recca0120 / laravel-elfinder

lib/elFinderVolumeDropbox.class.php

<?php

elFinder::$netDrivers['dropbox'] = 'Dropbox';

/**
 * Simple elFinder driver for FTP.
 *
 * @author Dmitry (dio) Levashov
 * @author Cem (discofever)
 **/
class elFinderVolumeDropbox extends elFinderVolumeDriver
{
    /**
     * Driver id
     * Must be started from letter and contains [a-z0-9]
     * Used as part of volume id.
     *
     * @var string
     **/
    protected $driverId = 'd';

    /**
     * OAuth object.
     *
     * @var oauth
     **/
    protected $oauth = null;

    /**
     * Dropbox object.
     *
     * @var dropbox
     **/
    protected $dropbox = null;

    /**
     * Directory for meta data caches
     * If not set driver not cache meta data.
     *
     * @var string
     **/
    protected $metaCache = '';

    /**
     * Last API error message.
     *
     * @var string
     **/
    protected $apiError = '';

    /**
     * Directory for tmp files
     * If not set driver will try to use tmbDir as tmpDir.
     *
     * @var string
     **/
    protected $tmp = '';

    /**
     * Dropbox.com uid.
     *
     * @var string
     **/
    protected $dropboxUid = '';

    /**
     * Dropbox download host, replaces 'www.dropbox.com' of shares URL.
     *
     * @var string
     */
    private $dropbox_dlhost = 'dl.dropboxusercontent.com';

    private $dropbox_phpFound = false;

    private $DB_TableName = '';

    private $tmbPrefix = '';

    /**
     * Constructor
     * Extend options with required fields.
     *
     * @author Dmitry (dio) Levashov
     * @author Cem (DiscoFever)
     */
    public function __construct()
    {

        // check with composer
        $this->dropbox_phpFound = class_exists('Dropbox_API');

        if (! $this->dropbox_phpFound) {
            // check with pear
            if (include_once 'Dropbox/autoload.php') {
                $this->dropbox_phpFound = in_array('Dropbox_autoload', spl_autoload_functions());
            }
        }

        $opts = [
            'consumerKey' => '',
            'consumerSecret' => '',
            'accessToken' => '',
            'accessTokenSecret' => '',
            'dropboxUid' => '',
            'root' => 'dropbox',
            'path' => '/',
            'separator' => '/',
            'PDO_DSN' => '', // if empty use 'sqlite:(metaCachePath|tmbPath)/elFinder_dropbox_db_(hash:dropboxUid+consumerSecret)'
            'PDO_User' => '',
            'PDO_Pass' => '',
            'PDO_Options' => [],
            'PDO_DBName' => 'dropbox',
            'treeDeep' => 0,
            'tmbPath' => '',
            'tmbURL' => '',
            'tmpPath' => '',
            'getTmbSize' => 'large', // small: 32x32, medium or s: 64x64, large or m: 128x128, l: 640x480, xl: 1024x768
            'metaCachePath' => '',
            'metaCacheTime' => '600', // 10m
            'acceptedName' => '#^[^/\\?*:|"<>]*[^./\\?*:|"<>]$#',
            'rootCssClass' => 'elfinder-navbar-root-dropbox',
        ];
        $this->options = array_merge($this->options, $opts);
        $this->options['mimeDetect'] = 'internal';
    }

    /**
     * Prepare
     * Call from elFinder::netmout() before volume->mount().
     *
     * @param $options
     * @return array
     * @author Naoki Sawada
     */
    public function netmountPrepare($options)
    {
        if (empty($options['consumerKey']) && defined('ELFINDER_DROPBOX_CONSUMERKEY')) {
            $options['consumerKey'] = ELFINDER_DROPBOX_CONSUMERKEY;
        }
        if (empty($options['consumerSecret']) && defined('ELFINDER_DROPBOX_CONSUMERSECRET')) {
            $options['consumerSecret'] = ELFINDER_DROPBOX_CONSUMERSECRET;
        }

        if ($options['user'] === 'init') {
            if (! $this->dropbox_phpFound || empty($options['consumerKey']) || empty($options['consumerSecret']) || ! class_exists('PDO', false)) {
                return ['exit' => true, 'body' => '{msg:errNetMountNoDriver}'];
            }

            if (defined('ELFINDER_DROPBOX_USE_CURL_PUT')) {
                $this->oauth = new Dropbox_OAuth_Curl($options['consumerKey'], $options['consumerSecret']);
            } else {
                if (class_exists('OAuth', false)) {
                    $this->oauth = new Dropbox_OAuth_PHP($options['consumerKey'], $options['consumerSecret']);
                } else {
                    if (! class_exists('HTTP_OAuth_Consumer')) {
                        // We're going to try to load in manually
                        include 'HTTP/OAuth/Consumer.php';
                    }
                    if (class_exists('HTTP_OAuth_Consumer', false)) {
                        $this->oauth = new Dropbox_OAuth_PEAR($options['consumerKey'], $options['consumerSecret']);
                    }
                }
            }

            if (! $this->oauth) {
                return ['exit' => true, 'body' => '{msg:errNetMountNoDriver}'];
            }

            if ($options['pass'] === 'init') {
                $html = '';
                if ($sessionToken = $this->session->get('DropboxTokens')) {
                    // token check
                    try {
                        list(, $accessToken, $accessTokenSecret) = $sessionToken;
                        $this->oauth->setToken($accessToken, $accessTokenSecret);
                        $this->dropbox = new Dropbox_API($this->oauth, $this->options['root']);
                        $this->dropbox->getAccountInfo();
                        $script = '<script>
							$("#'.$options['id'].'").elfinder("instance").trigger("netmount", {protocol: "dropbox", mode: "done"});
						</script>';
                        $html = $script;
                    } catch (Dropbox_Exception $e) {
                        $this->session->remove('DropboxTokens');
                    }
                }
                if (! $html) {
                    // get customdata
                    $cdata = '';
                    $innerKeys = ['cmd', 'host', 'options', 'pass', 'protocol', 'user'];
                    $this->ARGS = $_SERVER['REQUEST_METHOD'] === 'POST' ? $_POST : $_GET;
                    foreach ($this->ARGS as $k => $v) {
                        if (! in_array($k, $innerKeys)) {
                            $cdata .= '&'.$k.'='.rawurlencode($v);
                        }
                    }
                    if (strpos($options['url'], 'http') !== 0) {
                        $options['url'] = elFinder::getConnectorUrl();
                    }
                    $callback = $options['url']
                               .'?cmd=netmount&protocol=dropbox&host=dropbox.com&user=init&pass=return&node='.$options['id'].$cdata;

                    try {
                        $tokens = $this->oauth->getRequestToken();
                        $url = $this->oauth->getAuthorizeUrl(rawurlencode($callback));
                    } catch (Dropbox_Exception $e) {
                        return ['exit' => true, 'body' => '{msg:errAccess}'];
                    }

                    $this->session->set('DropboxAuthTokens', $tokens);
                    $html = '<input id="elf-volumedriver-dropbox-host-btn" class="ui-button ui-widget ui-state-default ui-corner-all ui-button-text-only" value="{msg:btnApprove}" type="button" onclick="window.open(\''.$url.'\')">';
                    $html .= '<script>
						$("#'.$options['id'].'").elfinder("instance").trigger("netmount", {protocol: "dropbox", mode: "makebtn"});
					</script>';
                }

                return ['exit' => true, 'body' => $html];
            } else {
                $this->oauth->setToken($this->session->get('DropboxAuthTokens'));
                $this->session->remove('DropboxAuthTokens');
                $tokens = $this->oauth->getAccessToken();
                $this->session->set('DropboxTokens', [$_GET['uid'], $tokens['token'], $tokens['token_secret']]);

                $out = [
                    'node' => $_GET['node'],
                    'json' => '{"protocol": "dropbox", "mode": "done"}',
                    'bind' => 'netmount',
                ];

                return ['exit' => 'callback', 'out' => $out];
            }
        }
        if ($sessionToken = $this->session->get('DropboxTokens')) {
            list($options['dropboxUid'], $options['accessToken'], $options['accessTokenSecret']) = $sessionToken;
        }
        unset($options['user'], $options['pass']);

        return $options;
    }

    /**
     * process of on netunmount
     * Drop table `dropbox` & rm thumbs.
     *
     * @param $netVolumes
     * @param $key
     * @return bool
     * @internal param array $options
     */
    public function netunmount($netVolumes, $key)
    {
        $count = 0;
        $dropboxUid = '';
        if (isset($netVolumes[$key])) {
            $dropboxUid = $netVolumes[$key]['dropboxUid'];
        }
        foreach ($netVolumes as $volume) {
            if ($volume['host'] === 'dropbox' && $volume['dropboxUid'] === $dropboxUid) {
                $count++;
            }
        }
        if ($count === 1) {
            $this->DB->exec('drop table '.$this->DB_TableName);
            foreach (glob(rtrim($this->options['tmbPath'], '\\/').DIRECTORY_SEPARATOR.$this->tmbPrefix.'*.png') as $tmb) {
                unlink($tmb);
            }
        }

        return true;
    }

    /*********************************************************************/
    /*                               FS API                              */
    /*********************************************************************/

    /**
     * Close opened connection.
     *
     * @return void
     * @author Dmitry (dio) Levashov
     **/
    public function umount()
    {
    }

    /**
     * Return content URL.
     *
     * @param string  $hash  file hash
     * @param array $options options
     * @return array
     * @author Naoki Sawada
     **/
    public function getContentUrl($hash, $options = [])
    {
        if (($file = $this->file($hash)) == false || ! $file['url'] || $file['url'] == 1) {
            $path = $this->decode($hash);
            $cache = $this->getDBdat($path);
            $url = '';
            if (isset($cache['share']) && strpos($cache['share'], $this->dropbox_dlhost) !== false) {
                $res = $this->getHttpResponseHeader($cache['share']);
                if (preg_match("/^HTTP\/[01\.]+ ([0-9]{3})/", $res, $match)) {
                    if ($match[1] < 400) {
                        $url = $cache['share'];
                    }
                }
            }
            if (! $url) {
                try {
                    $res = $this->dropbox->share($path, null, false);
                    $url = $res['url'];
                    if (strpos($url, 'www.dropbox.com') === false) {
                        $res = $this->getHttpResponseHeader($url);
                        if (preg_match('/^location:\s*(http[^\s]+)/im', $res, $match)) {
                            $url = $match[1];
                        }
                    }
                    list($url) = explode('?', $url);
                    $url = str_replace('www.dropbox.com', $this->dropbox_dlhost, $url);
                    if (! isset($cache['share']) || $cache['share'] !== $url) {
                        $cache['share'] = $url;
                        $this->updateDBdat($path, $cache);
                    }
                } catch (Dropbox_Exception $e) {
                    return false;
                }
            }

            return $url;
        }

        return $file['url'];
    }

    /*********************************************************************/
    /*                        INIT AND CONFIGURE                         */
    /*********************************************************************/

    /**
     * Prepare FTP connection
     * Connect to remote server and check if credentials are correct, if so, store the connection id in $ftp_conn.
     *
     * @return bool
     * @author Dmitry (dio) Levashov
     * @author Cem (DiscoFever)
     **/
    protected function init()
    {
        if (! class_exists('PDO', false)) {
            return $this->setError('PHP PDO class is require.');
        }

        if (! $this->options['consumerKey']
        || ! $this->options['consumerSecret']
        || ! $this->options['accessToken']
        || ! $this->options['accessTokenSecret']) {
            return $this->setError('Required options undefined.');
        }

        if (empty($this->options['metaCachePath']) && defined('ELFINDER_DROPBOX_META_CACHE_PATH')) {
            $this->options['metaCachePath'] = ELFINDER_DROPBOX_META_CACHE_PATH;
        }

        // make net mount key
        $this->netMountKey = md5(implode('-', ['dropbox', $this->options['path']]));

        if (! $this->oauth) {
            if (defined('ELFINDER_DROPBOX_USE_CURL_PUT')) {
                $this->oauth = new Dropbox_OAuth_Curl($this->options['consumerKey'], $this->options['consumerSecret']);
            } else {
                if (class_exists('OAuth', false)) {
                    $this->oauth = new Dropbox_OAuth_PHP($this->options['consumerKey'], $this->options['consumerSecret']);
                } else {
                    if (! class_exists('HTTP_OAuth_Consumer')) {
                        // We're going to try to load in manually
                        include 'HTTP/OAuth/Consumer.php';
                    }
                    if (class_exists('HTTP_OAuth_Consumer', false)) {
                        $this->oauth = new Dropbox_OAuth_PEAR($this->options['consumerKey'], $this->options['consumerSecret']);
                    }
                }
            }
        }

        if (! $this->oauth) {
            return $this->setError('OAuth extension not loaded.');
        }

        // normalize root path
        $this->root = $this->options['path'] = $this->_normpath($this->options['path']);

        if (empty($this->options['alias'])) {
            $this->options['alias'] = ($this->options['path'] === '/') ? 'Dropbox.com' : 'Dropbox'.$this->options['path'];
        }

        $this->rootName = $this->options['alias'];

        try {
            $this->oauth->setToken($this->options['accessToken'], $this->options['accessTokenSecret']);
            $this->dropbox = new Dropbox_API($this->oauth, $this->options['root']);
        } catch (Dropbox_Exception $e) {
            $this->session->remove('DropboxTokens');

            return $this->setError('Dropbox error: '.$e->getMessage());
        }

        // user
        if (empty($this->options['dropboxUid'])) {
            try {
                $res = $this->dropbox->getAccountInfo();
                $this->options['dropboxUid'] = $res['uid'];
            } catch (Dropbox_Exception $e) {
                $this->session->remove('DropboxTokens');

                return $this->setError('Dropbox error: '.$e->getMessage());
            }
        }

        $this->dropboxUid = $this->options['dropboxUid'];
        $this->tmbPrefix = 'dropbox'.base_convert($this->dropboxUid, 10, 32);

        if (! empty($this->options['tmpPath'])) {
            if ((is_dir($this->options['tmpPath']) || mkdir($this->options['tmpPath'])) && is_writable($this->options['tmpPath'])) {
                $this->tmp = $this->options['tmpPath'];
            }
        }
        if (! $this->tmp && is_writable($this->options['tmbPath'])) {
            $this->tmp = $this->options['tmbPath'];
        }
        if (! $this->tmp && ($tmp = elFinder::getStaticVar('commonTempPath'))) {
            $this->tmp = $tmp;
        }

        if (! empty($this->options['metaCachePath'])) {
            if ((is_dir($this->options['metaCachePath']) || mkdir($this->options['metaCachePath'])) && is_writable($this->options['metaCachePath'])) {
                $this->metaCache = $this->options['metaCachePath'];
            }
        }
        if (! $this->metaCache && $this->tmp) {
            $this->metaCache = $this->tmp;
        }

        if (! $this->metaCache) {
            return $this->setError('Cache dirctory (metaCachePath or tmp) is require.');
        }

        // setup PDO
        if (! $this->options['PDO_DSN']) {
            $this->options['PDO_DSN'] = 'sqlite:'.$this->metaCache.DIRECTORY_SEPARATOR.'.elFinder_dropbox_db_'.md5($this->dropboxUid.$this->options['consumerSecret']);
        }
        // DataBase table name
        $this->DB_TableName = $this->options['PDO_DBName'];
        // DataBase check or make table
        try {
            $this->DB = new PDO($this->options['PDO_DSN'], $this->options['PDO_User'], $this->options['PDO_Pass'], $this->options['PDO_Options']);
            if (! $this->checkDB()) {
                return $this->setError('Can not make DB table');
            }
        } catch (PDOException $e) {
            return $this->setError('PDO connection failed: '.$e->getMessage());
        }

        $res = $this->deltaCheck($this->isMyReload());
        if ($res !== true) {
            if (is_string($res)) {
                return $this->setError($res);
            } else {
                return $this->setError('Could not check API "delta"');
            }
        }

        if (is_null($this->options['syncChkAsTs'])) {
            $this->options['syncChkAsTs'] = true;
        }
        if ($this->options['syncChkAsTs']) {
            // 'tsPlSleep' minmum 5 sec
            $this->options['tsPlSleep'] = max(5, $this->options['tsPlSleep']);
        } else {
            // 'lsPlSleep' minmum 10 sec
            $this->options['lsPlSleep'] = max(10, $this->options['lsPlSleep']);
        }

        return true;
    }

    /**
     * Configure after successful mount.
     *
     * @return string
     * @author Dmitry (dio) Levashov
     **/
    protected function configure()
    {
        parent::configure();

        $this->disabled[] = 'archive';
        $this->disabled[] = 'extract';
    }

    /**
     * Get delta data and DB update.
     *
     * @param bool $refresh force refresh
     * @return true|string error message
     */
    protected function deltaCheck($refresh = true)
    {
        $chk = false;
        if (! $refresh && $chk = $this->query('select dat from '.$this->DB_TableName.' where path=\'\' and fname=\'\' limit 1')) {
            $chk = unserialize($chk[0]);
        }
        if ($chk && ($chk['mtime'] + $this->options['metaCacheTime']) > $_SERVER['REQUEST_TIME']) {
            return true;
        }

        try {
            $more = true;
            $this->DB->beginTransaction();

            if ($res = $this->query('select dat from '.$this->DB_TableName.' where path=\'\' and fname=\'\' limit 1')) {
                $res = unserialize($res[0]);
                $cursor = $res['cursor'];
            } else {
                $cursor = '';
            }
            $delete = false;
            $reset = false;
            $ptimes = [];
            $now = time();
            do {
                ini_set('max_execution_time', 120);
                $_info = $this->dropbox->delta($cursor);
                if (! empty($_info['reset'])) {
                    $this->DB->exec('TRUNCATE table '.$this->DB_TableName);
                    $this->DB->exec('insert into '.$this->DB_TableName.' values(\'\', \'\', \''.serialize(['cursor' => '', 'mtime' => 0]).'\', 0);');
                    $this->DB->exec('insert into '.$this->DB_TableName.' values(\'/\', \'\', \''.serialize([
                        'path' => '/',
                        'is_dir' => 1,
                        'mime_type' => '',
                        'bytes' => 0,
                    ]).'\', 0);');
                    $reset = true;
                }
                $cursor = $_info['cursor'];

                foreach ($_info['entries'] as $entry) {
                    $key = strtolower($entry[0]);
                    $pkey = strtolower($this->_dirname($key));

                    $path = $this->DB->quote($pkey);
                    $fname = $this->DB->quote(strtolower($this->_basename($key)));
                    $where = 'where path='.$path.' and fname='.$fname;

                    if (empty($entry[1])) {
                        $ptimes[$pkey] = isset($ptimes[$pkey]) ? max([$now, $ptimes[$pkey]]) : $now;
                        $this->DB->exec('delete from '.$this->DB_TableName.' '.$where);
                        ! $delete && $delete = true;
                        continue;
                    }

                    $_itemTime = strtotime(isset($entry[1]['client_mtime']) ? $entry[1]['client_mtime'] : $entry[1]['modified']);
                    $ptimes[$pkey] = isset($ptimes[$pkey]) ? max([$_itemTime, $ptimes[$pkey]]) : $_itemTime;
                    $sql = 'select path from '.$this->DB_TableName.' '.$where.' limit 1';
                    if (! $reset && $this->query($sql)) {
                        $this->DB->exec('update '.$this->DB_TableName.' set dat='.$this->DB->quote(serialize($entry[1])).', isdir='.($entry[1]['is_dir'] ? 1 : 0).' '.$where);
                    } else {
                        $this->DB->exec('insert into '.$this->DB_TableName.' values ('.$path.', '.$fname.', '.$this->DB->quote(serialize($entry[1])).', '.(int) $entry[1]['is_dir'].')');
                    }
                }
            } while (! empty($_info['has_more']));

            // update time stamp of parent holder
            foreach ($ptimes as $_p => $_t) {
                if ($praw = $this->getDBdat($_p)) {
                    $_update = false;
                    if (isset($praw['client_mtime']) && $_t > strtotime($praw['client_mtime'])) {
                        $praw['client_mtime'] = date('r', $_t);
                        $_update = true;
                    }
                    if (isset($praw['modified']) && $_t > strtotime($praw['modified'])) {
                        $praw['modified'] = date('r', $_t);
                        $_update = true;
                    }
                    if ($_update) {
                        $pwhere = 'where path='.$this->DB->quote(strtolower($this->_dirname($_p))).' and fname='.$this->DB->quote(strtolower($this->_basename($_p)));
                        $this->DB->exec('update '.$this->DB_TableName.' set dat='.$this->DB->quote(serialize($praw)).' '.$pwhere);
                    }
                }
            }

            $this->DB->exec('update '.$this->DB_TableName.' set dat='.$this->DB->quote(serialize(['cursor' => $cursor, 'mtime' => $_SERVER['REQUEST_TIME']])).' where path=\'\' and fname=\'\'');
            if (! $this->DB->commit()) {
                $e = $this->DB->errorInfo();

                return $e[2];
            }
            if ($delete) {
                $this->DB->exec('vacuum');
            }
        } catch (Dropbox_Exception $e) {
            return $e->getMessage();
        }

        return true;
    }

    /**
     * Parse line from dropbox metadata output and return file stat (array).
     *
     * @param  string  $raw  line from ftp_rawlist() output
     * @return array
     * @author Dmitry Levashov
     **/
    protected function parseRaw($raw)
    {
        $stat = [];

        $stat['rev'] = isset($raw['rev']) ? $raw['rev'] : 'root';
        $stat['name'] = $this->_basename($raw['path']);
        $stat['mime'] = $raw['is_dir'] ? 'directory' : $raw['mime_type'];
        $stat['size'] = $stat['mime'] == 'directory' ? 0 : $raw['bytes'];
        $stat['ts'] = isset($raw['client_mtime']) ? strtotime($raw['client_mtime']) :
                        (isset($raw['modified']) ? strtotime($raw['modified']) : $_SERVER['REQUEST_TIME']);
        $stat['dirs'] = 0;
        if ($raw['is_dir']) {
            $stat['dirs'] = (int) (bool) $this->query('select path from '.$this->DB_TableName.' where isdir=1 and path='.$this->DB->quote(strtolower($raw['path'])));
        }

        if (! empty($raw['url'])) {
            $stat['url'] = $raw['url'];
        } elseif (! $this->disabledGetUrl) {
            $stat['url'] = '1';
        }
        if (isset($raw['width'])) {
            $stat['width'] = $raw['width'];
        }
        if (isset($raw['height'])) {
            $stat['height'] = $raw['height'];
        }

        return $stat;
    }

    /**
     * Cache dir contents.
     *
     * @param  string  $path  dir path
     * @return string
     * @author Dmitry Levashov
     **/
    protected function cacheDir($path)
    {
        $this->dirsCache[$path] = [];
        $hasDir = false;

        $res = $this->query('select dat from '.$this->DB_TableName.' where path='.$this->DB->quote(strtolower($path)));

        if ($res) {
            foreach ($res as $raw) {
                $raw = unserialize($raw);
                if ($stat = $this->parseRaw($raw)) {
                    $stat = $this->updateCache($raw['path'], $stat);
                    if (empty($stat['hidden']) && $path !== $raw['path']) {
                        if (! $hasDir && $stat['mime'] === 'directory') {
                            $hasDir = true;
                        }
                        $this->dirsCache[$path][] = $raw['path'];
                    }
                }
            }
        }

        if (isset($this->sessionCache['subdirs'])) {
            $this->sessionCache['subdirs'][$path] = $hasDir;
        }

        return $this->dirsCache[$path];
    }

    /**
     * Recursive files search.
     *
     * @param  string  $path   dir path
     * @param  string  $q      search string
     * @param  array   $mimes
     * @return array
     * @author Naoki Sawada
     **/
    protected function doSearch($path, $q, $mimes)
    {
        $result = [];
        $sth = $this->DB->prepare('select dat from '.$this->DB_TableName.' WHERE path LIKE ? AND fname LIKE ?');
        $sth->execute([(($path === '/') ? '' : strtolower($path)).'%', '%'.strtolower($q).'%']);
        $res = $sth->fetchAll(PDO::FETCH_COLUMN);
        $timeout = $this->options['searchTimeout'] ? $this->searchStart + $this->options['searchTimeout'] : 0;

        if ($res) {
            foreach ($res as $raw) {
                if ($timeout && $timeout < time()) {
                    $this->setError(elFinder::ERROR_SEARCH_TIMEOUT, $this->path($this->encode($path)));
                    break;
                }

                $raw = unserialize($raw);
                if ($stat = $this->parseRaw($raw)) {
                    if (! isset($this->cache[$raw['path']])) {
                        $stat = $this->updateCache($raw['path'], $stat);
                    }
                    if (! empty($stat['hidden']) || ($mimes && $stat['mime'] === 'directory') || ! $this->mimeAccepted($stat['mime'], $mimes)) {

The expression $mimes of type array is implicitly converted to a boolean; are you sure this is intended? If so, consider using ! empty($expr) instead to make it clear that you intend to check for an array without elements.

                        continue;
                    }
                    $stat = $this->stat($raw['path']);
                    $stat['path'] = $this->path($stat['hash']);
                    $result[] = $stat;
                }
            }
        }

        return $result;
    }

    /**
     * Copy file/recursive copy dir only in current volume.
     * Return new file path or false.
     *
     * @param  string  $src   source path
     * @param  string  $dst   destination dir path
     * @param  string  $name  new file name (optionaly)
     * @return string|false
     * @author Dmitry (dio) Levashov
     * @author Naoki Sawada
     **/
    protected function copy($src, $dst, $name)
    {
        $this->clearcache();

        return $this->_copy($src, $dst, $name)
        ? $this->_joinPath($dst, $name)
        : $this->setError(elFinder::ERROR_COPY, $this->_path($src));
    }

    /**
     * Remove file/ recursive remove dir.
     *
     * @param  string $path file path
     * @param  bool $force try to remove even if file locked
     * @param bool $recursive
     * @return bool
     * @author Dmitry (dio) Levashov
     * @author Naoki Sawada
     */
    protected function remove($path, $force = false, $recursive = false)
    {
        $stat = $this->stat($path);
        $stat['realpath'] = $path;
        $this->rmTmb($stat);
        $this->clearcache();

        if (empty($stat)) {
            return $this->setError(elFinder::ERROR_RM, $this->_path($path), elFinder::ERROR_FILE_NOT_FOUND);
        }

        if (! $force && ! empty($stat['locked'])) {
            return $this->setError(elFinder::ERROR_LOCKED, $this->_path($path));
        }

        if ($stat['mime'] == 'directory') {
            if (! $recursive && ! $this->_rmdir($path)) {
                return $this->setError(elFinder::ERROR_RM, $this->_path($path));
            }
        } else {
            if (! $recursive && ! $this->_unlink($path)) {
                return $this->setError(elFinder::ERROR_RM, $this->_path($path));
            }
        }

        $this->removed[] = $stat;

        return true;
    }

    /**
     * Create thumnbnail and return it's URL on success.
     *
     * @param  string $path file path
     * @param $stat
     * @return false|string
     * @internal param string $mime file mime type
     * @author Dmitry (dio) Levashov
     * @author Naoki Sawada
     */
    protected function createTmb($path, $stat)
    {
        if (! $stat || ! $this->canCreateTmb($path, $stat)) {
            return false;
        }

        $name = $this->tmbname($stat);
        $tmb = $this->tmbPath.DIRECTORY_SEPARATOR.$name;

        // copy image into tmbPath so some drivers does not store files on local fs
        if (! $data = $this->getThumbnail($path, $this->options['getTmbSize'])) {
            return false;
        }
        if (! file_put_contents($tmb, $data)) {
            return false;
        }

        $result = false;

        $tmbSize = $this->tmbSize;

        if (($s = getimagesize($tmb)) == false) {
            return false;
        }

        /* If image smaller or equal thumbnail size - just fitting to thumbnail square */
        if ($s[0] <= $tmbSize && $s[1] <= $tmbSize) {
            $result = $this->imgSquareFit($tmb, $tmbSize, $tmbSize, 'center', 'middle', $this->options['tmbBgColor'], 'png');
        } else {
            if ($this->options['tmbCrop']) {

                /* Resize and crop if image bigger than thumbnail */
                if (! (($s[0] > $tmbSize && $s[1] <= $tmbSize) || ($s[0] <= $tmbSize && $s[1] > $tmbSize)) || ($s[0] > $tmbSize && $s[1] > $tmbSize)) {
                    $result = $this->imgResize($tmb, $tmbSize, $tmbSize, true, false, 'png');
                }

                if (($s = getimagesize($tmb)) != false) {
                    $x = $s[0] > $tmbSize ? intval(($s[0] - $tmbSize) / 2) : 0;
                    $y = $s[1] > $tmbSize ? intval(($s[1] - $tmbSize) / 2) : 0;
                    $result = $this->imgCrop($tmb, $tmbSize, $tmbSize, $x, $y, 'png');
                }
            } else {
                $result = $this->imgResize($tmb, $tmbSize, $tmbSize, true, true, 'png');
            }

            $result = $this->imgSquareFit($tmb, $tmbSize, $tmbSize, 'center', 'middle', $this->options['tmbBgColor'], 'png');
        }

        if (! $result) {

The expression $result of type false|string is loosely compared to false; this is ambiguous if the string can be empty. You might want to explicitly use === false instead.

            unlink($tmb);

            return false;
        }

        return $name;
    }

    /**
     * Return thumbnail file name for required file.
     *
     * @param  array  $stat  file stat
     * @return string
     * @author Dmitry (dio) Levashov
     **/
    protected function tmbname($stat)
    {
        return $this->tmbPrefix.$stat['rev'].'.png';
    }

    /**
     * Get thumbnail from dropbox.com.
     * @param string $path
     * @param string $size
     * @return string | boolean
     */
    protected function getThumbnail($path, $size = 'small')
    {
        try {
            return $this->dropbox->getThumbnail($path, $size);
        } catch (Dropbox_Exception $e) {
            return false;
        }
    }

    /*********************** paths/urls *************************/

    /**
     * Return parent directory path.
     *
     * @param  string  $path  file path
     * @return string
     * @author Dmitry (dio) Levashov
     **/
    protected function _dirname($path)
    {
        return $this->_normpath(substr($path, 0, strrpos($path, '/')));
    }

    /**
     * Return file name.
     *
     * @param  string  $path  file path
     * @return string
     * @author Dmitry (dio) Levashov
     **/
    protected function _basename($path)
    {
        return substr($path, strrpos($path, '/') + 1);
    }

    /**
     * Join dir name and file name and retur full path.
     *
     * @param  string  $dir
     * @param  string  $name
     * @return string
     * @author Dmitry (dio) Levashov
     **/
    protected function _joinPath($dir, $name)
    {
        return $this->_normpath($dir.'/'.$name);
    }

    /**
     * Return normalized path, this works the same as os.path.normpath() in Python.
     *
     * @param  string  $path  path
     * @return string
     * @author Troex Nevelin
     **/
    protected function _normpath($path)
    {
        $path = '/'.ltrim($path, '/');

        return $path;
    }

    /**
     * Return file path related to root dir.
     *
     * @param  string  $path  file path
     * @return string
     * @author Dmitry (dio) Levashov
     **/
    protected function _relpath($path)
    {
        return $path;
    }

    /**
     * Convert path related to root dir into real path.
     *
     * @param  string  $path  file path
     * @return string
     * @author Dmitry (dio) Levashov
     **/
    protected function _abspath($path)
    {
        return $path;
    }

    /**
     * Return fake path started from root dir.
     *
     * @param  string  $path  file path
     * @return string
     * @author Dmitry (dio) Levashov
     **/
    protected function _path($path)
    {
        return $this->rootName.$this->_normpath(substr($path, strlen($this->root)));
    }

    /**
     * Return true if $path is children of $parent.
     *
     * @param  string  $path    path to check
     * @param  string  $parent  parent path
     * @return bool
     * @author Dmitry (dio) Levashov
     **/
    protected function _inpath($path, $parent)
    {
        return $path == $parent || strpos($path, $parent.'/') === 0;
    }

    /***************** file stat ********************/

    /**
     * Return stat for given path.
     * Stat contains following fields:
     * - (int)    size    file size in b. required
     * - (int)    ts      file modification time in unix time. required
     * - (string) mime    mimetype. required for folders, others - optionally
     * - (bool)   read    read permissions. required
     * - (bool)   write   write permissions. required
     * - (bool)   locked  is object locked. optionally
     * - (bool)   hidden  is object hidden. optionally
     * - (string) alias   for symlinks - link target path relative to root path. optionally
     * - (string) target  for symlinks - link target path. optionally.
     *
     * If file does not exists - returns empty array or false.
     *
     * @param  string  $path    file path
     * @return array|false
     * @author Dmitry (dio) Levashov
     **/
    protected function _stat($path)
    {
        //if (!empty($this->ARGS['reload']) && isset($this->ARGS['target']) && strpos($this->ARGS['target'], $this->id) === 0) {
        if ($this->isMyReload()) {
            $this->deltaCheck();
        }
        if ($raw = $this->getDBdat($path)) {
            return $this->parseRaw($raw);
        }

        return false;
    }

    /**
     * Return true if path is dir and has at least one childs directory.
     *
     * @param  string  $path  dir path
     * @return bool
     * @author Dmitry (dio) Levashov
     **/
    protected function _subdirs($path)
    {
        return ($stat = $this->stat($path)) && isset($stat['dirs']) ? $stat['dirs'] : false;
    }

    /**
     * Return object width and height
     * Ususaly used for images, but can be realize for video etc...
     *
     * @param  string  $path  file path
     * @param  string  $mime  file mime type
     * @return string
     * @author Dmitry (dio) Levashov
     **/
    protected function _dimensions($path, $mime)
    {
        if (strpos($mime, 'image') !== 0) {
            return '';
        }
        $cache = $this->getDBdat($path);
        if (isset($cache['width']) && isset($cache['height'])) {
            return $cache['width'].'x'.$cache['height'];
        }
        $ret = '';
        if ($work = $this->getWorkFile($path)) {
            if ($size = getimagesize($work)) {
                $cache['width'] = $size[0];
                $cache['height'] = $size[1];
                $this->updateDBdat($path, $cache);
                $ret = $size[0].'x'.$size[1];
            }
        }
        is_file($work) && unlink($work);

        return $ret;
    }

    /******************** file/dir content *********************/

    /**
     * Return files list in directory.
     *
     * @param  string  $path  dir path
     * @return array
     * @author Dmitry (dio) Levashov
     * @author Cem (DiscoFever)
     **/
    protected function _scandir($path)
    {
        return isset($this->dirsCache[$path])
            ? $this->dirsCache[$path]
            : $this->cacheDir($path);
    }

    /**
     * Open file and return file pointer.
     *
     * @param  string $path file path
     * @param string $mode
     * @return false|resource
     * @internal param bool $write open file for writing
     * @author Dmitry (dio) Levashov
     */
    protected function _fopen($path, $mode = 'rb')
    {
        if (($mode == 'rb' || $mode == 'r')) {
            try {
                $res = $this->dropbox->media($path);
                $url = parse_url($res['url']);
                $fp = stream_socket_client('ssl://'.$url['host'].':443');
                fwrite($fp, "GET {$url['path']} HTTP/1.0\r\n");
                fwrite($fp, "Host: {$url['host']}\r\n");
                fwrite($fp, "\r\n");
                while (trim(fgets($fp)) !== '') {
                }

                return $fp;
            } catch (Dropbox_Exception $e) {
                return false;
            }
        }

        if ($this->tmp) {
            $contents = $this->_getContents($path);

            if ($contents === false) {
                return false;
            }

            if ($local = $this->getTempFile($path)) {
                if (file_put_contents($local, $contents, LOCK_EX) !== false) {
                    return fopen($local, $mode);
                }
            }
        }

        return false;
    }

    /**
     * Close opened file.
     *
     * @param  resource $fp file pointer
     * @param string $path
     * @return bool
     * @author Dmitry (dio) Levashov
     */
    protected function _fclose($fp, $path = '')
    {
        fclose($fp);
        if ($path) {
            unlink($this->getTempFile($path));
        }
    }

    /********************  file/dir manipulations *************************/

    /**
     * Create dir and return created dir path or false on failed.
     *
     * @param  string  $path  parent dir path
     * @param string  $name  new directory name
     * @return string|bool
     * @author Dmitry (dio) Levashov
     **/
    protected function _mkdir($path, $name)
    {
        $path = $this->_normpath($path.'/'.$name);
        try {
            $this->dropbox->createFolder($path);
        } catch (Dropbox_Exception $e) {
            $this->deltaCheck();
            if ($this->dir($this->encode($path))) {
                return $path;
            }

            return $this->setError('Dropbox error: '.$e->getMessage());
        }
        $this->deltaCheck();

        return $path;
    }

    /**
     * Create file and return it's path or false on failed.
     *
     * @param  string  $path  parent dir path
     * @param string  $name  new file name
     * @return string|bool
     * @author Dmitry (dio) Levashov
     **/
    protected function _mkfile($path, $name)
    {
        return $this->_filePutContents($path.'/'.$name, '');
    }

    /**
     * Create symlink. FTP driver does not support symlinks.
     *
     * @param  string $target link target
     * @param  string $path symlink path
     * @param string $name
     * @return bool
     * @author Dmitry (dio) Levashov
     */
    protected function _symlink($target, $path, $name)
    {
        return false;
    }

    /**
     * Copy file into another file.
     *
     * @param  string  $source     source file path
     * @param  string  $targetDir  target directory path
     * @param  string  $name       new file name
     * @return bool
     * @author Dmitry (dio) Levashov
     **/
    protected function _copy($source, $targetDir, $name)
    {
        $path = $this->_normpath($targetDir.'/'.$name);
        try {
            $this->dropbox->copy($source, $path);
        } catch (Dropbox_Exception $e) {
            return $this->setError('Dropbox error: '.$e->getMessage());
        }
        $this->deltaCheck();

        return true;
    }

    /**
     * Move file into another parent dir.
     * Return new file path or false.
     *
     * @param  string $source source file path
     * @param $targetDir
     * @param  string $name file name
     * @return bool|string
     * @internal param string $target target dir path
     * @author Dmitry (dio) Levashov
     */
    protected function _move($source, $targetDir, $name)
    {
        $target = $this->_normpath($targetDir.'/'.$name);
        try {
            $this->dropbox->move($source, $target);
        } catch (Dropbox_Exception $e) {
            return $this->setError('Dropbox error: '.$e->getMessage());
        }
        $this->deltaCheck();

        return $target;
    }

    /**
     * Remove file.
     *
     * @param  string  $path  file path
     * @return bool
     * @author Dmitry (dio) Levashov
     **/
    protected function _unlink($path)
    {
        try {
            $this->dropbox->delete($path);
        } catch (Dropbox_Exception $e) {
            return $this->setError('Dropbox error: '.$e->getMessage());
        }
        $this->deltaCheck();

        return true;
    }

    /**
     * Remove dir.
     *
     * @param  string  $path  dir path
     * @return bool
     * @author Dmitry (dio) Levashov
     **/
    protected function _rmdir($path)
    {
        return $this->_unlink($path);
    }

    /**
     * Create new file and write into it from file pointer.
     * Return new file path or false on error.
     *
     * @param  resource $fp file pointer
     * @param string $path
     * @param  string $name file name
     * @param  array $stat file stat (required by some virtual fs)
     * @return bool|string
     * @internal param string $dir target dir path
     * @author Dmitry (dio) Levashov
     */
    protected function _save($fp, $path, $name, $stat)
    {
        if ($name) {
            $path .= '/'.$name;
        }
        $path = $this->_normpath($path);
        try {
            $this->dropbox->putFile($path, $fp);
        } catch (Dropbox_Exception $e) {
            return $this->setError('Dropbox error: '.$e->getMessage());
        }
        $this->deltaCheck();
        if (is_array($stat)) {
            $raw = $this->getDBdat($path);
            if (isset($stat['width'])) {
                $raw['width'] = $stat['width'];
            }
            if (isset($stat['height'])) {
                $raw['height'] = $stat['height'];
            }
            $this->updateDBdat($path, $raw);
        }

        return $path;
    }

    /**
     * Get file contents.
     *
     * @param  string  $path  file path
     * @return string|false
     * @author Dmitry (dio) Levashov
     **/
    protected function _getContents($path)
    {
        $contents = '';
        try {
            $contents = $this->dropbox->getFile($path);
        } catch (Dropbox_Exception $e) {
            return $this->setError('Dropbox error: '.$e->getMessage());
        }

        return $contents;
    }

    /**
     * Write a string to a file.
     *
     * @param  string  $path     file path
     * @param  string  $content  new file content
     * @return bool
     * @author Dmitry (dio) Levashov
     **/
    protected function _filePutContents($path, $content)
    {
        $res = false;

        if ($local = $this->getTempFile($path)) {
            if (file_put_contents($local, $content, LOCK_EX) !== false
            && ($fp = fopen($local, 'rb'))) {
                clearstatcache();
                $res = $this->_save($fp, $path, '', []);
                fclose($fp);
            }
            file_exists($local) && unlink($local);
        }

        return $res;
    }

    /**
     * Detect available archivers.
     *
     * @return array
     **/
    protected function _checkArchivers()
    {
        // die('Not yet implemented. (_checkArchivers)');
        return [];
    }

    /**
     * chmod implementation.
     *
     * @param string $path
     * @param string $mode
     * @return bool
     */
    protected function _chmod($path, $mode)
    {
        return false;
    }

    /**
     * Unpack archive.
     *
     * @param  string  $path  archive path
     * @param  array   $arc   archiver command and arguments (same as in $this->archivers)
     * @return true
     * @return void
     * @author Dmitry (dio) Levashov
     * @author Alexey Sukhotin
     **/
    protected function _unpack($path, $arc)
    {
        die('Not yet implemented. (_unpack)');
    }

    /**
     * Recursive symlinks search.
     *
     * @param  string  $path  file/dir path
     * @return bool
     * @author Dmitry (dio) Levashov
     **/
    protected function _findSymlinks($path)
    {
        die('Not yet implemented. (_findSymlinks)');
    }

    /**
     * Extract files from archive.
     *
     * @param  string  $path  archive path
     * @param  array   $arc   archiver command and arguments (same as in $this->archivers)
     * @return true
     * @author Dmitry (dio) Levashov,
     * @author Alexey Sukhotin
     **/
    protected function _extract($path, $arc)
    {
        die('Not yet implemented. (_extract)');
    }

    /**
     * Create archive and return its path.
     *
     * @param  string  $dir    target dir
     * @param  array   $files  files names list
     * @param  string  $name   archive name
     * @param  array   $arc    archiver options
     * @return string|bool
     * @author Dmitry (dio) Levashov,
     * @author Alexey Sukhotin
     **/
    protected function _archive($dir, $files, $name, $arc)
    {
        die('Not yet implemented. (_archive)');
    }

    /**
     * Check DB for delta cache.
     *
     * @return bool
     */
    private function checkDB()
    {
        $res = $this->query('SELECT * FROM sqlite_master WHERE type=\'table\' AND name=\''.$this->DB_TableName.'\'');
        if ($res && isset($_REQUEST['init'])) {
            // check is index(nameidx) UNIQUE?
            $chk = $this->query('SELECT sql FROM sqlite_master WHERE type=\'index\' and name=\'nameidx\'');
            if (! $chk || strpos(strtoupper($chk[0]), 'UNIQUE') === false) {
                // remake
                $this->DB->exec('DROP TABLE '.$this->DB_TableName);
                $res = false;
            }
        }
        if (! $res) {
            try {
                $this->DB->exec('CREATE TABLE '.$this->DB_TableName.'(path text, fname text, dat blob, isdir integer);');
                $this->DB->exec('CREATE UNIQUE INDEX nameidx ON '.$this->DB_TableName.'(path, fname)');
                $this->DB->exec('CREATE INDEX isdiridx ON '.$this->DB_TableName.'(isdir)');
            } catch (PDOException $e) {
                return $this->setError($e->getMessage());
            }
        }

        return true;
    }

    /**
     * DB query and fetchAll.
     *
     * @param string $sql
     * @return bool|array
     */
    private function query($sql)
    {
        if ($sth = $this->DB->query($sql)) {
            $res = $sth->fetchAll(PDO::FETCH_COLUMN);
        } else {
            $res = false;
        }

        return $res;
    }

    /**
     * Get dat(dropbox metadata) from DB.
     *
     * @param string $path
     * @return array dropbox metadata
     */
    private function getDBdat($path)
    {
        if ($res = $this->query('select dat from '.$this->DB_TableName.' where path='.$this->DB->quote(strtolower($this->_dirname($path))).' and fname='.$this->DB->quote(strtolower($this->_basename($path))).' limit 1')) {
            return unserialize($res[0]);
        } else {
            return [];
        }
    }

    /**
     * Update DB dat(dropbox metadata).
     *
     * @param string $path
     * @param array $dat
     * @return bool|array
     */
    private function updateDBdat($path, $dat)
    {
        return $this->query('update '.$this->DB_TableName.' set dat='.$this->DB->quote(serialize($dat))
                .', isdir='.($dat['is_dir'] ? 1 : 0)
                .' where path='.$this->DB->quote(strtolower($this->_dirname($path))).' and fname='.$this->DB->quote(strtolower($this->_basename($path))));
    }

    /**
     * Get HTTP request response header string.
     *
     * @param string $url target URL
     * @return string
     * @author Naoki Sawada
     */
    private function getHttpResponseHeader($url)
    {
        if (function_exists('curl_exec')) {
            $c = curl_init();
            curl_setopt($c, CURLOPT_RETURNTRANSFER, true);
            curl_setopt($c, CURLOPT_CUSTOMREQUEST, 'HEAD');
            curl_setopt($c, CURLOPT_HEADER, 1);
            curl_setopt($c, CURLOPT_NOBODY, true);
            curl_setopt($c, CURLOPT_URL, $url);
            $res = curl_exec($c);
        } else {
            require_once 'HTTP/Request2.php';
            try {
                $request2 = new HTTP_Request2();
                $request2->setConfig([
                    'ssl_verify_peer' => false,
                    'ssl_verify_host' => false,
                ]);
                $request2->setUrl($url);
                $request2->setMethod(HTTP_Request2::METHOD_HEAD);
                $result = $request2->send();
                $res = [];
                $res[] = 'HTTP/'.$result->getVersion().' '.$result->getStatus().' '.$result->getReasonPhrase();
                foreach ($result->getHeader() as $key => $val) {
                    $res[] = $key.': '.$val;
                }
                $res = implode("\r\n", $res);
            } catch (HTTP_Request2_Exception $e) {
                $res = '';
            } catch (Exception $e) {
                $res = '';
            }
        }

        return $res;
    }
} // END class