfigManager();
$SETTINGS = $configManager->getAllSettings();

/**
 * Checks if a string is hex encoded
 *
 * @param string $str
 * @return boolean
 */
function isHex(string $str): bool
{
    if (str_starts_with(strtolower($str), '0x')) {
        $str = substr($str, 2);
    }

    return ctype_xdigit($str);
}

/**
 * Defuse cryption function.
 *
 * @param string $message   what to de/crypt
 * @param string $ascii_key key to use
 * @param string $type      operation to perform
 * @param array  $SETTINGS  Teampass settings
 *
 * @return array
 */
function cryption(string $message, string $ascii_key, string $type, ?array $SETTINGS = []): array
{
    $ascii_key = empty($ascii_key) === true ? file_get_contents(SECUREPATH.'/'.SECUREFILE) : $ascii_key;
    $err = false;
    
    // convert KEY
    $key = Key::loadFromAsciiSafeString($ascii_key);
    try {
        if ($type === 'encrypt') {
            $text = Crypto::encrypt($message, $key);
        } elseif ($type === 'decrypt') {
            $text = Crypto::decrypt($message, $key);
        }
    } catch (CryptoException\WrongKeyOrModifiedCiphertextException $ex) {
        error_log('TEAMPASS-Error-Wrong key or modified ciphertext: ' . $ex->getMessage());
        $err = 'wrong_key_or_modified_ciphertext';
    } catch (CryptoException\BadFormatException $ex) {
        error_log('TEAMPASS-Error-Bad format exception: ' . $ex->getMessage());
        $err = 'bad_format';
    } catch (CryptoException\EnvironmentIsBrokenException $ex) {
        error_log('TEAMPASS-Error-Environment: ' . $ex->getMessage());
        $err = 'environment_error';
    } catch (CryptoException\IOException $ex) {
        error_log('TEAMPASS-Error-IO: ' . $ex->getMessage());
        $err = 'io_error';
    } catch (Exception $ex) {
        error_log('TEAMPASS-Error-Unexpected exception: ' . $ex->getMessage());
        $err = 'unexpected_error';
    }

    return [
        'string' => $text ?? '',
        'error' => $err,
    ];
}

/**
 * Generating a defuse key.
 *
 * @return string
 */
function defuse_generate_key()
{
    $key = Key::createNewRandomKey();
    $key = $key->saveToAsciiSafeString();
    return $key;
}

/**
 * Generate a Defuse personal key.
 *
 * @param string $psk psk used
 *
 * @return string
 */
function defuse_generate_personal_key(string $psk): string
{
    $protected_key = KeyProtectedByPassword::createRandomPasswordProtectedKey($psk);
    return $protected_key->saveToAsciiSafeString(); // save this in user table
}

/**
 * Validate persoanl key with defuse.
 *
 * @param string $psk                   the user's psk
 * @param string $protected_key_encoded special key
 *
 * @return string
 */
function defuse_validate_personal_key(string $psk, string $protected_key_encoded): string
{
    try {
        $protected_key_encoded = KeyProtectedByPassword::loadFromAsciiSafeString($protected_key_encoded);
        $user_key = $protected_key_encoded->unlockKey($psk);
        $user_key_encoded = $user_key->saveToAsciiSafeString();
    } catch (CryptoException\EnvironmentIsBrokenException $ex) {
        return 'Error - Major issue as the encryption is broken.';
    } catch (CryptoException\WrongKeyOrModifiedCiphertextException $ex) {
        return 'Error - The saltkey is not the correct one.';
    }

    return $user_key_encoded;
    // store it in session once user has entered his psk
}

/**
 * Decrypt a defuse string if encrypted.
 *
 * @param string $value Encrypted string
 *
 * @return string Decrypted string
 */
function defuseReturnDecrypted(string $value): string
{
    if (substr($value, 0, 3) === 'def') {
        $value = cryption($value, '', 'decrypt')['string'];
    }

    return $value;
}

/**
 * Trims a string depending on a specific string.
 *
 * @param string|array $chaine  what to trim
 * @param string       $element trim on what
 *
 * @return string
 */
function trimElement($chaine, string $element): string
{
    if (! empty($chaine)) {
        if (is_array($chaine) === true) {
            $chaine = implode(';', $chaine);
        }
        $chaine = trim($chaine);
        if (substr($chaine, 0, 1) === $element) {
            $chaine = substr($chaine, 1);
        }
        if (substr($chaine, strlen($chaine) - 1, 1) === $element) {
            $chaine = substr($chaine, 0, strlen($chaine) - 1);
        }
    }

    return $chaine;
}

/**
 * Permits to suppress all "special" characters from string.
 *
 * @param string $string  what to clean
 * @param bool   $special use of special chars?
 *
 * @return string
 */
function cleanString(string $string, bool $special = false): string
{
    // Create temporary table for special characters escape
    $tabSpecialChar = [];
    for ($i = 0; $i <= 31; ++$i) {
        $tabSpecialChar[] = chr($i);
    }
    array_push($tabSpecialChar, '<br />');
    if ((int) $special === 1) {
        $tabSpecialChar = array_merge($tabSpecialChar, ['</li>', '<ul>', '<ol>']);
    }

    return str_replace($tabSpecialChar, "\n", $string);
}

/**
 * Erro manager for DB.
 *
 * @param array $params output from query
 *
 * @return void
 */
function db_error_handler(array $params): void
{
    echo 'Error: ' . $params['error'] . "<br>\n";
    echo 'Query: ' . $params['query'] . "<br>\n";
    throw new Exception('Error - Query', 1);
}

/**
 * Identify user's rights
 *
 * @param string|array $groupesVisiblesUser  [description]
 * @param string|array $groupesInterditsUser [description]
 * @param string       $isAdmin              [description]
 * @param string       $idFonctions          [description]
 *
 * @return bool
 */
function identifyUserRights(
    $groupesVisiblesUser,
    $groupesInterditsUser,
    $isAdmin,
    $idFonctions,
    $SETTINGS
) {
    $session = SessionManager::getSession();
    $tree = new NestedTree(prefixTable('nested_tree'), 'id', 'parent_id', 'title');

    // Check if user is ADMINISTRATOR    
    (int) $isAdmin === 1 ?
        identAdmin(
            $idFonctions,
            $SETTINGS, /** @scrutinizer ignore-type */
            $tree
        )
        :
        identUser(
            $groupesVisiblesUser,
            $groupesInterditsUser,
            $idFonctions,
            $SETTINGS, /** @scrutinizer ignore-type */
            $tree
        );

    // update user's timestamp
    DB::update(
        prefixTable('users'),
        [
            'timestamp' => time(),
        ],
        'id=%i',
        $session->get('user-id')
    );

    return true;
}

/**
 * Identify administrator.
 *
 * @param string $idFonctions Roles of user
 * @param array  $SETTINGS    Teampass settings
 * @param object $tree        Tree of folders
 *
 * @return bool
 */
function identAdmin($idFonctions, $SETTINGS, $tree)
{
    
    $session = SessionManager::getSession();
    $groupesVisibles = [];
    $session->set('user-personal_folders', []);
    $session->set('user-accessible_folders', []);
    $session->set('user-no_access_folders', []);
    $session->set('user-personal_visible_folders', []);
    $session->set('user-read_only_folders', []);
    $session->set('system-list_restricted_folders_for_items', []);
    $session->set('system-list_folders_editable_by_role', []);
    $session->set('user-list_folders_limited', []);
    $session->set('user-forbiden_personal_folders', []);
    
    // Get list of Folders
    $rows = DB::query('SELECT id FROM ' . prefixTable('nested_tree') . ' WHERE personal_folder = %i', 0);
    foreach ($rows as $record) {
        array_push($groupesVisibles, $record['id']);
    }
    $session->set('user-accessible_folders', $groupesVisibles);

    // get complete list of ROLES
    $tmp = explode(';', $idFonctions);
    $rows = DB::query(
        'SELECT * FROM ' . prefixTable('roles_title') . '
        ORDER BY title ASC'
    );
    foreach ($rows as $record) {
        if (! empty($record['id']) && ! in_array($record['id'], $tmp)) {
            array_push($tmp, $record['id']);
        }
    }
    $session->set('user-roles', implode(';', $tmp));
    $session->set('user-admin', 1);
    // Check if admin has created Folders and Roles
    DB::query('SELECT * FROM ' . prefixTable('nested_tree') . '');
    $session->set('user-nb_folders', DB::count());
    DB::query('SELECT * FROM ' . prefixTable('roles_title'));
    $session->set('user-nb_roles', DB::count());

    return true;
}

/**
 * Permits to convert an element to array.
 *
 * @param string|array $element Any value to be returned as array
 *
 * @return array
 */
function convertToArray($element): ?array
{
    if (is_string($element) === true) {
        if (empty($element) === true) {
            return [];
        }
        return explode(
            ';',
            trimElement($element, ';')
        );
    }
    return $element;
}

/**
 * Defines the rights the user has.
 *
 * @param string|array $allowedFolders  Allowed folders
 * @param string|array $noAccessFolders Not allowed folders
 * @param string|array $userRoles       Roles of user
 * @param array        $SETTINGS        Teampass settings
 * @param object       $tree            Tree of folders
 * 
 * @return bool
 */
function identUser(
    $allowedFolders,
    $noAccessFolders,
    $userRoles,
    array $SETTINGS,
    object $tree
) {
    $session = SessionManager::getSession();
    // Init
    $session->set('user-accessible_folders', []);
    $session->set('user-personal_folders', []);
    $session->set('user-no_access_folders', []);
    $session->set('user-personal_visible_folders', []);
    $session->set('user-read_only_folders', []);
    $session->set('user-user-roles', $userRoles);
    $session->set('user-admin', 0);
    // init
    $personalFolders = [];
    $readOnlyFolders = [];
    $noAccessPersonalFolders = [];
    $restrictedFoldersForItems = [];
    $foldersLimited = [];
    $foldersLimitedFull = [];
    $allowedFoldersByRoles = [];
    $globalsUserId = $session->get('user-id');
    $globalsPersonalFolders = $session->get('user-personal_folder_enabled');
    // Ensure consistency in array format
    $noAccessFolders = convertToArray($noAccessFolders);
    $userRoles = convertToArray($userRoles);
    $allowedFolders = convertToArray($allowedFolders);
    $session->set('user-allowed_folders_by_definition', $allowedFolders);
    
    // Get list of folders depending on Roles
    $arrays = identUserGetFoldersFromRoles(
        $userRoles,
        $allowedFoldersByRoles,
        $readOnlyFolders,
        $allowedFolders
    );
    $allowedFoldersByRoles = $arrays['allowedFoldersByRoles'];
    $readOnlyFolders = $arrays['readOnlyFolders'];

    // Does this user is allowed to see other items
    $inc = 0;
    $rows = DB::query(
        'SELECT id, id_tree FROM ' . prefixTable('items') . '
            WHERE restricted_to LIKE %ss AND inactif = %s'.
            (count($allowedFolders) > 0 ? ' AND id_tree NOT IN ('.implode(',', $allowedFolders).')' : ''),
        $globalsUserId,
        '0'
    );
    foreach ($rows as $record) {
        // Exclude restriction on item if folder is fully accessible
        //if (in_array($record['id_tree'], $allowedFolders) === false) {
            $restrictedFoldersForItems[$record['id_tree']][$inc] = $record['id'];
            ++$inc;
        //}
    }

    // Check for the users roles if some specific rights exist on items
    $rows = DB::query(
        'SELECT i.id_tree, r.item_id
        FROM ' . prefixTable('items') . ' as i
        INNER JOIN ' . prefixTable('restriction_to_roles') . ' as r ON (r.item_id=i.id)
        WHERE i.id_tree <> "" '.
        (count($userRoles) > 0 ? 'AND r.role_id IN %li ' : '').
        'ORDER BY i.id_tree ASC',
        $userRoles
    );
    $inc = 0;
    foreach ($rows as $record) {
        //if (isset($record['id_tree'])) {
            $foldersLimited[$record['id_tree']][$inc] = $record['item_id'];
            array_push($foldersLimitedFull, $record['id_tree']);
            ++$inc;
        //}
    }

    // Get list of Personal Folders
    $arrays = identUserGetPFList(
        $globalsPersonalFolders,
        $allowedFolders,
        $globalsUserId,
        $personalFolders,
        $noAccessPersonalFolders,
        $foldersLimitedFull,
        $allowedFoldersByRoles,
        array_keys($restrictedFoldersForItems),
        $readOnlyFolders,
        $noAccessFolders,
        isset($SETTINGS['enable_pf_feature']) === true ? $SETTINGS['enable_pf_feature'] : 0,
        $tree
    );
    $allowedFolders = $arrays['allowedFolders'];
    $personalFolders = $arrays['personalFolders'];
    $noAccessPersonalFolders = $arrays['noAccessPersonalFolders'];

    // Return data
    $session->set('user-accessible_folders', array_unique(array_merge($allowedFolders, $personalFolders), SORT_NUMERIC));
    $session->set('user-read_only_folders', $readOnlyFolders);
    $session->set('user-no_access_folders', $noAccessFolders);
    $session->set('user-personal_folders', $personalFolders);
    $session->set('user-list_folders_limited', $foldersLimited);
    $session->set('system-list_folders_editable_by_role', $allowedFoldersByRoles, 'SESSION');
    $session->set('system-list_restricted_folders_for_items', $restrictedFoldersForItems);
    $session->set('user-forbiden_personal_folders', $noAccessPersonalFolders);
    // Folders and Roles numbers
    DB::queryFirstRow('SELECT id FROM ' . prefixTable('nested_tree') . '');
    DB::queryFirstRow('SELECT id FROM ' . prefixTable('nested_tree') . '');
    $session->set('user-nb_folders', DB::count());
    DB::queryFirstRow('SELECT id FROM ' . prefixTable('roles_title'));
    DB::queryFirstRow('SELECT id FROM ' . prefixTable('roles_title'));
    $session->set('user-nb_roles', DB::count());
    // check if change proposals on User's items
    if (isset($SETTINGS['enable_suggestion']) === true && (int) $SETTINGS['enable_suggestion'] === 1) {
        $countNewItems = DB::query(
            'SELECT COUNT(*)
            FROM ' . prefixTable('items_change') . ' AS c
            LEFT JOIN ' . prefixTable('log_items') . ' AS i ON (c.item_id = i.id_item)
            WHERE i.action = %s AND i.id_user = %i',
            'at_creation',
            $globalsUserId
        );
        $session->set('user-nb_item_change_proposals', $countNewItems);
    } else {
        $session->set('user-nb_item_change_proposals', 0);
    }

    return true;
}

/**
 * Get list of folders depending on Roles
 * 
 * @param array $userRoles
 * @param array $allowedFoldersByRoles
 * @param array $readOnlyFolders
 * @param array $allowedFolders
 * 
 * @return array
 */
function identUserGetFoldersFromRoles(array $userRoles, array $allowedFoldersByRoles = [], array $readOnlyFolders = [], array $allowedFolders = []) : array
{
    $rows = DB::query(
        'SELECT *
        FROM ' . prefixTable('roles_values') . '
        WHERE type IN %ls'.(count($userRoles) > 0 ? ' AND role_id IN %li' : ''),
        ['W', 'ND', 'NE', 'NDNE', 'R'],
        $userRoles,
    );
    foreach ($rows as $record) {
        if ($record['type'] === 'R') {
            array_push($readOnlyFolders, $record['folder_id']);
        } elseif (in_array($record['folder_id'], $allowedFolders) === false) {
            array_push($allowedFoldersByRoles, $record['folder_id']);
        }
    }
    $allowedFoldersByRoles = array_unique($allowedFoldersByRoles);
    $readOnlyFolders = array_unique($readOnlyFolders);
    
    // Clean arrays
    foreach ($allowedFoldersByRoles as $value) {
        $key = array_search($value, $readOnlyFolders);
        if ($key !== false) {
            unset($readOnlyFolders[$key]);
        }
    }
    return [
        'readOnlyFolders' => $readOnlyFolders,
        'allowedFoldersByRoles' => $allowedFoldersByRoles
    ];
}

/**
 * Get list of Personal Folders
 * 
 * @param int $globalsPersonalFolders
 * @param array $allowedFolders
 * @param int $globalsUserId
 * @param array $personalFolders
 * @param array $noAccessPersonalFolders
 * @param array $foldersLimitedFull
 * @param array $allowedFoldersByRoles
 * @param array $restrictedFoldersForItems
 * @param array $readOnlyFolders
 * @param array $noAccessFolders
 * @param int $enablePfFeature
 * @param object $tree
 * 
 * @return array
 */
function identUserGetPFList(
    $globalsPersonalFolders,
    $allowedFolders,
    $globalsUserId,
    $personalFolders,
    $noAccessPersonalFolders,
    $foldersLimitedFull,
    $allowedFoldersByRoles,
    $restrictedFoldersForItems,
    $readOnlyFolders,
    $noAccessFolders,
    $enablePfFeature,
    $tree
)
{
    if (
        (int) $enablePfFeature === 1
        && (int) $globalsPersonalFolders === 1
    ) {
        $persoFld = DB::queryFirstRow(
            'SELECT id
            FROM ' . prefixTable('nested_tree') . '
            WHERE title = %s AND personal_folder = %i'.
            (count($allowedFolders) > 0 ? ' AND id NOT IN ('.implode(',', $allowedFolders).')' : ''),
            $globalsUserId,
            1
        );
        if (empty($persoFld['id']) === false) {
            array_push($personalFolders, $persoFld['id']);
            array_push($allowedFolders, $persoFld['id']);
            // get all descendants
            $ids = $tree->getDescendants($persoFld['id'], false, false, true);
            foreach ($ids as $id) {
                //array_push($allowedFolders, $id);
                array_push($personalFolders, $id);
            }
        }
    }
    
    // Exclude all other PF
    $where = new WhereClause('and');
    $where->add('personal_folder=%i', 1);
    if (count($personalFolders) > 0) {
        $where->add('id NOT IN ('.implode(',', $personalFolders).')');
    }
    if (
        (int) $enablePfFeature === 1
        && (int) $globalsPersonalFolders === 1
    ) {
        $where->add('title=%s', $globalsUserId);
        $where->negateLast();
    }
    $persoFlds = DB::query(
        'SELECT id
        FROM ' . prefixTable('nested_tree') . '
        WHERE %l',
        $where
    );
    foreach ($persoFlds as $persoFldId) {
        array_push($noAccessPersonalFolders, $persoFldId['id']);
    }

    // All folders visibles
    $allowedFolders = array_unique(array_merge(
        $allowedFolders,
        $foldersLimitedFull,
        $allowedFoldersByRoles,
        $restrictedFoldersForItems,
        $readOnlyFolders
    ), SORT_NUMERIC);
    // Exclude from allowed folders all the specific user forbidden folders
    if (count($noAccessFolders) > 0) {
        $allowedFolders = array_diff($allowedFolders, $noAccessFolders);
    }

    return [
        'allowedFolders' => array_diff(array_diff($allowedFolders, $noAccessPersonalFolders), $personalFolders),
        'personalFolders' => $personalFolders,
        'noAccessPersonalFolders' => $noAccessPersonalFolders
    ];
}


/**
 * Update the CACHE table.
 *
 * @param string $action   What to do
 * @param array  $SETTINGS Teampass settings
 * @param int    $ident    Ident format
 * 
 * @return void
 */
function updateCacheTable(string $action, ?int $ident = null): void
{
    if ($action === 'reload') {
        // Rebuild full cache table
        cacheTableRefresh();
    } elseif ($action === 'update_value' && is_null($ident) === false) {
        // UPDATE an item
        cacheTableUpdate($ident);
    } elseif ($action === 'add_value' && is_null($ident) === false) {
        // ADD an item
        cacheTableAdd($ident);
    } elseif ($action === 'delete_value' && is_null($ident) === false) {
        // DELETE an item
        DB::delete(prefixTable('cache'), 'id = %i', $ident);
    }
}

/**
 * Cache table - refresh.
 *
 * @return void
 */
function cacheTableRefresh(): void
{
    // Load class DB
    loadClasses('DB');

    //Load Tree
    $tree = new NestedTree(prefixTable('nested_tree'), 'id', 'parent_id', 'title');
    // truncate table
    DB::query('TRUNCATE TABLE ' . prefixTable('cache'));
    // reload date
    $rows = DB::query(
        'SELECT *
        FROM ' . prefixTable('items') . ' as i
        INNER JOIN ' . prefixTable('log_items') . ' as l ON (l.id_item = i.id)
        AND l.action = %s
        AND i.inactif = %i',
        'at_creation',
        0
    );
    foreach ($rows as $record) {
        if (empty($record['id_tree']) === false) {
            // Get all TAGS
            $tags = '';
            $itemTags = DB::query(
                'SELECT tag
                FROM ' . prefixTable('tags') . '
                WHERE item_id = %i AND tag != ""',
                $record['id']
            );
            foreach ($itemTags as $itemTag) {
                $tags .= $itemTag['tag'] . ' ';
            }

            // Get renewal period
            $resNT = DB::queryFirstRow(
                'SELECT renewal_period
                FROM ' . prefixTable('nested_tree') . '
                WHERE id = %i',
                $record['id_tree']
            );
            // form id_tree to full foldername
            $folder = [];
            $arbo = $tree->getPath($record['id_tree'], true);
            foreach ($arbo as $elem) {
                // Check if title is the ID of a user
                if (is_numeric($elem->title) === true) {
                    // Is this a User id?
                    $user = DB::queryFirstRow(
                        'SELECT id, login
                        FROM ' . prefixTable('users') . '
                        WHERE id = %i',
                        $elem->title
                    );
                    if (count($user) > 0) {
                        $elem->title = $user['login'];
                    }
                }
                // Build path
                array_push($folder, stripslashes($elem->title));
            }
            // store data
            DB::insert(
                prefixTable('cache'),
                [
                    'id' => $record['id'],
                    'label' => $record['label'],
                    'description' => $record['description'] ?? '',
                    'url' => isset($record['url']) && ! empty($record['url']) ? $record['url'] : '0',
                    'tags' => $tags,
                    'id_tree' => $record['id_tree'],
                    'perso' => $record['perso'],
                    'restricted_to' => isset($record['restricted_to']) && ! empty($record['restricted_to']) ? $record['restricted_to'] : '0',
                    'login' => $record['login'] ?? '',
                    'folder' => implode(' » ', $folder),
                    'author' => $record['id_user'],
                    'renewal_period' => $resNT['renewal_period'] ?? '0',
                    'timestamp' => $record['date'],
                ]
            );
        }
    }
}

/**
 * Cache table - update existing value.
 *
 * @param int    $ident    Ident format
 * 
 * @return void
 */
function cacheTableUpdate(?int $ident = null): void
{
    $session = SessionManager::getSession();
    loadClasses('DB');

    //Load Tree
    $tree = new NestedTree(prefixTable('nested_tree'), 'id', 'parent_id', 'title');
    // get new value from db
    $data = DB::queryFirstRow(
        'SELECT label, description, id_tree, perso, restricted_to, login, url
        FROM ' . prefixTable('items') . '
        WHERE id=%i',
        $ident
    );
    // Get all TAGS
    $tags = '';
    $itemTags = DB::query(
        'SELECT tag
            FROM ' . prefixTable('tags') . '
            WHERE item_id = %i AND tag != ""',
        $ident
    );
    foreach ($itemTags as $itemTag) {
        $tags .= $itemTag['tag'] . ' ';
    }
    // form id_tree to full foldername
    $folder = [];
    $arbo = $tree->getPath($data['id_tree'], true);
    foreach ($arbo as $elem) {
        // Check if title is the ID of a user
        if (is_numeric($elem->title) === true) {
            // Is this a User id?
            $user = DB::queryFirstRow(
                'SELECT id, login
                FROM ' . prefixTable('users') . '
                WHERE id = %i',
                $elem->title
            );
            if (count($user) > 0) {
                $elem->title = $user['login'];
            }
        }
        // Build path
        array_push($folder, stripslashes($elem->title));
    }
    // finaly update
    DB::update(
        prefixTable('cache'),
        [
            'label' => $data['label'],
            'description' => $data['description'],
            'tags' => $tags,
            'url' => isset($data['url']) && ! empty($data['url']) ? $data['url'] : '0',
            'id_tree' => $data['id_tree'],
            'perso' => $data['perso'],
            'restricted_to' => isset($data['restricted_to']) && ! empty($data['restricted_to']) ? $data['restricted_to'] : '0',
            'login' => $data['login'] ?? '',
            'folder' => implode(' » ', $folder),
            'author' => $session->get('user-id'),
        ],
        'id = %i',
        $ident
    );
}

/**
 * Cache table - add new value.
 *
 * @param int    $ident    Ident format
 * 
 * @return void
 */
function cacheTableAdd(?int $ident = null): void
{
    $session = SessionManager::getSession();
    $globalsUserId = $session->get('user-id');

    // Load class DB
    loadClasses('DB');

    //Load Tree
    $tree = new NestedTree(prefixTable('nested_tree'), 'id', 'parent_id', 'title');
    // get new value from db
    $data = DB::queryFirstRow(
        'SELECT i.label, i.description, i.id_tree as id_tree, i.perso, i.restricted_to, i.id, i.login, i.url, l.date
        FROM ' . prefixTable('items') . ' as i
        INNER JOIN ' . prefixTable('log_items') . ' as l ON (l.id_item = i.id)
        WHERE i.id = %i
        AND l.action = %s',
        $ident,
        'at_creation'
    );
    // Get all TAGS
    $tags = '';
    $itemTags = DB::query(
        'SELECT tag
            FROM ' . prefixTable('tags') . '
            WHERE item_id = %i AND tag != ""',
        $ident
    );
    foreach ($itemTags as $itemTag) {
        $tags .= $itemTag['tag'] . ' ';
    }
    // form id_tree to full foldername
    $folder = [];
    $arbo = $tree->getPath($data['id_tree'], true);
    foreach ($arbo as $elem) {
        // Check if title is the ID of a user
        if (is_numeric($elem->title) === true) {
            // Is this a User id?
            $user = DB::queryFirstRow(
                'SELECT id, login
                FROM ' . prefixTable('users') . '
                WHERE id = %i',
                $elem->title
            );
            if (count($user) > 0) {
                $elem->title = $user['login'];
            }
        }
        // Build path
        array_push($folder, stripslashes($elem->title));
    }
    // finaly update
    DB::insert(
        prefixTable('cache'),
        [
            'id' => $data['id'],
            'label' => $data['label'],
            'description' => $data['description'],
            'tags' => empty($tags) === false ? $tags : 'None',
            'url' => isset($data['url']) && ! empty($data['url']) ? $data['url'] : '0',
            'id_tree' => $data['id_tree'],
            'perso' => isset($data['perso']) && empty($data['perso']) === false && $data['perso'] !== 'None' ? $data['perso'] : '0',
            'restricted_to' => isset($data['restricted_to']) && empty($data['restricted_to']) === false ? $data['restricted_to'] : '0',
            'login' => $data['login'] ?? '',
            'folder' => implode(' » ', $folder),
            'author' => $globalsUserId,
            'timestamp' => $data['date'],
        ]
    );
}

/**
 * Do statistics.
 *
 * @param array $SETTINGS Teampass settings
 *
 * @return array
 */
function getStatisticsData(array $SETTINGS): array
{
    DB::query(
        'SELECT id FROM ' . prefixTable('nested_tree') . ' WHERE personal_folder = %i',
        0
    );
    $counter_folders = DB::count();
    DB::query(
        'SELECT id FROM ' . prefixTable('nested_tree') . ' WHERE personal_folder = %i',
        1
    );
    $counter_folders_perso = DB::count();
    DB::query(
        'SELECT id FROM ' . prefixTable('items') . ' WHERE perso = %i',
        0
    );
    $counter_items = DB::count();
        DB::query(
        'SELECT id FROM ' . prefixTable('items') . ' WHERE perso = %i',
        1
    );
    $counter_items_perso = DB::count();
        DB::query(
        'SELECT id FROM ' . prefixTable('users') . ' WHERE login NOT IN (%s, %s, %s)',
        'OTV', 'TP', 'API'
    );
    $counter_users = DB::count();
        DB::query(
        'SELECT id FROM ' . prefixTable('users') . ' WHERE admin = %i',
        1
    );
    $admins = DB::count();
    DB::query(
        'SELECT id FROM ' . prefixTable('users') . ' WHERE gestionnaire = %i',
        1
    );
    $managers = DB::count();
    DB::query(
        'SELECT id FROM ' . prefixTable('users') . ' WHERE read_only = %i',
        1
    );
    $readOnly = DB::count();
    // list the languages
    $usedLang = [];
    $tp_languages = DB::query(
        'SELECT name FROM ' . prefixTable('languages')
    );
    foreach ($tp_languages as $tp_language) {
        DB::query(
            'SELECT * FROM ' . prefixTable('users') . ' WHERE user_language = %s',
            $tp_language['name']
        );
        $usedLang[$tp_language['name']] = round((DB::count() * 100 / $counter_users), 0);
    }

    // get list of ips
    $usedIp = [];
    $tp_ips = DB::query(
        'SELECT user_ip FROM ' . prefixTable('users')
    );
    foreach ($tp_ips as $ip) {
        if (array_key_exists($ip['user_ip'], $usedIp)) {
            $usedIp[$ip['user_ip']] += $usedIp[$ip['user_ip']];
        } elseif (! empty($ip['user_ip']) && $ip['user_ip'] !== 'none') {
            $usedIp[$ip['user_ip']] = 1;
        }
    }

    return [
        'error' => '',
        'stat_phpversion' => phpversion(),
        'stat_folders' => $counter_folders,
        'stat_folders_shared' => intval($counter_folders) - intval($counter_folders_perso),
        'stat_items' => $counter_items,
        'stat_items_shared' => intval($counter_items) - intval($counter_items_perso),
        'stat_users' => $counter_users,
        'stat_admins' => $admins,
        'stat_managers' => $managers,
        'stat_ro' => $readOnly,
        'stat_kb' => $SETTINGS['enable_kb'],
        'stat_pf' => $SETTINGS['enable_pf_feature'],
        'stat_fav' => $SETTINGS['enable_favourites'],
        'stat_teampassversion' => TP_VERSION,
        'stat_ldap' => $SETTINGS['ldap_mode'],
        'stat_agses' => $SETTINGS['agses_authentication_enabled'],
        'stat_duo' => $SETTINGS['duo'],
        'stat_suggestion' => $SETTINGS['enable_suggestion'],
        'stat_api' => $SETTINGS['api'],
        'stat_customfields' => $SETTINGS['item_extra_fields'],
        'stat_syslog' => $SETTINGS['syslog_enable'],
        'stat_2fa' => $SETTINGS['google_authentication'],
        'stat_stricthttps' => $SETTINGS['enable_sts'],
        'stat_mysqlversion' => DB::serverVersion(),
        'stat_languages' => $usedLang,
        'stat_country' => $usedIp,
    ];
}

/**
 * Permits to prepare the way to send the email
 * 
 * @param string $subject       email subject
 * @param string $body          email message
 * @param string $email         email
 * @param string $receiverName  Receiver name
 * @param string $encryptedUserPassword      encryptedUserPassword
 *
 * @return void
 */
function prepareSendingEmail(
    $subject,
    $body,
    $email,
    $receiverName = '',
    $encryptedUserPassword = ''
): void 
{
    DB::insert(
        prefixTable('background_tasks'),
        array(
            'created_at' => time(),
            'process_type' => 'send_email',
            'arguments' => json_encode([
                'subject' => $subject,
                'receivers' => $email,
                'body' => $body,
                'receiver_name' => $receiverName,
                'encryptedUserPassword' => $encryptedUserPassword,
            ], JSON_HEX_QUOT | JSON_HEX_TAG),
        )
    );
}

/**
 * Returns the email body.
 *
 * @param string $textMail Text for the email
 */
function emailBody(string $textMail): string
{
    return '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.=
    w3.org/TR/html4/loose.dtd"><html>
    <head><title>Email Template</title>
    <style type="text/css">
    body { background-color: #f0f0f0; padding: 10px 0; margin:0 0 10px =0; }
    </style></head>
    <body style="-ms-text-size-adjust: none; size-adjust: none; margin: 0; padding: 10px 0; background-color: #f0f0f0;" bgcolor="#f0f0f0" leftmargin="0" topmargin="0" marginwidth="0" marginheight="0">
    <table border="0" width="100%" height="100%" cellpadding="0" cellspacing="0" bgcolor="#f0f0f0" style="border-spacing: 0;">
    <tr><td style="border-collapse: collapse;"><br>
        <table border="0" width="100%" cellpadding="0" cellspacing="0" bgcolor="#17357c" style="border-spacing: 0; margin-bottom: 25px;">
        <tr><td style="border-collapse: collapse; padding: 11px 20px;">
            <div style="max-width:150px; max-height:34px; color:#f0f0f0; font-weight:bold;">Teampass</div>
        </td></tr></table></td>
    </tr>
    <tr><td align="center" valign="top" bgcolor="#f0f0f0" style="border-collapse: collapse; background-color: #f0f0f0;">
        <table width="600" cellpadding="0" cellspacing="0" border="0" class="container" bgcolor="#ffffff" style="border-spacing: 0; border-bottom: 1px solid #e0e0e0; box-shadow: 0 0 3px #ddd; color: #434343; font-family: Helvetica, Verdana, sans-serif;">
        <tr><td class="container-padding" bgcolor="#ffffff" style="border-collapse: collapse; border-left: 1px solid #e0e0e0; background-color: #ffffff; padding-left: 30px; padding-right: 30px;">
        <br><div style="float:right;">' .
        $textMail .
        '<br><br></td></tr></table>
    </td></tr></table>
    <br></body></html>';
}

/**
 * Convert date to timestamp.
 *
 * @param string $date        The date
 * @param string $date_format Date format
 *
 * @return int
 */
function dateToStamp(string $date, string $date_format): int
{
    $date = date_parse_from_format($date_format, $date);
    if ((int) $date['warning_count'] === 0 && (int) $date['error_count'] === 0) {
        return mktime(
            empty($date['hour']) === false ? $date['hour'] : 23,
            empty($date['minute']) === false ? $date['minute'] : 59,
            empty($date['second']) === false ? $date['second'] : 59,
            $date['month'],
            $date['day'],
            $date['year']
        );
    }
    return 0;
}

/**
 * Is this a date.
 *
 * @param string $date Date
 *
 * @return bool
 */
function isDate(string $date): bool
{
    return strtotime($date) !== false;
}

/**
 * Check if isUTF8().
 *
 * @param string|array $string Is the string
 *
 * @return int is the string in UTF8 format
 */
function isUTF8($string): int
{
    if (is_array($string) === true) {
        $string = $string['string'];
    }

    return preg_match(
        '%^(?:
        [\x09\x0A\x0D\x20-\x7E] # ASCII
        | [\xC2-\xDF][\x80-\xBF] # non-overlong 2-byte
        | \xE0[\xA0-\xBF][\x80-\xBF] # excluding overlongs
        | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2} # straight 3-byte
        | \xED[\x80-\x9F][\x80-\xBF] # excluding surrogates
        | \xF0[\x90-\xBF][\x80-\xBF]{2} # planes 1-3
        | [\xF1-\xF3][\x80-\xBF]{3} # planes 4-15
        | \xF4[\x80-\x8F][\x80-\xBF]{2} # plane 16
        )*$%xs',
        $string
    );
}

/**
 * Prepare an array to UTF8 format before JSON_encode.
 *
 * @param array $array Array of values
 *
 * @return array
 */
function utf8Converter(array $array): array
{
    array_walk_recursive(
        $array,
        static function (&$item): void {
            if (mb_detect_encoding((string) $item, 'utf-8', true) === false) {
                $item = mb_convert_encoding($item, 'ISO-8859-1', 'UTF-8');
            }
        }
    );
    return $array;
}

/**
 * Permits to prepare data to be exchanged.
 *
 * @param array|string $data Text
 * @param string       $type Parameter
 * @param string       $key  Optional key
 *
 * @return string|array
 */
function prepareExchangedData($data, string $type, ?string $key = null)
{
    $session = SessionManager::getSession();
    $key = empty($key) ? $session->get('key') : $key;
    
    // Perform
    if ($type === 'encode' && is_array($data) === true) {
        // json encoding
        $data = json_encode(
            $data,
            JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP
        );
        
        // Now encrypt
        if ((int) $session->get('encryptClientServer') === 1) {
            $data = Encryption::encrypt(
                $data,
                $key
            );
        }

        return $data;
    }

    if ($type === 'decode' && is_array($data) === false) {
        // Decrypt if needed
        if ((int) $session->get('encryptClientServer') === 1) {
            $data = (string) Encryption::decrypt(
                (string) $data,
                $key
            );
        } else {
            // Double html encoding received
            $data = html_entity_decode(html_entity_decode(/** @scrutinizer ignore-type */$data)); // @codeCoverageIgnore Is always a string (not an array)
        }

        // Check if $data is a valid string before json_decode
        if (is_string($data) && !empty($data)) {
            // Return data array
            return json_decode($data, true);
        }
    }

    return '';
}


/**
 * Create a thumbnail.
 *
 * @param string  $src           Source
 * @param string  $dest          Destination
 * @param int $desired_width Size of width
 * 
 * @return void|string|bool
 */
function makeThumbnail(string $src, string $dest, int $desired_width)
{
    /* read the source image */
    if (is_file($src) === true && mime_content_type($src) === 'image/png') {
        $source_image = imagecreatefrompng($src);
        if ($source_image === false) {
            return "Error: Not a valid PNG file! It's type is ".mime_content_type($src);
        }
    } else {
        return "Error: Not a valid PNG file! It's type is ".mime_content_type($src);
    }

    // Get height and width
    $width = imagesx($source_image);
    $height = imagesy($source_image);
    /* find the "desired height" of this thumbnail, relative to the desired width  */
    $desired_height = (int) floor($height * $desired_width / $width);
    /* create a new, "virtual" image */
    $virtual_image = imagecreatetruecolor($desired_width, $desired_height);
    if ($virtual_image === false) {
        return false;
    }
    /* copy source image at a resized size */
    imagecopyresampled($virtual_image, $source_image, 0, 0, 0, 0, $desired_width, $desired_height, $width, $height);
    /* create the physical thumbnail image to its destination */
    imagejpeg($virtual_image, $dest);
}

/**
 * Check table prefix in SQL query.
 *
 * @param string $table Table name
 * 
 * @return string
 */
function prefixTable(string $table): string
{
    $safeTable = htmlspecialchars(DB_PREFIX . $table);
    return $safeTable;
}

/**
 * GenerateCryptKey
 *
 * @param int     $size      Length
 * @param bool $secure Secure
 * @param bool $numerals Numerics
 * @param bool $uppercase Uppercase letters
 * @param bool $symbols Symbols
 * @param bool $lowercase Lowercase
 * 
 * @return string
 */
function GenerateCryptKey(
    int $size = 20,
    bool $secure = false,
    bool $numerals = false,
    bool $uppercase = false,
    bool $symbols = false,
    bool $lowercase = false
): string {
    $generator = new ComputerPasswordGenerator();
    $generator->setRandomGenerator(new Php7RandomGenerator());
    
    // Manage size
    $generator->setLength((int) $size);
    if ($secure === true) {
        $generator->setSymbols(true);
        $generator->setLowercase(true);
        $generator->setUppercase(true);
        $generator->setNumbers(true);
    } else {
        $generator->setLowercase($lowercase);
        $generator->setUppercase($uppercase);
        $generator->setNumbers($numerals);
        $generator->setSymbols($symbols);
    }

    return $generator->generatePasswords()[0];
}

/**
 * GenerateGenericPassword
 *
 * @param int     $size      Length
 * @param bool $secure Secure
 * @param bool $numerals Numerics
 * @param bool $uppercase Uppercase letters
 * @param bool $symbols Symbols
 * @param bool $lowercase Lowercase
 * @param array   $SETTINGS  SETTINGS
 * 
 * @return string
 */
function generateGenericPassword(
    int $size,
    bool $secure,
    bool $lowercase,
    bool $capitalize,
    bool $numerals,
    bool $symbols,
    array $SETTINGS
): string
{
    if ((int) $size > (int) $SETTINGS['pwd_maximum_length']) {
        return prepareExchangedData(
            array(
                'error_msg' => 'Password length is too long! ',
                'error' => 'true',
            ),
            'encode'
        );
    }
    // Load libraries
    $generator = new ComputerPasswordGenerator();
    $generator->setRandomGenerator(new Php7RandomGenerator());

    // Manage size
    $generator->setLength(($size <= 0) ? 10 : $size);

    if ($secure === true) {
        $generator->setSymbols(true);
        $generator->setLowercase(true);
        $generator->setUppercase(true);
        $generator->setNumbers(true);
    } else {
        $generator->setLowercase($lowercase);
        $generator->setUppercase($capitalize);
        $generator->setNumbers($numerals);
        $generator->setSymbols($symbols);
    }

    return prepareExchangedData(
        array(
            'key' => $generator->generatePasswords(),
            'error' => '',
        ),
        'encode'
    );
}

/**
 * Send sysLOG message
 *
 * @param string    $message
 * @param string    $host
 * @param int       $port
 * @param string    $component
 * 
 * @return void
*/
function send_syslog($message, $host, $port, $component = 'teampass'): void
{
    $sock = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
    $syslog_message = '<123>' . date('M d H:i:s ') . $component . ': ' . $message;
    socket_sendto($sock, (string) $syslog_message, strlen($syslog_message), 0, (string) $host, (int) $port);
    socket_close($sock);
}

/**
 * Permits to log events into DB
 *
 * @param array  $SETTINGS Teampass settings
 * @param string $type     Type
 * @param string $label    Label
 * @param string $who      Who
 * @param string $login    Login
 * @param string|int $field_1  Field
 * 
 * @return void
 */
function logEvents(
    array $SETTINGS, 
    string $type, 
    string $label, 
    string $who, 
    ?string $login = null, 
    $field_1 = null
): void
{
    if (empty($who)) {
        $who = getClientIpServer();
    }

    // Load class DB
    loadClasses('DB');

    DB::insert(
        prefixTable('log_system'),
        [
            'type' => $type,
            'date' => time(),
            'label' => $label,
            'qui' => $who,
            'field_1' => $field_1 === null ? '' : $field_1,
        ]
    );
    // If SYSLOG
    if (isset($SETTINGS['syslog_enable']) === true && (int) $SETTINGS['syslog_enable'] === 1) {
        if ($type === 'user_mngt') {
            send_syslog(
                'action=' . str_replace('at_', '', $label) . ' attribute=user user=' . $who . ' userid="' . $login . '" change="' . $field_1 . '" ',
                $SETTINGS['syslog_host'],
                $SETTINGS['syslog_port'],
                'teampass'
            );
        } else {
            send_syslog(
                'action=' . $type . ' attribute=' . $label . ' user=' . $who . ' userid="' . $login . '" ',
                $SETTINGS['syslog_host'],
                $SETTINGS['syslog_port'],
                'teampass'
            );
        }
    }
}

/**
 * Log events.
 *
 * @param array  $SETTINGS        Teampass settings
 * @param int    $item_id         Item id
 * @param string $item_label      Item label
 * @param int    $id_user         User id
 * @param string $action          Code for reason
 * @param string $login           User login
 * @param string $raison          Code for reason
 * @param string $encryption_type Encryption on
 * @param string $time Encryption Time
 * @param string $old_value       Old value
 * 
 * @return void
 */
function logItems(
    array $SETTINGS,
    int $item_id,
    string $item_label,
    int $id_user,
    string $action,
    ?string $login = null,
    ?string $raison = null,
    ?string $encryption_type = null,
    ?string $time = null,
    ?string $old_value = null
): void {
    // Load class DB
    loadClasses('DB');

    // Insert log in DB
    DB::insert(
        prefixTable('log_items'),
        [
            'id_item' => $item_id,
            'date' => is_null($time) === true ? time() : $time,
            'id_user' => $id_user,
            'action' => $action,
            'raison' => $raison,
            'old_value' => $old_value,
            'encryption_type' => is_null($encryption_type) === true ? TP_ENCRYPTION_NAME : $encryption_type,
        ]
    );
    // Timestamp the last change
    if (in_array($action, ['at_creation', 'at_modifiation', 'at_delete', 'at_import'], true)) {
        DB::update(
            prefixTable('misc'),
            [
                'valeur' => time(),
                'updated_at' => time(),
            ],
            'type = %s AND intitule = %s',
            'timestamp',
            'last_item_change'
        );
    }

    // SYSLOG
    if (isset($SETTINGS['syslog_enable']) === true && (int) $SETTINGS['syslog_enable'] === 1) {
        // Extract reason
        $attribute = is_null($raison) === true ? Array('') : explode(' : ', $raison);
        // Get item info if not known
        if (empty($item_label) === true) {
            $dataItem = DB::queryFirstRow(
                'SELECT id, id_tree, label
                FROM ' . prefixTable('items') . '
                WHERE id = %i',
                $item_id
            );
            $item_label = $dataItem['label'];
        }

        send_syslog(
            'action=' . str_replace('at_', '', $action) .
                ' attribute=' . str_replace('at_', '', $attribute[0]) .
                ' itemno=' . $item_id .
                ' user=' . (is_null($login) === true ? '' : addslashes((string) $login)) .
                ' itemname="' . addslashes($item_label) . '"',
            $SETTINGS['syslog_host'],
            $SETTINGS['syslog_port'],
            'teampass'
        );
    }

    // send notification if enabled
    //notifyOnChange($item_id, $action, $SETTINGS);
}

/**
 * Prepare notification email to subscribers.
 *
 * @param int    $item_id  Item id
 * @param string $label    Item label
 * @param array  $changes  List of changes
 * @param array  $SETTINGS Teampass settings
 * 
 * @return void
 */
function notifyChangesToSubscribers(int $item_id, string $label, array $changes, array $SETTINGS): void
{
    $session = SessionManager::getSession();
    $lang = new Language($session->get('user-language') ?? 'english');
    $globalsUserId = $session->get('user-id');
    $globalsLastname = $session->get('user-lastname');
    $globalsName = $session->get('user-name');
    // send email to user that what to be notified
    $notification = DB::queryFirstField(
        'SELECT email
        FROM ' . prefixTable('notification') . ' AS n
        INNER JOIN ' . prefixTable('users') . ' AS u ON (n.user_id = u.id)
        WHERE n.item_id = %i AND n.user_id != %i',
        $item_id,
        $globalsUserId
    );
    if (DB::count() > 0) {
        // Prepare path
        $path = geItemReadablePath($item_id, '', $SETTINGS);
        // Get list of changes
        $htmlChanges = '<ul>';
        foreach ($changes as $change) {
            $htmlChanges .= '<li>' . $change . '</li>';
        }
        $htmlChanges .= '</ul>';
        // send email
        DB::insert(
            prefixTable('emails'),
            [
                'timestamp' => time(),
                'subject' => $lang->get('email_subject_item_updated'),
                'body' => str_replace(
                    ['#item_label#', '#folder_name#', '#item_id#', '#url#', '#name#', '#lastname#', '#changes#'],
                    [$label, $path, (string) $item_id, $SETTINGS['cpassman_url'], $globalsName, $globalsLastname, $htmlChanges],
                    $lang->get('email_body_item_updated')
                ),
                'receivers' => implode(',', $notification),
                'status' => '',
            ]
        );
    }
}

/**
 * Returns the Item + path.
 *
 * @param int    $id_tree  Node id
 * @param string $label    Label
 * @param array  $SETTINGS TP settings
 * 
 * @return string
 */
function geItemReadablePath(int $id_tree, string $label, array $SETTINGS): string
{
    $tree = new NestedTree(prefixTable('nested_tree'), 'id', 'parent_id', 'title');
    $arbo = $tree->getPath($id_tree, true);
    $path = '';
    foreach ($arbo as $elem) {
        if (empty($path) === true) {
            $path = htmlspecialchars(stripslashes(htmlspecialchars_decode($elem->title, ENT_QUOTES)), ENT_QUOTES) . ' ';
        } else {
            $path .= '&#8594; ' . htmlspecialchars(stripslashes(htmlspecialchars_decode($elem->title, ENT_QUOTES)), ENT_QUOTES);
        }
    }

    // Build text to show user
    if (empty($label) === false) {
        return empty($path) === true ? addslashes($label) : addslashes($label) . ' (' . $path . ')';
    }
    return empty($path) === true ? '' : $path;
}

/**
 * Get the client ip address.
 *
 * @return string IP address
 */
function getClientIpServer(): string
{
    if (getenv('HTTP_CLIENT_IP')) {
        $ipaddress = getenv('HTTP_CLIENT_IP');
    } elseif (getenv('HTTP_X_FORWARDED_FOR')) {
        $ipaddress = getenv('HTTP_X_FORWARDED_FOR');
    } elseif (getenv('HTTP_X_FORWARDED')) {
        $ipaddress = getenv('HTTP_X_FORWARDED');
    } elseif (getenv('HTTP_FORWARDED_FOR')) {
        $ipaddress = getenv('HTTP_FORWARDED_FOR');
    } elseif (getenv('HTTP_FORWARDED')) {
        $ipaddress = getenv('HTTP_FORWARDED');
    } elseif (getenv('REMOTE_ADDR')) {
        $ipaddress = getenv('REMOTE_ADDR');
    } else {
        $ipaddress = 'UNKNOWN';
    }

    return $ipaddress;
}

/**
 * Escape all HTML, JavaScript, and CSS.
 *
 * @param string $input    The input string
 * @param string $encoding Which character encoding are we using?
 * 
 * @return string
 */
function noHTML(string $input, string $encoding = 'UTF-8'): string
{
    return htmlspecialchars($input, ENT_QUOTES | ENT_XHTML, $encoding, false);
}

/**
 * Rebuilds the Teampass config file.
 *
 * @param string $configFilePath Path to the config file.
 * @param array  $settings       Teampass settings.
 *
 * @return string|bool
 */
function rebuildConfigFile(string $configFilePath, array $settings)
{
    // Perform a copy if the file exists
    if (file_exists($configFilePath)) {
        $backupFilePath = $configFilePath . '.' . date('Y_m_d_His', time());
        if (!copy($configFilePath, $backupFilePath)) {
            return "ERROR: Could not copy file '$configFilePath'";
        }
    }

    // Regenerate the config file
    $data = ["<?php\n", "global \$SETTINGS;\n", "\$SETTINGS = array (\n"];
    $rows = DB::query('SELECT * FROM ' . prefixTable('misc') . ' WHERE type=%s', 'admin');
    foreach ($rows as $record) {
        $value = getEncryptedValue($record['valeur'], $record['is_encrypted']);
        $data[] = "    '{$record['intitule']}' => '". htmlspecialchars_decode($value, ENT_COMPAT) . "',\n";
    }
    $data[] = ");\n";
    $data = array_unique($data);

    // Update the file
    file_put_contents($configFilePath, implode('', $data));

    return true;
}

/**
 * Returns the encrypted value if needed.
 *
 * @param string $value       Value to encrypt.
 * @param int   $isEncrypted Is the value encrypted?
 *
 * @return string
 */
function getEncryptedValue(string $value, int $isEncrypted): string
{
    return $isEncrypted ? cryption($value, '', 'encrypt')['string'] : $value;
}

/**
 * Permits to replace &#92; to permit correct display
 *
 * @param string $input Some text
 * 
 * @return string
 */
function handleBackslash(string $input): string
{
    return str_replace('&amp;#92;', '&#92;', $input);
}

/**
 * Permits to load settings
 * 
 * @return void
*/
function loadSettings(): void
{
    global $SETTINGS;
    /* LOAD CPASSMAN SETTINGS */
    if (! isset($SETTINGS['loaded']) || $SETTINGS['loaded'] !== 1) {
        $SETTINGS = [];
        $SETTINGS['duplicate_folder'] = 0;
        //by default, this is set to 0;
        $SETTINGS['duplicate_item'] = 0;
        //by default, this is set to 0;
        $SETTINGS['number_of_used_pw'] = 5;
        //by default, this value is set to 5;
        $settings = [];
        $rows = DB::query(
            'SELECT * FROM ' . prefixTable('misc') . ' WHERE type=%s_type OR type=%s_type2',
            [
                'type' => 'admin',
                'type2' => 'settings',
            ]
        );
        foreach ($rows as $record) {
            if ($record['type'] === 'admin') {
                $SETTINGS[$record['intitule']] = $record['valeur'];
            } else {
                $settings[$record['intitule']] = $record['valeur'];
            }
        }
        $SETTINGS['loaded'] = 1;
        $SETTINGS['default_session_expiration_time'] = 5;
    }
}

/**
 * check if folder has custom fields.
 * Ensure that target one also has same custom fields
 * 
 * @param int $source_id
 * @param int $target_id 
 * 
 * @return bool
*/
function checkCFconsistency(int $source_id, int $target_id): bool
{
    $source_cf = [];
    $rows = DB::query(
        'SELECT id_category
            FROM ' . prefixTable('categories_folders') . '
            WHERE id_folder = %i',
        $source_id
    );
    foreach ($rows as $record) {
        array_push($source_cf, $record['id_category']);
    }

    $target_cf = [];
    $rows = DB::query(
        'SELECT id_category
            FROM ' . prefixTable('categories_folders') . '
            WHERE id_folder = %i',
        $target_id
    );
    foreach ($rows as $record) {
        array_push($target_cf, $record['id_category']);
    }

    $cf_diff = array_diff($source_cf, $target_cf);
    if (count($cf_diff) > 0) {
        return false;
    }

    return true;
}

/**
 * Will encrypte/decrypt a fil eusing Defuse.
 *
 * @param string $type        can be either encrypt or decrypt
 * @param string $source_file path to source file
 * @param string $target_file path to target file
 * @param array  $SETTINGS    Settings
 * @param string $password    A password
 *
 * @return string|bool
 */
function prepareFileWithDefuse(
    string $type,
    string $source_file,
    string $target_file,
    ?string $password = null
) {
    // Load AntiXSS
    $antiXss = new AntiXSS();
    // Protect against bad inputs
    if (is_array($source_file) === true || is_array($target_file) === true) {
        return 'error_cannot_be_array';
    }

    // Sanitize
    $source_file = $antiXss->xss_clean($source_file);
    $target_file = $antiXss->xss_clean($target_file);
    if (empty($password) === true || is_null($password) === true) {
        // get KEY to define password
        $ascii_key = file_get_contents(SECUREPATH.'/'.SECUREFILE);
        $password = Key::loadFromAsciiSafeString($ascii_key);
    }

    $err = '';
    if ($type === 'decrypt') {
        // Decrypt file
        $err = defuseFileDecrypt(
            $source_file,
            $target_file,
            $password
        );
    } elseif ($type === 'encrypt') {
        // Encrypt file
        $err = defuseFileEncrypt(
            $source_file,
            $target_file,
            $password
        );
    }

    // return error
    return $err === true ? $err : '';
}

/**
 * Encrypt a file with Defuse.
 *
 * @param string $source_file path to source file
 * @param string $target_file path to target file
 * @param array  $SETTINGS    Settings
 * @param string $password    A password
 *
 * @return string|bool
 */
function defuseFileEncrypt(
    string $source_file,
    string $target_file,
    ?string $password = null
) {
    $err = '';
    try {
        CryptoFile::encryptFileWithPassword(
            $source_file,
            $target_file,
            $password
        );
    } catch (CryptoException\WrongKeyOrModifiedCiphertextException $ex) {
        $err = 'wrong_key';
    } catch (CryptoException\EnvironmentIsBrokenException $ex) {
        error_log('TEAMPASS-Error-Environment: ' . $ex->getMessage());
        $err = 'environment_error';
    } catch (CryptoException\IOException $ex) {
        error_log('TEAMPASS-Error-General: ' . $ex->getMessage());
        $err = 'general_error';
    }

    // return error
    return empty($err) === false ? $err : true;
}

/**
 * Decrypt a file with Defuse.
 *
 * @param string $source_file path to source file
 * @param string $target_file path to target file
 * @param string $password    A password
 *
 * @return string|bool
 */
function defuseFileDecrypt(
    string $source_file,
    string $target_file,
    ?string $password = null
) {
    $err = '';
    try {
        CryptoFile::decryptFileWithPassword(
            $source_file,
            $target_file,
            $password
        );
    } catch (CryptoException\WrongKeyOrModifiedCiphertextException $ex) {
        $err = 'wrong_key';
    } catch (CryptoException\EnvironmentIsBrokenException $ex) {
        error_log('TEAMPASS-Error-Environment: ' . $ex->getMessage());
        $err = 'environment_error';
    } catch (CryptoException\IOException $ex) {
        error_log('TEAMPASS-Error-General: ' . $ex->getMessage());
        $err = 'general_error';
    }

    // return error
    return empty($err) === false ? $err : true;
}

/*
* NOT TO BE USED
*/
/**
 * Undocumented function.
 *
 * @param string $text Text to debug
 */
function debugTeampass(string $text): void
{
    $debugFile = fopen('D:/wamp64/www/TeamPass/debug.txt', 'r+');
    if ($debugFile !== false) {
        fputs($debugFile, $text);
        fclose($debugFile);
    }
}

/**
 * DELETE the file with expected command depending on server type.
 *
 * @param string $file     Path to file
 * @param array  $SETTINGS Teampass settings
 *
 * @return void
 */
function fileDelete(string $file, array $SETTINGS): void
{
    // Load AntiXSS
    $antiXss = new AntiXSS();
    $file = $antiXss->xss_clean($file);
    if (is_file($file)) {
        unlink($file);
    }
}

/**
 * Permits to extract the file extension.
 *
 * @param string $file File name
 *
 * @return string
 */
function getFileExtension(string $file): string
{
    if (strpos($file, '.') === false) {
        return $file;
    }

    return substr($file, strrpos($file, '.') + 1);
}

/**
 * Chmods files and folders with different permissions.
 *
 * This is an all-PHP alternative to using: \n
 * <tt>exec("find ".$path." -type f -exec chmod 644 {} \;");</tt> \n
 * <tt>exec("find ".$path." -type d -exec chmod 755 {} \;");</tt>
 *
 * @author Jeppe Toustrup (tenzer at tenzer dot dk)
  *
 * @param string $path      An either relative or absolute path to a file or directory which should be processed.
 * @param int    $filePerm The permissions any found files should get.
 * @param int    $dirPerm  The permissions any found folder should get.
 *
 * @return bool Returns TRUE if the path if found and FALSE if not.
 *
 * @warning The permission levels has to be entered in octal format, which
 * normally means adding a zero ("0") in front of the permission level. \n
 * More info at: http://php.net/chmod.
*/

function recursiveChmod(
    string $path,
    int $filePerm = 0644,
    int  $dirPerm = 0755
) {
    // Check if the path exists
    $path = basename($path);
    if (! file_exists($path)) {
        return false;
    }

    // See whether this is a file
    if (is_file($path)) {
        // Chmod the file with our given filepermissions
        try {
            chmod($path, $filePerm);
        } catch (Exception $e) {
            return false;
        }
    // If this is a directory...
    } elseif (is_dir($path)) {
        // Then get an array of the contents
        $foldersAndFiles = scandir($path);
        // Remove "." and ".." from the list
        $entries = array_slice($foldersAndFiles, 2);
        // Parse every result...
        foreach ($entries as $entry) {
            // And call this function again recursively, with the same permissions
            recursiveChmod($path.'/'.$entry, $filePerm, $dirPerm);
        }

        // When we are done with the contents of the directory, we chmod the directory itself
        try {
            chmod($path, $filePerm);
        } catch (Exception $e) {
            return false;
        }
    }

    // Everything seemed to work out well, return true
    return true;
}

/**
 * Check if user can access to this item.
 *
 * @param int   $item_id ID of item
 * @param array $SETTINGS
 *
 * @return bool|string
 */
function accessToItemIsGranted(int $item_id, array $SETTINGS)
{
    
    $session = SessionManager::getSession();
    $session_groupes_visibles = $session->get('user-accessible_folders');
    $session_list_restricted_folders_for_items = $session->get('system-list_restricted_folders_for_items');
    // Load item data
    $data = DB::queryFirstRow(
        'SELECT id_tree
        FROM ' . prefixTable('items') . '
        WHERE id = %i',
        $item_id
    );
    // Check if user can access this folder
    if (in_array($data['id_tree'], $session_groupes_visibles) === false) {
        // Now check if this folder is restricted to user
        if (isset($session_list_restricted_folders_for_items[$data['id_tree']]) === true
            && in_array($item_id, $session_list_restricted_folders_for_items[$data['id_tree']]) === false
        ) {
            return 'ERR_FOLDER_NOT_ALLOWED';
        }
    }

    return true;
}

/**
 * Creates a unique key.
 *
 * @param int $lenght Key lenght
 *
 * @return string
 */
function uniqidReal(int $lenght = 13): string
{
    if (function_exists('random_bytes')) {
        $bytes = random_bytes(intval(ceil($lenght / 2)));
    } elseif (function_exists('openssl_random_pseudo_bytes')) {
        $bytes = openssl_random_pseudo_bytes(intval(ceil($lenght / 2)));
    } else {
        throw new Exception('no cryptographically secure random function available');
    }

    return substr(bin2hex($bytes), 0, $lenght);
}

/**
 * Obfuscate an email.
 *
 * @param string $email Email address
 *
 * @return string
 */
function obfuscateEmail(string $email): string
{
    $email = explode("@", $email);
    $name = $email[0];
    if (strlen($name) > 3) {
        $name = substr($name, 0, 2);
        for ($i = 0; $i < strlen($email[0]) - 3; $i++) {
            $name .= "*";
        }
        $name .= substr($email[0], -1, 1);
    }
    $host = explode(".", $email[1])[0];
    if (strlen($host) > 3) {
        $host = substr($host, 0, 1);
        for ($i = 0; $i < strlen(explode(".", $email[1])[0]) - 2; $i++) {
            $host .= "*";
        }
        $host .= substr(explode(".", $email[1])[0], -1, 1);
    }
    $email = $name . "@" . $host . "." . explode(".", $email[1])[1];
    return $email;
}

/**
 * Get id and title from role_titles table.
 *
 * @return array
 */
function getRolesTitles(): array
{
    // Load class DB
    loadClasses('DB');
    
    // Insert log in DB
    return DB::query(
        'SELECT id, title
        FROM ' . prefixTable('roles_title')
    );
}

/**
 * Undocumented function.
 *
 * @param int $bytes Size of file
 *
 * @return string
 */
function formatSizeUnits(int $bytes): string
{
    if ($bytes >= 1073741824) {
        $bytes = number_format($bytes / 1073741824, 2) . ' GB';
    } elseif ($bytes >= 1048576) {
        $bytes = number_format($bytes / 1048576, 2) . ' MB';
    } elseif ($bytes >= 1024) {
        $bytes = number_format($bytes / 1024, 2) . ' KB';
    } elseif ($bytes > 1) {
        $bytes .= ' bytes';
    } elseif ($bytes === 1) {
        $bytes .= ' byte';
    } else {
        $bytes = '0 bytes';
    }

    return $bytes;
}

/**
 * Generate user pair of keys.
 *
 * @param string $userPwd User password
 *
 * @return array
 */
function generateUserKeys(string $userPwd, ?array $SETTINGS = null): array
{
    // Sanitize
    $antiXss = new AntiXSS();
    $userPwd = $antiXss->xss_clean($userPwd);
    // Load classes
    $rsa = new Crypt_RSA();
    $cipher = new Crypt_AES();
    // Create the private and public key
    $res = $rsa->createKey(4096);
    // Encrypt the privatekey
    $cipher->setPassword($userPwd);
    $privatekey = $cipher->encrypt($res['privatekey']);

    $result = [
        'private_key' => base64_encode($privatekey),
        'public_key' => base64_encode($res['publickey']),
        'private_key_clear' => base64_encode($res['privatekey']),
    ];

    // Generate transparent recovery data if enabled
    if ($SETTINGS !== null) {
        // Generate unique seed for this user
        $userSeed = bin2hex(openssl_random_pseudo_bytes(32));

        // Derive backup encryption key
        $derivedKey = deriveBackupKey($userSeed, $result['public_key'], $SETTINGS);

        // Encrypt private key with derived key (backup)
        $cipherBackup = new Crypt_AES();
        $cipherBackup->setPassword($derivedKey);
        $privatekeyBackup = $cipherBackup->encrypt($res['privatekey']);

        // Generate integrity hash
        $integrityHash = null;

The assignment to $integrityHash is dead and can be removed.

        $serverSecret = getServerSecret();
        $integrityHash = generateKeyIntegrityHash($userSeed, $result['public_key'], $serverSecret);

        $result['user_seed'] = $userSeed;
        $result['private_key_backup'] = base64_encode($privatekeyBackup);
        $result['key_integrity_hash'] = $integrityHash;
    }

    return $result;
}

/**
 * Permits to decrypt the user's privatekey.
 *
 * @param string $userPwd        User password
 * @param string $userPrivateKey User private key
 *
 * @return string|object
 */
function decryptPrivateKey(string $userPwd, string $userPrivateKey)
{
    // Sanitize
    $antiXss = new AntiXSS();
    $userPwd = $antiXss->xss_clean($userPwd);
    $userPrivateKey = $antiXss->xss_clean($userPrivateKey);

    if (empty($userPwd) === false) {
        // Load classes
        $cipher = new Crypt_AES();
        // Encrypt the privatekey
        $cipher->setPassword($userPwd);
        try {
            return base64_encode((string) $cipher->decrypt(base64_decode($userPrivateKey)));
        } catch (Exception $e) {
            return $e;
        }
    }
    return '';
}

/**
 * Permits to encrypt the user's privatekey.
 *
 * @param string $userPwd        User password
 * @param string $userPrivateKey User private key
 *
 * @return string
 */
function encryptPrivateKey(string $userPwd, string $userPrivateKey): string
{
    // Sanitize
    $antiXss = new AntiXSS();
    $userPwd = $antiXss->xss_clean($userPwd);
    $userPrivateKey = $antiXss->xss_clean($userPrivateKey);

    if (empty($userPwd) === false) {
        // Load classes
        $cipher = new Crypt_AES();
        // Encrypt the privatekey
        $cipher->setPassword($userPwd);        
        try {
            return base64_encode($cipher->encrypt(base64_decode($userPrivateKey)));
        } catch (Exception $e) {
            return $e->getMessage();
        }
    }
    return '';
}

/**
 * Derives a backup encryption key from user seed and public key.
 * Uses PBKDF2 with 100k iterations for strong key derivation.
 *
 * @param string $userSeed User's unique derivation seed (64 hex chars)
 * @param string $publicKey User's public RSA key (base64 encoded)
 * @param array $SETTINGS Teampass settings
 *
 * @return string Derived key (32 bytes, raw binary)
 */
function deriveBackupKey(string $userSeed, string $publicKey, array $SETTINGS): string
{
    // Sanitize inputs
    $antiXss = new AntiXSS();
    $userSeed = $antiXss->xss_clean($userSeed);
    $publicKey = $antiXss->xss_clean($publicKey);

    // Use public key hash as salt for key derivation
    $salt = hash('sha256', $publicKey, true);

    // Get PBKDF2 iterations from settings (default 100000)
    $iterations = isset($SETTINGS['transparent_key_recovery_pbkdf2_iterations'])
        ? (int) $SETTINGS['transparent_key_recovery_pbkdf2_iterations']
        : 100000;

    // PBKDF2 key derivation with SHA256
    return hash_pbkdf2(
        'sha256',
        hex2bin($userSeed),
        $salt,
        $iterations,
        32, // 256 bits key length
        true // raw binary output
    );
}

/**
 * Generates key integrity hash to detect tampering.
 *
 * @param string $userSeed User derivation seed
 * @param string $publicKey User public key
 * @param string $serverSecret Server-wide secret key
 *
 * @return string HMAC hash (64 hex chars)
 */
function generateKeyIntegrityHash(string $userSeed, string $publicKey, string $serverSecret): string
{
    return hash_hmac('sha256', $userSeed . $publicKey, $serverSecret);
}

/**
 * Verifies key integrity to detect SQL injection or tampering.
 *
 * @param array $userInfo User information from database
 * @param string $serverSecret Server-wide secret key
 *
 * @return bool True if integrity is valid
 */
function verifyKeyIntegrity(array $userInfo, string $serverSecret): bool
{
    // Skip check if no integrity hash stored (legacy users)
    if (empty($userInfo['key_integrity_hash'])) {
        return true;
    }

    if (empty($userInfo['user_derivation_seed']) || empty($userInfo['public_key'])) {
        return false;
    }

    $expectedHash = generateKeyIntegrityHash(
        $userInfo['user_derivation_seed'],
        $userInfo['public_key'],
        $serverSecret
    );

    return hash_equals($expectedHash, $userInfo['key_integrity_hash']);
}

/**
 * Gets server secret for integrity checks.
 * Reads from file or generates if not exists.
 * *
 * @return string Server secret key
 */
function getServerSecret(): string
{
    $ascii_key = file_get_contents(SECUREPATH.'/'.SECUREFILE);
    $key = Key::loadFromAsciiSafeString($ascii_key);
    return $key->saveToAsciiSafeString();
}

/**
 * Attempts transparent recovery when password change is detected.
 *
 * @param array $userInfo User information from database
 * @param string $newPassword New password (clear)
 * @param array $SETTINGS Teampass settings
 *
 * @return array Result with private key or error
 */
function attemptTransparentRecovery(array $userInfo, string $newPassword, array $SETTINGS): array
{
    $session = SessionManager::getSession();
    try {
        // Check if user has recovery data
        if (empty($userInfo['user_derivation_seed']) || empty($userInfo['private_key_backup'])) {
            return [
                'success' => false,
                'error' => 'no_recovery_data',
                'private_key_clear' => '',
            ];
        }

        // Verify key integrity
        $serverSecret = getServerSecret();
        if (!verifyKeyIntegrity($userInfo, $serverSecret)) {
            // Critical security event - integrity check failed
            logEvents(
                $SETTINGS,
                'security_alert',
                'key_integrity_check_failed',
                (string) $userInfo['id'],
                'User: ' . $userInfo['login']
            );
            return [
                'success' => false,
                'error' => 'integrity_check_failed',
                'private_key_clear' => '',
            ];
        }

        // Derive backup key
        $derivedKey = deriveBackupKey(
            $userInfo['user_derivation_seed'],
            $userInfo['public_key'],
            $SETTINGS
        );

        // Decrypt private key using derived key
        $cipher = new Crypt_AES();
        $cipher->setPassword($derivedKey);
        $privateKeyClear = base64_encode($cipher->decrypt(base64_decode($userInfo['private_key_backup'])));

        // Re-encrypt with new password
        $newPrivateKeyEncrypted = encryptPrivateKey($newPassword, $privateKeyClear);

        // Re-encrypt backup with derived key (refresh)
        $cipher->setPassword($derivedKey);
        $newPrivateKeyBackup = base64_encode($cipher->encrypt(base64_decode($privateKeyClear)));
        
        // Update database
        DB::update(
            prefixTable('users'),
            [
                'private_key' => $newPrivateKeyEncrypted,
                'private_key_backup' => $newPrivateKeyBackup,
                'last_pw_change' => time(),
                'special' => 'none',
            ],
            'id = %i',
            $userInfo['id']
        );

        // Log success
        logEvents(
            $SETTINGS,
            'user_connection',
            'auto_reencryption_success',
            (string) $userInfo['id'],
            'User: ' . $userInfo['login']
        );

        // Store in session for immediate use
        $session->set('user-private_key', $privateKeyClear);
        $session->set('user-private_key_recovered', true);

        return [
            'success' => true,
            'error' => '',
        ];

    } catch (Exception $e) {
        // Log failure
        logEvents(
            $SETTINGS,
            'security_alert',
            'auto_reencryption_failed',
            (string) $userInfo['id'],
            'User: ' . $userInfo['login'] . ' - Error: ' . $e->getMessage()
        );

        return [
            'success' => false,
            'error' => 'decryption_failed: ' . $e->getMessage(),
            'private_key_clear' => '',
        ];
    }
}

/**
 * Handles external password change (LDAP/OAuth2) with automatic re-encryption.
 *
 * @param int $userId User ID
 * @param string $newPassword New password (clear)
 * @param array $userInfo User information from database
 * @param array $SETTINGS Teampass settings
 *
 * @return bool True if  handled successfully
 */
function handleExternalPasswordChange(int $userId, string $newPassword, array $userInfo, array $SETTINGS): bool
{
    // Check if password was changed recently (< 30s) to avoid duplicate processing
    if (!empty($userInfo['last_pw_change'])) {
        $timeSinceChange = time() - (int) $userInfo['last_pw_change'];
        if ($timeSinceChange < 30) { // 30 seconds
            return true; // Already processed
        }
    }

    // Try to decrypt with new password first (maybe already updated)
    try {
        $testDecrypt = decryptPrivateKey($newPassword, $userInfo['private_key']);
        if (!empty($testDecrypt)) {
            // Password already works, just update timestamp
            DB::update(
                prefixTable('users'),
                ['last_pw_change' => time()],
                'id = %i',
                $userId
            );
            return true;
        }
    } catch (Exception $e) {
        // Expected - old password doesn't work, continue with recovery
    }

    // Attempt transparent recovery
    $result = attemptTransparentRecovery($userInfo, $newPassword, $SETTINGS);

    if ($result['success']) {
        return true;
    }

    // Recovery failed - disable user and alert admins
    DB::update(
        prefixTable('users'),
        [
            'disabled' => 1,
            'special' => 'recrypt-private-key',
        ],
        'id = %i',
        $userId
    );

    // Log critical event
    logEvents(
        $SETTINGS,
        'security_alert',
        'auto_reencryption_critical_failure',
        (string) $userId,
        'User: ' . $userInfo['login'] . ' - disabled due to key recovery failure'
    );

    return false;
}

/**
 * Encrypts a string using AES.
 *
 * @param string $data String to encrypt
 * @param string $key
 *
 * @return array
 */
function doDataEncryption(string $data, ?string $key = null): array
{
    // Sanitize
    $antiXss = new AntiXSS();
    $data = $antiXss->xss_clean($data);
    
    // Load classes
    $cipher = new Crypt_AES(CRYPT_AES_MODE_CBC);
    // Generate an object key
    $objectKey = is_null($key) === true ? uniqidReal(KEY_LENGTH) : $antiXss->xss_clean($key);
    // Set it as password
    $cipher->setPassword($objectKey);
    return [
        'encrypted' => base64_encode($cipher->encrypt($data)),
        'objectKey' => base64_encode($objectKey),
    ];
}

/**
 * Decrypts a string using AES.
 *
 * @param string $data Encrypted data
 * @param string $key  Key to uncrypt
 *
 * @return string
 */
function doDataDecryption(string $data, string $key): string
{
    // Sanitize
    $antiXss = new AntiXSS();
    $data = $antiXss->xss_clean($data);
    $key = $antiXss->xss_clean($key);

    // Load classes
    $cipher = new Crypt_AES();
    // Set the object key
    $cipher->setPassword(base64_decode($key));
    return base64_encode((string) $cipher->decrypt(base64_decode($data)));
}

/**
 * Encrypts using RSA a string using a public key.
 *
 * @param string $key       Key to be encrypted
 * @param string $publicKey User public key
 *
 * @return string
 */
function encryptUserObjectKey(string $key, string $publicKey): string
{
    // Empty password
    if (empty($key)) return '';

    // Sanitize
    $antiXss = new AntiXSS();
    $publicKey = $antiXss->xss_clean($publicKey);
    // Load classes
    $rsa = new Crypt_RSA();
    // Load the public key
    $decodedPublicKey = base64_decode($publicKey, true);
    if ($decodedPublicKey === false) {
        throw new InvalidArgumentException("Error while decoding key.");
    }
    $rsa->loadKey($decodedPublicKey);
    // Encrypt
    $encrypted = $rsa->encrypt(base64_decode($key));
    if (empty($encrypted)) {  // Check if key is empty or null
        throw new RuntimeException("Error while encrypting key.");
    }
    // Return
    return base64_encode($encrypted);
}

/**
 * Decrypts using RSA an encrypted string using a private key.
 *
 * @param string $key        Encrypted key
 * @param string $privateKey User private key
 *
 * @return string
 */
function decryptUserObjectKey(string $key, string $privateKey): string
{
    // Sanitize
    $antiXss = new AntiXSS();
    $privateKey = $antiXss->xss_clean($privateKey);

    // Load classes
    $rsa = new Crypt_RSA();
    // Load the private key
    $decodedPrivateKey = base64_decode($privateKey, true);
    if ($decodedPrivateKey === false) {
        throw new InvalidArgumentException("Error while decoding private key.");
    }

    $rsa->loadKey($decodedPrivateKey);

    // Decrypt
    try {
        $decodedKey = base64_decode($key, true);
        if ($decodedKey === false) {
            throw new InvalidArgumentException("Error while decoding key.");
        }

        // This check is needed as decrypt() in version 2 can return false in case of error
        $tmpValue = $rsa->decrypt($decodedKey);
        if ($tmpValue !== false) {
            return base64_encode($tmpValue);
        } else {
            return '';
        }
    } catch (Exception $e) {
        if (defined('LOG_TO_SERVER') && LOG_TO_SERVER === true) {
            error_log('TEAMPASS Error - ldap - '.$e->getMessage());
        }
        return 'Exception: could not decrypt object';
    }
}

/**
 * Encrypts a file.
 *
 * @param string $fileInName File name
 * @param string $fileInPath Path to file
 *
 * @return array
 */
function encryptFile(string $fileInName, string $fileInPath): array
{
    if (defined('FILE_BUFFER_SIZE') === false) {
        define('FILE_BUFFER_SIZE', 128 * 1024);
    }

    // Load classes
    $cipher = new Crypt_AES();

    // Generate an object key
    $objectKey = uniqidReal(32);
    // Set it as password
    $cipher->setPassword($objectKey);
    // Prevent against out of memory
    $cipher->enableContinuousBuffer();

    // Encrypt the file content
    $filePath = filter_var($fileInPath . '/' . $fileInName, FILTER_SANITIZE_URL);
    $fileContent = file_get_contents($filePath);
    $plaintext = $fileContent;
    $ciphertext = $cipher->encrypt($plaintext);

    // Save new file
    // deepcode ignore InsecureHash: is simply used to get a unique name
    $hash = uniqid('', true);
    $fileOut = $fileInPath . '/' . TP_FILE_PREFIX . $hash;
    file_put_contents($fileOut, $ciphertext);
    unlink($fileInPath . '/' . $fileInName);
    return [
        'fileHash' => base64_encode($hash),
        'objectKey' => base64_encode($objectKey),
    ];
}

/**
 * Decrypt a file.
 *
 * @param string $fileName File name
 * @param string $filePath Path to file
 * @param string $key      Key to use
 *
 * @return string|array
 */
function decryptFile(string $fileName, string $filePath, string $key): string|array
{
    if (! defined('FILE_BUFFER_SIZE')) {
        define('FILE_BUFFER_SIZE', 128 * 1024);
    }
    
    // Load classes
    $cipher = new Crypt_AES();
    $antiXSS = new AntiXSS();
    
    // Get file name
    $safeFileName = $antiXSS->xss_clean(base64_decode($fileName));

    // Set the object key
    $cipher->setPassword(base64_decode($key));
    // Prevent against out of memory
    $cipher->enableContinuousBuffer();
    $cipher->disablePadding();
    // Get file content
    $safeFilePath = realpath($filePath . '/' . TP_FILE_PREFIX . $safeFileName);
    if ($safeFilePath !== false && file_exists($safeFilePath)) {
        $ciphertext = file_get_contents(filter_var($safeFilePath, FILTER_SANITIZE_URL));
    } else {
        // Handle the error: file doesn't exist or path is invalid
        return [
            'error' => true,
            'message' => 'This file has not been found.',
        ];
    }

    if (WIP) error_log('DEBUG: File image url -> '.filter_var($safeFilePath, FILTER_SANITIZE_URL));

    // Decrypt file content and return
    return base64_encode($cipher->decrypt($ciphertext));
}

/**
 * Generate a simple password
 *
 * @param int $length Length of string
 * @param bool $symbolsincluded Allow symbols
 *
 * @return string
 */
function generateQuickPassword(int $length = 16, bool $symbolsincluded = true): string
{
    // Generate new user password
    $small_letters = range('a', 'z');
    $big_letters = range('A', 'Z');
    $digits = range(0, 9);
    $symbols = $symbolsincluded === true ?
        ['#', '_', '-', '@', '$', '+', '!'] : [];
    $res = array_merge($small_letters, $big_letters, $digits, $symbols);
    $count = count($res);
    // first variant

    $random_string = '';
    for ($i = 0; $i < $length; ++$i) {
        $random_string .= $res[random_int(0, $count - 1)];
    }

    return $random_string;
}

/**
 * Permit to store the sharekey of an object for users.
 *
 * @param string $object_name             Type for table selection
 * @param int    $post_folder_is_personal Personal
 * @param int    $post_object_id          Object
 * @param string $objectKey               Object key
 * @param array  $SETTINGS                Teampass settings
 * @param int    $user_id                 User ID if needed
 * @param bool   $onlyForUser             If is TRUE, then the sharekey is only for the user
 * @param bool   $deleteAll               If is TRUE, then all existing entries are deleted
 * @param array  $objectKeyArray          Array of objects
 * @param int    $all_users_except_id     All users except this one
 * @param int    $apiUserId               API User ID
 *
 * @return void
 */
function storeUsersShareKey(
    string $object_name,
    int $post_folder_is_personal,
    int $post_object_id,
    string $objectKey,
    bool $onlyForUser = false,
    bool $deleteAll = true,
    array $objectKeyArray = [],
    int $all_users_except_id = -1,
    int $apiUserId = -1
): void {
    
    $session = SessionManager::getSession();
    loadClasses('DB');

    // Delete existing entries for this object
    if ($deleteAll === true) {
        DB::delete(
            $object_name,
            'object_id = %i',
            $post_object_id
        );
    }

    // Get the user ID
    $userId = ($apiUserId === -1) ? (int) $session->get('user-id') : $apiUserId;
    
    // $onlyForUser is only dynamically set by external calls
    if (
        $onlyForUser === true || (int) $post_folder_is_personal === 1
    ) {
        // Only create the sharekey for a user
        $user = DB::queryFirstRow(
            'SELECT public_key
            FROM ' . prefixTable('users') . '
            WHERE id = %i
            AND public_key != ""',
            $userId
        );

        if (empty($objectKey) === false) {
            DB::insert(
                $object_name,
                [
                    'object_id' => (int) $post_object_id,
                    'user_id' => $userId,
                    'share_key' => encryptUserObjectKey(
                        $objectKey,
                        $user['public_key']
                    ),
                ]
            );
        } else if (count($objectKeyArray) > 0) {
            foreach ($objectKeyArray as $object) {
                DB::insert(
                    $object_name,
                    [
                        'object_id' => (int) $object['objectId'],
                        'user_id' => $userId,
                        'share_key' => encryptUserObjectKey(
                            $object['objectKey'],
                            $user['public_key']
                        ),
                    ]
                );
            }
        }
    } else {
        // Create sharekey for each user
        $user_ids = [OTV_USER_ID, SSH_USER_ID, API_USER_ID];
        if ($all_users_except_id !== -1) {
            array_push($user_ids, (int) $all_users_except_id);
        }
        $users = DB::query(
            'SELECT id, public_key
            FROM ' . prefixTable('users') . '
            WHERE id NOT IN %li
            AND public_key != ""',
            $user_ids
        );
        //DB::debugmode(false);
        foreach ($users as $user) {
            // Insert in DB the new object key for this item by user
            if (count($objectKeyArray) === 0) {
                if (WIP === true) error_log('TEAMPASS Debug - storeUsersShareKey case1 - ' . $object_name . ' - ' . $post_object_id . ' - ' . $user['id'] . ' - ' . $objectKey);
                DB::insert(
                    $object_name,
                    [
                        'object_id' => $post_object_id,
                        'user_id' => (int) $user['id'],
                        'share_key' => encryptUserObjectKey(
                            $objectKey,
                            $user['public_key']
                        ),
                    ]
                );
            } else {
                foreach ($objectKeyArray as $object) {
                    if (WIP === true) error_log('TEAMPASS Debug - storeUsersShareKey case2 - ' . $object_name . ' - ' . $object['objectId'] . ' - ' . $user['id'] . ' - ' . $object['objectKey']);
                    DB::insert(
                        $object_name,
                        [
                            'object_id' => (int) $object['objectId'],
                            'user_id' => (int) $user['id'],
                            'share_key' => encryptUserObjectKey(
                                $object['objectKey'],
                                $user['public_key']
                            ),
                        ]
                    );
                }
            }
        }
    }
}

/**
 * Is this string base64 encoded?
 *
 * @param string $str Encoded string?
 *
 * @return bool
 */
function isBase64(string $str): bool
{
    $str = (string) trim($str);
    if (! isset($str[0])) {
        return false;
    }

    $base64String = (string) base64_decode($str, true);
    if ($base64String && base64_encode($base64String) === $str) {
        return true;
    }

    return false;
}

/**
 * Undocumented function
 *
 * @param string $field Parameter
 *
 * @return array|bool|resource|string
 */
function filterString(string $field)
{
    // Sanitize string
    $field = filter_var(trim($field), FILTER_SANITIZE_FULL_SPECIAL_CHARS);
    if (empty($field) === false) {
        // Load AntiXSS
        $antiXss = new AntiXSS();
        // Return
        return $antiXss->xss_clean($field);
    }

    return false;
}

/**
 * CHeck if provided credentials are allowed on server
 *
 * @param string $login    User Login
 * @param string $password User Pwd
 * @param array  $SETTINGS Teampass settings
 *
 * @return bool
 */
function ldapCheckUserPassword(string $login, string $password, array $SETTINGS): bool
{
    // Build ldap configuration array
    $config = [
        // Mandatory Configuration Options
        'hosts' => [$SETTINGS['ldap_hosts']],
        'base_dn' => $SETTINGS['ldap_bdn'],
        'username' => $SETTINGS['ldap_username'],
        'password' => $SETTINGS['ldap_password'],

        // Optional Configuration Options
        'port' => $SETTINGS['ldap_port'],
        'use_ssl' => (int) $SETTINGS['ldap_ssl'] === 1 ? true : false,
        'use_tls' => (int) $SETTINGS['ldap_tls'] === 1 ? true : false,
        'version' => 3,
        'timeout' => 5,
        'follow_referrals' => false,

        // Custom LDAP Options
        'options' => [
            // See: http://php.net/ldap_set_option
            LDAP_OPT_X_TLS_REQUIRE_CERT => (isset($SETTINGS['ldap_tls_certificate_check']) ? $SETTINGS['ldap_tls_certificate_check'] : LDAP_OPT_X_TLS_HARD),
        ],
    ];
    
    $connection = new Connection($config);
    // Connect to LDAP
    try {
        $connection->connect();
    } catch (\LdapRecord\Auth\BindException $e) {
        $error = $e->getDetailedError();
        if ($error && defined('LOG_TO_SERVER') && LOG_TO_SERVER === true) {
            error_log('TEAMPASS Error - LDAP - '.$error->getErrorCode()." - ".$error->getErrorMessage(). " - ".$error->getDiagnosticMessage());
        }
        // deepcode ignore ServerLeak: No important data is sent
        echo 'An error occurred.';
        return false;
    }

    // Authenticate user
    try {
        if ($SETTINGS['ldap_type'] === 'ActiveDirectory') {
            $connection->auth()->attempt($login, $password, $stayAuthenticated = true);
        } else {
            $connection->auth()->attempt($SETTINGS['ldap_user_attribute'].'='.$login.','.(isset($SETTINGS['ldap_dn_additional_user_dn']) && !empty($SETTINGS['ldap_dn_additional_user_dn']) ? $SETTINGS['ldap_dn_additional_user_dn'].',' : '').$SETTINGS['ldap_bdn'], $password, $stayAuthenticated = true);
        }
    } catch (\LdapRecord\Auth\BindException $e) {
        $error = $e->getDetailedError();
        if ($error && defined('LOG_TO_SERVER') && LOG_TO_SERVER === true) {
            error_log('TEAMPASS Error - LDAP - '.$error->getErrorCode()." - ".$error->getErrorMessage(). " - ".$error->getDiagnosticMessage());
        }
        // deepcode ignore ServerLeak: No important data is sent
        echo 'An error occurred.';
        return false;
    }

    return true;
}

/**
 * Removes from DB all sharekeys of this user
 *
 * @param int $userId User's id
 * @param array   $SETTINGS Teampass settings
 *
 * @return bool
 */
function deleteUserObjetsKeys(int $userId, array $SETTINGS = []): bool
{
    // Return if technical accounts
    if ($userId === OTV_USER_ID
        || $userId === SSH_USER_ID
        || $userId === API_USER_ID
        || $userId === TP_USER_ID
    ) {
        return false;
    }

    // Load class DB
    loadClasses('DB');

    // Remove all item sharekeys items
    // expect if personal item
    DB::delete(
        prefixTable('sharekeys_items'),
        'user_id = %i AND object_id NOT IN (SELECT i.id FROM ' . prefixTable('items') . ' AS i WHERE i.perso = 1)',
        $userId
    );
    // Remove all item sharekeys files
    DB::delete(
        prefixTable('sharekeys_files'),
        'user_id = %i AND object_id NOT IN (
            SELECT f.id 
            FROM ' . prefixTable('items') . ' AS i 
            INNER JOIN ' . prefixTable('files') . ' AS f ON f.id_item = i.id
            WHERE i.perso = 1
        )',
        $userId
    );
    // Remove all item sharekeys fields
    DB::delete(
        prefixTable('sharekeys_fields'),
        'user_id = %i AND object_id NOT IN (
            SELECT c.id 
            FROM ' . prefixTable('items') . ' AS i 
            INNER JOIN ' . prefixTable('categories_items') . ' AS c ON c.item_id = i.id
            WHERE i.perso = 1
        )',
        $userId
    );
    // Remove all item sharekeys logs
    DB::delete(
        prefixTable('sharekeys_logs'),
        'user_id = %i AND object_id NOT IN (SELECT i.id FROM ' . prefixTable('items') . ' AS i WHERE i.perso = 1)',
        $userId
    );
    // Remove all item sharekeys suggestions
    DB::delete(
        prefixTable('sharekeys_suggestions'),
        'user_id = %i AND object_id NOT IN (SELECT i.id FROM ' . prefixTable('items') . ' AS i WHERE i.perso = 1)',
        $userId
    );
    return false;
}

/**
 * Manage list of timezones   $SETTINGS Teampass settings
 *
 * @return array
 */
function timezone_list()
{
    static $timezones = null;
    if ($timezones === null) {
        $timezones = [];
        $offsets = [];
        $now = new DateTime('now', new DateTimeZone('UTC'));
        foreach (DateTimeZone::listIdentifiers() as $timezone) {
            $now->setTimezone(new DateTimeZone($timezone));
            $offsets[] = $offset = $now->getOffset();
            $timezones[$timezone] = '(' . format_GMT_offset($offset) . ') ' . format_timezone_name($timezone);
        }

        array_multisort($offsets, $timezones);
    }

    return $timezones;
}

/**
 * Provide timezone offset
 *
 * @param int $offset Timezone offset
 *
 * @return string
 */
function format_GMT_offset($offset): string
{
    $hours = intval($offset / 3600);
    $minutes = abs(intval($offset % 3600 / 60));
    return 'GMT' . ($offset ? sprintf('%+03d:%02d', $hours, $minutes) : '');
}

/**
 * Provides timezone name
 *
 * @param string $name Timezone name
 *
 * @return string
 */
function format_timezone_name($name): string
{
    $name = str_replace('/', ', ', $name);
    $name = str_replace('_', ' ', $name);

    return str_replace('St ', 'St. ', $name);
}

/**
 * Provides info if user should use MFA based on roles
 *
 * @param string $userRolesIds  User roles ids
 * @param string $mfaRoles      Roles for which MFA is requested
 *
 * @return bool
 */
function mfa_auth_requested_roles(string $userRolesIds, string $mfaRoles): bool
{
    if (empty($mfaRoles) === true) {
        return true;
    }

    $mfaRoles = array_values(json_decode($mfaRoles, true));
    $userRolesIds = array_filter(explode(';', $userRolesIds));
    if (count($mfaRoles) === 0 || count(array_intersect($mfaRoles, $userRolesIds)) > 0) {
        return true;
    }

    return false;
}

/**
 * Permits to clean a string for export purpose
 *
 * @param string $text
 * @param bool $emptyCheckOnly
 * 
 * @return string
 */
function cleanStringForExport(string $text, bool $emptyCheckOnly = false): string
{
    if (is_null($text) === true || empty($text) === true) {
        return '';
    }
    // only expected to check if $text was empty
    elseif ($emptyCheckOnly === true) {
        return $text;
    }

    return strip_tags(
        cleanString(
            html_entity_decode($text, ENT_QUOTES | ENT_XHTML, 'UTF-8'),
            true)
        );
}

/**
 * Permits to check if user ID is valid
 *
 * @param integer $post_user_id
 * @return bool
 */
function isUserIdValid($userId): bool
{
    if (is_null($userId) === false
        && empty($userId) === false
    ) {
        return true;
    }
    return false;
}

/**
 * Check if a key exists and if its value equal the one expected
 *
 * @param string $key
 * @param integer|string $value
 * @param array $array
 * 
 * @return boolean
 */
function isKeyExistingAndEqual(
    string $key,
    /*PHP8 - integer|string*/$value,
    array $array
): bool
{
    if (isset($array[$key]) === true
        && (is_int($value) === true ?
            (int) $array[$key] === $value :
            (string) $array[$key] === $value)
    ) {
        return true;
    }
    return false;
}

/**
 * Check if a variable is not set or equal to a value
 *
 * @param string|null $var
 * @param integer|string $value
 * 
 * @return boolean
 */
function isKeyNotSetOrEqual(
    /*PHP8 - string|null*/$var,
    /*PHP8 - integer|string*/$value
): bool
{
    if (isset($var) === false
        || (is_int($value) === true ?
            (int) $var === $value :
            (string) $var === $value)
    ) {
        return true;
    }
    return false;
}

/**
 * Check if a key exists and if its value < to the one expected
 *
 * @param string $key
 * @param integer $value
 * @param array $array
 * 
 * @return boolean
 */
function isKeyExistingAndInferior(string $key, int $value, array $array): bool
{
    if (isset($array[$key]) === true && (int) $array[$key] < $value) {
        return true;
    }
    return false;
}

/**
 * Check if a key exists and if its value > to the one expected
 *
 * @param string $key
 * @param integer $value
 * @param array $array
 * 
 * @return boolean
 */
function isKeyExistingAndSuperior(string $key, int $value, array $array): bool
{
    if (isset($array[$key]) === true && (int) $array[$key] > $value) {
        return true;
    }
    return false;
}

/**
 * Check if values in array are set
 * Return true if all set
 * Return false if one of them is not set
 *
 * @param array $arrayOfValues
 * @return boolean
 */
function isSetArrayOfValues(array $arrayOfValues): bool
{
    foreach($arrayOfValues as $value) {
        if (isset($value) === false) {
            return false;
        }
    }
    return true;
}

/**
 * Check if values in array are set
 * Return true if all set
 * Return false if one of them is not set
 *
 * @param array $arrayOfValues
 * @param integer|string $value
 * @return boolean
 */
function isArrayOfVarsEqualToValue(
    array $arrayOfVars,
    /*PHP8 - integer|string*/$value
) : bool
{
    foreach($arrayOfVars as $variable) {
        if ($variable !== $value) {
            return false;
        }
    }
    return true;
}

/**
 * Checks if at least one variable in array is equal to value
 *
 * @param array $arrayOfValues
 * @param integer|string $value
 * @return boolean
 */
function isOneVarOfArrayEqualToValue(
    array $arrayOfVars,
    /*PHP8 - integer|string*/$value
) : bool
{
    foreach($arrayOfVars as $variable) {
        if ($variable === $value) {
            return true;
        }
    }
    return false;
}

/**
 * Checks is value is null, not set OR empty
 *
 * @param string|int|null $value
 * @return boolean
 */
function isValueSetNullEmpty(string|int|null $value) : bool
{
    if (is_null($value) === true || empty($value) === true) {
        return true;
    }
    return false;
}

/**
 * Checks if value is set and if empty is equal to passed boolean
 *
 * @param string|int $value
 * @param boolean $boolean
 * @return boolean
 */
function isValueSetEmpty($value, $boolean = true) : bool
{
    if (empty($value) === $boolean) {
        return true;
    }
    return false;
}

/**
 * Ensure Complexity is translated
 *
 * @return void
 */
function defineComplexity() : void
{
    // Load user's language
    $session = SessionManager::getSession();
    $lang = new Language($session->get('user-language') ?? 'english');
    
    if (defined('TP_PW_COMPLEXITY') === false) {
        define(
            'TP_PW_COMPLEXITY',
            [
                TP_PW_STRENGTH_1 => array(TP_PW_STRENGTH_1, $lang->get('complex_level1'), 'fas fa-thermometer-empty text-danger'),
                TP_PW_STRENGTH_2 => array(TP_PW_STRENGTH_2, $lang->get('complex_level2'), 'fas fa-thermometer-quarter text-warning'),
                TP_PW_STRENGTH_3 => array(TP_PW_STRENGTH_3, $lang->get('complex_level3'), 'fas fa-thermometer-half text-warning'),
                TP_PW_STRENGTH_4 => array(TP_PW_STRENGTH_4, $lang->get('complex_level4'), 'fas fa-thermometer-three-quarters text-success'),
                TP_PW_STRENGTH_5 => array(TP_PW_STRENGTH_5, $lang->get('complex_level5'), 'fas fa-thermometer-full text-success'),
            ]
        );
    }
}

/**
 * Uses Sanitizer to perform data sanitization
 *
 * @param array     $data
 * @param array     $filters
 * @return array|string
 */
function dataSanitizer(array $data, array $filters): array|string
{
    // Load Sanitizer library
    $sanitizer = new Sanitizer($data, $filters);

    // Load AntiXSS
    $antiXss = new AntiXSS();

    // Sanitize post and get variables
    return $antiXss->xss_clean($sanitizer->sanitize());
}

/**
 * Permits to manage the cache tree for a user
 *
 * @param integer $user_id
 * @param string $data
 * @param array $SETTINGS
 * @param string $field_update
 * @return void
 */
function cacheTreeUserHandler(int $user_id, string $data, array $SETTINGS, string $field_update = '')
{
    // Load class DB
    loadClasses('DB');

    // Exists ?
    $userCacheId = DB::queryFirstRow(
        'SELECT increment_id
        FROM ' . prefixTable('cache_tree') . '
        WHERE user_id = %i',
        $user_id
    );
    
    if (is_null($userCacheId) === true || count($userCacheId) === 0) {
        // insert in table
        DB::insert(
            prefixTable('cache_tree'),
            array(
                'data' => $data,
                'timestamp' => time(),
                'user_id' => $user_id,
                'visible_folders' => '',
            )
        );
    } else {
        if (empty($field_update) === true) {
            DB::update(
                prefixTable('cache_tree'),
                [
                    'timestamp' => time(),
                    'data' => $data,
                ],
                'increment_id = %i',
                $userCacheId['increment_id']
            );
        /* USELESS
        } else {
            DB::update(
                prefixTable('cache_tree'),
                [
                    $field_update => $data,
                ],
                'increment_id = %i',
                $userCacheId['increment_id']
            );*/
        }
    }
}

/**
 * Permits to calculate a %
 *
 * @param float $nombre
 * @param float $total
 * @param float $pourcentage
 * @return float
 */
function pourcentage(float $nombre, float $total, float $pourcentage): float
{ 
    $resultat = ($nombre/$total) * $pourcentage;
    return round($resultat);
}

/**
 * Load the folders list from the cache
 *
 * @param string $fieldName
 * @param string $sessionName
 * @param boolean $forceRefresh
 * @return array
 */
function loadFoldersListByCache(
    string $fieldName,
    string $sessionName,
    bool $forceRefresh = false
): array
{
    // Case when refresh is EXPECTED / MANDATORY
    if ($forceRefresh === true) {
        return [
            'state' => false,
            'data' => [],
        ];
    }
    
    $session = SessionManager::getSession();

    // Get last folder update
    $lastFolderChange = DB::queryFirstRow(
        'SELECT valeur FROM ' . prefixTable('misc') . '
        WHERE type = %s AND intitule = %s',
        'timestamp',
        'last_folder_change'
    );
    if (DB::count() === 0) {
        $lastFolderChange['valeur'] = 0;
    }

    // Case when an update in the tree has been done
    // Refresh is then mandatory
    if ((int) $lastFolderChange['valeur'] > (int) (null !== $session->get('user-tree_last_refresh_timestamp') ? $session->get('user-tree_last_refresh_timestamp') : 0)) {
        return [
            'state' => false,
            'data' => [],
        ];
    }
    
    // Does this user has a tree cache
    $userCacheTree = DB::queryFirstRow(
        'SELECT '.$fieldName.'
        FROM ' . prefixTable('cache_tree') . '
        WHERE user_id = %i',
        $session->get('user-id')
    );
    if (empty($userCacheTree[$fieldName]) === false && $userCacheTree[$fieldName] !== '[]') {
        return [
            'state' => true,
            'data' => $userCacheTree[$fieldName],
            'extra' => '',
        ];
    }

    return [
        'state' => false,
        'data' => [],
    ];
}


/**
 * Permits to refresh the categories of folders
 *
 * @param array $folderIds
 * @return void
 */
function handleFoldersCategories(
    array $folderIds
)
{
    // Load class DB
    loadClasses('DB');

    $arr_data = array();

    // force full list of folders
    if (count($folderIds) === 0) {
        $folderIds = DB::queryFirstColumn(
            'SELECT id
            FROM ' . prefixTable('nested_tree') . '
            WHERE personal_folder=%i',
            0
        );
    }

    // Get complexity
    defineComplexity();

    // update
    foreach ($folderIds as $folder) {
        // Do we have Categories
        // get list of associated Categories
        $arrCatList = array();
        $rows_tmp = DB::query(
            'SELECT c.id, c.title, c.level, c.type, c.masked, c.order, c.encrypted_data, c.role_visibility, c.is_mandatory,
            f.id_category AS category_id
            FROM ' . prefixTable('categories_folders') . ' AS f
            INNER JOIN ' . prefixTable('categories') . ' AS c ON (f.id_category = c.parent_id)
            WHERE id_folder=%i',
            $folder
        );
        if (DB::count() > 0) {
            foreach ($rows_tmp as $row) {
                $arrCatList[$row['id']] = array(
                    'id' => $row['id'],
                    'title' => $row['title'],
                    'level' => $row['level'],
                    'type' => $row['type'],
                    'masked' => $row['masked'],
                    'order' => $row['order'],
                    'encrypted_data' => $row['encrypted_data'],
                    'role_visibility' => $row['role_visibility'],
                    'is_mandatory' => $row['is_mandatory'],
                    'category_id' => $row['category_id'],
                );
            }
        }
        $arr_data['categories'] = $arrCatList;

        // Now get complexity
        $valTemp = '';
        $data = DB::queryFirstRow(
            'SELECT valeur
            FROM ' . prefixTable('misc') . '
            WHERE type = %s AND intitule=%i',
            'complex',
            $folder
        );
        if (DB::count() > 0 && empty($data['valeur']) === false) {
            $valTemp = array(
                'value' => $data['valeur'],
                'text' => TP_PW_COMPLEXITY[$data['valeur']][1],
            );
        }
        $arr_data['complexity'] = $valTemp;

        // Now get Roles
        $valTemp = '';
        $rows_tmp = DB::query(
            'SELECT t.title
            FROM ' . prefixTable('roles_values') . ' as v
            INNER JOIN ' . prefixTable('roles_title') . ' as t ON (v.role_id = t.id)
            WHERE v.folder_id = %i
            GROUP BY title',
            $folder
        );
        foreach ($rows_tmp as $record) {
            $valTemp .= (empty($valTemp) === true ? '' : ' - ') . $record['title'];
        }
        $arr_data['visibilityRoles'] = $valTemp;

        // now save in DB
        DB::update(
            prefixTable('nested_tree'),
            array(
                'categories' => json_encode($arr_data),
            ),
            'id = %i',
            $folder
        );
    }
}

/**
 * List all users that have specific roles
 *
 * @param array $roles
 * @return array
 */
function getUsersWithRoles(
    array $roles
): array
{
    $session = SessionManager::getSession();
    $arrUsers = array();

    foreach ($roles as $role) {
        // loop on users and check if user has this role
        $rows = DB::query(
            'SELECT id, fonction_id
            FROM ' . prefixTable('users') . '
            WHERE id != %i AND admin = 0 AND fonction_id IS NOT NULL AND fonction_id != ""',
            $session->get('user-id')
        );
        foreach ($rows as $user) {
            $userRoles = is_null($user['fonction_id']) === false && empty($user['fonction_id']) === false ? explode(';', $user['fonction_id']) : [];
            if (in_array($role, $userRoles, true) === true) {
                array_push($arrUsers, $user['id']);
            }
        }
    }

    return $arrUsers;
}


/**
 * Get all users informations
 *
 * @param integer $userId
 * @return array
 */
function getFullUserInfos(
    int $userId
): array
{
    if (empty($userId) === true) {
        return array();
    }

    $val = DB::queryFirstRow(
        'SELECT *
        FROM ' . prefixTable('users') . '
        WHERE id = %i',
        $userId
    );

    return $val;
}

/**
 * Is required an upgrade
 *
 * @return boolean
 */
function upgradeRequired(): bool
{
    // Get settings.php
    include_once __DIR__. '/../includes/config/settings.php';

    // Get timestamp in DB
    $val = DB::queryFirstRow(
        'SELECT valeur
        FROM ' . prefixTable('misc') . '
        WHERE type = %s AND intitule = %s',
        'admin',
        'upgrade_timestamp'
    );

    // Check if upgrade is required
    return (
        is_null($val) || count($val) === 0 || !defined('UPGRADE_MIN_DATE') || 
        empty($val['valeur']) || (int) $val['valeur'] < (int) UPGRADE_MIN_DATE
    );
}

/**
 * Permits to change the user keys on his demand
 *
 * @param integer $userId
 * @param string $passwordClear
 * @param integer $nbItemsToTreat
 * @param string $encryptionKey
 * @param boolean $deleteExistingKeys
 * @param boolean $sendEmailToUser
 * @param boolean $encryptWithUserPassword
 * @param boolean $generate_user_new_password
 * @param string $emailBody
 * @param boolean $user_self_change
 * @param string $recovery_public_key
 * @param string $recovery_private_key
 * @param bool $userHasToEncryptPersonalItemsAfter
 * @return string
 */
function handleUserKeys(
    int $userId,
    string $passwordClear,
    int $nbItemsToTreat,
    string $encryptionKey = '',
    bool $deleteExistingKeys = false,
    bool $sendEmailToUser = true,
    bool $encryptWithUserPassword = false,
    bool $generate_user_new_password = false,
    string $emailBody = '',
    bool $user_self_change = false,
    string $recovery_public_key = '',
    string $recovery_private_key = '',
    bool $userHasToEncryptPersonalItemsAfter = false
): string
{
    $session = SessionManager::getSession();
    $lang = new Language($session->get('user-language') ?? 'english');

    // prepapre background tasks for item keys generation        
    $userTP = DB::queryFirstRow(
        'SELECT pw, public_key, private_key
        FROM ' . prefixTable('users') . '
        WHERE id = %i',
        TP_USER_ID
    );
    if (DB::count() === 0) {
        return prepareExchangedData(
            array(
                'error' => true,
                'message' => 'User not exists',
            ),
            'encode'
        );
    }

    // Do we need to generate new user password
    if ($generate_user_new_password === true) {
        // Generate a new password
        $passwordClear = GenerateCryptKey(20, false, true, true, false, true);
    }

    // Create password hash
    $passwordManager = new PasswordManager();
    $hashedPassword = $passwordManager->hashPassword($passwordClear);
    if ($passwordManager->verifyPassword($hashedPassword, $passwordClear) === false) {
        return prepareExchangedData(
            array(
                'error' => true,
                'message' => $lang->get('pw_hash_not_correct'),
            ),
            'encode'
        );
    }

    // Check if valid public/private keys
    if ($recovery_public_key !== '' && $recovery_private_key !== '') {
        try {
            // Generate random string
            $random_str = generateQuickPassword(12, false);
            // Encrypt random string with user publick key
            $encrypted = encryptUserObjectKey($random_str, $recovery_public_key);
            // Decrypt $encrypted with private key
            $decrypted = decryptUserObjectKey($encrypted, $recovery_private_key);
            // Check if decryptUserObjectKey returns our random string
            if ($decrypted !== $random_str) {
                throw new Exception('Public/Private keypair invalid.');
            }
        } catch (Exception $e) {
            // Show error message to user and log event
            if (defined('LOG_TO_SERVER') && LOG_TO_SERVER === true) {
                error_log('ERROR: User '.$userId.' - '.$e->getMessage());
            }
            return prepareExchangedData([
                    'error' => true,
                    'message' => $lang->get('pw_encryption_error'),
                ],
                'encode'
            );
        }
    }

    // Generate new keys
    if ($user_self_change === true && empty($recovery_public_key) === false && empty($recovery_private_key) === false){
        $userKeys = [
            'public_key' => $recovery_public_key,
            'private_key_clear' => $recovery_private_key,
            'private_key' => encryptPrivateKey($passwordClear, $recovery_private_key),
        ];
    } else {
        $userKeys = generateUserKeys($passwordClear);
    }
    
    // Handle private key
    insertPrivateKeyWithCurrentFlag(
        $userId,
        $userKeys['private_key'],        
    );

    // Save in DB
    // TODO: remove private key field from Users table
    DB::update(
        prefixTable('users'),
        array(
            'pw' => $hashedPassword,
            'public_key' => $userKeys['public_key'],
            'private_key' => $userKeys['private_key'],
            'keys_recovery_time' => NULL,
        ),
        'id=%i',
        $userId
    );


    // update session too
    if ($userId === $session->get('user-id')) {
        $session->set('user-private_key', $userKeys['private_key_clear']);
        $session->set('user-public_key', $userKeys['public_key']);
        // Notify user that he must re download his keys:
        $session->set('user-keys_recovery_time', NULL);
    }

    // Manage empty encryption key
    // Let's take the user's password if asked and if no encryption key provided
    $encryptionKey = $encryptWithUserPassword === true && empty($encryptionKey) === true ? $passwordClear : $encryptionKey;

    // Create process
    DB::insert(
        prefixTable('background_tasks'),
        array(
            'created_at' => time(),
            'process_type' => 'create_user_keys',
            'arguments' => json_encode([
                'new_user_id' => (int) $userId,
                'new_user_pwd' => cryption($passwordClear, '','encrypt')['string'],
                'new_user_code' => cryption(empty($encryptionKey) === true ? uniqidReal(20) : $encryptionKey, '','encrypt')['string'],
                'owner_id' => (int) TP_USER_ID,
                'creator_pwd' => $userTP['pw'],
                'send_email' => $sendEmailToUser === true ? 1 : 0,
                'otp_provided_new_value' => 1,
                'email_body' => empty($emailBody) === true ? '' : $lang->get($emailBody),
                'user_self_change' => $user_self_change === true ? 1 : 0,
                'userHasToEncryptPersonalItemsAfter' => $userHasToEncryptPersonalItemsAfter === true ? 1 : 0,
            ]),
        )
    );
    $processId = DB::insertId();

    // Delete existing keys
    if ($deleteExistingKeys === true) {
        deleteUserObjetsKeys(
            (int) $userId,
        );
    }

    // Create tasks
    createUserTasks($processId, $nbItemsToTreat);

    // update user's new status
    DB::update(
        prefixTable('users'),
        [
            'is_ready_for_usage' => 0,
            'otp_provided' => 1,
            'ongoing_process_id' => $processId,
            'special' => 'generate-keys',
        ],
        'id=%i',
        $userId
    );

    return prepareExchangedData(
        array(
            'error' => false,
            'message' => '',
            'user_password' => $generate_user_new_password === true ? $passwordClear : '',
        ),
        'encode'
    );
}

/**
 * Permits to generate a new password for a user
 *
 * @param integer $processId
 * @param integer $nbItemsToTreat
 * @return void
 
 */
function createUserTasks($processId, $nbItemsToTreat): void
{
    // Create subtask for step 0
    DB::insert(
        prefixTable('background_subtasks'),
        array(
            'task_id' => $processId,
            'created_at' => time(),
            'task' => json_encode([
                'step' => 'step0',
                'index' => 0,
                'nb' => $nbItemsToTreat,
            ]),
        )
    );

    // Prepare the subtask queries
    $queries = [
        'step20' => 'SELECT * FROM ' . prefixTable('items'),

        'step30' => 'SELECT * FROM ' . prefixTable('log_items') . 
                    ' WHERE raison LIKE "at_pw :%" AND encryption_type = "teampass_aes"',

        'step40' => 'SELECT * FROM ' . prefixTable('categories_items') . 
                    ' WHERE encryption_type = "teampass_aes"',

        'step50' => 'SELECT * FROM ' . prefixTable('suggestion'),

        'step60' => 'SELECT * FROM ' . prefixTable('files') . ' AS f
                        INNER JOIN ' . prefixTable('items') . ' AS i ON i.id = f.id_item
                        WHERE f.status = "' . TP_ENCRYPTION_NAME . '"'
    ];

    // Perform loop on $queries to create sub-tasks
    foreach ($queries as $step => $query) {
        DB::query($query);
        createAllSubTasks($step, DB::count(), $nbItemsToTreat, $processId);
    }

    // Create subtask for step 99
    DB::insert(
        prefixTable('background_subtasks'),
        array(
            'task_id' => $processId,
            'created_at' => time(),
            'task' => json_encode([
                'step' => 'step99',
            ]),
        )
    );
}

/**
 * Create all subtasks for a given action
 * @param string $action The action to be performed
 * @param int $totalElements Total number of elements to process
 * @param int $elementsPerIteration Number of elements per iteration
 * @param int $taskId The ID of the task
 */
function createAllSubTasks($action, $totalElements, $elementsPerIteration, $taskId) {
    // Calculate the number of iterations
    $iterations = ceil($totalElements / $elementsPerIteration);

    // Create the subtasks
    for ($i = 0; $i < $iterations; $i++) {
        DB::insert(prefixTable('background_subtasks'), [
            'task_id' => $taskId,
            'created_at' => time(),
            'task' => json_encode([
                "step" => $action,
                "index" => $i * $elementsPerIteration,
                "nb" => $elementsPerIteration,
            ]),
        ]);
    }
}

/**
 * Permeits to check the consistency of date versus columns definition
 *
 * @param string $table
 * @param array $dataFields
 * @return array
 */
function validateDataFields(
    string $table,
    array $dataFields
): array
{
    // Get table structure
    $result = DB::query(
        "SELECT `COLUMN_NAME`, `CHARACTER_MAXIMUM_LENGTH` FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = '%l' AND TABLE_NAME = '%l';",
        DB_NAME,
        $table
    );

    foreach ($result as $row) {
        $field = $row['COLUMN_NAME'];
        $maxLength = is_null($row['CHARACTER_MAXIMUM_LENGTH']) === false ? (int) $row['CHARACTER_MAXIMUM_LENGTH'] : '';

        if (isset($dataFields[$field]) === true && is_array($dataFields[$field]) === false && empty($maxLength) === false) {
            if (strlen((string) $dataFields[$field]) > $maxLength) {
                return [
                    'state' => false,
                    'field' => $field,
                    'maxLength' => $maxLength,
                    'currentLength' => strlen((string) $dataFields[$field]),
                ];
            }
        }
    }
    
    return [
        'state' => true,
        'message' => '',
    ];
}

/**
 * Adapt special characters sanitized during filter_var with option FILTER_SANITIZE_SPECIAL_CHARS operation
 *
 * @param string $string
 * @return string
 */
function filterVarBack(string $string): string
{
    $arr = [
        '&#060;' => '<',
        '&#062;' => '>',
        '&#034;' => '"',
        '&#039;' => "'",
        '&#038;' => '&',
    ];

    foreach ($arr as $key => $value) {
        $string = str_replace($key, $value, $string);
    }

    return $string;
}

/**
 * 
 */
function storeTask(
    string $taskName,
    int $user_id,
    int $is_personal_folder,
    int $folder_destination_id,
    int $item_id,
    string $object_keys,
    array $fields_keys = [],
    array $files_keys = []
)
{
    if (in_array($taskName, ['item_copy', 'new_item', 'update_item'])) {
        // Create process
        DB::insert(
            prefixTable('background_tasks'),
            array(
                'created_at' => time(),
                'process_type' => $taskName,
                'arguments' => json_encode([
                    'item_id' => $item_id,
                    'object_key' => $object_keys,
                ]),
                'item_id' => $item_id,
            )
        );
        $processId = DB::insertId();

        // Create tasks
        // 1- Create password sharekeys for users of this new ITEM
        DB::insert(
            prefixTable('background_subtasks'),
            array(
                'task_id' => $processId,
                'created_at' => time(),
                'task' => json_encode([
                    'step' => 'create_users_pwd_key',
                    'index' => 0,
                ]),
            )
        );

        // 2- Create fields sharekeys for users of this new ITEM
        DB::insert(
            prefixTable('background_subtasks'),
            array(
                'task_id' => $processId,
                'created_at' => time(),
                'task' => json_encode([
                    'step' => 'create_users_fields_key',
                    'index' => 0,
                    'fields_keys' => $fields_keys,
                ]),
            )
        );

        // 3- Create files sharekeys for users of this new ITEM
        DB::insert(
            prefixTable('background_subtasks'),
            array(
                'task_id' => $processId,
                'created_at' => time(),
                'task' => json_encode([
                    'step' => 'create_users_files_key',
                    'index' => 0,
                    'files_keys' => $files_keys,
                ]),
            )
        );
    }
}

/**
 * 
 */
function createTaskForItem(
    string $processType,
    string|array $taskName,
    int $itemId,
    int $userId,
    string $objectKey,
    int $parentId = -1,
    array $fields_keys = [],
    array $files_keys = []
)
{
    // 1- Create main process
    // ---
    
    // Create process
    DB::insert(
        prefixTable('background_tasks'),
        array(
            'created_at' => time(),
            'process_type' => $processType,
            'arguments' => json_encode([
                'all_users_except_id' => (int) $userId,
                'item_id' => (int) $itemId,
                'object_key' => $objectKey,
                'author' => (int) $userId,
            ]),
            'item_id' => (int) $parentId !== -1 ?  $parentId : null,
        )
    );
    $processId = DB::insertId();

    // 2- Create expected tasks
    // ---
    if (is_array($taskName) === false) {
        $taskName = [$taskName];
    }
    foreach($taskName as $task) {
        if (WIP === true) error_log('createTaskForItem - task: '.$task);
        switch ($task) {
            case 'item_password':
                
                DB::insert(
                    prefixTable('background_subtasks'),
                    array(
                        'task_id' => $processId,
                        'created_at' => time(),
                        'task' => json_encode([
                            'step' => 'create_users_pwd_key',
                            'index' => 0,
                        ]),
                    )
                );

                break;
            case 'item_field':
                
                DB::insert(
                    prefixTable('background_subtasks'),
                    array(
                        'task_id' => $processId,
                        'created_at' => time(),
                        'task' => json_encode([
                            'step' => 'create_users_fields_key',
                            'index' => 0,
                            'fields_keys' => $fields_keys,
                        ]),
                    )
                );

                break;
            case 'item_file':

                DB::insert(
                    prefixTable('background_subtasks'),
                    array(
                        'task_id' => $processId,
                        'created_at' => time(),
                        'task' => json_encode([
                            'step' => 'create_users_files_key',
                            'index' => 0,
                            'fields_keys' => $files_keys,
                        ]),
                    )
                );
                break;
            default:
                # code...
                break;
        }
    }
}


function deleteProcessAndRelatedTasks(int $processId)
{
    // Delete process
    DB::delete(
        prefixTable('background_tasks'),
        'id=%i',
        $processId
    );

    // Delete tasks
    DB::delete(
        prefixTable('background_subtasks'),
        'task_id=%i',
        $processId
    );

}

/**
 * Return PHP binary path
 *
 * @return string
 */
function getPHPBinary(): string
{
    // Get PHP binary path
    $phpBinaryFinder = new PhpExecutableFinder();
    $phpBinaryPath = $phpBinaryFinder->find();
    return $phpBinaryPath === false ? 'false' : $phpBinaryPath;
}



/**
 * Delete unnecessary keys for personal items
 *
 * @param boolean $allUsers
 * @param integer $user_id
 * @return void
 */
function purgeUnnecessaryKeys(bool $allUsers = true, int $user_id=0)
{
    if ($allUsers === true) {
        // Load class DB
        if (class_exists('DB') === false) {
            loadClasses('DB');
        }

        $users = DB::query(
            'SELECT id
            FROM ' . prefixTable('users') . '
            WHERE id NOT IN ('.OTV_USER_ID.', '.TP_USER_ID.', '.SSH_USER_ID.', '.API_USER_ID.')
            ORDER BY login ASC'
        );
        foreach ($users as $user) {
            purgeUnnecessaryKeysForUser((int) $user['id']);
        }
    } else {
        purgeUnnecessaryKeysForUser((int) $user_id);
    }
}

/**
 * Delete unnecessary keys for personal items
 *
 * @param integer $user_id
 * @return void
 */
function purgeUnnecessaryKeysForUser(int $user_id=0)
{
    if ($user_id === 0) {
        return;
    }

    // Load class DB
    loadClasses('DB');

    $personalItems = DB::queryFirstColumn(
        'SELECT id
        FROM ' . prefixTable('items') . ' AS i
        INNER JOIN ' . prefixTable('log_items') . ' AS li ON li.id_item = i.id
        WHERE i.perso = 1 AND li.action = "at_creation" AND li.id_user IN (%i, '.TP_USER_ID.')',
        $user_id
    );
    if (count($personalItems) > 0) {
        // Item keys
        DB::delete(
            prefixTable('sharekeys_items'),
            'object_id IN %li AND user_id NOT IN %ls',
            $personalItems,
            [$user_id, TP_USER_ID, API_USER_ID, OTV_USER_ID,SSH_USER_ID]
        );
        // Files keys
        DB::delete(
            prefixTable('sharekeys_files'),
            'object_id IN %li AND user_id NOT IN %ls',
            $personalItems,
            [$user_id, TP_USER_ID, API_USER_ID, OTV_USER_ID,SSH_USER_ID]
        );
        // Fields keys
        DB::delete(
            prefixTable('sharekeys_fields'),
            'object_id IN %li AND user_id NOT IN %ls',
            $personalItems,
            [$user_id, TP_USER_ID, API_USER_ID, OTV_USER_ID,SSH_USER_ID]
        );
        // Logs keys
        DB::delete(
            prefixTable('sharekeys_logs'),
            'object_id IN %li AND user_id NOT IN %ls',
            $personalItems,
            [$user_id, TP_USER_ID, API_USER_ID, OTV_USER_ID,SSH_USER_ID]
        );
    }
}

/**
 * Generate recovery keys file
 *
 * @param integer $userId
 * @param array $SETTINGS
 * @return string
 */
function handleUserRecoveryKeysDownload(int $userId, array $SETTINGS):string
{
    $session = SessionManager::getSession();
    // Check if user exists
    $userInfo = DB::queryFirstRow(
        'SELECT login
        FROM ' . prefixTable('users') . '
        WHERE id = %i',
        $userId
    );

    if (DB::count() > 0) {
        $now = (int) time();
        // Prepare file content
        $export_value = file_get_contents(__DIR__."/../includes/core/teampass_ascii.txt")."\n".
            "Generation date: ".date($SETTINGS['date_format'] . ' ' . $SETTINGS['time_format'], $now)."\n\n".
            "RECOVERY KEYS - Not to be shared - To be store safely\n\n".
            "Public Key:\n".$session->get('user-public_key')."\n\n".
            "Private Key:\n".$session->get('user-private_key')."\n\n";

        // Update user's keys_recovery_time
        DB::update(
            prefixTable('users'),
            [
                'keys_recovery_time' => $now,
            ],
            'id=%i',
            $userId
        );
        $session->set('user-keys_recovery_time', $now);

        //Log into DB the user's disconnection
        logEvents($SETTINGS, 'user_mngt', 'at_user_keys_download', (string) $userId, $userInfo['login']);
        
        // Return data
        return prepareExchangedData(
            array(
                'error' => false,
                'datetime' => date($SETTINGS['date_format'] . ' ' . $SETTINGS['time_format'], $now),
                'timestamp' => $now,
                'content' => base64_encode($export_value),
                'login' => $userInfo['login'],
            ),
            'encode'
        );
    }

    return prepareExchangedData(
        array(
            'error' => true,
            'datetime' => '',
        ),
        'encode'
    );
}

/**
 * Permits to load expected classes
 *
 * @param string $className
 * @return void
 */
function loadClasses(string $className = ''): void
{
    require_once __DIR__. '/../includes/config/include.php';
    require_once __DIR__. '/../includes/config/settings.php';
    require_once __DIR__.'/../vendor/autoload.php';

    if (defined('DB_PASSWD_CLEAR') === false) {
        define('DB_PASSWD_CLEAR', defuseReturnDecrypted(DB_PASSWD));
    }

    if (empty($className) === false) {
        // Load class DB
        if ((string) $className === 'DB') {
            //Connect to DB
            DB::$host = DB_HOST;
            DB::$user = DB_USER;
            DB::$password = DB_PASSWD_CLEAR;
            DB::$dbName = DB_NAME;
            DB::$port = DB_PORT;
            DB::$encoding = DB_ENCODING;
            DB::$ssl = DB_SSL;
            DB::$connect_options = DB_CONNECT_OPTIONS;
        }
    }
}

/**
 * Returns the page the user is visiting.
 *
 * @return string The page name
 */
function getCurrectPage($SETTINGS)
{
    
    $request = SymfonyRequest::createFromGlobals();

    // Parse the url
    parse_str(
        substr(
            (string) $request->getRequestUri(),
            strpos((string) $request->getRequestUri(), '?') + 1
        ),
        $result
    );

    return $result['page'];
}

/**
 * Permits to return value if set
 *
 * @param string|int $value
 * @param string|int|null $retFalse
 * @param string|int $retTrue
 * @return mixed
 */
function returnIfSet($value, $retFalse = '', $retTrue = null): mixed
{
    if (!empty($value)) {
        return is_null($retTrue) ? $value : $retTrue;
    }
    return $retFalse;
}


/**
 * SEnd email to user
 *
 * @param string $post_receipt
 * @param string $post_body
 * @param string $post_subject
 * @param array $post_replace
 * @param boolean $immediate_email
 * @param string $encryptedUserPassword
 * @return string
 */
function sendMailToUser(
    string $post_receipt,
    string $post_body,
    string $post_subject,
    array $post_replace,
    bool $immediate_email = false,
    $encryptedUserPassword = ''
): ?string {
    global $SETTINGS;
    $emailSettings = new EmailSettings($SETTINGS);
    $emailService = new EmailService();
    $antiXss = new AntiXSS();

    // Sanitize inputs
    $post_receipt = filter_var($post_receipt, FILTER_SANITIZE_EMAIL);
    $post_subject = $antiXss->xss_clean($post_subject);
    $post_body = $antiXss->xss_clean($post_body);

    if (count($post_replace) > 0) {
        $post_body = str_replace(
            array_keys($post_replace),
            array_values($post_replace),
            $post_body
        );
    }

    // Remove newlines to prevent header injection
    $post_body = str_replace(array("\r", "\n"), '', $post_body);    

    if ($immediate_email === true) {
        // Send email
        $ret = $emailService->sendMail(
            $post_subject,
            $post_body,
            $post_receipt,
            $emailSettings,
            '',
            false
        );
    
        $ret = json_decode($ret, true);
    
        return prepareExchangedData(
            array(
                'error' => empty($ret['error']) === true ? false : true,
                'message' => $ret['message'],
            ),
            'encode'
        );
    } else {
        // Send through task handler
        prepareSendingEmail(
            $post_subject,
            $post_body,
            $post_receipt,
            "",
            $encryptedUserPassword,
        );
    }

    return null;
}

/**
 * Converts a password strengh value to zxcvbn level
 * 
 * @param integer $passwordStrength
 * 
 * @return integer
 */
function convertPasswordStrength($passwordStrength): int
{
    if ($passwordStrength === 0) {
        return TP_PW_STRENGTH_1;
    } else if ($passwordStrength === 1) {
        return TP_PW_STRENGTH_2;
    } else if ($passwordStrength === 2) {
        return TP_PW_STRENGTH_3;
    } else if ($passwordStrength === 3) {
        return TP_PW_STRENGTH_4;
    } else {
        return TP_PW_STRENGTH_5;
    }
}

/**
 * Check that a password is strong. The password needs to have at least :
 *   - length >= 10.
 *   - Uppercase and lowercase chars.
 *   - Number or special char.
 *   - Not contain username, name or mail part.
 *   - Different from previous password.
 * 
 * @param string $password - Password to ckeck.
 * @return bool - true if the password is strong, false otherwise.
 */
function isPasswordStrong($password) {
    $session = SessionManager::getSession();

    // Password can't contain login, name or lastname
    $forbiddenWords = [
        $session->get('user-login'),
        $session->get('user-name'),
        $session->get('user-lastname'),
    ];

    // Cut out the email
    if ($email = $session->get('user-email')) {
        $emailParts = explode('@', $email);

        if (count($emailParts) === 2) {
            // Mail username (removed @domain.tld)
            $forbiddenWords[] = $emailParts[0];

            // Organisation name (removed username@ and .tld)
            $domain = explode('.', $emailParts[1]);
            if (count($domain) > 1)
                $forbiddenWords[] = $domain[0];
        }
    }

    // Search forbidden words in password
    foreach ($forbiddenWords as $word) {
        if (empty($word))
            continue;

        // Stop if forbidden word found in password
        if (stripos($password, $word) !== false)
            return false;
    }

    // Get password complexity
    $length = strlen($password);
    $hasUppercase = preg_match('/[A-Z]/', $password);
    $hasLowercase = preg_match('/[a-z]/', $password);
    $hasNumber = preg_match('/[0-9]/', $password);
    $hasSpecialChar = preg_match('/[\W_]/', $password);

    // Get current user hash
    $userHash = DB::queryFirstRow(
        "SELECT pw FROM " . prefixtable('users') . " WHERE id = %d;",
        $session->get('user-id')
    )['pw'];

    $passwordManager = new PasswordManager();
    
    return $length >= 8
           && $hasUppercase
           && $hasLowercase
           && ($hasNumber || $hasSpecialChar)
           && !$passwordManager->verifyPassword($userHash, $password);
}


/**
 * Converts a value to a string, handling various types and cases.
 *
 * @param mixed $value La valeur à convertir
 * @param string $default Valeur par défaut si la conversion n'est pas possible
 * @return string
 */
function safeString($value, string $default = ''): string
{
    // Simple cases
    if (is_string($value)) {
        return $value;
    }
    
    if (is_scalar($value)) {
        return (string) $value;
    }
    
    // Special cases
    if (is_null($value)) {
        return $default;
    }
    
    if (is_array($value)) {
        return empty($value) ? $default : json_encode($value, JSON_UNESCAPED_UNICODE);
    }
    
    if (is_object($value)) {
        // Vérifie si l'objet implémente __toString()
        if (method_exists($value, '__toString')) {
            return (string) $value;
        }
        
        // Alternative: serialize ou json selon le contexte
        return get_class($value) . (method_exists($value, 'getId') ? '#' . $value->getId() : '');
    }
    
    if (is_resource($value)) {
        return 'Resource#' . get_resource_id($value) . ' of type ' . get_resource_type($value);
    }
    
    // Cas par défaut
    return $default;
}

/**
 * Check if a user has access to a file
 *
 * @param integer $userId
 * @param integer $fileId
 * @return boolean
 */
function userHasAccessToFile(int $userId, int $fileId): bool
{
    // Check if user is admin
    // Refuse access if user does not exist and/or is admin
    $user = DB::queryFirstRow(
        'SELECT admin
        FROM ' . prefixTable('users') . '
        WHERE id = %i',
        $userId
    );
    if (DB::count() === 0 || (int) $user['admin'] === 1) {
        return false;
    }

    // Get file info
    $file = DB::queryFirstRow(
        'SELECT f.id_item, i.id_tree
        FROM ' . prefixTable('files') . ' as f
        INNER JOIN ' . prefixTable('items') . ' AS i ON i.id = f.id_item
        WHERE f.id = %i',
        $fileId
    );
    if (DB::count() === 0) {
        return false;
    }

    // Check if user has access to the item
    include_once __DIR__. '/items.queries.php';
    $itemAccess = getCurrentAccessRights(
        (int) filter_var($userId, FILTER_SANITIZE_NUMBER_INT),
        (int) filter_var($file['id_item'], FILTER_SANITIZE_NUMBER_INT),
        (int) filter_var($file['id_tree'], FILTER_SANITIZE_NUMBER_INT),
        (string) filter_var('show', FILTER_SANITIZE_SPECIAL_CHARS),
    );

    return $itemAccess['access'] === true;
}

/**
 * Check if a user has access to a backup file
 * 
 * @param integer $userId
 * @param string $file
 * @param string $key
 * @param string $keyTmp
 * @return boolean
 */
function userHasAccessToBackupFile(int $userId, string $file, string $key, string $keyTmp): bool
{
    $session = SessionManager::getSession();

    // Ensure session keys are ok
    if ($session->get('key') !== $key || $session->get('user-key_tmp') !== $keyTmp) {
        return false;
    }
    
    // Check if user is admin
    // Refuse access if user does not exist and/or is not admin
    $user = DB::queryFirstRow(
        'SELECT admin
        FROM ' . prefixTable('users') . '
        WHERE id = %i',
        $userId
    );
    if (DB::count() === 0 || (int) $user['admin'] === 0) {
        return false;
    }
    
    // Ensure that user has performed the backup
    DB::queryFirstRow(
        'SELECT f.id
        FROM ' . prefixTable('log_system') . ' as f
        WHERE f.type = %s AND f.label = %s AND f.qui = %i AND f.field_1 = %s',
        'admin_action',
        'dataBase backup',
        $userId,
        $file
    );
    if (DB::count() === 0) {
        return false;
    }

    return true;
}

/**
 * Ensure that personal items have only keys for their owner
 *
 * @param integer $userId
 * @param integer $itemId
 * @return boolean
 */
function EnsurePersonalItemHasOnlyKeysForOwner(int $userId, int $itemId): bool
{
    // Check if user is admin
    // Refuse access if user does not exist and/or is admin
    $user = DB::queryFirstRow(
        'SELECT admin
        FROM ' . prefixTable('users') . '
        WHERE id = %i',
        $userId
    );
    if (DB::count() === 0 || (int) $user['admin'] === 1) {
        return false;
    }

    // Get item info
    $item = DB::queryFirstRow(
        'SELECT i.perso, i.id_tree
        FROM ' . prefixTable('items') . ' as i
        WHERE i.id = %i',
        $itemId
    );
    if (DB::count() === 0 || (int) $item['perso'] === 0) {
        return false;
    }

    // Get item owner
    $itemOwner = DB::queryFirstRow(
        'SELECT li.id_user
        FROM ' . prefixTable('log_items') . ' as li
        WHERE li.id_item = %i AND li.action = %s',
        $itemId,
        'at_creation'
    );
    if (DB::count() === 0 || (int) $itemOwner['id_user'] !== $userId) {
        return false;
    }

    // Delete all keys for this item except for the owner and TeamPass system user
    DB::delete(
        prefixTable('sharekeys_items'),
        'object_id = %i AND user_id NOT IN %ls',
        $itemId,
        [$userId, TP_USER_ID, API_USER_ID, OTV_USER_ID,SSH_USER_ID]
    );
    DB::delete(
        prefixTable('sharekeys_files'),
        'object_id IN (SELECT id FROM '.prefixTable('files').' WHERE id_item = %i) AND user_id NOT IN %ls',
        $itemId,
        [$userId, TP_USER_ID, API_USER_ID, OTV_USER_ID,SSH_USER_ID]
    );
    DB::delete(
        prefixTable('sharekeys_fields'),
        'object_id IN (SELECT id FROM '.prefixTable('fields').' WHERE id_item = %i) AND user_id NOT IN %ls',
        $itemId,
        [$userId, TP_USER_ID, API_USER_ID, OTV_USER_ID,SSH_USER_ID]
    );
    DB::delete(
        prefixTable('sharekeys_logs'),
        'object_id IN (SELECT id FROM '.prefixTable('log_items').' WHERE id_item = %i) AND user_id NOT IN %ls',
        $itemId,
        [$userId, TP_USER_ID, API_USER_ID, OTV_USER_ID,SSH_USER_ID]
    );

    return true;
}

/**
 * Insert a new record in a table with an "is_current" flag.
 * This function ensures that only one record per user has the "is_current" flag set to true.
 * 
 * @param int $userId The ID of the user.
 * @param string $privateKey The private key to be inserted.
 * @return void
 */
function insertPrivateKeyWithCurrentFlag(int $userId, string $privateKey) {    
    try {
        DB::startTransaction();
        
        // Disable is_current for existing records of the user
        DB::update(
            prefixTable('user_private_keys'),
            array('is_current' => false),
            "user_id = %i AND is_current = %i",
            $userId,
            true
        );
        
        // Insert the new record
        DB::insert(
            prefixTable('user_private_keys'),
            array(
                'user_id' => $userId,
                'private_key' => $privateKey,
                'is_current' => true,
            )
        );
        
        DB::commit();
        
    } catch (Exception $e) {
        DB::rollback();
        throw $e;
    }
}

/**
 * Gets transparent recovery statistics for monitoring.
 *
 * @param array $SETTINGS Teampass settings
 *
 * @return array Statistics data
 */
function getTransparentRecoveryStats(array $SETTINGS): array
{
    // Count auto-recoveries in last 24h
    $autoRecoveriesLast24h = DB::queryFirstField(
        'SELECT COUNT(*) FROM ' . prefixTable('log_system') . '
         WHERE label = %s
         AND date > %i',
        'auto_reencryption_success',
        time() - 86400
    );

    // Count failed recoveries (all time)
    $failedRecoveries = DB::queryFirstField(
        'SELECT COUNT(*) FROM ' . prefixTable('log_system') . '
         WHERE label = %s',
        'auto_reencryption_failed'
    );

    // Count critical failures (all time)
    $criticalFailures = DB::queryFirstField(
        'SELECT COUNT(*) FROM ' . prefixTable('log_system') . '
         WHERE label = %s',
        'auto_reencryption_critical_failure'
    );

    // Count users with transparent recovery enabled (have seed and backup)
    $usersMigrated = DB::queryFirstField(
        'SELECT COUNT(*) FROM ' . prefixTable('users') . '
         WHERE user_derivation_seed IS NOT NULL
         AND private_key_backup IS NOT NULL
         AND disabled = 0'
    );

    // Count total active users
    $totalUsers = DB::queryFirstField(
        'SELECT COUNT(*) FROM ' . prefixTable('users') . '
         WHERE disabled = 0
         AND private_key IS NOT NULL
         AND private_key != "none"'
    );

    // Get recent recovery events (last 10)
    $recentEvents = DB::query(
        'SELECT l.date, l.label, l.qui, u.login
         FROM ' . prefixTable('log_system') . ' AS l
         INNER JOIN ' . prefixTable('users') . ' AS u ON u.id = l.qui
         WHERE l.label IN %ls
         ORDER BY l.date DESC
         LIMIT 10',
        ['auto_reencryption_success', 'auto_reencryption_failed', 'auto_reencryption_critical_failure']
    );

    // Calculate migration percentage
    $migrationPercentage = $totalUsers > 0 ? round(($usersMigrated / $totalUsers) * 100, 2) : 0;

    // Calculate failure rate (last 30 days)
    $totalAttempts30d = DB::queryFirstField(
        'SELECT COUNT(*) FROM ' . prefixTable('log_system') . '
         WHERE label IN %ls
         AND date > %i',
        ['auto_reencryption_success', 'auto_reencryption_failed'],
        time() - (30 * 86400)
    );

    $failures30d = DB::queryFirstField(
        'SELECT COUNT(*) FROM ' . prefixTable('log_system') . '
         WHERE label = %s
         AND date > %i',
        'auto_reencryption_failed',
        time() - (30 * 86400)
    );

    $failureRate = $totalAttempts30d > 0 ? round(($failures30d / $totalAttempts30d) * 100, 2) : 0;

    return [
        'auto_recoveries_last_24h' => (int) $autoRecoveriesLast24h,
        'failed_recoveries_total' => (int) $failedRecoveries,
        'critical_failures_total' => (int) $criticalFailures,
        'users_migrated' => (int) $usersMigrated,
        'total_users' => (int) $totalUsers,
        'migration_percentage' => $migrationPercentage,
        'failure_rate_30d' => $failureRate,
        'recent_events' => $recentEvents,
    ];
}