<?php

/**
 * elFinder - file manager for web.
 * Core class.
 *
 * @package elfinder
 * @author  Dmitry (dio) Levashov
 * @author  Troex Nevelin
 * @author  Alexey Sukhotin
 **/
class elFinder
{

    /**
     * API version number
     *
     * @var float
     **/
    protected static $ApiVersion = 2.1;

    /**
     * API version number
     *
     * @deprecated
     * @var string
     **/
    protected $version;

    /**
     * API revision that this connector supports all functions
     *
     * @var integer
     */
    protected static $ApiRevision = 66;

    /**
     * Storages (root dirs)
     *
     * @var array
     **/
    protected $volumes = array();

    /**
     * elFinder instance
     *
     * @var object
     */
    public static $instance = null;

    /**
     * Current request args
     *
     * @var array
     */
    public static $currentArgs = array();

    /**
     * Network mount drivers
     *
     * @var array
     */
    public static $netDrivers = array();

    /**
     * elFinder global locale
     *
     * @var string
     */
    public static $locale = '';

    /**
     * elFinderVolumeDriver default mime.type file path
     *
     * @var string
     */
    public static $defaultMimefile = '';

    /**
     * A file save destination path when a temporary content URL is required
     * on a network volume or the like
     * It can be overwritten by volume route setting
     *
     * @var string
     */
    public static $tmpLinkPath = '';

    /**
     * A file save destination URL when a temporary content URL is required
     * on a network volume or the like
     * It can be overwritten by volume route setting
     *
     * @var string
     */
    public static $tmpLinkUrl = '';

    /**
     * Temporary content URL lifetime (seconds)
     *
     * @var integer
     */
    public static $tmpLinkLifeTime = 3600;

    /**
     * MIME type list handled as a text file
     *
     * @var array
     */
    public static $textMimes = array(
        'application/dash+xml',
        'application/docbook+xml',
        'application/javascript',
        'application/json',
        'application/plt',
        'application/sat',
        'application/sql',
        'application/step',
        'application/vnd.hp-hpgl',
        'application/x-awk',
        'application/x-config',
        'application/x-csh',
        'application/x-empty',
        'application/x-mpegurl',
        'application/x-perl',
        'application/x-php',
        'application/x-web-config',
        'application/xhtml+xml',
        'application/xml',
        'audio/x-mp3-playlist',
        'image/cgm',
        'image/svg+xml',
        'image/vnd.dxf',
        'model/iges'
    );

    /**
     * Maximum memory size to be extended during GD processing
     * (0: not expanded, -1: unlimited or memory size notation)
     *
     * @var integer|string
     */
    public static $memoryLimitGD = 0;

    /**
     * Path of current request flag file for abort check
     *
     * @var string
     */
    protected static $abortCheckFile = null;

    /**
     * elFinder session wrapper object
     *
     * @var elFinderSessionInterface
     */
    protected $session;

    /**
     * elFinder global sessionCacheKey
     *
     * @deprecated
     * @var string
     */
    public static $sessionCacheKey = '';

    /**
     * Is session closed
     *
     * @deprecated
     * @var bool
     */
    private static $sessionClosed = false;

    /**
     * elFinder base64encodeSessionData
     * elFinder save session data as `UTF-8`
     * If the session storage mechanism of the system does not allow `UTF-8`
     * And it must be `true` option 'base64encodeSessionData' of elFinder
     * WARNING: When enabling this option, if saving the data passed from the user directly to the session variable,
     * it make vulnerable to the object injection attack, so use it carefully.
     * see https://github.com/Studio-42/elFinder/issues/2345
     *
     * @var bool
     */
    protected static $base64encodeSessionData = false;

    /**
     * elFinder common tempraly path
     *
     * @var string
     * @default "./.tmp" or sys_get_temp_dir()
     **/
    protected static $commonTempPath = '';

    /**
     * Callable function for URL upload filter
     * The first argument is a URL and the second argument is an instance of the elFinder class
     * A filter should be return true (to allow) / false (to disallow)
     *
     * @var callable
     * @default null
     */
    protected $urlUploadFilter = null;

    /**
     * Connection flag files path that connection check of current request
     *
     * @var string
     * @default value of $commonTempPath
     */
    protected static $connectionFlagsPath = '';

    /**
     * Additional volume root options for network mounting volume
     *
     * @var array
     */
    protected $optionsNetVolumes = array();

    /**
     * Session key of net mount volumes
     *
     * @deprecated
     * @var string
     */
    protected $netVolumesSessionKey = '';

    /**
     * Mounted volumes count
     * Required to create unique volume id
     *
     * @var int
     **/
    public static $volumesCnt = 1;

    /**
     * Default root (storage)
     *
     * @var elFinderVolumeDriver
     **/
    protected $default = null;

    /**
     * Commands and required arguments list
     *
     * @var array
     **/
    protected $commands = array(
        'abort' => array('id' => true),
        'archive' => array('targets' => true, 'type' => true, 'mimes' => false, 'name' => false),
        'callback' => array('node' => true, 'json' => false, 'bind' => false, 'done' => false),
        'chmod' => array('targets' => true, 'mode' => true),
        'dim' => array('target' => true, 'substitute' => false),
        'duplicate' => array('targets' => true, 'suffix' => false),
        'editor' => array('name' => true, 'method' => true, 'args' => false),
        'extract' => array('target' => true, 'mimes' => false, 'makedir' => false),
        'file' => array('target' => true, 'download' => false, 'cpath' => false, 'onetime' => false),
        'get' => array('target' => true, 'conv' => false),
        'info' => array('targets' => true, 'compare' => false),
        'ls' => array('target' => true, 'mimes' => false, 'intersect' => false),
        'mkdir' => array('target' => true, 'name' => false, 'dirs' => false),
        'mkfile' => array('target' => true, 'name' => true, 'mimes' => false),
        'netmount' => array('protocol' => true, 'host' => true, 'path' => false, 'port' => false, 'user' => false, 'pass' => false, 'alias' => false, 'options' => false),
        'open' => array('target' => false, 'tree' => false, 'init' => false, 'mimes' => false, 'compare' => false),
        'parents' => array('target' => true, 'until' => false),
        'paste' => array('dst' => true, 'targets' => true, 'cut' => false, 'mimes' => false, 'renames' => false, 'hashes' => false, 'suffix' => false),
        'put' => array('target' => true, 'content' => '', 'mimes' => false, 'encoding' => false),
        'rename' => array('target' => true, 'name' => true, 'mimes' => false, 'targets' => false, 'q' => false),
        'resize' => array('target' => true, 'width' => false, 'height' => false, 'mode' => false, 'x' => false, 'y' => false, 'degree' => false, 'quality' => false, 'bg' => false),
        'rm' => array('targets' => true),
        'search' => array('q' => true, 'mimes' => false, 'target' => false, 'type' => false),
        'size' => array('targets' => true),
        'subdirs' => array('targets' => true),
        'tmb' => array('targets' => true),
        'tree' => array('target' => true),
        'upload' => array('target' => true, 'FILES' => true, 'mimes' => false, 'html' => false, 'upload' => false, 'name' => false, 'upload_path' => false, 'chunk' => false, 'cid' => false, 'node' => false, 'renames' => false, 'hashes' => false, 'suffix' => false, 'mtime' => false, 'overwrite' => false, 'contentSaveId' => false),
        'url' => array('target' => true, 'options' => false),
        'zipdl' => array('targets' => true, 'download' => false)
    );

    /**
     * Plugins instance
     *
     * @var array
     **/
    protected $plugins = array();

    /**
     * Commands listeners
     *
     * @var array
     **/
    protected $listeners = array();

    /**
     * script work time for debug
     *
     * @var string
     **/
    protected $time = 0;
    /**
     * Is elFinder init correctly?
     *
     * @var bool
     **/
    protected $loaded = false;
    /**
     * Send debug to client?
     *
     * @var string
     **/
    protected $debug = false;

    /**
     * Call `session_write_close()` before exec command?
     *
     * @var bool
     */
    protected $sessionCloseEarlier = true;

    /**
     * SESSION use commands @see __construct()
     *
     * @var array
     */
    protected $sessionUseCmds = array();

    /**
     * session expires timeout
     *
     * @var int
     **/
    protected $timeout = 0;

    /**
     * Temp dir path for Upload
     *
     * @var string
     */
    protected $uploadTempPath = '';

    /**
     * Max allowed archive files size (0 - no limit)
     *
     * @var integer
     */
    protected $maxArcFilesSize = 0;

    /**
     * undocumented class variable
     *
     * @var string
     **/
    protected $uploadDebug = '';

    /**
     * Max allowed numbar of targets (0 - no limit)
     *
     * @var integer
     */
    public $maxTargets = 1000;

    /**
     * Errors from PHP
     *
     * @var array
     **/
    public static $phpErrors = array();

    /**
     * Errors from not mounted volumes
     *
     * @var array
     **/
    public $mountErrors = array();


    /**
     * Archivers cache
     *
     * @var array
     */
    public static $archivers = array();

    /**
     * URL for callback output window for CORS
     * redirect to this URL when callback output
     *
     * @var string URL
     */
    protected $callbackWindowURL = '';

    /**
     * hash of items to unlock on command completion
     *
     * @var array hashes
     */
    protected $autoUnlocks = array();

    /**
     * Item locking expiration (seconds)
     * Default: 3600 secs
     *
     * @var integer
     */
    protected $itemLockExpire = 3600;

    /**
     * Additional request querys
     *
     * @var array|null
     */
    protected $customData = null;

    /**
     * Ids to remove of session var "urlContentSaveIds" for contents uploading by URL
     *
     * @var array
     */
    protected $removeContentSaveIds = array();

    /**
     * LAN class allowed when uploading via URL
     * 
     * Array keys are 'local', 'private_a', 'private_b', 'private_c' and 'link'
     * 
     * local:     127.0.0.0/8
     * private_a: 10.0.0.0/8
     * private_b: 172.16.0.0/12
     * private_c: 192.168.0.0/16
     * link:      169.254.0.0/16
     *
     * @var        array
     */
    protected $uploadAllowedLanIpClasses = array();

    /**
     * Flag of throw Error on exec()
     *
     * @var boolean
     */
    protected $throwErrorOnExec = false;

    /**
     * Default params of toastParams
     *
     * @var        array
     */
    protected $toastParamsDefault = array(
        'mode'   => 'warning',
        'prefix' => ''
    );

    /**
     * Toast params of runtime notification
     *
     * @var        array
     */
    private $toastParams = array();

    /**
     * Toast messages of runtime notification
     *
     * @var        array
     */
    private $toastMessages = array();

    /**
     * Optional UTF-8 encoder
     *
     * @var        callable || null
     */
    private $utf8Encoder = null;

    /**
     * Seekable URL file pointer ids -  for getStreamByUrl()
     *
     * @var        array
     */
    private static $seekableUrlFps = array();

    // Errors messages
    const ERROR_ACCESS_DENIED = 'errAccess';
    const ERROR_ARC_MAXSIZE = 'errArcMaxSize';
    const ERROR_ARC_SYMLINKS = 'errArcSymlinks';
    const ERROR_ARCHIVE = 'errArchive';
    const ERROR_ARCHIVE_EXEC = 'errArchiveExec';
    const ERROR_ARCHIVE_TYPE = 'errArcType';
    const ERROR_CONF = 'errConf';
    const ERROR_CONF_NO_JSON = 'errJSON';
    const ERROR_CONF_NO_VOL = 'errNoVolumes';
    const ERROR_CONV_UTF8 = 'errConvUTF8';
    const ERROR_COPY = 'errCopy';
    const ERROR_COPY_FROM = 'errCopyFrom';
    const ERROR_COPY_ITSELF = 'errCopyInItself';
    const ERROR_COPY_TO = 'errCopyTo';
    const ERROR_CREATING_TEMP_DIR = 'errCreatingTempDir';
    const ERROR_DIR_NOT_FOUND = 'errFolderNotFound';
    const ERROR_EXISTS = 'errExists';        // 'File named "$1" already exists.'
    const ERROR_EXTRACT = 'errExtract';
    const ERROR_EXTRACT_EXEC = 'errExtractExec';
    const ERROR_FILE_NOT_FOUND = 'errFileNotFound';     // 'File not found.'
    const ERROR_FTP_DOWNLOAD_FILE = 'errFtpDownloadFile';
    const ERROR_FTP_MKDIR = 'errFtpMkdir';
    const ERROR_FTP_UPLOAD_FILE = 'errFtpUploadFile';
    const ERROR_INV_PARAMS = 'errCmdParams';
    const ERROR_INVALID_DIRNAME = 'errInvDirname';    // 'Invalid folder name.'
    const ERROR_INVALID_NAME = 'errInvName';       // 'Invalid file name.'
    const ERROR_LOCKED = 'errLocked';        // '"$1" is locked and can not be renamed, moved or removed.'
    const ERROR_MAX_TARGTES = 'errMaxTargets'; // 'Max number of selectable items is $1.'
    const ERROR_MKDIR = 'errMkdir';
    const ERROR_MKFILE = 'errMkfile';
    const ERROR_MKOUTLINK = 'errMkOutLink';        // 'Unable to create a link to outside the volume root.'
    const ERROR_MOVE = 'errMove';
    const ERROR_NETMOUNT = 'errNetMount';
    const ERROR_NETMOUNT_FAILED = 'errNetMountFailed';
    const ERROR_NETMOUNT_NO_DRIVER = 'errNetMountNoDriver';
    const ERROR_NETUNMOUNT = 'errNetUnMount';
    const ERROR_NOT_ARCHIVE = 'errNoArchive';
    const ERROR_NOT_DIR = 'errNotFolder';
    const ERROR_NOT_FILE = 'errNotFile';
    const ERROR_NOT_REPLACE = 'errNotReplace';       // Object "$1" already exists at this location and can not be replaced with object of another type.
    const ERROR_NOT_UTF8_CONTENT = 'errNotUTF8Content';
    const ERROR_OPEN = 'errOpen';
    const ERROR_PERM_DENIED = 'errPerm';
    const ERROR_REAUTH_REQUIRE = 'errReauthRequire';  // 'Re-authorization is required.'
    const ERROR_RENAME = 'errRename';
    const ERROR_REPLACE = 'errReplace';          // 'Unable to replace "$1".'
    const ERROR_RESIZE = 'errResize';
    const ERROR_RESIZESIZE = 'errResizeSize';
    const ERROR_RM = 'errRm';               // 'Unable to remove "$1".'
    const ERROR_RM_SRC = 'errRmSrc';            // 'Unable remove source file(s)'
    const ERROR_SAVE = 'errSave';
    const ERROR_SEARCH_TIMEOUT = 'errSearchTimeout';    // 'Timed out while searching "$1". Search result is partial.'
    const ERROR_SESSION_EXPIRES = 'errSessionExpires';
    const ERROR_TRGDIR_NOT_FOUND = 'errTrgFolderNotFound'; // 'Target folder "$1" not found.'
    const ERROR_UNKNOWN = 'errUnknown';
    const ERROR_UNKNOWN_CMD = 'errUnknownCmd';
    const ERROR_UNSUPPORT_TYPE = 'errUsupportType';
    const ERROR_UPLOAD = 'errUpload';           // 'Upload error.'
    const ERROR_UPLOAD_FILE = 'errUploadFile';       // 'Unable to upload "$1".'
    const ERROR_UPLOAD_FILE_MIME = 'errUploadMime';       // 'File type not allowed.'
    const ERROR_UPLOAD_FILE_SIZE = 'errUploadFileSize';   // 'File exceeds maximum allowed size.'
    const ERROR_UPLOAD_NO_FILES = 'errUploadNoFiles';    // 'No files found for upload.'
    const ERROR_UPLOAD_TEMP = 'errUploadTemp';       // 'Unable to make temporary file for upload.'
    const ERROR_UPLOAD_TOTAL_SIZE = 'errUploadTotalSize';  // 'Data exceeds the maximum allowed size.'
    const ERROR_UPLOAD_TRANSFER = 'errUploadTransfer';   // '"$1" transfer error.'
    const ERROR_MAX_MKDIRS = 'errMaxMkdirs'; // 'You can create up to $1 folders at one time.'

    /**
     * Constructor
     *
     * @param  array  elFinder and roots configurations
     *
     * @author Dmitry (dio) Levashov
     */
    public function __construct($opts)
    {
        // set default_charset
        if (version_compare(PHP_VERSION, '5.6', '>=')) {
            if (($_val = ini_get('iconv.internal_encoding')) && strtoupper($_val) !== 'UTF-8') {
                ini_set('iconv.internal_encoding', '');
            }
            if (($_val = ini_get('mbstring.internal_encoding')) && strtoupper($_val) !== 'UTF-8') {
                ini_set('mbstring.internal_encoding', '');
            }
            if (($_val = ini_get('internal_encoding')) && strtoupper($_val) !== 'UTF-8') {
                ini_set('internal_encoding', '');
            }
        } else {
            if (function_exists('iconv_set_encoding') && strtoupper(iconv_get_encoding('internal_encoding')) !== 'UTF-8') {
                iconv_set_encoding('internal_encoding', 'UTF-8');
            }
            if (function_exists('mb_internal_encoding') && strtoupper(mb_internal_encoding()) !== 'UTF-8') {
                mb_internal_encoding('UTF-8');
            }
        }
        ini_set('default_charset', 'UTF-8');

        // define accept constant of server commands path
        !defined('ELFINDER_TAR_PATH') && define('ELFINDER_TAR_PATH', 'tar');
        !defined('ELFINDER_GZIP_PATH') && define('ELFINDER_GZIP_PATH', 'gzip');
        !defined('ELFINDER_BZIP2_PATH') && define('ELFINDER_BZIP2_PATH', 'bzip2');
        !defined('ELFINDER_XZ_PATH') && define('ELFINDER_XZ_PATH', 'xz');
        !defined('ELFINDER_ZIP_PATH') && define('ELFINDER_ZIP_PATH', 'zip');
        !defined('ELFINDER_UNZIP_PATH') && define('ELFINDER_UNZIP_PATH', 'unzip');
        !defined('ELFINDER_RAR_PATH') && define('ELFINDER_RAR_PATH', 'rar');
        // Create archive in RAR4 format even when using RAR5 library (true or false)
        !defined('ELFINDER_RAR_MA4') && define('ELFINDER_RAR_MA4', false);
        !defined('ELFINDER_UNRAR_PATH') && define('ELFINDER_UNRAR_PATH', 'unrar');
        !defined('ELFINDER_7Z_PATH') && define('ELFINDER_7Z_PATH', (substr(PHP_OS, 0, 3) === 'WIN') ? '7z' : '7za');
        !defined('ELFINDER_CONVERT_PATH') && define('ELFINDER_CONVERT_PATH', 'convert');
        !defined('ELFINDER_IDENTIFY_PATH') && define('ELFINDER_IDENTIFY_PATH', 'identify');
        !defined('ELFINDER_EXIFTRAN_PATH') && define('ELFINDER_EXIFTRAN_PATH', 'exiftran');
        !defined('ELFINDER_JPEGTRAN_PATH') && define('ELFINDER_JPEGTRAN_PATH', 'jpegtran');
        !defined('ELFINDER_FFMPEG_PATH') && define('ELFINDER_FFMPEG_PATH', 'ffmpeg');

        !defined('ELFINDER_DISABLE_ZIPEDITOR') && define('ELFINDER_DISABLE_ZIPEDITOR', false);

        // enable(true)/disable(false) handling postscript on ImageMagick
        // Should be `false` as long as there is a Ghostscript vulnerability
        // see https://artifex.com/news/ghostscript-security-resolved/
        !defined('ELFINDER_IMAGEMAGICK_PS') && define('ELFINDER_IMAGEMAGICK_PS', false);

        // for backward compat
        $this->version = (string)self::$ApiVersion;

        // set error handler of WARNING, NOTICE
        $errLevel = E_WARNING | E_NOTICE | E_USER_WARNING | E_USER_NOTICE | E_RECOVERABLE_ERROR;
        if (defined('E_DEPRECATED')) {
            $errLevel |= E_DEPRECATED | E_USER_DEPRECATED;
        }
        // E_STRICT is deprecated; see https://wiki.php.net/rfc/deprecations_php_8_4#remove_e_strict_error_level_and_deprecate_e_strict_constant
        if (defined('E_STRICT')) {
            $errLevel |= @E_STRICT;
        }
        set_error_handler('elFinder::phpErrorHandler', $errLevel);

        // Associative array of file pointers to close at the end of script: ['temp file pointer' => true]
        $GLOBALS['elFinderTempFps'] = array();
        // Associative array of files to delete at the end of script: ['temp file path' => true]
        $GLOBALS['elFinderTempFiles'] = array();
        // Associative array of abort files to delete at the end of script: ['temp file path' => true]
        $GLOBALS['elFinderAbortFiles'] = array();
        // regist Shutdown function
        register_shutdown_function(array('elFinder', 'onShutdown'));

        // convert PATH_INFO to GET query
        if (!empty($_SERVER['PATH_INFO'])) {
            $_ps = explode('/', trim($_SERVER['PATH_INFO'], '/'));
            if (!isset($_GET['cmd'])) {
                $_cmd = $_ps[0];
                if (isset($this->commands[$_cmd])) {
                    $_GET['cmd'] = $_cmd;
                    $_i = 1;
                    foreach (array_keys($this->commands[$_cmd]) as $_k) {
                        if (isset($_ps[$_i])) {
                            if (!isset($_GET[$_k])) {
                                $_GET[$_k] = $_ps[$_i++];
                            }
                        } else {
                            break;
                        }
                    }
                }
            }
        }

        // set elFinder instance
        elFinder::$instance = $this;

        // setup debug mode
        $this->debug = (isset($opts['debug']) && $opts['debug'] ? true : false);
        if ($this->debug) {
            error_reporting(defined('ELFINDER_DEBUG_ERRORLEVEL') ? ELFINDER_DEBUG_ERRORLEVEL : -1);
            ini_set('display_errors', '1');
            // clear output buffer and stop output filters
            while (ob_get_level() && ob_end_clean()) {
            }
        }

        if (!interface_exists('elFinderSessionInterface')) {
            include_once dirname(__FILE__) . '/elFinderSessionInterface.php';
        }

        // session handler
        if (!empty($opts['session']) && $opts['session'] instanceof elFinderSessionInterface) {
            $this->session = $opts['session'];
        } else {
            $sessionOpts = array(
                'base64encode' => !empty($opts['base64encodeSessionData']),
                'keys' => array(
                    'default' => !empty($opts['sessionCacheKey']) ? $opts['sessionCacheKey'] : 'elFinderCaches',
                    'netvolume' => !empty($opts['netVolumesSessionKey']) ? $opts['netVolumesSessionKey'] : 'elFinderNetVolumes'
                )
            );
            if (!class_exists('elFinderSession')) {
                include_once dirname(__FILE__) . '/elFinderSession.php';
            }
            $this->session = new elFinderSession($sessionOpts);
        }
        // try session start | restart
        $this->session->start();

        // 'netmount' added to handle requests synchronously on unmount
        $sessionUseCmds = array('netmount');
        if (isset($opts['sessionUseCmds']) && is_array($opts['sessionUseCmds'])) {
            $sessionUseCmds = array_merge($sessionUseCmds, $opts['sessionUseCmds']);
        }

        // set self::$volumesCnt by HTTP header "X-elFinder-VolumesCntStart"
        if (isset($_SERVER['HTTP_X_ELFINDER_VOLUMESCNTSTART']) && ($volumesCntStart = intval($_SERVER['HTTP_X_ELFINDER_VOLUMESCNTSTART']))) {
            self::$volumesCnt = $volumesCntStart;
        }

        $this->time = $this->utime();
        $this->sessionCloseEarlier = isset($opts['sessionCloseEarlier']) ? (bool)$opts['sessionCloseEarlier'] : true;
        $this->sessionUseCmds = array_flip($sessionUseCmds);
        $this->timeout = (isset($opts['timeout']) ? $opts['timeout'] : 0);
        $this->uploadTempPath = (isset($opts['uploadTempPath']) ? $opts['uploadTempPath'] : '');
        $this->callbackWindowURL = (isset($opts['callbackWindowURL']) ? $opts['callbackWindowURL'] : '');
        $this->maxTargets = (isset($opts['maxTargets']) ? intval($opts['maxTargets']) : $this->maxTargets);
        elFinder::$commonTempPath = (isset($opts['commonTempPath']) ? realpath($opts['commonTempPath']) : dirname(__FILE__) . '/.tmp');
        if (!is_writable(elFinder::$commonTempPath)) {
            elFinder::$commonTempPath = sys_get_temp_dir();
            if (!is_writable(elFinder::$commonTempPath)) {
                elFinder::$commonTempPath = '';
            }
        }
        if (isset($opts['connectionFlagsPath']) && is_writable($opts['connectionFlagsPath'] = realpath($opts['connectionFlagsPath']))) {
            elFinder::$connectionFlagsPath = $opts['connectionFlagsPath'];
        } else {
            elFinder::$connectionFlagsPath = elFinder::$commonTempPath;
        }

        if (!empty($opts['tmpLinkPath'])) {
            elFinder::$tmpLinkPath = realpath($opts['tmpLinkPath']);
        }
        if (!empty($opts['tmpLinkUrl'])) {
            elFinder::$tmpLinkUrl = $opts['tmpLinkUrl'];
        }
        if (!empty($opts['tmpLinkLifeTime'])) {
            elFinder::$tmpLinkLifeTime = $opts['tmpLinkLifeTime'];
        }
        if (!empty($opts['textMimes']) && is_array($opts['textMimes'])) {
            elfinder::$textMimes = $opts['textMimes'];
        }
        if (!empty($opts['urlUploadFilter'])) {
            $this->urlUploadFilter = $opts['urlUploadFilter'];
        }
        $this->maxArcFilesSize = isset($opts['maxArcFilesSize']) ? intval($opts['maxArcFilesSize']) : 0;
        $this->optionsNetVolumes = (isset($opts['optionsNetVolumes']) && is_array($opts['optionsNetVolumes'])) ? $opts['optionsNetVolumes'] : array();
        if (isset($opts['itemLockExpire'])) {
            $this->itemLockExpire = intval($opts['itemLockExpire']);
        }

        if (!empty($opts['uploadAllowedLanIpClasses'])) {
            $this->uploadAllowedLanIpClasses = array_flip($opts['uploadAllowedLanIpClasses']);
        }

        // deprecated settings
        $this->netVolumesSessionKey = !empty($opts['netVolumesSessionKey']) ? $opts['netVolumesSessionKey'] : 'elFinderNetVolumes';
        self::$sessionCacheKey = !empty($opts['sessionCacheKey']) ? $opts['sessionCacheKey'] : 'elFinderCaches';

        // check session cache
        $_optsMD5 = md5(json_encode($opts['roots']));
        if ($this->session->get('_optsMD5') !== $_optsMD5) {
            $this->session->set('_optsMD5', $_optsMD5);
        }

        // setlocale and global locale regists to elFinder::locale
        self::$locale = !empty($opts['locale']) ? $opts['locale'] : (substr(PHP_OS, 0, 3) === 'WIN' ? 'C' : 'en_US.UTF-8');
        if (false === setlocale(LC_ALL, self::$locale)) {
            self::$locale = setlocale(LC_ALL, '0');
        }

        // set defaultMimefile
        elFinder::$defaultMimefile = isset($opts['defaultMimefile']) ? $opts['defaultMimefile'] : '';

        // set memoryLimitGD
        elFinder::$memoryLimitGD = isset($opts['memoryLimitGD']) ? $opts['memoryLimitGD'] : 0;

        // set flag of throwErrorOnExec
        // `true` need `try{}` block for `$connector->run();`
        $this->throwErrorOnExec = !empty($opts['throwErrorOnExec']);

        // set archivers
        elFinder::$archivers = isset($opts['archivers']) && is_array($opts['archivers']) ? $opts['archivers'] : array();

        // set utf8Encoder
        if (isset($opts['utf8Encoder']) && is_callable($opts['utf8Encoder'])) {
            $this->utf8Encoder = $opts['utf8Encoder'];
        }

        // for LocalFileSystem driver on Windows server
        if (DIRECTORY_SEPARATOR !== '/') {
            if (empty($opts['bind'])) {
                $opts['bind'] = array();
            }

            $_key = 'upload.pre mkdir.pre mkfile.pre rename.pre archive.pre ls.pre';
            if (!isset($opts['bind'][$_key])) {
                $opts['bind'][$_key] = array();
            }
            array_push($opts['bind'][$_key], 'Plugin.WinRemoveTailDots.cmdPreprocess');

            $_key = 'upload.presave paste.copyfrom';
            if (!isset($opts['bind'][$_key])) {
                $opts['bind'][$_key] = array();
            }
            array_push($opts['bind'][$_key], 'Plugin.WinRemoveTailDots.onUpLoadPreSave');
        }

        // bind events listeners
        if (!empty($opts['bind']) && is_array($opts['bind'])) {
            $_req = $_SERVER["REQUEST_METHOD"] == 'POST' ? $_POST : $_GET;
            $_reqCmd = isset($_req['cmd']) ? $_req['cmd'] : '';
            foreach ($opts['bind'] as $cmd => $handlers) {
                $doRegist = (strpos($cmd, '*') !== false);
                if (!$doRegist) {
                    $doRegist = ($_reqCmd && in_array($_reqCmd, array_map('elFinder::getCmdOfBind', explode(' ', $cmd))));
                }
                if ($doRegist) {
                    // for backward compatibility
                    if (!is_array($handlers)) {
                        $handlers = array($handlers);
                    } else {
                        if (count($handlers) === 2 && is_callable($handlers)) {
                            $handlers = array($handlers);
                        }
                    }
                    foreach ($handlers as $handler) {
                        if ($handler) {
                            if (is_string($handler) && strpos($handler, '.')) {
                                list($_domain, $_name, $_method) = array_pad(explode('.', $handler), 3, '');
                                if (strcasecmp($_domain, 'plugin') === 0) {
                                    if ($plugin = $this->getPluginInstance($_name, isset($opts['plugin'][$_name]) ? $opts['plugin'][$_name] : array())
                                        and method_exists($plugin, $_method)) {
                                        $this->bind($cmd, array($plugin, $_method));
                                    }
                                }
                            } else {
                                $this->bind($cmd, $handler);
                            }
                        }
                    }
                }
            }
        }

        if (!isset($opts['roots']) || !is_array($opts['roots'])) {
            $opts['roots'] = array();
        }

        // try to enable elFinderVolumeFlysystemZipArchiveNetmount to zip editing
        if (empty(elFinder::$netDrivers['ziparchive'])) {
            elFinder::$netDrivers['ziparchive'] = 'FlysystemZipArchiveNetmount';
        }

        // check for net volumes stored in session
        $netVolumes = $this->getNetVolumes();
        foreach ($netVolumes as $key => $root) {
            if (!isset($root['id'])) {
                // given fixed unique id
                if (!$root['id'] = $this->getNetVolumeUniqueId($netVolumes)) {
                    $this->mountErrors[] = 'Netmount Driver "' . $root['driver'] . '" : Could\'t given volume id.';
                    continue;
                }
            }
            $root['_isNetVolume'] = true;
            $opts['roots'][$key] = $root;
        }

        // "mount" volumes
        foreach ($opts['roots'] as $i => $o) {
            $class = 'elFinderVolume' . (isset($o['driver']) ? $o['driver'] : '');

            if (class_exists($class)) {
                /* @var elFinderVolumeDriver $volume */
                $volume = new $class();

                try {
                    if ($this->maxArcFilesSize && (empty($o['maxArcFilesSize']) || $this->maxArcFilesSize < $o['maxArcFilesSize'])) {
                        $o['maxArcFilesSize'] = $this->maxArcFilesSize;
                    }
                    // pass session handler
                    $volume->setSession($this->session);
                    if (!$this->default) {
                        $volume->setNeedOnline(true);
                    }
                    if ($volume->mount($o)) {
                        // unique volume id (ends on "_") - used as prefix to files hash
                        $id = $volume->id();

                        $this->volumes[$id] = $volume;
                        if ((!$this->default || $volume->root() !== $volume->defaultPath()) && $volume->isReadable()) {
                            $this->default = $volume;
                        }
                    } else {
                        if (!empty($o['_isNetVolume'])) {
                            $this->removeNetVolume($i, $volume);
                        }
                        $this->mountErrors[] = 'Driver "' . $class . '" : ' . implode(' ', $volume->error());
                    }
                } catch (Exception $e) {
                    if (!empty($o['_isNetVolume'])) {
                        $this->removeNetVolume($i, $volume);
                    }
                    $this->mountErrors[] = 'Driver "' . $class . '" : ' . $e->getMessage();
                }
            } else {
                if (!empty($o['_isNetVolume'])) {
                    $this->removeNetVolume($i, $volume);
                }
                $this->mountErrors[] = 'Driver "' . $class . '" does not exist';
            }
        }

        // if at least one readable volume - ii desu >_<
        $this->loaded = !empty($this->default);

        // restore error handler for now
        restore_error_handler();
    }

    /**
     * Return elFinder session wrapper instance
     *
     * @return  elFinderSessionInterface
     **/
    public function getSession()
    {
        return $this->session;
    }

    /**
     * Return true if fm init correctly
     *
     * @return bool
     * @author Dmitry (dio) Levashov
     **/
    public function loaded()
    {
        return $this->loaded;
    }

    /**
     * Return version (api) number
     *
     * @return string
     * @author Dmitry (dio) Levashov
     **/
    public function version()
    {
        return self::$ApiVersion;
    }

    /**
     * Return revision (api) number
     *
     * @return string
     * @author Naoki Sawada
     **/
    public function revision()
    {
        return self::$ApiRevision;
    }

    /**
     * Add handler to elFinder command
     *
     * @param  string  command name
     * @param  string|array  callback name or array(object, method)
     *
     * @return elFinder
     * @author Dmitry (dio) Levashov
     **/
    public function bind($cmd, $handler)
    {
        $allCmds = array_keys($this->commands);
        $cmds = array();
        foreach (explode(' ', $cmd) as $_cmd) {
            if ($_cmd !== '') {
                if ($all = strpos($_cmd, '*') !== false) {
                    list(, $sub) = array_pad(explode('.', $_cmd), 2, '');
                    if ($sub) {
                        $sub = str_replace('\'', '\\\'', $sub);
                        $subs = array_fill(0, count($allCmds), $sub);
                        $cmds = array_merge($cmds, array_map(array('elFinder', 'addSubToBindName'), $allCmds, $subs));
                    } else {
                        $cmds = array_merge($cmds, $allCmds);
                    }
                } else {
                    $cmds[] = $_cmd;
                }
            }
        }
        $cmds = array_unique($cmds);

        foreach ($cmds as $cmd) {
            if (!isset($this->listeners[$cmd])) {
                $this->listeners[$cmd] = array();
            }

            if (is_callable($handler)) {
                $this->listeners[$cmd][] = $handler;
            }
        }

        return $this;
    }

    /**
     * Remove event (command exec) handler
     *
     * @param  string  command name
     * @param  string|array  callback name or array(object, method)
     *
     * @return elFinder
     * @author Dmitry (dio) Levashov
     **/
    public function unbind($cmd, $handler)
    {
        if (!empty($this->listeners[$cmd])) {
            foreach ($this->listeners[$cmd] as $i => $h) {
                if ($h === $handler) {
                    unset($this->listeners[$cmd][$i]);
                    return $this;
                }
            }
        }
        return $this;
    }

    /**
     * Trigger binded functions
     *
     * @param      string  $cmd     binded command name
     * @param      array   $vars    variables to pass to listeners
     * @param      array   $errors  array into which the error is written
     */
    public function trigger($cmd, $vars, &$errors)
    {
        if (!empty($this->listeners[$cmd])) {
            foreach ($this->listeners[$cmd] as $handler) {
                $_res = call_user_func_array($handler, $vars);
                if ($_res && is_array($_res)) {
                    $_err = !empty($_res['error'])? $_res['error'] : (!empty($_res['warning'])? $_res['warning'] : null);
                    if ($_err) {
                        if (is_array($_err)) {
                            $errors = array_merge($errors, $_err);
                        } else {
                            $errors[] = (string)$_err;
                        }
                        if ($_res['error']) {
                            throw new elFinderTriggerException();
                        }
                    }
                }
            }
        }
    }

    /**
     * Return true if command exists
     *
     * @param  string  command name
     *
     * @return bool
     * @author Dmitry (dio) Levashov
     **/
    public function commandExists($cmd)
    {
        return $this->loaded && isset($this->commands[$cmd]) && method_exists($this, $cmd);
    }

    /**
     * Return root - file's owner (public func of volume())
     *
     * @param  string  file hash
     *
     * @return elFinderVolumeDriver
     * @author Naoki Sawada
     */
    public function getVolume($hash)
    {
        return $this->volume($hash);
    }

    /**
     * Return command required arguments info
     *
     * @param  string  command name
     *
     * @return array
     * @author Dmitry (dio) Levashov
     **/
    public function commandArgsList($cmd)
    {
        if ($this->commandExists($cmd)) {
            $list = $this->commands[$cmd];
            $list['reqid'] = false;
        } else {
            $list = array();
        }
        return $list;
    }

    private function session_expires()
    {

        if (!$last = $this->session->get(':LAST_ACTIVITY')) {
            $this->session->set(':LAST_ACTIVITY', time());
            return false;
        }

        if (($this->timeout > 0) && (time() - $last > $this->timeout)) {
            return true;
        }

        $this->session->set(':LAST_ACTIVITY', time());
        return false;
    }

    /**
     * Exec command and return result
     *
     * @param  string $cmd  command name
     * @param  array  $args command arguments
     *
     * @return array
     * @throws elFinderAbortException|Exception
     * @author Dmitry (dio) Levashov
     **/
    public function exec($cmd, $args)
    {
        // set error handler of WARNING, NOTICE
        set_error_handler('elFinder::phpErrorHandler', E_WARNING | E_NOTICE | E_USER_WARNING | E_USER_NOTICE);

        // set current request args
        self::$currentArgs = $args;

        if (!$this->loaded) {
            return array('error' => $this->error(self::ERROR_CONF, self::ERROR_CONF_NO_VOL));
        }

        if ($this->session_expires()) {
            return array('error' => $this->error(self::ERROR_SESSION_EXPIRES));
        }

        if (!$this->commandExists($cmd)) {
            return array('error' => $this->error(self::ERROR_UNKNOWN_CMD));
        }

        // check request id
        $args['reqid'] = preg_replace('[^0-9a-fA-F]', '', !empty($args['reqid']) ? $args['reqid'] : (!empty($_SERVER['HTTP_X_ELFINDERREQID']) ? $_SERVER['HTTP_X_ELFINDERREQID'] : ''));

        // to abort this request
        if ($cmd === 'abort') {
            $this->abort($args);
            return array('error' => 0);
        }

        // make flag file and set self::$abortCheckFile
        if ($args['reqid']) {
            $this->abort(array('makeFile' => $args['reqid']));
        }

        if (!empty($args['mimes']) && is_array($args['mimes'])) {
            foreach ($this->volumes as $id => $v) {
                $this->volumes[$id]->setMimesFilter($args['mimes']);
            }
        }

        // regist shutdown function as fallback
        register_shutdown_function(array($this, 'itemAutoUnlock'));

        // detect destination dirHash and volume
        $dstVolume = false;
        $dst = !empty($args['target']) ? $args['target'] : (!empty($args['dst']) ? $args['dst'] : '');
        if ($dst) {
            $dstVolume = $this->volume($dst);
        } else if (isset($args['targets']) && is_array($args['targets']) && isset($args['targets'][0])) {
            $dst = $args['targets'][0];
            $dstVolume = $this->volume($dst);
            if ($dstVolume && ($_stat = $dstVolume->file($dst)) && !empty($_stat['phash'])) {
                $dst = $_stat['phash'];
            } else {
                $dst = '';
            }
        } else if ($cmd === 'open') {
            // for initial open without args `target`
            $dstVolume = $this->default;
            $dst = $dstVolume->defaultPath();
        }

        $result = null;

        // call pre handlers for this command
        $args['sessionCloseEarlier'] = isset($this->sessionUseCmds[$cmd]) ? false : $this->sessionCloseEarlier;
        if (!empty($this->listeners[$cmd . '.pre'])) {
            foreach ($this->listeners[$cmd . '.pre'] as $handler) {
                $_res = call_user_func_array($handler, array($cmd, &$args, $this, $dstVolume));
                if (is_array($_res)) {
                    if (!empty($_res['preventexec'])) {
                        $result = array('error' => true);
                        if ($cmd === 'upload' && !empty($args['node'])) {
                            $result['callback'] = array(
                                'node' => $args['node'],
                                'bind' => $cmd
                            );
                        }
                        if (!empty($_res['results']) && is_array($_res['results'])) {
                            $result = array_merge($result, $_res['results']);
                        }
                        break;
                    }
                }
            }
        }

        // unlock session data for multiple access
        if ($this->sessionCloseEarlier && $args['sessionCloseEarlier']) {
            $this->session->close();
            // deprecated property
            elFinder::$sessionClosed = true;
        }

        if (substr(PHP_OS, 0, 3) === 'WIN') {
            // set time out
            elFinder::extendTimeLimit(300);
        }

        if (!is_array($result)) {
            try {
                $result = $this->$cmd($args);
            } catch (elFinderAbortException $e) {
                throw $e;
            } catch (Exception $e) {
                $error_res = json_decode($e->getMessage());
                $message = isset($error_res->error->message) ? $error_res->error->message : $e->getMessage();
                $result = array(
                    'error' => htmlspecialchars($message),
                    'sync' => true
                );
                if ($this->throwErrorOnExec) {
                    throw $e;
                }
            }
        }

        // check change dstDir
        $changeDst = false;
        if ($dst && $dstVolume && (!empty($result['added']) || !empty($result['removed']))) {
            $changeDst = true;
        }

        foreach ($this->volumes as $volume) {
            $removed = $volume->removed();
            if (!empty($removed)) {
                if (!isset($result['removed'])) {
                    $result['removed'] = array();
                }
                $result['removed'] = array_merge($result['removed'], $removed);
                if (!$changeDst && $dst && $dstVolume && $volume === $dstVolume) {
                    $changeDst = true;
                }
            }
            $added = $volume->added();
            if (!empty($added)) {
                if (!isset($result['added'])) {
                    $result['added'] = array();
                }
                $result['added'] = array_merge($result['added'], $added);
                if (!$changeDst && $dst && $dstVolume && $volume === $dstVolume) {
                    $changeDst = true;
                }
            }
            $volume->resetResultStat();
        }

        // dstDir is changed
        if ($changeDst) {
            if ($dstDir = $dstVolume->dir($dst)) {
                if (!isset($result['changed'])) {
                    $result['changed'] = array();
                }
                $result['changed'][] = $dstDir;
            }
        }

        // call handlers for this command
        if (!empty($this->listeners[$cmd])) {
            foreach ($this->listeners[$cmd] as $handler) {
                if (call_user_func_array($handler, array($cmd, &$result, $args, $this, $dstVolume))) {
                    // handler return true to force sync client after command completed
                    $result['sync'] = true;
                }
            }
        }

        // replace removed files info with removed files hashes
        if (!empty($result['removed'])) {
            $removed = array();
            foreach ($result['removed'] as $file) {
                $removed[] = $file['hash'];
            }
            $result['removed'] = array_unique($removed);
        }
        // remove hidden files and filter files by mimetypes
        if (!empty($result['added'])) {
            $result['added'] = $this->filter($result['added']);
        }
        // remove hidden files and filter files by mimetypes
        if (!empty($result['changed'])) {
            $result['changed'] = $this->filter($result['changed']);
        }
        // add toasts
        if ($this->toastMessages) {
            $result['toasts'] = array_merge(((isset($result['toasts']) && is_array($result['toasts']))? $result['toasts'] : array()), $this->toastMessages);
        }

        if ($this->debug || !empty($args['debug'])) {
            $result['debug'] = array(
                'connector' => 'php',
                'phpver' => PHP_VERSION,
                'time' => $this->utime() - $this->time,
                'memory' => (function_exists('memory_get_peak_usage') ? ceil(memory_get_peak_usage() / 1024) . 'Kb / ' : '') . ceil(memory_get_usage() / 1024) . 'Kb / ' . ini_get('memory_limit'),
                'upload' => $this->uploadDebug,
                'volumes' => array(),
                'mountErrors' => $this->mountErrors
            );

            foreach ($this->volumes as $id => $volume) {
                $result['debug']['volumes'][] = $volume->debug();
            }
        }

        // remove sesstion var 'urlContentSaveIds'
        if ($this->removeContentSaveIds) {
            $urlContentSaveIds = $this->session->get('urlContentSaveIds', array());
            foreach (array_keys($this->removeContentSaveIds) as $contentSaveId) {
                if (isset($urlContentSaveIds[$contentSaveId])) {
                    unset($urlContentSaveIds[$contentSaveId]);
                }
            }
            if ($urlContentSaveIds) {
                $this->session->set('urlContentSaveIds', $urlContentSaveIds);
            } else {
                $this->session->remove('urlContentSaveIds');
            }
        }

        foreach ($this->volumes as $volume) {
            $volume->saveSessionCache();
            $volume->umount();
        }

        // unlock locked items
        $this->itemAutoUnlock();

        // custom data
        if ($this->customData !== null) {
            $result['customData'] = $this->customData ? json_encode($this->customData) : '';
        }

        if (!empty($result['debug'])) {
            $result['debug']['backendErrors'] = elFinder::$phpErrors;
        }
        elFinder::$phpErrors = array();
        restore_error_handler();

        if (!empty($result['callback'])) {
            $result['callback']['json'] = json_encode($result);
            $this->callback($result['callback']);
            return array();
        } else {
            return $result;
        }
    }

    /**
     * Return file real path
     *
     * @param  string $hash file hash
     *
     * @return string
     * @author Dmitry (dio) Levashov
     **/
    public function realpath($hash)
    {
        if (($volume = $this->volume($hash)) == false) {
            return false;
        }
        return $volume->realpath($hash);
    }

    /**
     * Sets custom data(s).
     *
     * @param  string|array $key The key or data array
     * @param  mixed        $val The value
     *
     * @return self    ( elFinder instance )
     */
    public function setCustomData($key, $val = null)
    {
        if (is_array($key)) {
            foreach ($key as $k => $v) {
                $this->customData[$k] = $v;
            }
        } else {
            $this->customData[$key] = $val;
        }
        return $this;
    }

    /**
     * Removes a custom data.
     *
     * @param  string $key The key
     *
     * @return self    ( elFinder instance )
     */
    public function removeCustomData($key)
    {
        $this->customData[$key] = null;
        return $this;
    }

    /**
     * Update sesstion value of a NetVolume option
     *
     * @param string $netKey
     * @param string $optionKey
     * @param mixed  $val
     *
     * @return bool
     */
    public function updateNetVolumeOption($netKey, $optionKey, $val)
    {
        $netVolumes = $this->getNetVolumes();
        if (is_string($netKey) && isset($netVolumes[$netKey]) && is_string($optionKey)) {
            $netVolumes[$netKey][$optionKey] = $val;
            $this->saveNetVolumes($netVolumes);
            return true;
        }
        return false;
    }

    /**
     * remove of session var "urlContentSaveIds"
     *
     * @param string $id
     */
    public function removeUrlContentSaveId($id)
    {
        $this->removeContentSaveIds[$id] = true;
    }

    /**
     * Return network volumes config.
     *
     * @return array
     * @author Dmitry (dio) Levashov
     */
    protected function getNetVolumes()
    {
        if ($data = $this->session->get('netvolume', array())) {
            return $data;
        }
        return array();
    }

    /**
     * Save network volumes config.
     *
     * @param  array $volumes volumes config
     *
     * @return void
     * @author Dmitry (dio) Levashov
     */
    protected function saveNetVolumes($volumes)
    {
        $this->session->set('netvolume', $volumes);
    }

    /**
     * Remove netmount volume
     *
     * @param string $key    netvolume key
     * @param object $volume volume driver instance
     *
     * @return bool
     */
    protected function removeNetVolume($key, $volume)
    {
        $netVolumes = $this->getNetVolumes();
        $res = true;
        if (is_object($volume) && method_exists($volume, 'netunmount')) {
            $res = $volume->netunmount($netVolumes, $key);
            $volume->clearSessionCache();
        }
        if ($res) {
            if (is_string($key) && isset($netVolumes[$key])) {
                unset($netVolumes[$key]);
                $this->saveNetVolumes($netVolumes);
                return true;
            }
        }
        return false;
    }

    /**
     * Get plugin instance & set to $this->plugins
     *
     * @param  string $name Plugin name (dirctory name)
     * @param  array  $opts Plugin options (optional)
     *
     * @return object | bool Plugin object instance Or false
     * @author Naoki Sawada
     */
    protected function getPluginInstance($name, $opts = array())
    {
        $key = strtolower($name);
        if (!isset($this->plugins[$key])) {
            $class = 'elFinderPlugin' . $name;
            // to try auto load
            if (!class_exists($class)) {
                $p_file = dirname(__FILE__) . DIRECTORY_SEPARATOR . 'plugins' . DIRECTORY_SEPARATOR . $name . DIRECTORY_SEPARATOR . 'plugin.php';
                if (is_file($p_file)) {
                    include_once $p_file;
                }
            }
            if (class_exists($class, false)) {
                $this->plugins[$key] = new $class($opts);
            } else {
                $this->plugins[$key] = false;
            }
        }
        return $this->plugins[$key];
    }

    /***************************************************************************/
    /*                                 commands                                */
    /***************************************************************************/

    /**
     * Normalize error messages
     *
     * @return array
     * @author Dmitry (dio) Levashov
     **/
    public function error()
    {
        $errors = array();

        foreach (func_get_args() as $msg) {
            if (is_array($msg)) {
                $errors = array_merge($errors, $msg);
            } else {
                $errors[] = $msg;
            }
        }

        return count($errors) ? $errors : array(self::ERROR_UNKNOWN);
    }

    /**
     * @param $args
     *
     * @return array
     * @throws elFinderAbortException
     */
    protected function netmount($args)
    {
        $options = array();
        $protocol = $args['protocol'];
        $toast = '';

        if ($protocol === 'netunmount') {
            if (!empty($args['user']) && $volume = $this->volume($args['user'])) {
                if ($this->removeNetVolume($args['host'], $volume)) {
                    return array('removed' => array(array('hash' => $volume->root())));
                }
            }
            return array('sync' => true, 'error' => $this->error(self::ERROR_NETUNMOUNT));
        }

        $driver = isset(self::$netDrivers[$protocol]) ? self::$netDrivers[$protocol] : '';
        $class = 'elFinderVolume' . $driver;

        if (!class_exists($class)) {
            return array('error' => $this->error(self::ERROR_NETMOUNT, $args['host'], self::ERROR_NETMOUNT_NO_DRIVER));
        }

        if (!$args['path']) {
            $args['path'] = '/';
        }

        foreach ($args as $k => $v) {
            if ($k != 'options' && $k != 'protocol' && $v) {
                $options[$k] = $v;
            }
        }

        if (is_array($args['options'])) {
            foreach ($args['options'] as $key => $value) {
                $options[$key] = $value;
            }
        }

        /* @var elFinderVolumeDriver $volume */
        $volume = new $class();

        // pass session handler
        $volume->setSession($this->session);

        $volume->setNeedOnline(true);

        if (is_callable(array($volume, 'netmountPrepare'))) {
            $options = $volume->netmountPrepare($options);
            if (isset($options['exit'])) {
                if ($options['exit'] === 'callback') {
                    $this->callback($options['out']);
                }
                return $options;
            }
            if (!empty($options['toast'])) {
                $toast = $options['toast'];
                unset($options['toast']);
            }
        }

        $netVolumes = $this->getNetVolumes();

        if (!isset($options['id'])) {
            // given fixed unique id
            if (!$options['id'] = $this->getNetVolumeUniqueId($netVolumes)) {
                return array('error' => $this->error(self::ERROR_NETMOUNT, $args['host'], 'Could\'t given volume id.'));
            }
        }

        // load additional volume root options
        if (!empty($this->optionsNetVolumes['*'])) {
            $options = array_merge($this->optionsNetVolumes['*'], $options);
        }
        if (!empty($this->optionsNetVolumes[$protocol])) {
            $options = array_merge($this->optionsNetVolumes[$protocol], $options);
        }

        if (!$key = $volume->netMountKey) {
            $key = md5($protocol . '-' . serialize($options));
        }
        $options['netkey'] = $key;

        if (!isset($netVolumes[$key]) && $volume->mount($options)) {
            // call post-process function of netmount
            if (is_callable(array($volume, 'postNetmount'))) {
                $volume->postNetmount($options);
            }
            $options['driver'] = $driver;
            $netVolumes[$key] = $options;
            $this->saveNetVolumes($netVolumes);
            $rootstat = $volume->file($volume->root());
            $res = array('added' => array($rootstat));
            if ($toast) {
                $res['toast'] = $toast;
            }
            return $res;
        } else {
            $this->removeNetVolume(null, $volume);
            return array('error' => $this->error(self::ERROR_NETMOUNT, $args['host'], implode(' ', $volume->error())));
        }
    }

    /**
     * "Open" directory
     * Return array with following elements
     *  - cwd          - opened dir info
     *  - files        - opened dir content [and dirs tree if $args[tree]]
     *  - api          - api version (if $args[init])
     *  - uplMaxSize   - if $args[init]
     *  - error        - on failed
     *
     * @param  array  command arguments
     *
     * @return array
     * @throws elFinderAbortException
     * @author Dmitry (dio) Levashov
     */
    protected function open($args)
    {
        $target = $args['target'];
        $init = !empty($args['init']);
        $tree = !empty($args['tree']);
        $volume = $this->volume($target);
        $cwd = $volume ? $volume->dir($target) : false;
        $hash = $init ? 'default folder' : '#' . $target;
        $compare = '';

        // on init request we can get invalid dir hash -
        // dir which can not be opened now, but remembered by client,
        // so open default dir
        if ((!$cwd || !$cwd['read']) && $init) {
            $volume = $this->default;
            $target = $volume->defaultPath();
            $cwd = $volume->dir($target);
        }

        if (!$cwd) {
            return array('error' => $this->error(self::ERROR_OPEN, $hash, self::ERROR_DIR_NOT_FOUND));
        }
        if (!$cwd['read']) {
            return array('error' => $this->error(self::ERROR_OPEN, $hash, self::ERROR_PERM_DENIED));
        }

        $files = array();

        // get current working directory files list
        if (($ls = $volume->scandir($cwd['hash'])) === false) {
            return array('error' => $this->error(self::ERROR_OPEN, $cwd['name'], $volume->error()));
        }

        if (isset($cwd['dirs']) && $cwd['dirs'] != 1) {
            $cwd = $volume->dir($target);
        }

        // get other volume root
        if ($tree) {
            foreach ($this->volumes as $id => $v) {
                $files[] = $v->file($v->root());
            }
        }

        // long polling mode
        if ($args['compare']) {
            $sleep = max(1, (int)$volume->getOption('lsPlSleep'));
            $standby = (int)$volume->getOption('plStandby');
            if ($standby > 0 && $sleep > $standby) {
                $standby = $sleep;
            }
            $limit = max(0, floor($standby / $sleep)) + 1;
            do {
                elFinder::extendTimeLimit(30 + $sleep);
                $_mtime = 0;
                foreach ($ls as $_f) {
                    if (isset($_f['ts'])) {
                        $_mtime = max($_mtime, $_f['ts']);
                    }
                }
                $compare = strval(count($ls)) . ':' . strval($_mtime);
                if ($compare !== $args['compare']) {
                    break;
                }
                if (--$limit) {
                    sleep($sleep);
                    $volume->clearstatcache();
                    if (($ls = $volume->scandir($cwd['hash'])) === false) {
                        break;
                    }
                }
            } while ($limit);
            if ($ls === false) {
                return array('error' => $this->error(self::ERROR_OPEN, $cwd['name'], $volume->error()));
            }
        }

        if ($ls) {
            if ($files) {
                $files = array_merge($files, $ls);
            } else {
                $files = $ls;
            }
        }

        $result = array(
            'cwd' => $cwd,
            'options' => $volume->options($cwd['hash']),
            'files' => $files
        );

        if ($compare) {
            $result['cwd']['compare'] = $compare;
        }

        if (!empty($args['init'])) {
            $result['api'] = sprintf('%.1F%03d', self::$ApiVersion, self::$ApiRevision);
            $result['uplMaxSize'] = ini_get('upload_max_filesize');
            $result['uplMaxFile'] = ini_get('max_file_uploads');
            $result['netDrivers'] = array_keys(self::$netDrivers);
            $result['maxTargets'] = $this->maxTargets;
            if ($volume) {
                $result['cwd']['root'] = $volume->root();
            }
            if (elfinder::$textMimes) {
                $result['textMimes'] = elfinder::$textMimes;
            }
        }

        return $result;
    }

    /**
     * Return dir files names list
     *
     * @param  array  command arguments
     *
     * @return array
     * @author Dmitry (dio) Levashov
     **/
    protected function ls($args)
    {
        $target = $args['target'];
        $intersect = isset($args['intersect']) ? $args['intersect'] : array();

        if (($volume = $this->volume($target)) == false
            || ($list = $volume->ls($target, $intersect)) === false) {
            return array('error' => $this->error(self::ERROR_OPEN, '#' . $target));
        }
        return array('list' => $list);
    }

    /**
     * Return subdirs for required directory
     *
     * @param  array  command arguments
     *
     * @return array
     * @author Dmitry (dio) Levashov
     **/
    protected function tree($args)
    {
        $target = $args['target'];

        if (($volume = $this->volume($target)) == false
            || ($tree = $volume->tree($target)) == false) {
            return array('error' => $this->error(self::ERROR_OPEN, '#' . $target));
        }

        return array('tree' => $tree);
    }

    /**
     * Return parents dir for required directory
     *
     * @param  array  command arguments
     *
     * @return array
     * @throws elFinderAbortException
     * @author Dmitry (dio) Levashov
     */
    protected function parents($args)
    {
        $target = $args['target'];
        $until = $args['until'];

        if (($volume = $this->volume($target)) == false
            || ($tree = $volume->parents($target, false, $until)) == false) {
            return array('error' => $this->error(self::ERROR_OPEN, '#' . $target));
        }

        return array('tree' => $tree);
    }

    /**
     * Return new created thumbnails list
     *
     * @param  array  command arguments
     *
     * @return array
     * @throws ImagickException
     * @throws elFinderAbortException
     * @author Dmitry (dio) Levashov
     */
    protected function tmb($args)
    {

        $result = array('images' => array());
        $targets = $args['targets'];

        foreach ($targets as $target) {
            elFinder::checkAborted();

            if (($volume = $this->volume($target)) != false
                && (($tmb = $volume->tmb($target)) != false)) {
                $result['images'][$target] = $tmb;
            }
        }
        return $result;
    }

    /**
     * Download files/folders as an archive file
     * 1st: Return srrsy contains download archive file info
     * 2nd: Return array contains opened file pointer, root itself and required headers
     *
     * @param  array  command arguments
     *
     * @return array
     * @throws Exception
     * @author Naoki Sawada
     */
    protected function zipdl($args)
    {
        $targets = $args['targets'];
        $download = !empty($args['download']);
        $h404 = 'HTTP/1.x 404 Not Found';
        $CriOS = isset($_SERVER['HTTP_USER_AGENT'])? (strpos($_SERVER['HTTP_USER_AGENT'], 'CriOS') !== false) : false;

        if (!$download) {
            //1st: Return array contains download archive file info
            $error = array(self::ERROR_ARCHIVE);
            if (($volume = $this->volume($targets[0])) !== false) {
                if ($dlres = $volume->zipdl($targets)) {
                    $path = $dlres['path'];
                    register_shutdown_function(array('elFinder', 'rmFileInDisconnected'), $path);
                    if (count($targets) === 1) {
                        $name = basename($volume->path($targets[0]));
                    } else {
                        $name = $dlres['prefix'] . '_Files';
                    }
                    $name .= '.' . $dlres['ext'];
                    $uniqid = uniqid();
					if(ZEND_THREAD_SAFE){
						set_transient("zipdl$uniqid", basename($path),MINUTE_IN_SECONDS);
					} else {
						$this->session->set('zipdl' . $uniqid, basename($path));
					}
                    $result = array(
                        'zipdl' => array(
                            'file' => $CriOS? basename($path) : $uniqid,
                            'name' => $name,
                            'mime' => $dlres['mime']
                        )
                    );
                    return $result;
                }
                $error = array_merge($error, $volume->error());
            }
            return array('error' => $error);
        } else {
            // 2nd: Return array contains opened file session key, root itself and required headers

            // Detect Chrome on iOS
            // It has access twice on downloading
            $CriOSinit = false;
            if ($CriOS) {
                $accept = isset($_SERVER['HTTP_ACCEPT'])? $_SERVER['HTTP_ACCEPT'] : '';
                if ($accept && $accept !== '*' && $accept !== '*/*') {
                    $CriOSinit = true;
                }
            }
            // data check
            if (count($targets) !== 4 || ($volume = $this->volume($targets[0])) == false || !($file = $CriOS? $targets[1] : ( ZEND_THREAD_SAFE ? get_transient( "zipdl$targets[1]" ) : $this->session->get('zipdl' . $targets[1] ) ) )) {
                return array('error' => 'File not found', 'header' => $h404, 'raw' => true);
            }
            $path = $volume->getTempPath() . DIRECTORY_SEPARATOR . basename($file);
            // remove session data of "zipdl..."
	        if(ZEND_THREAD_SAFE){
		        delete_transient("zipdl$targets[1]");
	        } else {
		        $this->session->remove('zipdl' . $targets[1]);
	        }
            if (!$CriOSinit) {
                // register auto delete on shutdown
                $GLOBALS['elFinderTempFiles'][$path] = true;
            }
            if ($volume->commandDisabled('zipdl')) {
                return array('error' => 'File not found', 'header' => $h404, 'raw' => true);
            }
            if (!is_readable($path) || !is_writable($path)) {
                return array('error' => 'File not found', 'header' => $h404, 'raw' => true);
            }
            // for HTTP headers
            $name = $targets[2];
            $mime = $targets[3];

            $filenameEncoded = rawurlencode($name);
            if (strpos($filenameEncoded, '%') === false) { // ASCII only
                $filename = 'filename="' . $name . '"';
            } else {
                $ua = $_SERVER['HTTP_USER_AGENT'];
                if (preg_match('/MSIE [4-8]/', $ua)) { // IE < 9 do not support RFC 6266 (RFC 2231/RFC 5987)
                    $filename = 'filename="' . $filenameEncoded . '"';
                } elseif (strpos($ua, 'Chrome') === false && strpos($ua, 'Safari') !== false && preg_match('#Version/[3-5]#', $ua)) { // Safari < 6
                    $filename = 'filename="' . str_replace('"', '', $name) . '"';
                } else { // RFC 6266 (RFC 2231/RFC 5987)
                    $filename = 'filename*=UTF-8\'\'' . $filenameEncoded;
                }
            }

            $fp = fopen($path, 'rb');
            $file = fstat($fp);
            $result = array(
                'pointer' => $fp,
                'header' => array(
                    'Content-Type: ' . $mime,
                    'Content-Disposition: attachment; ' . $filename,
                    'Content-Transfer-Encoding: binary',
                    'Content-Length: ' . $file['size'],
                    'Accept-Ranges: none',
                    'Connection: close'
                )
            );
            // add cache control headers
            if ($cacheHeaders = $volume->getOption('cacheHeaders')) {
                $result['header'] = array_merge($result['header'], $cacheHeaders);
            }
            return $result;
        }
    }

    /**
     * Required to output file in browser when volume URL is not set
     * Return array contains opened file pointer, root itself and required headers
     *
     * @param  array  command arguments
     *
     * @return array
     * @throws elFinderAbortException
     * @author Dmitry (dio) Levashov
     */
    protected function file($args)
    {
        $target = $args['target'];
        $download = !empty($args['download']);
        $onetime = !empty($args['onetime']);
        //$h304     = 'HTTP/1.1 304 Not Modified';
        $h403 = 'HTTP/1.0 403 Access Denied';
        $a403 = array('error' => 'Access Denied', 'header' => $h403, 'raw' => true);
        $h404 = 'HTTP/1.0 404 Not Found';
        $a404 = array('error' => 'File not found', 'header' => $h404, 'raw' => true);

        if ($onetime) {
            $volume = null;
            $tmpdir = elFinder::$commonTempPath;
            if (!$tmpdir || !is_file($tmpf = $tmpdir . DIRECTORY_SEPARATOR . 'ELF' . $target)) {
                return $a404;
            }
            $GLOBALS['elFinderTempFiles'][$tmpf] = true;
            if ($file = json_decode(file_get_contents($tmpf), true)) {
                $src = base64_decode($file['file']);
                if (!is_file($src) || !($fp = fopen($src, 'rb'))) {
                    return $a404;
                }
                if (strpos($src, $tmpdir) === 0) {
                    $GLOBALS['elFinderTempFiles'][$src] = true;
                }
                unset($file['file']);
                $file['read'] = true;
                $file['size'] = filesize($src);
            } else {
                return $a404;
            }
        } else {
            if (($volume = $this->volume($target)) == false) {
                return $a404;
            }

            if ($volume->commandDisabled('file')) {
                return $a403;
            }

            if (($file = $volume->file($target)) == false) {
                return $a404;
            }

            if (!$file['read']) {
                return $a404;
            }

            $opts = array();
            if (!empty($_SERVER['HTTP_RANGE'])) {
                $opts['httpheaders'] = array('Range: ' . $_SERVER['HTTP_RANGE']);
            }
            if (($fp = $volume->open($target, $opts)) == false) {
                return $a404;
            }
        }

        // check aborted by user
        elFinder::checkAborted();

        // allow change MIME type by 'file.pre' callback functions
        $mime = isset($args['mime']) ? $args['mime'] : $file['mime'];
        if ($download || $onetime) {
            $disp = 'attachment';
        } else {
            $dispInlineRegex = $volume->getOption('dispInlineRegex');
            $inlineRegex = false;
            if ($dispInlineRegex) {
                $inlineRegex = '#' . str_replace('#', '\\#', $dispInlineRegex) . '#';
                try {
                    preg_match($inlineRegex, '');
                } catch (Exception $e) {
                    $inlineRegex = false;
                }
            }
            if (!$inlineRegex) {
                $inlineRegex = '#^(?:(?:image|text)|application/x-shockwave-flash$)#';
            }
            $disp = preg_match($inlineRegex, $mime) ? 'inline' : 'attachment';
        }

        $filenameEncoded = rawurlencode($file['name']);
        if (strpos($filenameEncoded, '%') === false) { // ASCII only
            $filename = 'filename="' . $file['name'] . '"';
        } else {
            $ua = isset($_SERVER['HTTP_USER_AGENT'])? $_SERVER['HTTP_USER_AGENT'] : '';
            if (preg_match('/MSIE [4-8]/', $ua)) { // IE < 9 do not support RFC 6266 (RFC 2231/RFC 5987)
                $filename = 'filename="' . $filenameEncoded . '"';
            } elseif (strpos($ua, 'Chrome') === false && strpos($ua, 'Safari') !== false && preg_match('#Version/[3-5]#', $ua)) { // Safari < 6
                $filename = 'filename="' . str_replace('"', '', $file['name']) . '"';
            } else { // RFC 6266 (RFC 2231/RFC 5987)
                $filename = 'filename*=UTF-8\'\'' . $filenameEncoded;
            }
        }

        if ($args['cpath'] && $args['reqid']) {
            setcookie('elfdl' . $args['reqid'], '1', 0, $args['cpath']);
        }

        $result = array(
            'volume' => $volume,
            'pointer' => $fp,
            'info' => $file,
            'header' => array(
                'Content-Type: ' . $mime,
                'Content-Disposition: ' . $disp . '; ' . $filename,
                'Content-Transfer-Encoding: binary',
                'Content-Length: ' . $file['size'],
                'Last-Modified: ' . gmdate('D, d M Y H:i:s T', $file['ts']),
                'Connection: close'
            )
        );

        if (!$onetime) {
            // add cache control headers
            if ($cacheHeaders = $volume->getOption('cacheHeaders')) {
                $result['header'] = array_merge($result['header'], $cacheHeaders);
            }

            // check 'xsendfile'
            $xsendfile = $volume->getOption('xsendfile');
            $path = null;
            if ($xsendfile) {
                $info = stream_get_meta_data($fp);
                if ($path = empty($info['uri']) ? null : $info['uri']) {
                    $basePath = rtrim($volume->getOption('xsendfilePath'), DIRECTORY_SEPARATOR);
                    if ($basePath) {
                        $root = rtrim($volume->getRootPath(), DIRECTORY_SEPARATOR);
                        if (strpos($path, $root) === 0) {
                            $path = $basePath . substr($path, strlen($root));
                        } else {
                            $path = null;
                        }
                    }
                }
            }
            if ($path) {
                $result['header'][] = $xsendfile . ': ' . $path;
                $result['info']['xsendfile'] = $xsendfile;
            }
        }

        // add "Content-Location" if file has url data
        if (isset($file['url']) && $file['url'] && $file['url'] != 1) {
            $result['header'][] = 'Content-Location: ' . $file['url'];
        }
        return $result;
    }

    /**
     * Count total files size
     *
     * @param  array  command arguments
     *
     * @return array
     * @throws elFinderAbortException
     * @author Dmitry (dio) Levashov
     */
    protected function size($args)
    {
        $size = 0;
        $files = 0;
        $dirs = 0;
        $itemCount = true;
        $sizes = array();

        foreach ($args['targets'] as $target) {
            elFinder::checkAborted();
            if (($volume = $this->volume($target)) == false
                || ($file = $volume->file($target)) == false
                || !$file['read']) {
                return array('error' => $this->error(self::ERROR_OPEN, '#' . $target));
            }

            $volRes = $volume->size($target);
            if (is_array($volRes)) {
                $sizeInfo = array('size' => 0, 'fileCnt' => 0, 'dirCnt' => 0);
                if (!empty($volRes['size'])) {
                    $sizeInfo['size'] = $volRes['size'];
                    $size += $volRes['size'];
                }
                if (!empty($volRes['files'])) {
                    $sizeInfo['fileCnt'] = $volRes['files'];
                }
                if (!empty($volRes['dirs'])) {
                    $sizeInfo['dirCnt'] = $volRes['dirs'];
                }
                if ($itemCount) {
                    $files += $sizeInfo['fileCnt'];
                    $dirs += $sizeInfo['dirCnt'];
                }
                $sizes[$target] = $sizeInfo;
            } else if (is_numeric($volRes)) {
                $size += $volRes;
                $files = $dirs = 'unknown';
                $itemCount = false;
            }
        }
        return array('size' => $size, 'fileCnt' => $files, 'dirCnt' => $dirs, 'sizes' => $sizes);
    }

    /**
     * Create directory
     *
     * @param  array  command arguments
     *
     * @return array
     * @author Dmitry (dio) Levashov
     **/
    protected function mkdir($args)
    {
        $target = $args['target'];
        $name = $args['name'];
        $dirs = $args['dirs'];
        if ($name === '' && !$dirs) {
            return array('error' => $this->error(self::ERROR_INV_PARAMS, 'mkdir'));
        }

        if (strpos($name,'..') !== false) {
            return array('error' => $this->error('Invalid request', 'mkdir'));
        }

        if (($volume = $this->volume($target)) == false) {
            return array('error' => $this->error(self::ERROR_MKDIR, $name, self::ERROR_TRGDIR_NOT_FOUND, '#' . $target));
        }
        if ($dirs) {
            $maxDirs = $volume->getOption('uploadMaxMkdirs');
            if ($maxDirs && $maxDirs < count($dirs)) {
                return array('error' => $this->error(self::ERROR_MAX_MKDIRS, $maxDirs));
            }
            sort($dirs);
            $reset = null;
            $mkdirs = array();
            foreach ($dirs as $dir) {
                if(strpos($dir,'..') !== false){
                    return array('error' => $this->error('Invalid request', 'mkdir'));
                }
                $tgt =& $mkdirs;
                $_names = explode('/', trim($dir, '/'));
                foreach ($_names as $_key => $_name) {
                    if (!isset($tgt[$_name])) {
                        $tgt[$_name] = array();
                    }
                    $tgt =& $tgt[$_name];
                }
                $tgt =& $reset;
            }
            $res = $this->ensureDirsRecursively($volume, $target, $mkdirs);
            $ret = array(
                'added' => $res['stats'],
                'hashes' => $res['hashes']
            );
            if ($res['error']) {
                $ret['warning'] = $this->error(self::ERROR_MKDIR, $res['error'][0], $volume->error());
            }
            return $ret;
        } else {
            return ($dir = $volume->mkdir($target, $name)) == false
                ? array('error' => $this->error(self::ERROR_MKDIR, $name, $volume->error()))
                : array('added' => array($dir));
        }
    }

    /**
     * Create empty file
     *
     * @param  array  command arguments
     *
     * @return array
     * @author Dmitry (dio) Levashov
     **/
    protected function mkfile($args)
    {
        $target = $args['target'];
        $name = str_replace('..', '', $args['name']);

        if (($volume = $this->volume($target)) == false) {
            return array('error' => $this->error(self::ERROR_MKFILE, $name, self::ERROR_TRGDIR_NOT_FOUND, '#' . $target));
        }

        return ($file = $volume->mkfile($target, $name)) == false
            ? array('error' => $this->error(self::ERROR_MKFILE, $name, $volume->error()))
            : array('added' => array($file));
    }

    /**
     * Rename file, Accept multiple items >= API 2.1031
     *
     * @param  array $args
     *
     * @return array
     * @throws elFinderAbortException
     * @author Dmitry (dio) Levashov
     * @author Naoki Sawada
     */
    protected function rename($args)
    {
        $target = $args['target'];
        $name = $args['name'];
        $query = (!empty($args['q']) && strpos($args['q'], '*') !== false) ? $args['q'] : '';
        $targets = !empty($args['targets'])? $args['targets'] : false;
        $rms = array();
        $notfounds = array();
        $locked = array();
        $errs = array();
        $files = array();
        $removed = array();
        $res = array();
        $type = 'normal';

        if (!($volume = $this->volume($target))) {
            return array('error' => $this->error(self::ERROR_RENAME, '#' . $target, self::ERROR_FILE_NOT_FOUND));
        }

        if (strpos($name,'..') !== false) {
            return array('error' => $this->error('Invalid request', 'rename'));
        }

        if ($targets) {
            array_unshift($targets, $target);
            foreach ($targets as $h) {
                if ($rm = $volume->file($h)) {
                    if ($this->itemLocked($h)) {
                        $locked[] = $rm['name'];
                    } else {
                        $rm['realpath'] = $volume->realpath($h);
                        $rms[] = $rm;
                    }
                } else {
                    $notfounds[] = '#' . $h;
                }
            }
            if (!$rms) {
                $res['error'] = array();
                if ($notfounds) {
                    $res['error'] = array(self::ERROR_RENAME, join(', ', $notfounds), self::ERROR_FILE_NOT_FOUND);
                }
                if ($locked) {
                    array_push($res['error'], self::ERROR_LOCKED, join(', ', $locked));
                }
                return $res;
            }

            $res['warning'] = array();
            if ($notfounds) {
                array_push($res['warning'], self::ERROR_RENAME, join(', ', $notfounds), self::ERROR_FILE_NOT_FOUND);
            }
            if ($locked) {
                array_push($res['warning'], self::ERROR_LOCKED, join(', ', $locked));
            }

            if ($query) {
                // batch rename
                $splits = elFinder::splitFileExtention($query);
                if ($splits[1] && $splits[0] === '*') {
                    $type = 'extention';
                    $name = $splits[1];
                } else if (strlen($splits[0]) > 1) {
                    if (substr($splits[0], -1) === '*') {
                        $type = 'prefix';
                        $name = substr($splits[0], 0, strlen($splits[0]) - 1);
                    } else if (substr($splits[0], 0, 1) === '*') {
                        $type = 'suffix';
                        $name = substr($splits[0], 1);
                    }
                }
                if ($type !== 'normal') {
                    if (!empty($this->listeners['rename.pre'])) {
                        $_args = array('name' => $name);
                        foreach ($this->listeners['rename.pre'] as $handler) {
                            $_res = call_user_func_array($handler, array('rename', &$_args, $this, $volume));
                            if (!empty($_res['preventexec'])) {
                                break;
                            }
                        }
                        $name = $_args['name'];
                    }
                }
            }
            foreach ($rms as $rm) {
                if ($type === 'normal') {
                    $rname = $volume->uniqueName($volume->realpath($rm['phash']), $name, '', false);
                } else {
                    $rname = $name;
                    if ($type === 'extention') {
                        $splits = elFinder::splitFileExtention($rm['name']);
                        $rname = $splits[0] . '.' . $name;
                    } else if ($type === 'prefix') {
                        $rname = $name . $rm['name'];
                    } else if ($type === 'suffix') {
                        $splits = elFinder::splitFileExtention($rm['name']);
                        $rname = $splits[0] . $name . ($splits[1] ? ('.' . $splits[1]) : '');
                    }
                    $rname = $volume->uniqueName($volume->realpath($rm['phash']), $rname, '', true);
                }
                if ($file = $volume->rename($rm['hash'], $rname)) {
                    $files[] = $file;
                    $removed[] = $rm;
                } else {
                    $errs[] = $rm['name'];
                }
            }

            if (!$files) {
                $res['error'] = $this->error(self::ERROR_RENAME, join(', ', $errs), $volume->error());
                if (!$res['warning']) {
                    unset($res['warning']);
                }
                return $res;
            }
            if ($errs) {
                array_push($res['warning'], self::ERROR_RENAME, join(', ', $errs), $volume->error());
            }
            if (!$res['warning']) {
                unset($res['warning']);
            }
            $res['added'] = $files;
            $res['removed'] = $removed;
            return $res;
        } else {
            if (!($rm = $volume->file($target))) {
                return array('error' => $this->error(self::ERROR_RENAME, '#' . $target, self::ERROR_FILE_NOT_FOUND));
            }
            if ($this->itemLocked($target)) {
                return array('error' => $this->error(self::ERROR_LOCKED, $rm['name']));
            }
            $rm['realpath'] = $volume->realpath($target);

            $file = $volume->rename($target, $name);
            if ($file === false) {
                return array('error' => $this->error(self::ERROR_RENAME, $rm['name'], $volume->error()));
            } else {
                if ($file['hash'] !== $rm['hash']) {
                    return array('added' => array($file), 'removed' => array($rm));
                } else {
                    return array('changed' => array($file));
                }
            }
        }
    }

    /**
     * Duplicate file - create copy with "copy %d" suffix
     *
     * @param array $args command arguments
     *
     * @return array
     * @throws elFinderAbortException
     * @author Dmitry (dio) Levashov
     */
    protected function duplicate($args)
    {
        $targets = is_array($args['targets']) ? $args['targets'] : array();
        $result = array();
        $suffix = empty($args['suffix']) ? 'copy' : $args['suffix'];

        $this->itemLock($targets);

        foreach ($targets as $target) {
            elFinder::checkAborted();

            if (($volume = $this->volume($target)) == false
                || ($src = $volume->file($target)) == false) {
                $result['warning'] = $this->error(self::ERROR_COPY, '#' . $target, self::ERROR_FILE_NOT_FOUND);
                break;
            }

            if (($file = $volume->duplicate($target, $suffix)) == false) {
                $result['warning'] = $this->error($volume->error());
                break;
            }
        }

        return $result;
    }

    /**
     * Remove dirs/files
     *
     * @param array  command arguments
     *
     * @return array
     * @throws elFinderAbortException
     * @author Dmitry (dio) Levashov
     */
    protected function rm($args)
    {
        $targets = is_array($args['targets']) ? $args['targets'] : array();
        $result = array('removed' => array());

        foreach ($targets as $target) {
            elFinder::checkAborted();

            if (($volume = $this->volume($target)) == false) {
                $result['warning'] = $this->error(self::ERROR_RM, '#' . $target, self::ERROR_FILE_NOT_FOUND);
                break;
            }

            if ($this->itemLocked($target)) {
                $rm = $volume->file($target);
                $result['warning'] = $this->error(self::ERROR_LOCKED, $rm['name']);
                break;
            }

            if (!$volume->rm($target)) {
                $result['warning'] = $this->error($volume->error());
                break;
            }
        }

        return $result;
    }

    /**
     * Return has subdirs
     *
     * @param  array  command arguments
     *
     * @return array
     * @author Dmitry Naoki Sawada
     **/
    protected function subdirs($args)
    {

        $result = array('subdirs' => array());
        $targets = $args['targets'];

        foreach ($targets as $target) {
            if (($volume = $this->volume($target)) !== false) {
                $result['subdirs'][$target] = $volume->subdirs($target) ? 1 : 0;
            }
        }
        return $result;
    }

    /**
     * Gateway for custom contents editor
     *
     * @param  array $args command arguments
     *
     * @return array
     * @author Naoki Sawada
     */
    protected function editor($args = array())
    {
        /* @var elFinderEditor $editor */
        $name = $args['name'];
        if (is_array($name)) {
            $res = array();
            foreach ($name as $c) {
                $class = 'elFinderEditor' . $c;
                if (class_exists($class)) {
                    $editor = new $class($this, $args['args']);
                    $res[$c] = $editor->enabled();
                } else {
                    $res[$c] = 0;
                }
            }
            return $res;
        } else {
            $class = 'elFinderEditor' . $name;
            $method = '';
            if (class_exists($class)) {
                $editor = new $class($this, $args['args']);
                $method = $args['method'];
                if ($editor->isAllowedMethod($method) && method_exists($editor, $method)) {
                    return $editor->$method();
                }
            }
            return array('error', $this->error(self::ERROR_UNKNOWN_CMD, 'editor.' . $name . '.' . $method));
        }
    }

    /**
     * Abort current request and make flag file to running check
     *
     * @param array $args
     *
     * @return void
     */
    protected function abort($args = array())
    {
        if (!elFinder::$connectionFlagsPath || $_SERVER['REQUEST_METHOD'] === 'HEAD') {
            return;
        }
        $flagFile = elFinder::$connectionFlagsPath . DIRECTORY_SEPARATOR . 'elfreq%s';
        if (!empty($args['makeFile'])) {
            self::$abortCheckFile = sprintf($flagFile, self::filenameDecontaminate($args['makeFile']));
            touch(self::$abortCheckFile);
            $GLOBALS['elFinderAbortFiles'][self::$abortCheckFile] = true;
            return;
        }

        $file = !empty($args['id']) ? sprintf($flagFile, self::filenameDecontaminate($args['id'])) : self::$abortCheckFile;
        $file && is_file($file) && unlink($file);
    }

    /**
     * Validate an URL to prevent SSRF attacks.
     *
     * To prevent any risk of DNS rebinding, always use the IP address resolved by
     * this method, as returned in the array entry `ip`.
     *
     * @param string $url
     *
     * @return false|array
     */
    protected function validate_address($url)
    {
        $info = parse_url($url);
        $host = trim(strtolower($info['host']), '.');
        // do not support IPv6 address
        if (preg_match('/^\[.*\]$/', $host)) {
            return false;
        }
        // do not support non dot host
        if (strpos($host, '.') === false) {
            return false;
        }
        // do not support URL-encoded host
        if (strpos($host, '%') !== false) {
            return false;
        }
        // disallow including "localhost" and "localdomain"
        if (preg_match('/\b(?:localhost|localdomain)\b/', $host)) {
            return false;
        }
        // check IPv4 local loopback, private network and link local
        $ip = gethostbyname($host);
        if (preg_match('/^0x[0-9a-f]+|[0-9]+(?:\.(?:0x[0-9a-f]+|[0-9]+)){1,3}$/', $ip, $m)) {
            $long = (int)sprintf('%u', ip2long($ip));
            if (!$long) {
                return false;
            }
            $local = (int)sprintf('%u', ip2long('127.255.255.255')) >> 24;
            $prv1  = (int)sprintf('%u', ip2long('10.255.255.255')) >> 24;
            $prv2  = (int)sprintf('%u', ip2long('172.31.255.255')) >> 20;
            $prv3  = (int)sprintf('%u', ip2long('192.168.255.255')) >> 16;
            $link  = (int)sprintf('%u', ip2long('169.254.255.255')) >> 16;

            if (!isset($this->uploadAllowedLanIpClasses['local']) && $long >> 24 === $local) {
                return false;
            }
            if (!isset($this->uploadAllowedLanIpClasses['private_a']) && $long >> 24 === $prv1) {
                return false;
            }
            if (!isset($this->uploadAllowedLanIpClasses['private_b']) && $long >> 20 === $prv2) {
                return false;
            }
            if (!isset($this->uploadAllowedLanIpClasses['private_c']) && $long >> 16 === $prv3) {
                return false;
            }
            if (!isset($this->uploadAllowedLanIpClasses['link']) && $long >> 16 === $link) {
                return false;
            }
            $info['ip'] = long2ip($long);
            if (!isset($info['port'])) {
                $info['port'] = $info['scheme'] === 'https' ? 443 : 80;
            }
            if (!isset($info['path'])) {
                $info['path'] = '/';
            }
            return $info;
        } else {
            return false;
        }
    }

    /**
     * Get remote contents
     *
     * @param  string   $url          target url
     * @param  int      $timeout      timeout (sec)
     * @param  int      $redirect_max redirect max count
     * @param  string   $ua
     * @param  resource $fp
     *
     * @return string, resource or bool(false)
     * @retval  string contents
     * @retval  resource conttents
     * @rettval false  error
     * @author  Naoki Sawada
     **/
    protected function get_remote_contents(&$url, $timeout = 30, $redirect_max = 5, $ua = 'Mozilla/5.0', $fp = null)
    {
        if (preg_match('~^(?:ht|f)tps?://[-_.!\~*\'()a-z0-9;/?:\@&=+\$,%#\*\[\]]+~i', $url)) {
            $info = $this->validate_address($url);
            if ($info === false) {
                return false;
            }
            // dose not support 'user' and 'pass' for security reasons
            $url = $info['scheme'].'://'.$info['host'].(!empty($info['port'])? (':'.$info['port']) : '').$info['path'].(!empty($info['query'])? ('?'.$info['query']) : '').(!empty($info['fragment'])? ('#'.$info['fragment']) : '');
            // check by URL upload filter
            if ($this->urlUploadFilter && is_callable($this->urlUploadFilter)) {
                if (!call_user_func_array($this->urlUploadFilter, array($url, $this))) {
                    return false;
                }
            }
            $method = (function_exists('curl_exec')) ? 'curl_get_contents' : 'fsock_get_contents';
            return $this->$method($url, $timeout, $redirect_max, $ua, $fp, $info);
        }
        return false;
    }

    /**
     * Get remote contents with cURL
     *
     * @param  string   $url          target url
     * @param  int      $timeout      timeout (sec)
     * @param  int      $redirect_max redirect max count
     * @param  string   $ua
     * @param  resource $outfp
     *
     * @return string, resource or bool(false)
     * @retval string contents
     * @retval resource conttents
     * @retval false  error
     * @author Naoki Sawada
     **/
    protected function curl_get_contents(&$url, $timeout, $redirect_max, $ua, $outfp, $info)
    {
        if ($redirect_max == 0) {
            return false;
        }
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_HEADER, false);
        if ($outfp) {
            curl_setopt($ch, CURLOPT_FILE, $outfp);
        } else {
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        }
        curl_setopt($ch, CURLOPT_LOW_SPEED_LIMIT, 1);
        curl_setopt($ch, CURLOPT_LOW_SPEED_TIME, $timeout);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false);
        curl_setopt($ch, CURLOPT_USERAGENT, $ua);
        curl_setopt($ch, CURLOPT_RESOLVE, array($info['host'] . ':' . $info['port'] . ':' . $info['ip']));
        $result = curl_exec($ch);
        $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if ($http_code == 301 || $http_code == 302) {
            $new_url = curl_getinfo($ch, CURLINFO_REDIRECT_URL);
            $info = $this->validate_address($new_url);
            if ($info === false) {
                return false;
            }
            return $this->curl_get_contents($new_url, $timeout, $redirect_max - 1, $ua, $outfp, $info);
        }
        curl_close($ch);
        return $outfp ? $outfp : $result;
    }

    /**
     * Get remote contents with fsockopen()
     *
     * @param  string   $url          url
     * @param  int      $timeout      timeout (sec)
     * @param  int      $redirect_max redirect max count
     * @param  string   $ua
     * @param  resource $outfp
     *
     * @return string, resource or bool(false)
     * @retval string contents
     * @retval resource conttents
     * @retval false  error
     * @throws elFinderAbortException
     * @author Naoki Sawada
     */
    protected function fsock_get_contents(&$url, $timeout, $redirect_max, $ua, $outfp, $info)
    {
        $connect_timeout = 3;
        $connect_try = 3;
        $method = 'GET';
        $readsize = 4096;
        $ssl = '';

        $getSize = null;
        $headers = '';

        $arr = $info;
        if ($arr['scheme'] === 'https') {
            $ssl = 'ssl://';
        }

        // query
        $arr['query'] = isset($arr['query']) ? '?' . $arr['query'] : '';

        $url_base = $arr['scheme'] . '://' . $info['host'] . ':' . $info['port'];
        $url_path = isset($arr['path']) ? $arr['path'] : '/';
        $uri = $url_path . $arr['query'];

        $query = $method . ' ' . $uri . " HTTP/1.0\r\n";
        $query .= "Host: " . $arr['host'] . "\r\n";
        $query .= "Accept: */*\r\n";
        $query .= "Connection: close\r\n";
        if (!empty($ua)) $query .= "User-Agent: " . $ua . "\r\n";
        if (!is_null($getSize)) $query .= 'Range: bytes=0-' . ($getSize - 1) . "\r\n";

        $query .= $headers;

        $query .= "\r\n";

        $fp = $connect_try_count = 0;
        while (!$fp && $connect_try_count < $connect_try) {

            $errno = 0;
            $errstr = "";
            $fp = fsockopen(
                $ssl . $arr['host'],
                $arr['port'],
                $errno, $errstr, $connect_timeout);
            if ($fp) break;
            $connect_try_count++;
            if (connection_aborted()) {
                throw new elFinderAbortException();
            }
            sleep(1); // wait 1sec
        }

        if (!$fp) {
            return false;
        }

        $fwrite = 0;
        for ($written = 0; $written < strlen($query); $written += $fwrite) {
            $fwrite = fwrite($fp, substr($query, $written));
            if (!$fwrite) {
                break;
            }
        }

        if ($timeout) {
            socket_set_timeout($fp, $timeout);
        }

        $_response = '';
        $header = '';
        while ($_response !== "\r\n") {
            $_response = fgets($fp, $readsize);
            $header .= $_response;
        };

        $rccd = array_pad(explode(' ', $header, 2), 2, ''); // array('HTTP/1.1','200')
        $rc = (int)$rccd[1];

        $ret = false;
        // Redirect
        switch ($rc) {
            case 307: // Temporary Redirect
            case 303: // See Other
            case 302: // Moved Temporarily
            case 301: // Moved Permanently
                $matches = array();
                if (preg_match('/^Location: (.+?)(#.+)?$/im', $header, $matches) && --$redirect_max > 0) {
                    $_url = $url;
                    $url = trim($matches[1]);
                    if (!preg_match('/^https?:\//', $url)) { // no scheme
                        if ($url[0] != '/') { // Relative path
                            // to Absolute path
                            $url = substr($url_path, 0, strrpos($url_path, '/')) . '/' . $url;
                        }
                        // add sheme,host
                        $url = $url_base . $url;
                    }
                    if ($_url === $url) {
                        sleep(1);
                    }
                    fclose($fp);
                    $info = $this->validate_address($url);
                    if ($info === false) {
                        return false;
                    }
                    return $this->fsock_get_contents($url, $timeout, $redirect_max, $ua, $outfp, $info);
                }
                break;
            case 200:
                $ret = true;
        }
        if (!$ret) {
            fclose($fp);
            return false;
        }

        $body = '';
        if (!$outfp) {
            $outfp = fopen('php://temp', 'rwb');
            $body = true;
        }
        while (fwrite($outfp, fread($fp, $readsize))) {
            if ($timeout) {
                $_status = socket_get_status($fp);
                if ($_status['timed_out']) {
                    fclose($outfp);
                    fclose($fp);
                    return false; // Request Time-out
                }
            }
        }
        if ($body) {
            rewind($outfp);
            $body = stream_get_contents($outfp);
            fclose($outfp);
            $outfp = null;
        }

        fclose($fp);

        return $outfp ? $outfp : $body; // Data
    }

    /**
     * Parse Data URI scheme
     *
     * @param  string $str
     * @param  array  $extTable
     * @param  array  $args
     *
     * @return array
     * @author Naoki Sawada
     */
    protected function parse_data_scheme($str, $extTable, $args = null)
    {
        $data = $name = $mime = '';
        // Scheme 'data://' require `allow_url_fopen` and `allow_url_include`
        if ($fp = fopen('data://' . substr($str, 5), 'rb')) {
            if ($data = stream_get_contents($fp)) {
                $meta = stream_get_meta_data($fp);
                $mime = $meta['mediatype'];
            }
            fclose($fp);
        } else if (preg_match('~^data:(.+?/.+?)?(?:;charset=.+?)?;base64,~', substr($str, 0, 128), $m)) {
            $data = base64_decode(substr($str, strlen($m[0])));
            if ($m[1]) {
                $mime = $m[1];
            }
        }
        if ($data) {
            $ext = ($mime && isset($extTable[$mime])) ? '.' . $extTable[$mime] : '';
            // Set name if name eq 'image.png' and $args has 'name' array, e.g. clipboard data
            if (is_array($args['name']) && isset($args['name'][0])) {
                $name = $args['name'][0];
                if ($ext) {
                    $name = preg_replace('/\.[^.]*$/', '', $name);
                }
            } else {
                $name = substr(md5($data), 0, 8);
            }
            $name .= $ext;
        } else {
            $data = $name = '';
        }
        return array($data, $name);
    }

    /**
     * Detect file MIME Type by local path
     *
     * @param  string $path Local path
     *
     * @return string file MIME Type
     * @author Naoki Sawada
     */
    protected function detectMimeType($path)
    {
        static $type, $finfo;
        if (!$type) {
            if (class_exists('finfo', false)) {
                $tmpFileInfo = explode(';', finfo_file(finfo_open(FILEINFO_MIME), __FILE__));
            } else {
                $tmpFileInfo = false;
            }
            $regexp = '/text\/x\-(php|c\+\+)/';
            if ($tmpFileInfo && preg_match($regexp, array_shift($tmpFileInfo))) {
                $type = 'finfo';
                $finfo = finfo_open(FILEINFO_MIME);
            } elseif (function_exists('mime_content_type')
                && ($_ctypes = explode(';', mime_content_type(__FILE__)))
                && preg_match($regexp, array_shift($_ctypes))) {
                $type = 'mime_content_type';
            } elseif (function_exists('getimagesize')) {
                $type = 'getimagesize';
            } else {
                $type = 'none';
            }
        }

        $mime = '';
        if ($type === 'finfo') {
            $mime = finfo_file($finfo, $path);
        } elseif ($type === 'mime_content_type') {
            $mime = mime_content_type($path);
        } elseif ($type === 'getimagesize') {
            if ($img = getimagesize($path)) {
                $mime = $img['mime'];
            }
        }

        if ($mime) {
            $mime = explode(';', $mime);
            $mime = trim($mime[0]);

            if (in_array($mime, array('application/x-empty', 'inode/x-empty'))) {
                // finfo return this mime for empty files
                $mime = 'text/plain';
            } elseif ($mime == 'application/x-zip') {
                // http://elrte.org/redmine/issues/163
                $mime = 'application/zip';
            }
        }

        return $mime ? $mime : 'unknown';
    }

    /**
     * Detect file type extension by local path
     *
     * @param  object $volume elFinderVolumeDriver instance
     * @param  string $path   Local path
     * @param  string $name   Filename to save
     *
     * @return string file type extension with dot
     * @author Naoki Sawada
     */
    protected function detectFileExtension($volume, $path, $name)
    {
        $mime = $this->detectMimeType($path);
        if ($mime === 'unknown') {
            $mime = 'application/octet-stream';
        }
        $ext = $volume->getExtentionByMime($volume->mimeTypeNormalize($mime, $name));
        return $ext ? ('.' . $ext) : '';
    }

    /**
     * Get temporary directory path
     *
     * @param  string $volumeTempPath
     *
     * @return string
     * @author Naoki Sawada
     */
    private function getTempDir($volumeTempPath = null)
    {
        $testDirs = array();
        if ($this->uploadTempPath) {
            $testDirs[] = rtrim(realpath($this->uploadTempPath), DIRECTORY_SEPARATOR);
        }
        if ($volumeTempPath) {
            $testDirs[] = rtrim(realpath($volumeTempPath), DIRECTORY_SEPARATOR);
        }
        if (elFinder::$commonTempPath) {
            $testDirs[] = elFinder::$commonTempPath;
        }
        $tempDir = '';
        foreach ($testDirs as $testDir) {
            if (!$testDir || !is_dir($testDir)) continue;
            if (is_writable($testDir)) {
                $tempDir = $testDir;
                $gc = time() - 3600;
                foreach (glob($tempDir . DIRECTORY_SEPARATOR . 'ELF*') as $cf) {
                    if (filemtime($cf) < $gc) {
                        unlink($cf);
                    }
                }
                break;
            }
        }
        return $tempDir;
    }

    /**
     * chmod
     *
     * @param array  command arguments
     *
     * @return array
     * @throws elFinderAbortException
     * @author David Bartle
     */
    protected function chmod($args)
    {
        $targets = $args['targets'];
        $mode = intval((string)$args['mode'], 8);

        if (!is_array($targets)) {
            $targets = array($targets);
        }

        $result = array();

        if (($volume = $this->volume($targets[0])) == false) {
            $result['error'] = $this->error(self::ERROR_CONF_NO_VOL);
            return $result;
        }

        $this->itemLock($targets);

        $files = array();
        $errors = array();
        foreach ($targets as $target) {
            elFinder::checkAborted();

            $file = $volume->chmod($target, $mode);
            if ($file) {
                $files = array_merge($files, is_array($file) ? $file : array($file));
            } else {
                $errors = array_merge($errors, $volume->error());
            }
        }

        if ($files) {
            $result['changed'] = $files;
            if ($errors) {
                $result['warning'] = $this->error($errors);
            }
        } else {
            $result['error'] = $this->error($errors);
        }

        return $result;
    }

    /**
     * Check chunked upload files
     *
     * @param string $tmpname uploaded temporary file path
     * @param string $chunk   uploaded chunk file name
     * @param string $cid     uploaded chunked file id
     * @param string $tempDir temporary dirctroy path
     * @param null   $volume
     *
     * @return array|null
     * @throws elFinderAbortException
     * @author Naoki Sawada
     */
    private function checkChunkedFile($tmpname, $chunk, $cid, $tempDir, $volume = null)
    {
        /* @var elFinderVolumeDriver $volume */
        if (preg_match('/^(.+)(\.\d+_(\d+))\.part$/s', $chunk, $m)) {
            $fname = $m[1];
            $encname = md5($cid . '_' . $fname);
            $base = $tempDir . DIRECTORY_SEPARATOR . 'ELF' . $encname;
            $clast = intval($m[3]);
            if (is_null($tmpname)) {
                ignore_user_abort(true);
                // chunked file upload fail
                foreach (glob($base . '*') as $cf) {
                    unlink($cf);
                }
                ignore_user_abort(false);
                return null;
            }

            $range = isset($_POST['range']) ? trim($_POST['range']) : '';
            if ($range && preg_match('/^(\d+),(\d+),(\d+)$/', $range, $ranges)) {
                $start = $ranges[1];
                $len = $ranges[2];
                $size = $ranges[3];
                $tmp = $base . '.part';
                $csize = filesize($tmpname);

                $tmpExists = is_file($tmp);
                if (!$tmpExists) {
                    // check upload max size
                    $uploadMaxSize = $volume ? $volume->getUploadMaxSize() : 0;
                    if ($uploadMaxSize > 0 && $size > $uploadMaxSize) {
                        return array(self::ERROR_UPLOAD_FILE_SIZE, false);
                    }
                    // make temp file
                    $ok = false;
                    if ($fp = fopen($tmp, 'wb')) {
                        flock($fp, LOCK_EX);
                        $ok = ftruncate($fp, $size);
                        flock($fp, LOCK_UN);
                        fclose($fp);
                        touch($base);
                    }
                    if (!$ok) {
                        unlink($tmp);
                        return array(self::ERROR_UPLOAD_TEMP, false);
                    }
                } else {
                    // wait until makeing temp file (for anothor session)
                    $cnt = 1200; // Time limit 120 sec
                    while (!is_file($base) && --$cnt) {
                        usleep(100000); // wait 100ms
                    }
                    if (!$cnt) {
                        return array(self::ERROR_UPLOAD_TEMP, false);
                    }
                }

                // check size info
                if ($len != $csize || $start + $len > $size || ($tmpExists && $size != filesize($tmp))) {
                    return array(self::ERROR_UPLOAD_TEMP, false);
                }

                // write chunk data
                $src = fopen($tmpname, 'rb');
                $fp = fopen($tmp, 'cb');
                fseek($fp, $start);
                $writelen = stream_copy_to_stream($src, $fp, $len);
                fclose($fp);
                fclose($src);

                try {
                    // to check connection is aborted
                    elFinder::checkAborted();
                } catch (elFinderAbortException $e) {
                    unlink($tmpname);
                    is_file($tmp) && unlink($tmp);
                    is_file($base) && unlink($base);
                    throw $e;
                }

                if ($writelen != $len) {
                    return array(self::ERROR_UPLOAD_TEMP, false);
                }

                // write counts
                file_put_contents($base, "\0", FILE_APPEND | LOCK_EX);

                if (filesize($base) >= $clast + 1) {
                    // Completion
                    unlink($base);
                    return array($tmp, $fname);
                }
            } else {
                // old way
                $part = $base . $m[2];
                if (move_uploaded_file($tmpname, $part)) {
                    chmod($part, 0600);
                    if ($clast < count(glob($base . '*'))) {
                        $parts = array();
                        for ($i = 0; $i <= $clast; $i++) {
                            $name = $base . '.' . $i . '_' . $clast;
                            if (is_readable($name)) {
                                $parts[] = $name;
                            } else {
                                $parts = null;
                                break;
                            }
                        }
                        if ($parts) {
                            if (!is_file($base)) {
                                touch($base);
                                if ($resfile = tempnam($tempDir, 'ELF')) {
                                    $target = fopen($resfile, 'wb');
                                    foreach ($parts as $f) {
                                        $fp = fopen($f, 'rb');
                                        while (!feof($fp)) {
                                            fwrite($target, fread($fp, 8192));
                                        }
                                        fclose($fp);
                                        unlink($f);
                                    }
                                    fclose($target);
                                    unlink($base);
                                    return array($resfile, $fname);
                                }
                                unlink($base);
                            }
                        }
                    }
                }
            }
        }
        return array('', '');
    }

    /**
     * Save uploaded files
     *
     * @param  array
     *
     * @return array
     * @throws elFinderAbortException
     * @author Dmitry (dio) Levashov
     */
    protected function upload($args)
    {
        $ngReg = '/[\/\\?*:|"<>]/';
        $target = $args['target'];
        $volume = $this->volume($target);
        $files = isset($args['FILES']['upload']) && is_array($args['FILES']['upload']) ? $args['FILES']['upload'] : array();
        $header = empty($args['html']) ? array() : array('header' => 'Content-Type: text/html; charset=utf-8');
        $result = array_merge(array('added' => array()), $header);
        $paths = $args['upload_path'] ? $args['upload_path'] : array();
        $chunk = $args['chunk'] ? $args['chunk'] : '';
        $cid = $args['cid'] ? (int)$args['cid'] : '';
        $mtimes = $args['mtime'] ? $args['mtime'] : array();
        $tmpfname = '';

        if (!$volume) {
            return array_merge(array('error' => $this->error(self::ERROR_UPLOAD, self::ERROR_TRGDIR_NOT_FOUND, '#' . $target)), $header);
        }

        // check $chunk
        if (strpos($chunk, '/') !== false || strpos($chunk, '\\') !== false) {
            return array('error' => $this->error(self::ERROR_UPLOAD));
        }

        if ($args['overwrite'] !== '') {
            $volume->setUploadOverwrite($args['overwrite']);
        }

        $renames = $hashes = array();
        $suffix = '~';
        if ($args['renames'] && is_array($args['renames'])) {
            $renames = array_flip($args['renames']);
            if (is_string($args['suffix']) && !preg_match($ngReg, $args['suffix'])) {
                $suffix = $args['suffix'];
            }
        }
        if ($args['hashes'] && is_array($args['hashes'])) {
            $hashes = array_flip($args['hashes']);
        }

        $this->itemLock($target);

        // file extentions table by MIME
        $extTable = array_flip(array_unique($volume->getMimeTable()));

        if (empty($files)) {
            if (isset($args['upload']) && is_array($args['upload']) && ($tempDir = $this->getTempDir($volume->getTempPath()))) {
                $names = array();
                foreach ($args['upload'] as $i => $url) {
                    // check chunked file upload commit
                    if ($chunk) {
                        if ($url === 'chunkfail' && $args['mimes'] === 'chunkfail') {
                            $this->checkChunkedFile(null, $chunk, $cid, $tempDir);
                            if (preg_match('/^(.+)(\.\d+_(\d+))\.part$/s', $chunk, $m)) {
                                $result['warning'] = $this->error(self::ERROR_UPLOAD_FILE, $m[1], self::ERROR_UPLOAD_TEMP);
                            }
                            return $result;
                        } else {
                            $tmpfname = $tempDir . '/' . $chunk;
                            $files['tmp_name'][$i] = $tmpfname;
                            $files['name'][$i] = $url;
                            $files['error'][$i] = 0;
                            $GLOBALS['elFinderTempFiles'][$tmpfname] = true;
                            break;
                        }
                    }

                    $tmpfname = $tempDir . DIRECTORY_SEPARATOR . 'ELF_FATCH_' . md5($url . microtime(true));
                    $GLOBALS['elFinderTempFiles'][$tmpfname] = true;

                    $_name = '';
                    // check is data:
                    if (substr($url, 0, 5) === 'data:') {
                        list($data, $args['name'][$i]) = $this->parse_data_scheme($url, $extTable, $args);
                    } else {
                        $fp = fopen($tmpfname, 'wb');
                        if ($data = $this->get_remote_contents($url, 30, 5, 'Mozilla/5.0', $fp)) {
                            // to check connection is aborted
                            try {
                                elFinder::checkAborted();
                            } catch(elFinderAbortException $e) {
                                fclose($fp);
                                throw $e;
                            }
                            if (strpos($url, '%') !== false) {
                                $url = rawurldecode($url);
                            }
                            if (is_callable('mb_convert_encoding') && is_callable('mb_detect_encoding')) {
                                $url = mb_convert_encoding($url, 'UTF-8', mb_detect_encoding($url));
                            }
                            $url = iconv('UTF-8', 'UTF-8//IGNORE', $url);
                            $_name = preg_replace('~^.*?([^/#?]+)(?:\?.*)?(?:#.*)?$~', '$1', $url);
                            // Check `Content-Disposition` response header
                            if (($headers = get_headers($url, true)) && !empty($headers['Content-Disposition'])) {
                                if (preg_match('/filename\*=(?:([a-zA-Z0-9_-]+?)\'\')"?([a-z0-9_.~%-]+)"?/i', $headers['Content-Disposition'], $m)) {
                                    $_name = rawurldecode($m[2]);
                                    if ($m[1] && strtoupper($m[1]) !== 'UTF-8' && function_exists('mb_convert_encoding')) {
                                        $_name = mb_convert_encoding($_name, 'UTF-8', $m[1]);
                                    }
                                } else if (preg_match('/filename="?([ a-z0-9_.~%-]+)"?/i', $headers['Content-Disposition'], $m)) {
                                    $_name = rawurldecode($m[1]);
                                }
                            }
                        } else {
                            fclose($fp);
                        }
                    }
                    if ($data) {
                        if (isset($args['name'][$i])) {
                            $_name = $args['name'][$i];
                        }
                        if ($_name) {
                            $_ext = '';
                            if (preg_match('/(\.[a-z0-9]{1,7})$/', $_name, $_match)) {
                                $_ext = $_match[1];
                            }
                            if ((is_resource($data) && fclose($data)) || file_put_contents($tmpfname, $data)) {
                                $GLOBALS['elFinderTempFiles'][$tmpfname] = true;
                                $_name = preg_replace($ngReg, '_', $_name);
                                list($_a, $_b) = array_pad(explode('.', $_name, 2), 2, '');
                                if ($_b === '') {
                                    if ($_ext) {
                                        rename($tmpfname, $tmpfname . $_ext);
                                        $tmpfname = $tmpfname . $_ext;
                                    }
                                    $_b = $this->detectFileExtension($volume, $tmpfname, $_name);
                                    $_name = $_a . $_b;
                                } else {
                                    $_b = '.' . $_b;
                                }
                                if (isset($names[$_name])) {
                                    $_name = $_a . '_' . $names[$_name]++ . $_b;
                                } else {
                                    $names[$_name] = 1;
                                }
                                $files['tmp_name'][$i] = $tmpfname;
                                $files['name'][$i] = $_name;
                                $files['error'][$i] = 0;
                                // set to auto rename
                                $volume->setUploadOverwrite(false);
                            } else {
                                unlink($tmpfname);
                            }
                        }
                    }
                }
            }
            if (empty($files)) {
                return array_merge(array('error' => $this->error(self::ERROR_UPLOAD, self::ERROR_UPLOAD_NO_FILES)), $header);
            }
        }

        $addedDirs = array();
        $errors = array();
        foreach ($files['name'] as $i => $name) {
            if (($error = $files['error'][$i]) > 0) {
                $result['warning'] = $this->error(self::ERROR_UPLOAD_FILE, $name, $error == UPLOAD_ERR_INI_SIZE || $error == UPLOAD_ERR_FORM_SIZE ? self::ERROR_UPLOAD_FILE_SIZE : self::ERROR_UPLOAD_TRANSFER, $error);
                $this->uploadDebug = 'Upload error code: ' . $error;
                break;
            }

            $tmpname = $files['tmp_name'][$i];
            $thash = ($paths && isset($paths[$i])) ? $paths[$i] : $target;
            $mtime = isset($mtimes[$i]) ? $mtimes[$i] : 0;
            if ($name === 'blob') {
                if ($chunk) {
                    if ($tempDir = $this->getTempDir($volume->getTempPath())) {
                        list($tmpname, $name) = $this->checkChunkedFile($tmpname, $chunk, $cid, $tempDir, $volume);
                        if ($tmpname) {
                            if ($name === false) {
                                preg_match('/^(.+)(\.\d+_(\d+))\.part$/s', $chunk, $m);
                                $result['error'] = $this->error(self::ERROR_UPLOAD_FILE, $m[1], $tmpname);
                                $result['_chunkfailure'] = true;
                                $this->uploadDebug = 'Upload error: ' . $tmpname;
                            } else if ($name) {
                                $result['_chunkmerged'] = basename($tmpname);
                                $result['_name'] = $name;
                                $result['_mtime'] = $mtime;
                            }
                        }
                    } else {
                        $result['error'] = $this->error(self::ERROR_UPLOAD_FILE, $chunk, self::ERROR_UPLOAD_TEMP);
                        $this->uploadDebug = 'Upload error: unable open tmp file';
                    }
                    return $result;
                } else {
                    // for form clipboard with Google Chrome or Opera
                    $name = 'image.png';
                }
            }

            // Set name if name eq 'image.png' and $args has 'name' array, e.g. clipboard data
            if (strtolower(substr($name, 0, 5)) === 'image' && is_array($args['name']) && isset($args['name'][$i])) {
                $type = $files['type'][$i];
                $name = $args['name'][$i];
                $ext = isset($extTable[$type]) ? '.' . $extTable[$type] : '';
                if ($ext) {
                    $name = preg_replace('/\.[^.]*$/', '', $name);
                }
                $name .= $ext;
            }

            // do hook function 'upload.presave'
            try {
                $this->trigger('upload.presave', array(&$thash, &$name, $tmpname, $this, $volume), $errors);
            } catch (elFinderTriggerException $e) {
                if (!is_uploaded_file($tmpname) && unlink($tmpname) && $tmpfname) {
                    unset($GLOBALS['elFinderTempFiles'][$tmpfname]);
                }
                continue;
            }

            clearstatcache();
            if ($mtime && is_file($tmpname)) {
                // for keep timestamp option in the LocalFileSystem volume
                touch($tmpname, $mtime);
            }

            $fp = null;
            if (!is_file($tmpname) || ($fp = fopen($tmpname, 'rb')) === false) {
                $errors = array_merge($errors, array(self::ERROR_UPLOAD_FILE, $name, ($fp === false? self::ERROR_UPLOAD_TEMP : self::ERROR_UPLOAD_TRANSFER)));
                $this->uploadDebug = 'Upload error: unable open tmp file';
                if (!is_uploaded_file($tmpname)) {
                    if (unlink($tmpname) && $tmpfname) unset($GLOBALS['elFinderTempFiles'][$tmpfname]);
                    continue;
                }
                break;
            }
            $rnres = array();
            if ($thash !== '' && $thash !== $target) {
                if ($dir = $volume->dir($thash)) {
                    $_target = $thash;
                    if (!isset($addedDirs[$thash])) {
                        $addedDirs[$thash] = true;
                        $result['added'][] = $dir;
                        // to support multi-level directory creation
                        $_phash = isset($dir['phash']) ? $dir['phash'] : null;
                        while ($_phash && !isset($addedDirs[$_phash]) && $_phash !== $target) {
                            if ($_dir = $volume->dir($_phash)) {
                                $addedDirs[$_phash] = true;
                                $result['added'][] = $_dir;
                                $_phash = isset($_dir['phash']) ? $_dir['phash'] : null;
                            } else {
                                break;
                            }
                        }
                    }
                } else {
                    $result['error'] = $this->error(self::ERROR_UPLOAD, self::ERROR_TRGDIR_NOT_FOUND, 'hash@' . $thash);
                    break;
                }
            } else {
                $_target = $target;
                // file rename for backup
                if (isset($renames[$name])) {
                    $dir = $volume->realpath($_target);
                    if (isset($hashes[$name])) {
                        $hash = $hashes[$name];
                    } else {
                        $hash = $volume->getHash($dir, $name);
                    }
                    $rnres = $this->rename(array('target' => $hash, 'name' => $volume->uniqueName($dir, $name, $suffix, true, 0)));
                    if (!empty($rnres['error'])) {
                        $result['warning'] = $rnres['error'];
                        if (!is_array($rnres['error'])) {
                            $errors = array_push($errors, $rnres['error']);
                        } else {
                            $errors = array_merge($errors, $rnres['error']);
                        }
                        continue;
                    }
                }
            }
            if (!$_target || ($file = $volume->upload($fp, $_target, $name, $tmpname, ($_target === $target) ? $hashes : array())) === false) {
                $errors = array_merge($errors, $this->error(self::ERROR_UPLOAD_FILE, $name, $volume->error()));
                fclose($fp);
                if (!is_uploaded_file($tmpname) && unlink($tmpname)) {
                    unset($GLOBALS['elFinderTempFiles'][$tmpname]);
                }
                continue;
            }

            is_resource($fp) && fclose($fp);
            if (!is_uploaded_file($tmpname)) {
                clearstatcache();
                if (!is_file($tmpname) || unlink($tmpname)) {
                    unset($GLOBALS['elFinderTempFiles'][$tmpname]);
                }
            }
            $result['added'][] = $file;
            if ($rnres) {
                $result = array_merge_recursive($result, $rnres);
            }
        }

        if ($errors) {
            $result['warning'] = $errors;
        }

        if ($GLOBALS['elFinderTempFiles']) {
            foreach (array_keys($GLOBALS['elFinderTempFiles']) as $_temp) {
                is_file($_temp) && is_writable($_temp) && unlink($_temp);
            }
        }
        $result['removed'] = $volume->removed();

        if (!empty($args['node'])) {
            $result['callback'] = array(
                'node' => $args['node'],
                'bind' => 'upload'
            );
        }
        return $result;
    }

    /**
     * Copy/move files into new destination
     *
     * @param  array  command arguments
     *
     * @return array
     * @throws elFinderAbortException
     * @author Dmitry (dio) Levashov
     */
    protected function paste($args)
    {
        $dst = $args['dst'];
        $targets = is_array($args['targets']) ? $args['targets'] : array();
        $cut = !empty($args['cut']);
        $error = $cut ? self::ERROR_MOVE : self::ERROR_COPY;
        $result = array('changed' => array(), 'added' => array(), 'removed' => array(), 'warning' => array());

        if (($dstVolume = $this->volume($dst)) == false) {
            return array('error' => $this->error($error, '#' . $targets[0], self::ERROR_TRGDIR_NOT_FOUND, '#' . $dst));
        }

        $this->itemLock($dst);

        $hashes = $renames = array();
        $suffix = '~';
        if (!empty($args['renames'])) {
            $renames = array_flip($args['renames']);
            if (is_string($args['suffix']) && !preg_match('/[\/\\?*:|"<>]/', $args['suffix'])) {
                $suffix = $args['suffix'];
            }
        }
        if (!empty($args['hashes'])) {
            $hashes = array_flip($args['hashes']);
        }

        foreach ($targets as $target) {
            elFinder::checkAborted();

            if (($srcVolume = $this->volume($target)) == false) {
                $result['warning'] = array_merge($result['warning'], $this->error($error, '#' . $target, self::ERROR_FILE_NOT_FOUND));
                continue;
            }

            $rnres = array();
            if ($renames) {
                $file = $srcVolume->file($target);
                if (isset($renames[$file['name']])) {
                    $dir = $dstVolume->realpath($dst);
                    $dstName = $file['name'];
                    if ($srcVolume !== $dstVolume) {
                        $errors = array();
                        try {
                            $this->trigger('paste.copyfrom', array(&$dst, &$dstName, '', $this, $dstVolume), $errors);
                        } catch (elFinderTriggerException $e) {
                            $result['warning'] = array_merge($result['warning'], $errors);
                            continue;
                        }
                    }
                    if (isset($hashes[$file['name']])) {
                        $hash = $hashes[$file['name']];
                    } else {
                        $hash = $dstVolume->getHash($dir, $dstName);
                    }
                    $rnres = $this->rename(array('target' => $hash, 'name' => $dstVolume->uniqueName($dir, $dstName, $suffix, true, 0)));
                    if (!empty($rnres['error'])) {
                        $result['warning'] = array_merge($result['warning'], $rnres['error']);
                        continue;
                    }
                }
            }

            if ($cut && $this->itemLocked($target)) {
                $rm = $srcVolume->file($target);
                $result['warning'] = array_merge($result['warning'], $this->error(self::ERROR_LOCKED, $rm['name']));
                continue;
            }

            if (($file = $dstVolume->paste($srcVolume, $target, $dst, $cut, $hashes)) == false) {
                $result['warning'] = array_merge($result['warning'], $this->error($dstVolume->error()));
                continue;
            }

            if ($error = $dstVolume->error()) {
                $result['warning'] = array_merge($result['warning'], $this->error($error));
            }

            if ($rnres) {
                $result = array_merge_recursive($result, $rnres);
            }
        }
        if (count($result['warning']) < 1) {
            unset($result['warning']);
        } else {
            $result['sync'] = true;
        }

        return $result;
    }

    /**
     * Return file content
     *
     * @param  array $args command arguments
     *
     * @return array
     * @author Dmitry (dio) Levashov
     **/
    protected function get($args)
    {
        $target = $args['target'];
        $volume = $this->volume($target);
        $enc = false;

        if (!$volume || ($file = $volume->file($target)) == false) {
            return array('error' => $this->error(self::ERROR_OPEN, '#' . $target, self::ERROR_FILE_NOT_FOUND));
        }

        if ($volume->commandDisabled('get')) {
            return array('error' => $this->error(self::ERROR_OPEN, '#' . $target, self::ERROR_ACCESS_DENIED));
        }

        if (($content = $volume->getContents($target)) === false) {
            return array('error' => $this->error(self::ERROR_OPEN, $volume->path($target), $volume->error()));
        }

        $mime = isset($file['mime']) ? $file['mime'] : '';
        if ($mime && (strtolower(substr($mime, 0, 4)) === 'text' || in_array(strtolower($mime), self::$textMimes))) {
            $enc = '';
            if ($content !== '') {
                if (!$args['conv'] || $args['conv'] == '1') {
                    // detect encoding
                    if (function_exists('mb_detect_encoding')) {
                        if ($enc = mb_detect_encoding($content, mb_detect_order(), true)) {
                            $encu = strtoupper($enc);
                            if ($encu === 'UTF-8' || $encu === 'ASCII') {
                                $enc = '';
                            }
                        } else {
                            $enc = 'unknown';
                        }
                    } else if (!preg_match('//u', $content)) {
                        $enc = 'unknown';
                    }
                    if ($enc === 'unknown') {
                        $enc = $volume->getOption('encoding');
                        if (!$enc || strtoupper($enc) === 'UTF-8') {
                            $enc = 'unknown';
                        }
                    }
                    // call callbacks 'get.detectencoding'
                    if (!empty($this->listeners['get.detectencoding'])) {
                        foreach ($this->listeners['get.detectencoding'] as $handler) {
                            call_user_func_array($handler, array('get', &$enc, array_merge($args, array('content' => $content)), $this, $volume));
                        }
                    }
                    if ($enc && $enc !== 'unknown') {
                        $errlev = error_reporting();
                        error_reporting($errlev ^ E_NOTICE);
                        $utf8 = iconv($enc, 'UTF-8', $content);
                        if ($utf8 === false && function_exists('mb_convert_encoding')) {
                            error_reporting($errlev ^ E_WARNING);
                            $utf8 = mb_convert_encoding($content, 'UTF-8', $enc);
                            if (mb_convert_encoding($utf8, $enc, 'UTF-8') !== $content) {
                                $enc = 'unknown';
                            }
                        } else {
                            if ($utf8 === false || iconv('UTF-8', $enc, $utf8) !== $content) {
                                $enc = 'unknown';
                            }
                        }
                        error_reporting($errlev);
                        if ($enc !== 'unknown') {
                            $content = $utf8;
                        }
                    }
                    if ($enc) {
                        if ($args['conv'] == '1') {
                            $args['conv'] = '';
                            if ($enc === 'unknown') {
                                $content = false;
                            }
                        } else if ($enc === 'unknown') {
                            return array('doconv' => $enc);
                        }
                    }
                    if ($args['conv'] == '1') {
                        $args['conv'] = '';
                    }
                }
                if ($args['conv']) {
                    $enc = $args['conv'];
                    if (strtoupper($enc) !== 'UTF-8') {
                        $_content = $content;
                        $errlev = error_reporting();
                        $this->setToastErrorHandler(array(
                            'prefix' => 'Notice: '
                        ));
                        error_reporting($errlev | E_NOTICE | E_WARNING);
                        $content = iconv($enc, 'UTF-8//TRANSLIT', $content);
                        if ($content === false && function_exists('mb_convert_encoding')) {
                            $content = mb_convert_encoding($_content, 'UTF-8', $enc);
                        }
                        error_reporting($errlev);
                        $this->setToastErrorHandler(false);
                    } else {
                        $enc = '';
                    }
                }
            }
        } else {
            $content = 'data:' . ($mime ? $mime : 'application/octet-stream') . ';base64,' . base64_encode($content);
        }

        if ($enc !== false) {
            $json = false;
            if ($content !== false) {
                $json = json_encode($content);
            }
            if ($content === false || $json === false || strlen($json) < strlen($content)) {
                return array('doconv' => 'unknown');
            }
        }

        $res = array(
            'header' => array(
                'Content-Type: application/json'
            ),
            'content' => $content
        );

        // add cache control headers
        if ($cacheHeaders = $volume->getOption('cacheHeaders')) {
            $res['header'] = array_merge($res['header'], $cacheHeaders);
        }

        if ($enc) {
            $res['encoding'] = $enc;
        }
        return $res;
    }

    /**
     * Save content into text file
     *
     * @param $args
     *
     * @return array
     * @author Dmitry (dio) Levashov
     */
    protected function put($args)
    {
        $target = $args['target'];
        $encoding = isset($args['encoding']) ? $args['encoding'] : '';

        if (($volume = $this->volume($target)) == false
            || ($file = $volume->file($target)) == false) {
            return array('error' => $this->error(self::ERROR_SAVE, '#' . $target, self::ERROR_FILE_NOT_FOUND));
        }

        $this->itemLock($target);

        if ($encoding === 'scheme') {
            if (preg_match('~^https?://~i', $args['content'])) {
                /** @var resource $fp */
                $fp = $this->get_remote_contents($args['content'], 30, 5, 'Mozilla/5.0', $volume->tmpfile());
                if (!$fp) {
                    return array('error' => self::ERROR_SAVE, $args['content'], self::ERROR_FILE_NOT_FOUND);
                }
                $fmeta = stream_get_meta_data($fp);
                $mime = $this->detectMimeType($fmeta['uri']);
                if ($mime === 'unknown') {
                    $mime = 'application/octet-stream';
                }
                $mime = $volume->mimeTypeNormalize($mime, $file['name']);
                $args['content'] = 'data:' . $mime . ';base64,' . base64_encode(file_get_contents($fmeta['uri']));
            }
            $encoding = '';
            $args['content'] = "\0" . $args['content'];
        } else if ($encoding === 'hash') {
            $_hash = $args['content'];
            if ($_src = $this->getVolume($_hash)) {
                if ($_file = $_src->file($_hash)) {
                    if ($_data = $_src->getContents($_hash)) {
                        $args['content'] = 'data:' . $file['mime'] . ';base64,' . base64_encode($_data);
                    }
                }
            }
            $encoding = '';
            $args['content'] = "\0" . $args['content'];
        }
        if ($encoding) {
            $content = iconv('UTF-8', $encoding, $args['content']);
            if ($content === false && function_exists('mb_detect_encoding')) {
                $content = mb_convert_encoding($args['content'], $encoding, 'UTF-8');
            }
            if ($content !== false) {
                $args['content'] = $content;
            }
        }
        if (($file = $volume->putContents($target, $args['content'])) == false) {
            return array('error' => $this->error(self::ERROR_SAVE, $volume->path($target), $volume->error()));
        }

        return array('changed' => array($file));
    }

    /**
     * Extract files from archive
     *
     * @param  array $args command arguments
     *
     * @return array
     * @author Dmitry (dio) Levashov,
     * @author Alexey Sukhotin
     **/
    protected function extract($args)
    {
        $target = $args['target'];
        $makedir = isset($args['makedir']) ? (bool)$args['makedir'] : null;

        if(strpos($target,'..') !== false){
            return array('error' => $this->error(self::ERROR_EXTRACT, '#' . $target, self::ERROR_FILE_NOT_FOUND));
        }

        if (($volume = $this->volume($target)) == false
            || ($file = $volume->file($target)) == false) {
            return array('error' => $this->error(self::ERROR_EXTRACT, '#' . $target, self::ERROR_FILE_NOT_FOUND));
        }

        $res = array();
        if ($file = $volume->extract($target, $makedir)) {
            $res['added'] = isset($file['read']) ? array($file) : $file;
            if ($err = $volume->error()) {
                $res['warning'] = $err;
            }
        } else {
            $res['error'] = $this->error(self::ERROR_EXTRACT, $volume->path($target), $volume->error());
        }
        return $res;
    }

    /**
     * Create archive
     *
     * @param  array $args command arguments
     *
     * @return array
     * @throws Exception
     * @author Dmitry (dio) Levashov,
     * @author Alexey Sukhotin
     */
    protected function archive($args)
    {
        $targets = isset($args['targets']) && is_array($args['targets']) ? $args['targets'] : array();
        $name = isset($args['name']) ? $args['name'] : '';

        if(strpos($name,'..') !== false){
            return $this->error('Invalid Request.', self::ERROR_TRGDIR_NOT_FOUND);
        }

        $targets = array_filter($targets, array($this, 'volume'));
        if (!$targets || ($volume = $this->volume($targets[0])) === false) {
            return $this->error(self::ERROR_ARCHIVE, self::ERROR_TRGDIR_NOT_FOUND);
        }

        foreach ($targets as $target) {
            $explodedStr = explode('l1_', $target);
            $targetFolderName = base64_decode($explodedStr[1]);
            if(strpos($targetFolderName,'..') !== false){
                return $this->error('Invalid Request.', self::ERROR_TRGDIR_NOT_FOUND);
            }
            $this->itemLock($target);
        }

        return ($file = $volume->archive($targets, $args['type'], $name))
            ? array('added' => array($file))
            : array('error' => $this->error(self::ERROR_ARCHIVE, $volume->error()));
    }

    /**
     * Search files
     *
     * @param  array $args command arguments
     *
     * @return array
     * @throws elFinderAbortException
     * @author Dmitry Levashov
     */
    protected function search($args)
    {
        $q = trim($args['q']);
        $mimes = !empty($args['mimes']) && is_array($args['mimes']) ? $args['mimes'] : array();
        $target = !empty($args['target']) ? $args['target'] : null;
        $type = !empty($args['type']) ? $args['type'] : null;
        $result = array();
        $errors = array();

        if ($target) {
            if ($volume = $this->volume($target)) {
                $result = $volume->search($q, $mimes, $target, $type);
                $errors = array_merge($errors, $volume->error());
            }
        } else {
            foreach ($this->volumes as $volume) {
                $result = array_merge($result, $volume->search($q, $mimes, null, $type));
                $errors = array_merge($errors, $volume->error());
            }
        }

        $result = array('files' => $result);
        if ($errors) {
            $result['warning'] = $errors;
        }
        return $result;
    }

    /**
     * Return file info (used by client "places" ui)
     *
     * @param  array $args command arguments
     *
     * @return array
     * @throws elFinderAbortException
     * @author Dmitry Levashov
     */
    protected function info($args)
    {
        $files = array();
        $compare = null;
        // long polling mode
        if ($args['compare'] && count($args['targets']) === 1) {
            $compare = intval($args['compare']);
            $hash = $args['targets'][0];
            if ($volume = $this->volume($hash)) {
                $standby = (int)$volume->getOption('plStandby');
                $_compare = false;
                if (($syncCheckFunc = $volume->getOption('syncCheckFunc')) && is_callable($syncCheckFunc)) {
                    $_compare = call_user_func_array($syncCheckFunc, array($volume->realpath($hash), $standby, $compare, $volume, $this));
                }
                if ($_compare !== false) {
                    $compare = $_compare;
                } else {
                    $sleep = max(1, (int)$volume->getOption('tsPlSleep'));
                    $limit = max(1, $standby / $sleep) + 1;
                    do {
                        elFinder::extendTimeLimit(30 + $sleep);
                        $volume->clearstatcache();
                        if (($info = $volume->file($hash)) != false) {
                            if ($info['ts'] != $compare) {
                                $compare = $info['ts'];
                                break;
                            }
                        } else {
                            $compare = 0;
                            break;
                        }
                        if (--$limit) {
                            sleep($sleep);
                        }
                    } while ($limit);
                }
            }
        } else {
            foreach ($args['targets'] as $hash) {
                elFinder::checkAborted();
                if (($volume = $this->volume($hash)) != false
                    && ($info = $volume->file($hash)) != false) {
                    $info['path'] = $volume->path($hash);
                    $files[] = $info;
                }
            }
        }

        $result = array('files' => $files);
        if (!is_null($compare)) {
            $result['compare'] = strval($compare);
        }
        return $result;
    }

    /**
     * Return image dimensions
     *
     * @param  array $args command arguments
     *
     * @return array
     * @throws ImagickException
     * @throws elFinderAbortException
     * @author Dmitry (dio) Levashov
     */
    protected function dim($args)
    {
        $res = array();
        $target = $args['target'];

        if (($volume = $this->volume($target)) != false) {
            if ($dim = $volume->dimensions($target, $args)) {
                if (is_array($dim) && isset($dim['dim'])) {
                    $res = $dim;
                } else {
                    $res = array('dim' => $dim);
                    if ($subImgLink = $volume->getSubstituteImgLink($target, explode('x', $dim))) {
                        $res['url'] = $subImgLink;
                    }
                }
            }
        }

        return $res;
    }

    /**
     * Resize image
     *
     * @param  array  command arguments
     *
     * @return array
     * @throws ImagickException
     * @throws elFinderAbortException
     * @author Dmitry (dio) Levashov
     * @author Alexey Sukhotin
     */
    protected function resize($args)
    {
        $target = $args['target'];
        $width = (int)$args['width'];
        $height = (int)$args['height'];
        $x = (int)$args['x'];
        $y = (int)$args['y'];
        $mode = $args['mode'];
        $bg = $args['bg'];
        $degree = (int)$args['degree'];
        $quality = (int)$args['quality'];

        if (($volume = $this->volume($target)) == false
            || ($file = $volume->file($target)) == false) {
            return array('error' => $this->error(self::ERROR_RESIZE, '#' . $target, self::ERROR_FILE_NOT_FOUND));
        }

        if ($mode !== 'rotate' && ($width < 1 || $height < 1)) {
            return array('error' => $this->error(self::ERROR_RESIZESIZE));
        }
        return ($file = $volume->resize($target, $width, $height, $x, $y, $mode, $bg, $degree, $quality))
            ? (!empty($file['losslessRotate']) ? $file : array('changed' => array($file)))
            : array('error' => $this->error(self::ERROR_RESIZE, $volume->path($target), $volume->error()));
    }

    /**
     * Return content URL
     *
     * @param  array $args command arguments
     *
     * @return array
     * @author Naoki Sawada
     **/
    protected function url($args)
    {
        $target = $args['target'];
        $options = isset($args['options']) ? $args['options'] : array();
        if (($volume = $this->volume($target)) != false) {
            if (!$volume->commandDisabled('url')) {
                $url = $volume->getContentUrl($target, $options);
                return $url ? array('url' => $url) : array();
            }
        }
        return array();
    }

    /**
     * Output callback result with JavaScript that control elFinder
     * or HTTP redirect to callbackWindowURL
     *
     * @param  array  command arguments
     *
     * @throws elFinderAbortException
     * @author Naoki Sawada
     */
    protected function callback($args)
    {
        $checkReg = '/[^a-zA-Z0-9;._-]/';
        $node = (isset($args['node']) && !preg_match($checkReg, $args['node'])) ? $args['node'] : '';
        $json = (isset($args['json']) && json_decode($args['json'])) ? $args['json'] : '{}';
        $bind = (isset($args['bind']) && !preg_match($checkReg, $args['bind'])) ? $args['bind'] : '';
        $done = (!empty($args['done']));

        while (ob_get_level()) {
            if (!ob_end_clean()) {
                break;
            }
        }

        if ($done || !$this->callbackWindowURL) {
            $script = '';
            if ($node) {
                if ($bind) {
                    $trigger = 'elf.trigger(\'' . $bind . '\', data);';
                    $triggerdone = 'elf.trigger(\'' . $bind . 'done\');';
                    $triggerfail = 'elf.trigger(\'' . $bind . 'fail\', data);';
                } else {
                    $trigger = $triggerdone = $triggerfail = '';
                }
                $origin = isset($_SERVER['HTTP_ORIGIN'])? str_replace('\'', '\\\'', $_SERVER['HTTP_ORIGIN']) : '*';
                $script .= '
var go = function() {
    var w = window.opener || window.parent || window,
        close = function(){
            window.open("about:blank","_self").close();
            return false;
        };
    try {
        var elf = w.document.getElementById(\'' . $node . '\').elfinder;
        if (elf) {
            var data = ' . $json . ';
            if (data.error) {
                ' . $triggerfail . '
                elf.error(data.error);
            } else {
                data.warning && elf.error(data.warning);
                data.removed && data.removed.length && elf.remove(data);
                data.added   && data.added.length   && elf.add(data);
                data.changed && data.changed.length && elf.change(data);
                ' . $trigger . '
                ' . $triggerdone . '
                data.sync && elf.sync();
            }
        }
    } catch(e) {
        // for CORS
        w.postMessage && w.postMessage(JSON.stringify({bind:\'' . $bind . '\',data:' . $json . '}), \'' . $origin . '\');
    }
    close();
    setTimeout(function() {
        var msg = document.getElementById(\'msg\');
        msg.style.display = \'inline\';
        msg.onclick = close;
    }, 100);
};
';
            }

            $out = '<!DOCTYPE html><html lang="en"><head><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=2"><script>' . $script . '</script></head><body><h2 id="msg" style="display:none;"><a href="#">Please close this tab.</a></h2><script>go();</script></body></html>';

            header('Content-Type: text/html; charset=utf-8');
            header('Content-Length: ' . strlen($out));
            header('Cache-Control: private');
            header('Pragma: no-cache');

            echo $out;

        } else {
            $url = $this->callbackWindowURL;
            $url .= ((strpos($url, '?') === false) ? '?' : '&')
                . '&node=' . rawurlencode($node)
                . (($json !== '{}') ? ('&json=' . rawurlencode($json)) : '')
                . ($bind ? ('&bind=' . rawurlencode($bind)) : '')
                . '&done=1';

            header('Location: ' . $url);

        }
        throw new elFinderAbortException();
    }

    /**
     * Error handler for send toast message to client side
     *
     * @param int    $errno
     * @param string $errstr
     * @param string $errfile
     * @param int    $errline
     *
     * @return boolean
     */
    protected function toastErrorHandler($errno, $errstr, $errfile, $errline)
    {
        $proc = false;
        if (!(error_reporting() & $errno)) {
            return $proc;
        }
        $toast = array();
        $toast['mode'] = $this->toastParams['mode'];
        $toast['msg'] = $this->toastParams['prefix'] . $errstr;
        $this->toastMessages[] = $toast;
        return true;
    }

    /**
     * PHP error handler, catch error types only E_WARNING | E_NOTICE | E_USER_WARNING | E_USER_NOTICE
     *
     * @param int    $errno
     * @param string $errstr
     * @param string $errfile
     * @param int    $errline
     *
     * @return boolean
     */
    public static function phpErrorHandler($errno, $errstr, $errfile, $errline)
    {
        static $base = null;

        $proc = false;

        if (is_null($base)) {
            $base = dirname(__FILE__) . DIRECTORY_SEPARATOR;
        }

        if (!(error_reporting() & $errno)) {
            return $proc;
        }

        // Do not report real path
        if (strpos($errfile, $base) === 0) {
            $errfile = str_replace($base, '', $errfile);
        } else if ($pos = strrpos($errfile, '/vendor/')) {
            $errfile = substr($errfile, $pos + 1);
        } else {
            $errfile = basename($errfile);
        }

        switch ($errno) {
            case E_WARNING:
            case E_USER_WARNING:
                elFinder::$phpErrors[] = "WARNING: $errstr in $errfile line $errline.";
                $proc = true;
                break;

            case E_NOTICE:
            case E_USER_NOTICE:
                elFinder::$phpErrors[] = "NOTICE: $errstr in $errfile line $errline.";
                $proc = true;
                break;

            case E_RECOVERABLE_ERROR:
                elFinder::$phpErrors[] = "RECOVERABLE_ERROR: $errstr in $errfile line $errline.";
                $proc = true;
                break;
        }

        // E_STRICT is deprecated; see https://wiki.php.net/rfc/deprecations_php_8_4#remove_e_strict_error_level_and_deprecate_e_strict_constant
        if (defined('E_STRICT') && $errno === @E_STRICT) {
            elFinder::$phpErrors[] = "STRICT: $errstr in $errfile line $errline.";
            $proc = true;
        }

        if (defined('E_DEPRECATED')) {
            switch ($errno) {
                case E_DEPRECATED:
                case E_USER_DEPRECATED:
                    elFinder::$phpErrors[] = "DEPRECATED: $errstr in $errfile line $errline.";
                    $proc = true;
                    break;
            }
        }

        return $proc;
    }

    /***************************************************************************/
    /*                                   utils                                 */
    /***************************************************************************/

    /**
     * Return root - file's owner
     *
     * @param  string  file hash
     *
     * @return elFinderVolumeDriver|boolean (false)
     * @author Dmitry (dio) Levashov
     **/
    protected function volume($hash)
    {
        foreach ($this->volumes as $id => $v) {
            if (strpos('' . $hash, $id) === 0) {
                return $this->volumes[$id];
            }
        }
        return false;
    }

    /**
     * Return files info array
     *
     * @param  array $data one file info or files info
     *
     * @return array
     * @author Dmitry (dio) Levashov
     **/
    protected function toArray($data)
    {
        return isset($data['hash']) || !is_array($data) ? array($data) : $data;
    }

    /**
     * Return fils hashes list
     *
     * @param  array $files files info
     *
     * @return array
     * @author Dmitry (dio) Levashov
     **/
    protected function hashes($files)
    {
        $ret = array();
        foreach ($files as $file) {
            $ret[] = $file['hash'];
        }
        return $ret;
    }

    /**
     * Remove from files list hidden files and files with required mime types
     *
     * @param  array $files files info
     *
     * @return array
     * @author Dmitry (dio) Levashov
     **/
    protected function filter($files)
    {
        $exists = array();
        foreach ($files as $i => $file) {
            if (isset($file['hash'])) {
                if (isset($exists[$file['hash']]) || !empty($file['hidden']) || !$this->default->mimeAccepted($file['mime'])) {
                    unset($files[$i]);
                }
                $exists[$file['hash']] = true;
            }
        }
        return array_values($files);
    }

    protected function utime()
    {
        $time = explode(" ", microtime());
        return (double)$time[1] + (double)$time[0];
    }

    /**
     * Return Network mount volume unique ID
     *
     * @param  array  $netVolumes Saved netvolumes array
     * @param  string $prefix     Id prefix
     *
     * @return string|false
     * @author Naoki Sawada
     **/
    protected function getNetVolumeUniqueId($netVolumes = null, $prefix = 'nm')
    {
        if (is_null($netVolumes)) {
            $netVolumes = $this->getNetVolumes();
        }
        $ids = array();
        foreach ($netVolumes as $vOps) {
            if (isset($vOps['id']) && strpos($vOps['id'], $prefix) === 0) {
                $ids[$vOps['id']] = true;
            }
        }
        if (!$ids) {
            $id = $prefix . '1';
        } else {
            $i = 0;
            while (isset($ids[$prefix . ++$i]) && $i < 10000) ;
            $id = $prefix . $i;
            if (isset($ids[$id])) {
                $id = false;
            }
        }
        return $id;
    }

    /**
     * Is item locked?
     *
     * @param string $hash
     *
     * @return boolean
     */
    protected function itemLocked($hash)
    {
        if (!elFinder::$commonTempPath) {
            return false;
        }
        $lock = elFinder::$commonTempPath . DIRECTORY_SEPARATOR . self::filenameDecontaminate($hash) . '.lock';
        if (file_exists($lock)) {
            if (filemtime($lock) + $this->itemLockExpire < time()) {
                unlink($lock);
                return false;
            }
            return true;
        }

        return false;
    }

    /**
     * Do lock target item
     *
     * @param array|string $hashes
     * @param boolean      $autoUnlock
     *
     * @return void
     */
    protected function itemLock($hashes, $autoUnlock = true)
    {
        if (!elFinder::$commonTempPath) {
            return;
        }
        if (!is_array($hashes)) {
            $hashes = array($hashes);
        }
        foreach ($hashes as $hash) {
            $lock = elFinder::$commonTempPath . DIRECTORY_SEPARATOR . self::filenameDecontaminate($hash) . '.lock';
            if ($this->itemLocked($hash)) {
                $cnt = file_get_contents($lock) + 1;
            } else {
                $cnt = 1;
            }
            if (file_put_contents($lock, $cnt, LOCK_EX)) {
                if ($autoUnlock) {
                    $this->autoUnlocks[] = $hash;
                }
            }
        }
    }

    /**
     * Do unlock target item
     *
     * @param string $hash
     *
     * @return boolean
     */
    protected function itemUnlock($hash)
    {
        if (!$this->itemLocked($hash)) {
            return true;
        }
        $lock = elFinder::$commonTempPath . DIRECTORY_SEPARATOR . $hash . '.lock';
        $cnt = file_get_contents($lock);
        if (--$cnt < 1) {
            unlink($lock);
            return true;
        } else {
            file_put_contents($lock, $cnt, LOCK_EX);
            return false;
        }
    }

    /**
     * unlock locked items on command completion
     *
     * @return void
     */
    public function itemAutoUnlock()
    {
        if ($this->autoUnlocks) {
            foreach ($this->autoUnlocks as $hash) {
                $this->itemUnlock($hash);
            }
            $this->autoUnlocks = array();
        }
    }

    /**
     * Ensure directories recursively
     *
     * @param  object $volume Volume object
     * @param  string $target Target hash
     * @param  array  $dirs   Array of directory tree to ensure
     * @param  string $path   Relative path form target hash
     *
     * @return array|false      array('stats' => array([stat of maked directory]), 'hashes' => array('[path]' => '[hash]'), 'makes' => array([New directory hashes]), 'error' => array([Error name]))
     * @author Naoki Sawada
     **/
    protected function ensureDirsRecursively($volume, $target, $dirs, $path = '')
    {
        $res = array('stats' => array(), 'hashes' => array(), 'makes' => array(), 'error' => array());
        foreach ($dirs as $name => $sub) {
            $name = (string)$name;
            $dir = $newDir = null;
            if ((($parent = $volume->realpath($target)) && ($dir = $volume->dir($volume->getHash($parent, $name)))) || ($newDir = $volume->mkdir($target, $name))) {
                $_path = $path . '/' . $name;
                if ($newDir) {
                    $res['makes'][] = $newDir['hash'];
                    $dir = $newDir;
                }
                $res['stats'][] = $dir;
                $res['hashes'][$_path] = $dir['hash'];
                if (count($sub)) {
                    $res = array_merge_recursive($res, $this->ensureDirsRecursively($volume, $dir['hash'], $sub, $_path));
                }
            } else {
                $res['error'][] = $name;
            }
        }
        return $res;
    }

    /**
     * Sets the toast error handler.
     *
     * @param array $opts The options
     */
    public function setToastErrorHandler($opts)
    {
        $this->toastParams = $this->toastParamsDefault;
        if (!$opts) {
            restore_error_handler();
        } else {
            $this->toastParams = array_merge($this->toastParams, $opts);
            set_error_handler(array($this, 'toastErrorHandler'));
        }
    }

    /**
     * String encode convert to UTF-8
     *
     * @param      string  $str  Input string
     *
     * @return     string  UTF-8 string
     */
    public function utf8Encode($str)
    {
        static $mbencode = null;
        $str = (string) $str;
        if (@iconv('utf-8', 'utf-8//IGNORE', $str) === $str) {
            return $str;
        }

        if ($this->utf8Encoder) {
            return $this->utf8Encoder($str);
        }

        if ($mbencode === null) {
            $mbencode = function_exists('mb_convert_encoding') && function_exists('mb_detect_encoding');
        }

        if ($mbencode) {
            if ($enc = mb_detect_encoding($str, mb_detect_order(), true)) {
                $_str = mb_convert_encoding($str, 'UTF-8', $enc);
                if (@iconv('utf-8', 'utf-8//IGNORE', $_str) === $_str) {
                    return $_str;
                }
            }
        }
        return utf8_encode($str);
    }

    /***************************************************************************/
    /*                           static  utils                                 */
    /***************************************************************************/

    /**
     * Return full version of API that this connector supports all functions
     *
     * @return string
     */
    public static function getApiFullVersion()
    {
        return (string)self::$ApiVersion . '.' . (string)self::$ApiRevision;
    }

    /**
     * Return self::$commonTempPath
     *
     * @return     string  The common temporary path.
     */
    public static function getCommonTempPath()
    {
        return self::$commonTempPath;
    }

    /**
     * Return Is Animation Gif
     *
     * @param  string $path server local path of target image
     *
     * @return bool
     */
    public static function isAnimationGif($path)
    {
        list(, , $type) = getimagesize($path);
        switch ($type) {
            case IMAGETYPE_GIF:
                break;
            default:
                return false;
        }

        $imgcnt = 0;
        $fp = fopen($path, 'rb');
        fread($fp, 4);
        $c = fread($fp, 1);
        if (ord($c) != 0x39) {  // GIF89a
            return false;
        }

        while (!feof($fp)) {
            do {
                $c = fread($fp, 1);
            } while (ord($c) != 0x21 && !feof($fp));

            if (feof($fp)) {
                break;
            }

            $c2 = fread($fp, 2);
            if (bin2hex($c2) == "f904") {
                $imgcnt++;
                if ($imgcnt === 2) {
                    break;
                }
            }

            if (feof($fp)) {
                break;
            }
        }

        if ($imgcnt > 1) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * Return Is Animation Png
     *
     * @param  string $path server local path of target image
     *
     * @return bool
     */
    public static function isAnimationPng($path)
    {
        list(, , $type) = getimagesize($path);
        switch ($type) {
            case IMAGETYPE_PNG:
                break;
            default:
                return false;
        }

        $fp = fopen($path, 'rb');
        $img_bytes = fread($fp, 1024);
        fclose($fp);
        if ($img_bytes) {
            if (strpos(substr($img_bytes, 0, strpos($img_bytes, 'IDAT')), 'acTL') !== false) {
                return true;
            }
        }
        return false;
    }

    /**
     * Return Is seekable stream resource
     *
     * @param resource $resource
     *
     * @return bool
     */
    public static function isSeekableStream($resource)
    {
        $metadata = stream_get_meta_data($resource);
        return $metadata['seekable'];
    }

    /**
     * Rewind stream resource
     *
     * @param resource $resource
     *
     * @return void
     */
    public static function rewind($resource)
    {
        self::isSeekableStream($resource) && rewind($resource);
    }

    /**
     * Determines whether the specified resource is seekable url.
     *
     * @param      <type>   $resource  The resource
     *
     * @return     boolean  True if the specified resource is seekable url, False otherwise.
     */
    public static function isSeekableUrl($resource)
    {
        $id = (int)$resource;
        if (isset(elFinder::$seekableUrlFps[$id])) {
            return elFinder::$seekableUrlFps[$id];
        }
        return null;
    }

    /**
     * serialize and base64_encode of session data (If needed)
     *
     * @deprecated
     *
     * @param  mixed $var target variable
     *
     * @author Naoki Sawada
     * @return mixed|string
     */
    public static function sessionDataEncode($var)
    {
        if (self::$base64encodeSessionData) {
            $var = base64_encode(serialize($var));
        }
        return $var;
    }

    /**
     * base64_decode and unserialize of session data  (If needed)
     *
     * @deprecated
     *
     * @param  mixed $var     target variable
     * @param  bool  $checkIs data type for check (array|string|object|int)
     *
     * @author Naoki Sawada
     * @return bool|mixed
     */
    public static function sessionDataDecode(&$var, $checkIs = null)
    {
        if (self::$base64encodeSessionData) {
            $data = unserialize(base64_decode($var));
        } else {
            $data = $var;
        }
        $chk = true;
        if ($checkIs) {
            switch ($checkIs) {
                case 'array':
                    $chk = is_array($data);
                    break;
                case 'string':
                    $chk = is_string($data);
                    break;
                case 'object':
                    $chk = is_object($data);
                    break;
                case 'int':
                    $chk = is_int($data);
                    break;
            }
        }
        if (!$chk) {
            unset($var);
            return false;
        }
        return $data;
    }

    /**
     * Call session_write_close() if session is restarted
     *
     * @deprecated
     * @return void
     */
    public static function sessionWrite()
    {
        if (session_id()) {
            session_write_close();
        }
    }

    /**
     * Return elFinder static variable
     *
     * @param $key
     *
     * @return mixed|null
     */
    public static function getStaticVar($key)
    {
        return isset(elFinder::$$key) ? elFinder::$$key : null;
    }

    /**
     * Extend PHP execution time limit and also check connection is aborted
     *
     * @param Int $time
     *
     * @return void
     * @throws elFinderAbortException
     */
    public static function extendTimeLimit($time = null)
    {
        static $defLimit = null;
        if (!self::aborted()) {
            if (is_null($defLimit)) {
                $defLimit = ini_get('max_execution_time');
            }
            if ($defLimit != 0) {
                $time = is_null($time) ? $defLimit : max($defLimit, $time);
                set_time_limit($time);
            }
        } else {
            throw new elFinderAbortException();
        }
    }

    /**
     * Check connection is aborted
     * Script stop immediately if connection aborted
     *
     * @return void
     * @throws elFinderAbortException
     */
    public static function checkAborted()
    {
        elFinder::extendTimeLimit();
    }

    /**
     * Return bytes from php.ini value
     *
     * @param string $iniName
     * @param string $val
     *
     * @return number
     */
    public static function getIniBytes($iniName = '', $val = '')
    {
        if ($iniName !== '') {
            $val = ini_get($iniName);
            if ($val === false) {
                return 0;
            }
        }
        $val = trim($val, "bB \t\n\r\0\x0B");
        $last = strtolower($val[strlen($val) - 1]);
        $val = sprintf('%u', $val);
        switch ($last) {
            case 'y':
                $val = elFinder::xKilobyte($val);
            case 'z':
                $val = elFinder::xKilobyte($val);
            case 'e':
                $val = elFinder::xKilobyte($val);
            case 'p':
                $val = elFinder::xKilobyte($val);
            case 't':
                $val = elFinder::xKilobyte($val);
            case 'g':
                $val = elFinder::xKilobyte($val);
            case 'm':
                $val = elFinder::xKilobyte($val);
            case 'k':
                $val = elFinder::xKilobyte($val);
        }
        return $val;
    }

    /**
     * Return X 1KByte
     *
     * @param      integer|string  $val    The value
     *
     * @return     number
     */
    public static function xKilobyte($val)
    {
        if (strpos((string)$val * 1024, 'E') !== false) {
            if (strpos((string)$val * 1.024, 'E') === false) {
                $val *= 1.024;
            }
            $val .= '000';
        } else {
            $val *= 1024;
        }
        return $val;
    }

    /**
     * Get script url.
     *
     * @return string full URL
     * @author Naoki Sawada
     */
    public static function getConnectorUrl()
    {
        if (defined('ELFINDER_CONNECTOR_URL')) {
            return ELFINDER_CONNECTOR_URL;
        }

        $https = (!empty($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) !== 'off');
        $url = ($https ? 'https://' : 'http://')
            . $_SERVER['SERVER_NAME']                                              // host
            . ((empty($_SERVER['SERVER_PORT']) || (!$https && $_SERVER['SERVER_PORT'] == 80) || ($https && $_SERVER['SERVER_PORT'] == 443)) ? '' : (':' . $_SERVER['SERVER_PORT']))  // port
            . $_SERVER['REQUEST_URI'];                                             // path & query
        list($url) = explode('?', $url);

        return $url;
    }

    /**
     * Get stream resource pointer by URL
     *
     * @param array $data array('target'=>'URL', 'headers' => array())
     * @param int   $redirectLimit
     *
     * @return resource|boolean
     * @author Naoki Sawada
     */
    public static function getStreamByUrl($data, $redirectLimit = 5)
    {
        if (isset($data['target'])) {
            $data = array(
                'cnt' => 0,
                'url' => $data['target'],
                'headers' => isset($data['headers']) ? $data['headers'] : array(),
                'postData' => isset($data['postData']) ? $data['postData'] : array(),
                'cookies' => array(),
            );
        }
        if ($data['cnt'] > $redirectLimit) {
            return false;
        }
        $dlurl = $data['url'];
        $data['url'] = '';
        $headers = $data['headers'];

        if ($dlurl) {
            $url = parse_url($dlurl);
            $ports = array(
                'http' => '80',
                'https' => '443',
                'ftp' => '21'
            );
            $url['scheme'] = strtolower($url['scheme']);
            if (!isset($url['port']) && isset($ports[$url['scheme']])) {
                $url['port'] = $ports[$url['scheme']];
            }
            if (!isset($url['port'])) {
                return false;
            }
            $cookies = array();
            if ($data['cookies']) {
                foreach ($data['cookies'] as $d => $c) {
                    if (strpos($url['host'], $d) !== false) {
                        $cookies[] = $c;
                    }
                }
            }

            $transport = ($url['scheme'] === 'https') ? 'ssl' : 'tcp';
            $query = isset($url['query']) ? '?' . $url['query'] : '';
            if (!($stream = stream_socket_client($transport . '://' . $url['host'] . ':' . $url['port']))) {
                return false;
            }

            $body = '';
            if (!empty($data['postData'])) {
                $method = 'POST';
                if (is_array($data['postData'])) {
                    $body = http_build_query($data['postData']);
                } else {
                    $body = $data['postData'];
                }
            } else {
                $method = 'GET';
            }

            $sends = array();
            $sends[] = "$method {$url['path']}{$query} HTTP/1.1";
            $sends[] = "Host: {$url['host']}";
            foreach ($headers as $header) {
                $sends[] = trim($header, "\r\n");
            }
            $sends[] = 'Connection: Close';
            if ($cookies) {
                $sends[] = 'Cookie: ' . implode('; ', $cookies);
            }
            if ($method === 'POST') {
                $sends[] = 'Content-Type: application/x-www-form-urlencoded';
                $sends[] = 'Content-Length: ' . strlen($body);
            }
            $sends[] = "\r\n" . $body;

            stream_set_timeout($stream, 300);
            fputs($stream, join("\r\n", $sends) . "\r\n");

            while (($res = trim(fgets($stream))) !== '') {
                // find redirect
                if (preg_match('/^Location: (.+)$/i', $res, $m)) {
                    $data['url'] = $m[1];
                }
                // fetch cookie
                if (strpos($res, 'Set-Cookie:') === 0) {
                    $domain = $url['host'];
                    if (preg_match('/^Set-Cookie:(.+)(?:domain=\s*([^ ;]+))?/i', $res, $c1)) {
                        if (!empty($c1[2])) {
                            $domain = trim($c1[2]);
                        }
                        if (preg_match('/([^ ]+=[^;]+)/', $c1[1], $c2)) {
                            $data['cookies'][$domain] = $c2[1];
                        }
                    }
                }
                // is seekable url
                if (preg_match('/^(Accept-Ranges|Content-Range): bytes/i', $res)) {
                    elFinder::$seekableUrlFps[(int)$stream] = true;
                }
            }
            if ($data['url']) {
                ++$data['cnt'];
                fclose($stream);

                return self::getStreamByUrl($data, $redirectLimit);
            }

            return $stream;
        }

        return false;
    }

    /**
     * Gets the fetch cookie file for curl.
     *
     * @return string  The fetch cookie file.
     */
    public function getFetchCookieFile()
    {
        $file = '';
        if ($tmpDir = $this->getTempDir()) {
            $file = $tmpDir . '/.elFinderAnonymousCookie';
        }
        return $file;
    }

    /**
     * Call curl_exec() with supported redirect on `safe_mode` or `open_basedir`
     *
     * @param resource $curl
     * @param array    $options
     * @param array    $headers
     * @param array    $postData
     *
     * @throws \Exception
     * @return mixed
     * @author Naoki Sawada
     */
    public static function curlExec($curl, $options = array(), $headers = array(), $postData = array())
    {
        $followLocation = (!ini_get('safe_mode') && !ini_get('open_basedir'));
        if ($followLocation) {
            curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
        }

        if ($options) {
            curl_setopt_array($curl, $options);
        }

        if ($headers) {
            curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
        }

        $result = curl_exec($curl);

        if (!$followLocation && $redirect = curl_getinfo($curl, CURLINFO_REDIRECT_URL)) {
            if ($stream = self::getStreamByUrl(array('target' => $redirect, 'headers' => $headers, 'postData' => $postData))) {
                $result = stream_get_contents($stream);
            }
        }

        if ($result === false) {
            if (curl_errno($curl)) {
                throw new \Exception('curl_exec() failed: ' . curl_error($curl));
            } else {
                throw new \Exception('curl_exec(): empty response');
            }
        }

        curl_close($curl);

        return $result;
    }

    /**
     * Return bool that current request was aborted by client side
     *
     * @return boolean
     */
    public static function aborted()
    {
        if ($file = self::$abortCheckFile) {
            (version_compare(PHP_VERSION, '5.3.0') >= 0) ? clearstatcache(true, $file) : clearstatcache();
            if (!is_file($file)) {
                // GC (expire 12h)
                list($ptn) = explode('elfreq', $file);
                self::GlobGC($ptn . 'elfreq*', 43200);
                return true;
            }
        }
        return false;
    }

    /**
     * Return array ["name without extention", "extention"] by filename
     *
     * @param string $name
     *
     * @return array
     */
    public static function splitFileExtention($name)
    {
        if (preg_match('/^(.+?)?\.((?:tar\.(?:gz|bz|bz2|z|lzo))|cpio\.gz|ps\.gz|xcf\.(?:gz|bz2)|[a-z0-9]{1,10})$/i', $name, $m)) {
            return array((string)$m[1], $m[2]);
        } else {
            return array($name, '');
        }
    }

    /**
     * Gets the memory size by imageinfo.
     *
     * @param      array $imgInfo array that result of getimagesize()
     *
     * @return     integer  The memory size by imageinfo.
     */
    public static function getMemorySizeByImageInfo($imgInfo)
    {
        $width = $imgInfo[0];
        $height = $imgInfo[1];
        $bits = isset($imgInfo['bits']) ? $imgInfo['bits'] : 24;
        $channels = isset($imgInfo['channels']) ? $imgInfo['channels'] : 3;
        return round(($width * $height * $bits * $channels / 8 + Pow(2, 16)) * 1.65);
    }

    /**
     * Auto expand memory for GD processing
     *
     * @param      array $imgInfos The image infos
     */
    public static function expandMemoryForGD($imgInfos)
    {
        if (elFinder::$memoryLimitGD != 0 && $imgInfos && is_array($imgInfos)) {
            if (!is_array($imgInfos[0])) {
                $imgInfos = array($imgInfos);
            }
            $limit = self::getIniBytes('', elFinder::$memoryLimitGD);
            $memLimit = self::getIniBytes('memory_limit');
            $needs = 0;
            foreach ($imgInfos as $info) {
                $needs += self::getMemorySizeByImageInfo($info);
            }
            $needs += memory_get_usage();
            if ($needs > $memLimit && ($limit == -1 || $limit > $needs)) {
                ini_set('memory_limit', $needs);
            }
        }
    }

    /**
     * Decontaminate of filename
     *
     * @param      String  $name   The name
     *
     * @return     String  Decontaminated filename
     */
    public static function filenameDecontaminate($name)
    {
        // Directory traversal defense
        if (DIRECTORY_SEPARATOR === '\\') {
            $name = str_replace('\\', '/', $name);
        }
        $parts = explode('/', trim($name, '/'));
        $name = array_pop($parts); 
        return $name;
    }

    /**
     * Execute shell command
     *
     * @param  string $command      command line
     * @param  string $output       stdout strings
     * @param  int    $return_var   process exit code
     * @param  string $error_output stderr strings
     * @param  null   $cwd          cwd
     *
     * @return int exit code
     * @throws elFinderAbortException
     * @author Alexey Sukhotin
     */
    public static function procExec($command, &$output = '', &$return_var = -1, &$error_output = '', $cwd = null)
    {

        static $allowed = null;

        if ($allowed === null) {
            if ($allowed = function_exists('proc_open')) {
                if ($disabled = ini_get('disable_functions')) {
                    $funcs = array_map('trim', explode(',', $disabled));
                    $allowed = !in_array('proc_open', $funcs);
                }
            }
        }

        if (!$allowed) {
            $return_var = -1;
            return $return_var;
        }

        if (!$command) {
            $return_var = 0;
            return $return_var;
        }

        $descriptorspec = array(
            0 => array("pipe", "r"),  // stdin
            1 => array("pipe", "w"),  // stdout
            2 => array("pipe", "w")   // stderr
        );

        $process = proc_open($command, $descriptorspec, $pipes, $cwd, null);

        if (is_resource($process)) {
            stream_set_blocking($pipes[1], 0);
            stream_set_blocking($pipes[2], 0);

            fclose($pipes[0]);

            $tmpout = '';
            $tmperr = '';
            while (feof($pipes[1]) === false || feof($pipes[2]) === false) {
                elFinder::extendTimeLimit();
                $read = array($pipes[1], $pipes[2]);
                $write = null;
                $except = null;
                $ret = stream_select($read, $write, $except, 1);
                if ($ret === false) {
                    // error
                    break;
                } else if ($ret === 0) {
                    // timeout
                    continue;
                } else {
                    foreach ($read as $sock) {
                        if ($sock === $pipes[1]) {
                            $tmpout .= fread($sock, 4096);
                        } else if ($sock === $pipes[2]) {
                            $tmperr .= fread($sock, 4096);
                        }
                    }
                }
            }

            fclose($pipes[1]);
            fclose($pipes[2]);

            $output = $tmpout;
            $error_output = $tmperr;
            $return_var = proc_close($process);

        } else {
            $return_var = -1;
        }

        return $return_var;

    }

    /***************************************************************************/
    /*                                 callbacks                               */
    /***************************************************************************/

    /**
     * Get command name of binded "commandName.subName"
     *
     * @param string $cmd
     *
     * @return string
     */
    protected static function getCmdOfBind($cmd)
    {
        list($ret) = explode('.', $cmd);
        return trim($ret);
    }

    /**
     * Add subName to commandName
     *
     * @param string $cmd
     * @param string $sub
     *
     * @return string
     */
    protected static function addSubToBindName($cmd, $sub)
    {
        return $cmd . '.' . trim($sub);
    }

    /**
     * Remove a file if connection is disconnected
     *
     * @param string $file
     */
    public static function rmFileInDisconnected($file)
    {
        (connection_aborted() || connection_status() !== CONNECTION_NORMAL) && is_file($file) && unlink($file);
    }

    /**
     * Call back function on shutdown
     *  - delete files in $GLOBALS['elFinderTempFiles']
     */
    public static function onShutdown()
    {
        self::$abortCheckFile = null;
        if (!empty($GLOBALS['elFinderTempFps'])) {
            foreach (array_keys($GLOBALS['elFinderTempFps']) as $fp) {
                is_resource($fp) && fclose($fp);
            }
        }
        if (!empty($GLOBALS['elFinderTempFiles'])) {
            foreach (array_keys($GLOBALS['elFinderTempFiles']) as $f) {
                //Make sure paths are safe before deleting them
                $tf = elFinder::$commonTempPath . DIRECTORY_SEPARATOR . basename($f);
                is_file($tf) && is_writable($tf) && unlink($tf);
            }
        unset($f);
        }

        //Delete abort file paths
        if(!empty($GLOBALS['elFinderAbortFiles'])) {
            foreach (array_keys($GLOBALS['elFinderAbortFiles']) as $f) {
                //Make sure paths are safe before deleting them
                $tf = elFinder::$connectionFlagsPath . DIRECTORY_SEPARATOR . basename($f);
                is_file($tf) && is_writable($tf) && unlink($tf);
            }
            unset($f);
        }

    }

    /**
     * Garbage collection with glob
     *
     * @param string  $pattern
     * @param integer $time
     */
    public static function GlobGC($pattern, $time)
    {
        $now = time();
        foreach (glob($pattern) as $file) {
            (filemtime($file) < ($now - $time)) && unlink($file);
        }
    }

} // END class

/**
 * Custom exception class for aborting request
 */
class elFinderAbortException extends Exception
{
}

class elFinderTriggerException extends Exception
{
}
