rcube.php
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rcube.php
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	<?php

	/**
	+-----------------------------------------------------------------------+
	\| This file is part of the Roundcube Webmail client \|
	\| \|
	\| Copyright (C) The Roundcube Dev Team \|
	\| Copyright (C) Kolab Systems AG \|
	\| \|
	\| Licensed under the GNU General Public License version 3 or \|
	\| any later version with exceptions for skins & plugins. \|
	\| See the README file for a full license statement. \|
	\| \|
	\| PURPOSE: \|
	\| Framework base class providing core functions and holding \|
	\| instances of all 'global' objects like db- and storage-connections \|
	+-----------------------------------------------------------------------+
	\| Author: Thomas Bruederli <roundcube@gmail.com> \|
	+-----------------------------------------------------------------------+
	*/

	/**
	* Base class of the Roundcube Framework
	* implemented as singleton
	*
	* @package Framework
	* @subpackage Core
	*/
	class rcube
	{
	// Init options
	const INIT_WITH_DB = 1;
	const INIT_WITH_PLUGINS = 2;

	// Request status
	const REQUEST_VALID = 0;
	const REQUEST_ERROR_URL = 1;
	const REQUEST_ERROR_TOKEN = 2;

	const DEBUG_LINE_LENGTH = 4096;

	/** @var rcube_config Stores instance of rcube_config */
	public $config;

	/** @var rcube_db Instance of database class */
	public $db;

	/** @var Memcache Instance of Memcache class */
	public $memcache;

	/** @var Memcached Instance of Memcached class */
	public $memcached;

	/** @var Redis Instance of Redis class */
	public $redis;

	/** @var rcube_session Instance of rcube_session class */
	public $session;

	/** @var rcube_smtp Instance of rcube_smtp class */
	public $smtp;

	/** @var rcube_storage Instance of rcube_storage class */
	public $storage;

	/** @var rcube_output Instance of rcube_output class */
	public $output;

	/** @var rcube_plugin_api Instance of rcube_plugin_api */
	public $plugins;

	/** @var rcube_user Instance of rcube_user class */
	public $user;

	/** @var int Request status */
	public $request_status = 0;

	/** @var array Localization */
	protected $texts;

	/** @var rcube_cache[] Initialized cache objects */
	protected $caches = [];

	/** @var array Registered shutdown functions */
	protected $shutdown_functions = [];

	/** @var rcube Singleton instance of rcube */
	static protected $instance;


	/**
	* This implements the 'singleton' design pattern
	*
	* @param int $mode Options to initialize with this instance. See rcube::INIT_WITH_* constants
	* @param string $env Environment name to run (e.g. live, dev, test)
	*
	* @return rcube The one and only instance
	*/
	static function get_instance($mode = 0, $env = '')
	{
	if (!self::$instance) {
	self::$instance = new rcube($env);
	self::$instance->init($mode);
	}

	return self::$instance;
	}

	/**
	* Private constructor
	*
	* @param string $env Environment name to run (e.g. live, dev, test)
	*/
	protected function __construct($env = '')
	{
	// load configuration
	$this->config = new rcube_config($env);
	$this->plugins = new rcube_dummy_plugin_api;

	register_shutdown_function([$this, 'shutdown']);
	}

	/**
	* Initial startup function
	*
	* @param int $mode Options to initialize with this instance. See rcube::INIT_WITH_* constants
	*/
	protected function init($mode = 0)
	{
	// initialize syslog
	if ($this->config->get('log_driver') == 'syslog') {
	$syslog_id = $this->config->get('syslog_id', 'roundcube');
	$syslog_facility = $this->config->get('syslog_facility', LOG_USER);
	openlog($syslog_id, LOG_ODELAY, $syslog_facility);
	}

	// connect to database
	if ($mode & self::INIT_WITH_DB) {
	$this->get_dbh();
	}

	// create plugin API and load plugins
	if ($mode & self::INIT_WITH_PLUGINS) {
	$this->plugins = rcube_plugin_api::get_instance();
	}
	}

	/**
	* Get the current database connection
	*
	* @return rcube_db Database object
	*/
	public function get_dbh()
	{
	if (!$this->db) {
	$this->db = rcube_db::factory(
	$this->config->get('db_dsnw'),
	$this->config->get('db_dsnr'),
	$this->config->get('db_persistent')
	);

	$this->db->set_debug((bool)$this->config->get('sql_debug'));
	}

	return $this->db;
	}

	/**
	* Get global handle for memcache access
	*
	* @return Memcache The memcache engine
	*/
	public function get_memcache()
	{
	if (!isset($this->memcache)) {
	$this->memcache = rcube_cache_memcache::engine();
	}

	return $this->memcache;
	}

	/**
	* Get global handle for memcached access
	*
	* @return Memcached The memcached engine
	*/
	public function get_memcached()
	{
	if (!isset($this->memcached)) {
	$this->memcached = rcube_cache_memcached::engine();
	}

	return $this->memcached;
	}

	/**
	* Get global handle for redis access
	*
	* @return Redis The redis engine
	*/
	public function get_redis()
	{
	if (!isset($this->redis)) {
	$this->redis = rcube_cache_redis::engine();
	}

	return $this->redis;
	}

	/**
	* Initialize and get user cache object
	*
	* @param string $name Cache identifier
	* @param string $type Cache type ('db', 'apc', 'memcache', 'redis')
	* @param string $ttl Expiration time for cache items
	* @param bool $packed Enables/disables data serialization
	* @param bool $indexed Use indexed cache
	*
	* @return rcube_cache\|null User cache object
	*/
	public function get_cache($name, $type = 'db', $ttl = 0, $packed = true, $indexed = false)
	{
	if (!isset($this->caches[$name]) && ($userid = $this->get_user_id())) {
	$this->caches[$name] = rcube_cache::factory($type, $userid, $name, $ttl, $packed, $indexed);
	}

	return $this->caches[$name] ?? null;
	}

	/**
	* Initialize and get shared cache object
	*
	* @param string $name Cache identifier
	* @param bool $packed Enables/disables data serialization
	*
	* @return rcube_cache Shared cache object
	*/
	public function get_cache_shared($name, $packed = true)
	{
	$shared_name = "shared_$name";

	if (!array_key_exists($shared_name, $this->caches)) {
	$opt = strtolower($name) . '_cache';
	$type = $this->config->get($opt);
	$ttl = $this->config->get($opt . '_ttl');

	if (!$type) {
	// cache is disabled
	return $this->caches[$shared_name] = null;
	}

	if ($ttl === null) {
	$ttl = $this->config->get('shared_cache_ttl', '10d');
	}

	$this->caches[$shared_name] = rcube_cache::factory($type, null, $name, $ttl, $packed);
	}

	return $this->caches[$shared_name];
	}

	/**
	* Initialize HTTP client
	*
	* @param array $options Configuration options
	*
	* @return \GuzzleHttp\Client HTTP client
	*/
	public function get_http_client($options = [])
	{
	return new \GuzzleHttp\Client($options + $this->config->get('http_client'));
	}

	/**
	* Create SMTP object and connect to server
	*
	* @param bool $connect True if connection should be established
	*/
	public function smtp_init($connect = false)
	{
	$this->smtp = new rcube_smtp();

	if ($connect) {
	$this->smtp->connect();
	}
	}

	/**
	* Initialize and get storage object
	*
	* @return rcube_storage Storage object
	*/
	public function get_storage()
	{
	// already initialized
	if (!is_object($this->storage)) {
	$this->storage_init();
	}

	return $this->storage;
	}

	/**
	* Initialize storage object
	*/
	public function storage_init()
	{
	// already initialized
	if (is_object($this->storage)) {
	return;
	}

	$driver = $this->config->get('storage_driver', 'imap');
	$driver_class = "rcube_{$driver}";

	if (!class_exists($driver_class)) {
	self::raise_error([
	'code' => 700, 'file' => __FILE__, 'line' => __LINE__,
	'message' => "Storage driver class ($driver) not found!"
	],
	true, true
	);
	}

	// Initialize storage object
	$this->storage = new $driver_class;

	// set class options
	$options = [
	'auth_type' => $this->config->get("{$driver}_auth_type", 'check'),
	'auth_cid' => $this->config->get("{$driver}_auth_cid"),
	'auth_pw' => $this->config->get("{$driver}_auth_pw"),
	'debug' => (bool) $this->config->get("{$driver}_debug"),
	'force_caps' => (bool) $this->config->get("{$driver}_force_caps"),
	'disabled_caps' => $this->config->get("{$driver}_disabled_caps"),
	'socket_options' => $this->config->get("{$driver}_conn_options"),
	'timeout' => (int) $this->config->get("{$driver}_timeout"),
	'skip_deleted' => (bool) $this->config->get('skip_deleted'),
	'driver' => $driver,
	];

	if (!empty($_SESSION['storage_host'])) {
	$options['language'] = $_SESSION['language'];
	$options['host'] = $_SESSION['storage_host'];
	$options['user'] = $_SESSION['username'];
	$options['port'] = $_SESSION['storage_port'];
	$options['ssl'] = $_SESSION['storage_ssl'];
	$options['password'] = $this->decrypt($_SESSION['password']);
	$_SESSION[$driver.'_host'] = $_SESSION['storage_host'];
	}

	$options = $this->plugins->exec_hook("storage_init", $options);

	// for backward compat. (deprecated, to be removed)
	$options = $this->plugins->exec_hook("imap_init", $options);

	$this->storage->set_options($options);
	$this->set_storage_prop();

	// subscribe to 'storage_connected' hook for session logging
	if ($this->config->get('imap_log_session', false)) {
	$this->plugins->register_hook('storage_connected', [$this, 'storage_log_session']);
	}
	}

	/**
	* Set storage parameters.
	*/
	protected function set_storage_prop()
	{
	$storage = $this->get_storage();

	// set pagesize from config
	$pagesize = $this->config->get('mail_pagesize');
	if (!$pagesize) {
	$pagesize = $this->config->get('pagesize', 50);
	}

	$storage->set_pagesize($pagesize);
	$storage->set_charset($this->config->get('default_charset', RCUBE_CHARSET));

	// enable caching of mail data
	$driver = $this->config->get('storage_driver', 'imap');
	$storage_cache = $this->config->get("{$driver}_cache");
	$messages_cache = $this->config->get('messages_cache');

	// for backward compatibility
	if ($storage_cache === null && $messages_cache === null && $this->config->get('enable_caching')) {
	$storage_cache = 'db';
	$messages_cache = true;
	}

	if ($storage_cache) {
	$storage->set_caching($storage_cache);
	}

	if ($messages_cache) {
	$storage->set_messages_caching(true);
	}
	}

	/**
	* Set special folders type association.
	* This must be done AFTER connecting to the server!
	*/
	protected function set_special_folders()
	{
	$storage = $this->get_storage();
	$folders = $storage->get_special_folders(true);
	$prefs = [];

	// check SPECIAL-USE flags on IMAP folders
	foreach ($folders as $type => $folder) {
	$idx = $type . '_mbox';
	if ($folder !== $this->config->get($idx)) {
	$prefs[$idx] = $folder;
	}
	}

	// Some special folders differ, update user preferences
	if (!empty($prefs) && $this->user) {
	$this->user->save_prefs($prefs);
	}

	// create default folders (on login)
	if ($this->config->get('create_default_folders')) {
	$storage->create_default_folders();
	}
	}

	/**
	* Callback for IMAP connection events to log session identifiers
	*
	* @param array $args Callback arguments
	*/
	public function storage_log_session($args)
	{
	if (!empty($args['session']) && session_id()) {
	$this->write_log('imap_session', $args['session']);
	}
	}

	/**
	* Create session object and start the session.
	*/
	public function session_init()
	{
	// Ignore in CLI mode or when session started (Installer?)
	if (empty($_SERVER['REMOTE_ADDR']) \|\| session_id()) {
	return;
	}

	$storage = $this->config->get('session_storage', 'db');
	$sess_name = $this->config->get('session_name');
	$sess_domain = $this->config->get('session_domain');
	$sess_path = $this->config->get('session_path');
	$sess_samesite = $this->config->get('session_samesite');
	$lifetime = $this->config->get('session_lifetime', 0) * 60;
	$is_secure = $this->config->get('use_https') \|\| rcube_utils::https_check();

	// set session domain
	if ($sess_domain) {
	ini_set('session.cookie_domain', $sess_domain);
	}
	// set session path
	if ($sess_path) {
	ini_set('session.cookie_path', $sess_path);
	}
	// set session samesite attribute
	if ($sess_samesite) {
	ini_set('session.cookie_samesite', $sess_samesite);
	}
	// set session garbage collecting time according to session_lifetime
	if ($lifetime) {
	ini_set('session.gc_maxlifetime', $lifetime * 2);
	}

	// set session cookie lifetime so it never expires (#5961)
	ini_set('session.cookie_lifetime', 0);
	ini_set('session.cookie_secure', $is_secure);
	ini_set('session.name', $sess_name ?: 'roundcube_sessid');
	ini_set('session.use_cookies', 1);
	ini_set('session.use_only_cookies', 1);
	ini_set('session.cookie_httponly', 1);

	// Make sure session garbage collector is enabled when using custom handlers (#6560)
	// Note: Use session.gc_divisor to control accuracy
	if ($storage != 'php' && !ini_get('session.gc_probability')) {
	ini_set('session.gc_probability', 1);
	}

	// Start the session
	$this->session = rcube_session::factory($this->config);
	$this->session->register_gc_handler([$this, 'gc']);
	$this->session->start();
	}

	/**
	* Garbage collector - cache/temp cleaner
	*/
	public function gc()
	{
	rcube_cache::gc();
	$this->get_storage()->cache_gc();
	$this->gc_temp();
	}

	/**
	* Garbage collector function for temp files.
	* Removes temporary files older than temp_dir_ttl.
	*/
	public function gc_temp()
	{
	$tmp = unslashify($this->config->get('temp_dir'));

	// expire in 48 hours by default
	$temp_dir_ttl = $this->config->get('temp_dir_ttl', '48h');
	$temp_dir_ttl = get_offset_sec($temp_dir_ttl);
	if ($temp_dir_ttl < 6*3600) {
	$temp_dir_ttl = 6*3600; // 6 hours sensible lower bound.
	}

	$expire = time() - $temp_dir_ttl;

	if ($tmp && ($dir = opendir($tmp))) {
	while (($fname = readdir($dir)) !== false) {
	if (strpos($fname, RCUBE_TEMP_FILE_PREFIX) !== 0) {
	continue;
	}

	if (@filemtime("$tmp/$fname") < $expire) {
	@unlink("$tmp/$fname");
	}
	}

	closedir($dir);
	}
	}

	/**
	* Runs garbage collector with probability based on
	* session settings. This is intended for environments
	* without a session.
	*/
	public function gc_run()
	{
	$probability = (int) ini_get('session.gc_probability');
	$divisor = (int) ini_get('session.gc_divisor');

	if ($divisor > 0 && $probability > 0) {
	$random = mt_rand(1, $divisor);
	if ($random <= $probability) {
	$this->gc();
	}
	}
	}

	/**
	* Get localized text in the desired language
	*
	* @param mixed $attrib Named parameters array or label name
	* @param string $domain Label domain (plugin) name
	*
	* @return string Localized text
	*/
	public function gettext($attrib, $domain = null)
	{
	// load localization files if not done yet
	if (empty($this->texts)) {
	$this->load_language();
	}

	// extract attributes
	if (is_string($attrib)) {
	$attrib = ['name' => $attrib];
	}

	$name = (string) $attrib['name'];

	// attrib contain text values: use them from now
	$slang = !empty($_SESSION['language']) ? strtolower($_SESSION['language']) : 'en_us';
	if (isset($attrib[$slang])) {
	$this->texts[$name] = $attrib[$slang];
	}
	else if ($slang != 'en_us' && isset($attrib['en_us'])) {
	$this->texts[$name] = $attrib['en_us'];
	}

	// check for text with domain
	if ($domain && isset($this->texts["$domain.$name"])) {
	$text = $this->texts["$domain.$name"];
	}
	else if (isset($this->texts[$name])) {
	$text = $this->texts[$name];
	}

	// text does not exist
	if (!isset($text)) {
	return "[$name]";
	}

	// replace vars in text
	if (!empty($attrib['vars']) && is_array($attrib['vars'])) {
	foreach ($attrib['vars'] as $var_key => $var_value) {
	if ($var_key[0] != '$') {
	$var_key = '$' . $var_key;
	}

	$text = str_replace($var_key, $var_value ?? '', $text);
	}
	}

	// replace \n with real line break
	$text = strtr($text, ['\n' => "\n"]);

	// case folding
	if ((!empty($attrib['uppercase']) && strtolower($attrib['uppercase']) == 'first') \|\| !empty($attrib['ucfirst'])) {
	$case_mode = MB_CASE_TITLE;
	}
	else if (!empty($attrib['uppercase'])) {
	$case_mode = MB_CASE_UPPER;
	}
	else if (!empty($attrib['lowercase'])) {
	$case_mode = MB_CASE_LOWER;
	}

	if (isset($case_mode)) {
	$text = mb_convert_case($text, $case_mode);
	}

	return $text;
	}

	/**
	* Check if the given text label exists
	*
	* @param string $name Label name
	* @param string $domain Label domain (plugin) name or '*' for all domains
	* @param string &$ref_domain Sets domain name if label is found
	*
	* @return bool True if text exists (either in the current language or in en_US)
	*/
	public function text_exists($name, $domain = null, &$ref_domain = null)
	{
	// load localization files if not done yet
	if (empty($this->texts)) {
	$this->load_language();
	}

	if (isset($this->texts[$name])) {
	$ref_domain = '';
	return true;
	}

	// any of loaded domains (plugins)
	if ($domain == '*') {
	foreach ($this->plugins->loaded_plugins() as $domain) {
	if (isset($this->texts[$domain.'.'.$name])) {
	$ref_domain = $domain;
	return true;
	}
	}
	}
	// specified domain
	else if ($domain && isset($this->texts[$domain.'.'.$name])) {
	$ref_domain = $domain;
	return true;
	}

	return false;
	}

	/**
	* Load a localization package
	*
	* @param string $lang Language ID
	* @param array $add Additional text labels/messages
	* @param array $merge Additional text labels/messages to merge
	*/
	public function load_language($lang = null, $add = [], $merge = [])
	{
	$sess_lang = !empty($_SESSION['language']) ? $_SESSION['language'] : 'en_US';
	$lang = $this->language_prop($lang ?: $sess_lang);

	// load localized texts
	if (empty($this->texts) \|\| $lang != $sess_lang) {
	// get english labels (these should be complete)
	$files = [
	RCUBE_LOCALIZATION_DIR . 'en_US/labels.inc',
	RCUBE_LOCALIZATION_DIR . 'en_US/messages.inc',
	];

	// include user language files
	if ($lang != 'en' && $lang != 'en_US' && is_dir(RCUBE_LOCALIZATION_DIR . $lang)) {
	$files[] = RCUBE_LOCALIZATION_DIR . $lang . '/labels.inc';
	$files[] = RCUBE_LOCALIZATION_DIR . $lang . '/messages.inc';
	}

	$this->texts = [];

	foreach ($files as $file) {
	$this->texts = self::read_localization_file($file, $this->texts);
	}

	$_SESSION['language'] = $lang;
	}

	// append additional texts (from plugin)
	if (is_array($add) && !empty($add)) {
	$this->texts += $add;
	}

	// merge additional texts (from plugin)
	if (is_array($merge) && !empty($merge)) {
	$this->texts = array_merge($this->texts, $merge);
	}
	}

	/**
	* Read localized texts from an additional location (plugins, skins).
	* Then you can use the result as 2nd arg to load_language().
	*
	* @param string $dir Directory to search in
	* @param string\|null $lang Language code to read
	*
	* @return array Localization labels/messages
	*/
	public function read_localization($dir, $lang = null)
	{
	if ($lang == null && isset($_SESSION)) {
	$lang = $_SESSION['language'] ?? null;
	}
	$langs = array_unique(['en_US', $lang]);
	$locdir = slashify($dir);
	$texts = [];

	// Language aliases used to find localization in similar lang, see below
	$aliases = [
	'de_CH' => 'de_DE',
	'es_AR' => 'es_ES',
	'fa_AF' => 'fa_IR',
	'nl_BE' => 'nl_NL',
	'pt_BR' => 'pt_PT',
	'zh_CN' => 'zh_TW',
	];

	foreach ($langs as $lng) {
	$fpath = $locdir . $lng . '.inc';
	$_texts = self::read_localization_file($fpath);

	if (!empty($_texts)) {
	$texts = array_merge($texts, $_texts);
	}
	// Fallback to a localization in similar language (#1488401)
	else if ($lng != 'en_US') {
	$alias = null;
	if (!empty($aliases[$lng])) {
	$alias = $aliases[$lng];
	}
	else if ($key = array_search($lng, $aliases)) {
	$alias = $key;
	}

	if (!empty($alias)) {
	$fpath = $locdir . $alias . '.inc';
	$texts = self::read_localization_file($fpath, $texts);
	}
	}
	}

	return $texts;
	}


	/**
	* Load localization file
	*
	* @param string $file File location
	* @param array $texts Additional texts to merge with
	*
	* @return array Localization labels/messages
	*/
	public static function read_localization_file($file, $texts = [])
	{
	if (is_file($file) && is_readable($file)) {
	$labels = [];
	$messages = [];

	// use buffering to handle empty lines/spaces after closing PHP tag
	ob_start();
	include $file;
	ob_end_clean();

	if (!empty($labels)) {
	$texts = array_merge($texts, $labels);
	}

	if (!empty($messages)) {
	$texts = array_merge($texts, $messages);
	}
	}

	return $texts;
	}

	/**
	* Check the given string and return a valid language code
	*
	* @param string $lang Language code
	*
	* @return string Valid language code
	*/
	protected function language_prop($lang)
	{
	static $rcube_languages, $rcube_language_aliases;

	// user HTTP_ACCEPT_LANGUAGE if no language is specified
	if ((empty($lang) \|\| $lang == 'auto') && !empty($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
	$accept_langs = explode(',', $_SERVER['HTTP_ACCEPT_LANGUAGE']);
	$lang = $accept_langs[0];

	if (preg_match('/^([a-z]+)[_-]([a-z]+)$/i', $lang, $m)) {
	$lang = $m[1] . '_' . strtoupper($m[2]);
	}
	}

	if (empty($rcube_languages)) {
	@include(RCUBE_LOCALIZATION_DIR . 'index.inc');
	}

	// check if we have an alias for that language
	if (!isset($rcube_languages[$lang]) && isset($rcube_language_aliases[$lang])) {
	$lang = $rcube_language_aliases[$lang];
	}
	// try the first two chars
	else if ($lang && !isset($rcube_languages[$lang])) {
	$short = substr($lang, 0, 2);

	// check if we have an alias for the short language code
	if (!isset($rcube_languages[$short]) && isset($rcube_language_aliases[$short])) {
	$lang = $rcube_language_aliases[$short];
	}
	// expand 'nn' to 'nn_NN'
	else if (!isset($rcube_languages[$short])) {
	$lang = $short.'_'.strtoupper($short);
	}
	}

	if (!isset($rcube_languages[$lang]) \|\| !is_dir(RCUBE_LOCALIZATION_DIR . $lang)) {
	$lang = 'en_US';
	}

	return $lang;
	}

	/**
	* Read directory program/localization and return a list of available languages
	*
	* @return array List of available localizations
	*/
	public function list_languages()
	{
	static $sa_languages = [];

	if (!count($sa_languages)) {
	@include(RCUBE_LOCALIZATION_DIR . 'index.inc');

	if ($dh = @opendir(RCUBE_LOCALIZATION_DIR)) {
	while (($name = readdir($dh)) !== false) {
	if ($name[0] == '.' \|\| !is_dir(RCUBE_LOCALIZATION_DIR . $name)) {
	continue;
	}

	if (isset($rcube_languages[$name])) {
	$sa_languages[$name] = $rcube_languages[$name];
	}
	}

	closedir($dh);
	}
	}

	return $sa_languages;
	}

	/**
	* Encrypt a string
	*
	* @param string $clear Clear text input
	* @param string $key Encryption key to retrieve from the configuration, defaults to 'des_key'
	* @param bool $base64 Whether or not to base64_encode() the result before returning
	*
	* @return string\|false Encrypted text, false on error
	*/
	public function encrypt($clear, $key = 'des_key', $base64 = true)
	{
	if (!is_string($clear) \|\| !strlen($clear)) {
	return '';
	}

	$ckey = $this->config->get_crypto_key($key);
	$method = $this->config->get_crypto_method();
	$iv = rcube_utils::random_bytes(openssl_cipher_iv_length($method), true);
	$tag = null;

	// This distinction is for PHP 7.3 which throws a warning when
	// we use $tag argument with non-AEAD cipher method here
	if (!preg_match('/-(gcm\|ccm\|poly1305)$/i', $method)) {
	$cipher = openssl_encrypt($clear, $method, $ckey, OPENSSL_RAW_DATA, $iv);
	}
	else {
	$cipher = openssl_encrypt($clear, $method, $ckey, OPENSSL_RAW_DATA, $iv, $tag);
	}

	if ($cipher === false) {
	self::raise_error([
	'file' => __FILE__,
	'line' => __LINE__,
	'message' => "Failed to encrypt data with configured cipher method: $method!"
	], true, false);

	return false;
	}

	$cipher = $iv . $cipher;

	if ($tag !== null) {
	$cipher = "##{$tag}##{$cipher}";
	}

	return $base64 ? base64_encode($cipher) : $cipher;
	}

	/**
	* Decrypt a string
	*
	* @param string $cipher Encrypted text
	* @param string $key Encryption key to retrieve from the configuration, defaults to 'des_key'
	* @param bool $base64 Whether or not input is base64-encoded
	*
	* @return string\|false Decrypted text, false on error
	*/
	public function decrypt($cipher, $key = 'des_key', $base64 = true)
	{
	// @phpstan-ignore-next-line
	if (!is_string($cipher) \|\| !strlen($cipher)) {
	return false;
	}

	if ($base64) {
	$cipher = base64_decode($cipher);
	if ($cipher === false) {
	return false;
	}
	}

	$ckey = $this->config->get_crypto_key($key);
	$method = $this->config->get_crypto_method();
	$iv_size = openssl_cipher_iv_length($method);
	$tag = null;

	if (preg_match('/^##(.{16})##/s', $cipher, $matches)) {
	$tag = $matches[1];
	$cipher = substr($cipher, strlen($matches[0]));
	}

	$iv = substr($cipher, 0, $iv_size);

	// session corruption? (#1485970)
	if (strlen($iv) < $iv_size) {
	return false;
	}

	$cipher = substr($cipher, $iv_size);
	$clear = openssl_decrypt($cipher, $method, $ckey, OPENSSL_RAW_DATA, $iv, $tag);

	return $clear;
	}

	/**
	* Returns session token for secure URLs
	*
	* @param bool $generate Generate token if not exists in session yet
	*
	* @return string\|bool Token string, False when disabled
	*/
	public function get_secure_url_token($generate = false)
	{
	if ($len = $this->config->get('use_secure_urls')) {
	if (empty($_SESSION['secure_token']) && $generate) {
	// generate x characters long token
	$length = $len > 1 ? $len : 16;
	$token = rcube_utils::random_bytes($length);

	$plugin = $this->plugins->exec_hook('secure_token', ['value' => $token, 'length' => $length]);

	$_SESSION['secure_token'] = $plugin['value'];
	}

	if (!empty($_SESSION['secure_token'])) {
	return $_SESSION['secure_token'];
	}
	}

	return false;
	}

	/**
	* Generate a unique token to be used in a form request
	*
	* @return string The request token
	*/
	public function get_request_token()
	{
	if (empty($_SESSION['request_token'])) {
	$plugin = $this->plugins->exec_hook('request_token', ['value' => rcube_utils::random_bytes(32)]);

	$_SESSION['request_token'] = $plugin['value'];
	}

	return $_SESSION['request_token'];
	}

	/**
	* Check if the current request contains a valid token.
	* Empty requests aren't checked until use_secure_urls is set.
	*
	* @param int $mode Request method
	*
	* @return bool True if request token is valid false if not
	*/
	public function check_request($mode = rcube_utils::INPUT_POST)
	{
	// check secure token in URL if enabled
	if ($token = $this->get_secure_url_token()) {
	foreach (explode('/', preg_replace('/[?#&].*$/', '', $_SERVER['REQUEST_URI'])) as $tok) {
	if ($tok == $token) {
	return true;
	}
	}

	$this->request_status = self::REQUEST_ERROR_URL;

	return false;
	}

	$sess_tok = $this->get_request_token();

	// ajax requests
	if (rcube_utils::request_header('X-Roundcube-Request') === $sess_tok) {
	return true;
	}

	// skip empty requests
	if (($mode == rcube_utils::INPUT_POST && empty($_POST))
	\|\| ($mode == rcube_utils::INPUT_GET && empty($_GET))
	) {
	return true;
	}

	// default method of securing requests
	$token = rcube_utils::get_input_value('_token', $mode);

	if (empty($_COOKIE[ini_get('session.name')]) \|\| $token !== $sess_tok) {
	$this->request_status = self::REQUEST_ERROR_TOKEN;
	return false;
	}

	return true;
	}

	/**
	* Build a valid URL to this instance of Roundcube
	*
	* @param mixed $p Either a string with the action or url parameters as key-value pairs
	*
	* @return string Valid application URL
	*/
	public function url($p)
	{
	// STUB: should be overloaded by the application
	return '';
	}

	/**
	* Function to be executed in script shutdown
	* Registered with register_shutdown_function()
	*/
	public function shutdown()
	{
	foreach ($this->shutdown_functions as $function) {
	call_user_func($function);
	}

	// write session data as soon as possible and before
	// closing database connection, don't do this before
	// registered shutdown functions, they may need the session
	// Note: this will run registered gc handlers (ie. cache gc)
	if (!empty($_SERVER['REMOTE_ADDR']) && is_object($this->session)) {
	$this->session->write_close();
	}

	if (is_object($this->smtp)) {
	$this->smtp->disconnect();
	}

	foreach ($this->caches as $cache) {
	if (is_object($cache)) {
	$cache->close();
	}
	}

	if (is_object($this->storage)) {
	$this->storage->close();
	}

	if ($this->config->get('log_driver') == 'syslog') {
	closelog();
	}
	}

	/**
	* Registers shutdown function to be executed on shutdown.
	* The functions will be executed before destroying any
	* objects like smtp, imap, session, etc.
	*
	* @param callable $function Function callback
	*/
	public function add_shutdown_function($function)
	{
	$this->shutdown_functions[] = $function;
	}

	/**
	* When you're going to sleep the script execution for a longer time
	* it is good to close all external connections (sql, memcache, redis, SMTP, IMAP).
	*
	* No action is required on wake up, all connections will be
	* re-established automatically.
	*/
	public function sleep()
	{
	foreach ($this->caches as $cache) {
	if (is_object($cache)) {
	$cache->close();
	}
	}

	if ($this->storage) {
	$this->storage->close();
	}

	if ($this->db) {
	$this->db->closeConnection();
	}

	if ($this->memcache) {
	$this->memcache->close();
	}

	if ($this->memcached) {
	$this->memcached->quit();
	}

	if ($this->smtp) {
	$this->smtp->disconnect();
	}

	if ($this->redis) {
	$this->redis->close();
	}
	}

	/**
	* Quote a given string.
	* Shortcut function for rcube_utils::rep_specialchars_output()
	*
	* @param string $str A string to quote
	* @param string $mode Replace mode for tags: show\|remove\|strict
	* @param bool $newlines Convert newlines
	*
	* @return string HTML-quoted string
	*/
	public static function Q($str, $mode = 'strict', $newlines = true)
	{
	return rcube_utils::rep_specialchars_output($str, 'html', $mode, $newlines);
	}

	/**
	* Quote a given string for javascript output.
	* Shortcut function for rcube_utils::rep_specialchars_output()
	*
	* @param string $str A string to quote
	*
	* @return string JS-quoted string
	*/
	public static function JQ($str)
	{
	return rcube_utils::rep_specialchars_output($str, 'js');
	}

	/**
	* Quote a given string, remove new-line characters, use strict mode.
	* Shortcut function for rcube_utils::rep_specialchars_output()
	*
	* @param string $str A string to quote
	*
	* @return string HTML-quoted string
	*/
	public static function SQ($str)
	{
	return rcube_utils::rep_specialchars_output($str, 'html', 'strict', false);
	}

	/**
	* Construct shell command, execute it and return output as string.
	* Keywords {keyword} are replaced with arguments
	*
	* @param string $cmd Format string with {keywords} to be replaced
	* @param mixed ...$args (zero, one or more arrays can be passed)
	*
	* @return string Output of command. Shell errors not detectable
	*/
	public static function exec($cmd, ...$args)
	{
	$values = $replacements = [];

	// merge values into one array
	foreach ($args as $arg) {
	$values += (array) $arg;
	}

	preg_match_all('/({(-?)([a-z]\w*)})/', $cmd, $matches, PREG_SET_ORDER);
	foreach ($matches as $tags) {
	list(, $tag, $option, $key) = $tags;
	$parts = [];

	if ($option) {
	foreach ((array) $values["-$key"] as $key => $value) {
	if ($value === true \|\| $value === false \|\| $value === null) {
	$parts[] = $value ? $key : "";
	}
	else {
	foreach ((array)$value as $val) {
	$parts[] = "$key " . escapeshellarg($val);
	}
	}
	}
	}
	else {
	foreach ((array) $values[$key] as $value) {
	$parts[] = escapeshellarg($value);
	}
	}

	$replacements[$tag] = implode(' ', $parts);
	}

	// use strtr behaviour of going through source string once
	$cmd = strtr($cmd, $replacements);

	return (string) shell_exec($cmd);
	}

	/**
	* Print or write debug messages
	*
	* @param mixed ...$args Debug message or data
	*/
	public static function console(...$args)
	{
	if (class_exists('rcube', false)) {
	$rcube = self::get_instance();
	$plugin = $rcube->plugins->exec_hook('console', ['args' => $args]);
	if ($plugin['abort']) {
	return;
	}

	$args = $plugin['args'];
	}

	$msg = [];
	foreach ($args as $arg) {
	$msg[] = !is_string($arg) ? var_export($arg, true) : $arg;
	}

	self::write_log('console', implode(";\n", $msg));
	}

	public static function component_name()
	{
	if (defined("KOLAB_SYNC_START")) {
	return "syncroton";
	}
	if (defined("KOLAB_DAV_VERSION")) {
	return "irony";
	}
	if (defined("FILE_API_START")) {
	return "chwala";
	}
	return "roundcube";
	}

	/**
	* Append a line to a logfile in the logs directory.
	* Date will be added automatically to the line.
	*
	* @param string $name Name of the log file
	* @param mixed $line Line to append
	*
	* @return bool True on success, False on failure
	*/
	public static function write_log($name, $line)
	{
	if (!is_string($line)) {
	$line = var_export($line, true);
	}

	$date_format = $log_driver = $session_key = null;
	if (self::$instance) {
	$date_format = self::$instance->config->get('log_date_format');
	$log_driver = self::$instance->config->get('log_driver');
	$session_key = intval(self::$instance->config->get('log_session_id', 8));
	}

	$date = rcube_utils::date_format($date_format);

	// trigger logging hook
	if (is_object(self::$instance) && is_object(self::$instance->plugins)) {
	$log = self::$instance->plugins->exec_hook('write_log',
	['name' => $name, 'date' => $date, 'line' => $line]
	);

	$name = $log['name'];
	$line = $log['line'];
	$date = $log['date'];

	if (!empty($log['abort'])) {
	return true;
	}
	}

	// write message in logfmt format with extra info when configured to log to STDOUT
	if ($log_driver == 'logfmt') {
	$user_name = self::$instance->get_user_name();
	$component = self::component_name();

	$output = "name=$name component=$component";
	// add session ID to the log
	if ($session_key > 0 && ($sess = session_id())) {
	$output .= " session=" . substr($sess, 0, $session_key);
	}

	if (!empty($user_name)) {
	$output .= " user=$user_name";
	}
	// By json_encoding we preserve the original newlines of the message, while still only generating a single line on stdout.
	$line = json_encode($line);
	$output .= " log=$line\n";
	return file_put_contents("php://stdout", $output, FILE_APPEND) !== false;
	}

	// add session ID to the log
	if ($session_key > 0 && ($sess = session_id())) {
	$line = '<' . substr($sess, 0, $session_key) . '> ' . $line;
	}

	// per-user logging is activated
	if (self::$instance && self::$instance->config->get('per_user_logging')
	&& self::$instance->get_user_id()
	&& !in_array($name, ['userlogins', 'sendmail'])
	) {
	$log_dir = self::$instance->get_user_log_dir();
	if (empty($log_dir) && $name !== 'errors') {
	return false;
	}
	}

	if ($log_driver == 'syslog') {
	$prio = $name == 'errors' ? LOG_ERR : LOG_INFO;
	return syslog($prio, $line);
	}

	// write message with file name when configured to log to STDOUT
	if ($log_driver == 'stdout') {
	$stdout = "php://stdout";
	$line = "$name: $line\n";
	return file_put_contents($stdout, $line, FILE_APPEND) !== false;
	}

	// log_driver == 'file' is assumed here

	$line = sprintf("[%s]: %s\n", $date, $line);

	if (empty($log_dir)) {
	if (!empty($log['dir'])) {
	$log_dir = $log['dir'];
	}
	else if (self::$instance) {
	$log_dir = self::$instance->config->get('log_dir');
	}
	}

	if (empty($log_dir)) {
	$log_dir = RCUBE_INSTALL_PATH . 'logs';
	}

	if (self::$instance) {
	$name .= self::$instance->config->get('log_file_ext', '.log');
	}
	else {
	$name .= '.log';
	}

	return file_put_contents("$log_dir/$name", $line, FILE_APPEND) !== false;
	}

	/**
	* Throw system error, with optional logging and script termination.
	*
	* @param array\|Throwable\|string\|PEAR_Error $arg Error object, string or named parameters array:
	* - code: Error code (required)
	* - type: Error type: php, db, imap, etc.
	* - message: Error message
	* - file: File where error occurred
	* - line: Line where error occurred
	* @param bool $log True to log the error
	* @param bool $terminate Terminate script execution
	*/
	public static function raise_error($arg, $log = false, $terminate = false)
	{
	// handle PHP exceptions and errors
	if ($arg instanceof Throwable) {
	$arg = [
	'code' => $arg->getCode(),
	'line' => $arg->getLine(),
	'file' => $arg->getFile(),
	'message' => $arg->getMessage() . "\n" . $arg->getTraceAsString(),
	];
	}
	else if (is_object($arg) && is_a($arg, 'PEAR_Error')) {
	$info = $arg->getUserInfo();
	$arg = [
	'code' => $arg->getCode(),
	'message' => $arg->getMessage() . ($info ? ': ' . $info : ''),
	];
	}
	else if (is_string($arg)) {
	$arg = ['message' => $arg];
	}

	if (empty($arg['code'])) {
	$arg['code'] = 500;
	}

	$cli = php_sapi_name() == 'cli';

	$arg['cli'] = $cli;
	$arg['log'] = $log;
	$arg['terminate'] = $terminate;

	// send error to external error tracking tool
	if (self::$instance) {
	$arg = self::$instance->plugins->exec_hook('raise_error', $arg);
	}

	// installer
	if (!$cli && class_exists('rcmail_install', false)) {
	$rci = rcmail_install::get_instance();
	$rci->raise_error($arg);
	return;
	}

	if (!isset($arg['message'])) {
	$arg['message'] = '';
	}

	if (($log \|\| $terminate) && !$cli && $arg['message']) {
	$arg['fatal'] = $terminate;
	self::log_bug($arg);
	}

	if ($cli) {
	fwrite(STDERR, 'ERROR: ' . trim($arg['message']) . "\n");
	}
	else if ($terminate && is_object(self::$instance->output)) {
	self::$instance->output->raise_error($arg['code'], $arg['message']);
	}
	else if ($terminate) {
	header("HTTP/1.0 500 Internal Error");
	}

	// terminate script
	if ($terminate) {
	if (defined('ROUNDCUBE_TEST_MODE') && ROUNDCUBE_TEST_MODE) {
	throw new Exception('Error raised');
	}
	exit(1);
	}
	}

	/**
	* Log an error
	*
	* @param array $arg_arr Named parameters
	* @see self::raise_error()
	*/
	public static function log_bug($arg_arr)
	{
	$program = !empty($arg_arr['type']) ? strtoupper($arg_arr['type']) : 'PHP';
	$uri = $_SERVER['REQUEST_URI'] ?? '';

	// write error to local log file
	if ($_SERVER['REQUEST_METHOD'] == 'POST') {
	$post_query = [];
	foreach (['_task', '_action'] as $arg) {
	if (isset($_POST[$arg]) && !isset($_GET[$arg])) {
	$post_query[$arg] = $_POST[$arg];
	}
	}

	if (!empty($post_query)) {
	$uri .= (strpos($uri, '?') != false ? '&' : '?')
	. http_build_query($post_query, '', '&');
	}
	}

	$log_entry = sprintf("%s Error: %s%s (%s %s)",
	$program,
	$arg_arr['message'],
	!empty($arg_arr['file']) ? sprintf(' in %s on line %d', $arg_arr['file'], $arg_arr['line']) : '',
	$_SERVER['REQUEST_METHOD'],
	strip_tags($uri)
	);

	if (!self::write_log('errors', $log_entry)) {
	// send error to PHPs error handler if write_log didn't succeed
	trigger_error($arg_arr['message'], E_USER_WARNING);
	}
	}

	/**
	* Write debug info to the log
	*
	* @param string $engine Engine type - file name (memcache, apc, redis)
	* @param string $data Data string to log
	* @param bool $result Operation result
	*/
	public static function debug($engine, $data, $result = null)
	{
	static $debug_counter = [];
	if (empty($debug_counter[$engine])) {
	$debug_count[$engine] = 0;
	}

	if (!isset($debug_counter[$engine])) {
	$debug_counter[$engine] = 0;
	}

	$line = '[' . (++$debug_counter[$engine]) . '] ' . $data;

	if (($len = strlen($line)) > self::DEBUG_LINE_LENGTH) {
	$diff = $len - self::DEBUG_LINE_LENGTH;
	$line = substr($line, 0, self::DEBUG_LINE_LENGTH) . "... [truncated $diff bytes]";
	}

	if ($result !== null) {
	$line .= ' [' . ($result ? 'TRUE' : 'FALSE') . ']';
	}

	self::write_log($engine, $line);
	}

	/**
	* Returns current time (with microseconds).
	*
	* @return float Current time in seconds since the Unix
	*/
	public static function timer()
	{
	return microtime(true);
	}

	/**
	* Logs time difference according to provided timer
	*
	* @param float $timer Timer (self::timer() result)
	* @param string $label Log line prefix
	* @param string $dest Log file name
	*
	* @see self::timer()
	*/
	public static function print_timer($timer, $label = 'Timer', $dest = 'console')
	{
	static $print_count = 0;

	$print_count++;
	$now = self::timer();
	$diff = $now - $timer;

	if (empty($label)) {
	$label = 'Timer '.$print_count;
	}

	self::write_log($dest, sprintf("%s: %0.4f sec", $label, $diff));
	}

	/**
	* Setter for system user object
	*
	* @param rcube_user $user Current user instance
	*/
	public function set_user($user)
	{
	if (is_object($user)) {
	$this->user = $user;

	// overwrite config with user preferences
	$this->config->set_user_prefs((array)$this->user->get_prefs());
	}
	}

	/**
	* Getter for logged user ID.
	*
	* @return mixed User identifier
	*/
	public function get_user_id()
	{
	if (is_object($this->user)) {
	return $this->user->ID;
	}
	else if (isset($_SESSION['user_id'])) {
	return $_SESSION['user_id'];
	}
	}

	/**
	* Getter for logged user name.
	*
	* @return string User name
	*/
	public function get_user_name()
	{
	if (is_object($this->user)) {
	return $this->user->get_username();
	}
	else if (isset($_SESSION['username'])) {
	return $_SESSION['username'];
	}
	}

	/**
	* Getter for logged user email (derived from user name not identity).
	*
	* @return string User email address
	*/
	public function get_user_email()
	{
	if (!empty($this->user_email)) {
	return $this->user_email;
	}

	if (is_object($this->user)) {
	return $this->user->get_username('mail');
	}
	}

	/**
	* Getter for logged user password.
	*
	* @return string User password
	*/
	public function get_user_password()
	{
	if (!empty($this->password)) {
	return $this->password;
	}

	if (isset($_SESSION['password'])) {
	return $this->decrypt($_SESSION['password']);
	}
	}

	/**
	* Get the per-user log directory
	*
	* @return string\|false Per-user log directory if it exists and is writable, False otherwise
	*/
	protected function get_user_log_dir()
	{
	$log_dir = $this->config->get('log_dir', RCUBE_INSTALL_PATH . 'logs');
	$user_name = $this->get_user_name();
	$user_log_dir = $log_dir . '/' . $user_name;

	return !empty($user_name) && is_writable($user_log_dir) ? $user_log_dir : false;
	}

	/**
	* Getter for logged user language code.
	*
	* @return string User language code
	*/
	public function get_user_language()
	{
	if (is_object($this->user)) {
	return $this->user->language;
	}
	else if (isset($_SESSION['language'])) {
	return $_SESSION['language'];
	}
	}

	/**
	* Unique Message-ID generator.
	*
	* @param string $sender Optional sender e-mail address
	*
	* @return string Message-ID
	*/
	public function gen_message_id($sender = null)
	{
	$local_part = md5(uniqid('rcube'.mt_rand(), true));
	$domain_part = '';

	if ($sender && preg_match('/@([^\s]+\.[a-z0-9-]+)/', $sender, $m)) {
	$domain_part = $m[1];
	}
	else {
	$domain_part = $this->user->get_username('domain');
	}

	// Try to find FQDN, some spamfilters doesn't like 'localhost' (#1486924)
	if (!preg_match('/\.[a-z0-9-]+$/i', $domain_part)) {
	foreach ([$_SERVER['HTTP_HOST'], $_SERVER['SERVER_NAME']] as $host) {
	$host = preg_replace('/:[0-9]+$/', '', $host);
	if ($host && preg_match('/\.[a-z]+$/i', $host)) {
	$domain_part = $host;
	break;
	}
	}
	}

	return sprintf('<%s@%s>', $local_part, $domain_part);
	}

	/**
	* Send the given message using the configured method.
	*
	* @param Mail_Mime &$message Reference to Mail_MIME object
	* @param string $from Sender address string
	* @param array\|string $mailto Either a comma-separated list of recipients (RFC822 compliant),
	* or an array of recipients, each RFC822 valid
	* @param array\|string &$error SMTP error array or (deprecated) string
	* @param string &$body_file Location of file with saved message body,
	* used when delay_file_io is enabled
	* @param array $options SMTP options (e.g. DSN request)
	* @param bool $disconnect Close SMTP connection ASAP
	*
	* @return bool Send status.
	*/
	public function deliver_message(&$message, $from, $mailto, &$error,
	&$body_file = null, $options = null, $disconnect = false)
	{
	$plugin = $this->plugins->exec_hook('message_before_send', [
	'message' => $message,
	'from' => $from,
	'mailto' => $mailto,
	'options' => $options,
	]);

	if ($plugin['abort']) {
	if (!empty($plugin['error'])) {
	$error = $plugin['error'];
	}
	if (!empty($plugin['body_file'])) {
	$body_file = $plugin['body_file'];
	}

	return $plugin['result'] ?? false;
	}

	$from = $plugin['from'];
	$mailto = $plugin['mailto'];
	$options = $plugin['options'];
	$message = $plugin['message'];
	$headers = $message->headers();

	// generate list of recipients
	$a_recipients = (array) $mailto;

	if (!empty($headers['Cc'])) {
	$a_recipients[] = $headers['Cc'];
	}
	if (!empty($headers['Bcc'])) {
	$a_recipients[] = $headers['Bcc'];
	}

	// remove Bcc header and get the whole head of the message as string
	$smtp_headers = $message->txtHeaders(['Bcc' => null], true);

	if ($message->getParam('delay_file_io')) {
	// use common temp dir
	$body_file = rcube_utils::temp_filename('msg');
	$mime_result = $message->saveMessageBody($body_file);

	if (is_a($mime_result, 'PEAR_Error')) {
	self::raise_error([
	'code' => 650, 'file' => __FILE__, 'line' => __LINE__,
	'message' => "Could not create message: ".$mime_result->getMessage()
	],
	true, false
	);
	return false;
	}

	$msg_body = fopen($body_file, 'r');
	}
	else {
	$msg_body = $message->get();
	}

	// initialize SMTP connection
	if (!is_object($this->smtp)) {
	$this->smtp_init(true);
	}

	// send message
	$sent = $this->smtp->send_mail($from, $a_recipients, $smtp_headers, $msg_body, $options);
	$response = $this->smtp->get_response();
	$error = $this->smtp->get_error();

	if (!$sent) {
	self::raise_error([
	'code' => 800, 'type' => 'smtp',
	'line' => __LINE__, 'file' => __FILE__,
	'message' => implode("\n", $response)
	], true, false);

	// allow plugins to catch sending errors with the same parameters as in 'message_before_send'
	$plugin = $this->plugins->exec_hook('message_send_error', $plugin + ['error' => $error]);
	$error = $plugin['error'];
	}
	else {
	$this->plugins->exec_hook('message_sent', ['headers' => $headers, 'body' => $msg_body, 'message' => $message]);

	// remove MDN/DSN headers after sending
	unset($headers['Return-Receipt-To'], $headers['Disposition-Notification-To']);

	if ($this->config->get('smtp_log')) {
	// get all recipient addresses
	$mailto = implode(',', $a_recipients);
	$mailto = rcube_mime::decode_address_list($mailto, null, false, null, true);

	self::write_log('sendmail', sprintf("User %s [%s]; Message %s for %s; %s",
	$this->user->get_username(),
	rcube_utils::remote_addr(),
	$headers['Message-ID'],
	implode(', ', $mailto),
	!empty($response) ? implode('; ', $response) : '')
	);
	}
	}

	if (is_resource($msg_body)) {
	fclose($msg_body);
	}

	if ($disconnect) {
	$this->smtp->disconnect();
	}

	// Add Bcc header back
	if (!empty($headers['Bcc'])) {
	$message->headers(['Bcc' => $headers['Bcc']], true);
	}

	return $sent;
	}
	}


	/**
	* Lightweight plugin API class serving as a dummy if plugins are not enabled
	*
	* @package Framework
	* @subpackage Core
	*/
	class rcube_dummy_plugin_api
	{
	/**
	* Triggers a plugin hook.
	*
	* @param string $hook Hook name
	* @param array $args Hook arguments
	*
	* @return array Hook arguments
	* @see rcube_plugin_api::exec_hook()
	*/
	public function exec_hook($hook, $args = [])
	{
	if (!is_array($args)) {
	$args = ['arg' => $args];
	}

	return $args += ['abort' => false];
	}
	}

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