una/inc/classes/BxDolStorage.php

<?php defined('BX_DOL') or die('hack attempt');
/**
 * Copyright (c) BoonEx Pty Limited - http://www.boonex.com/
 * CC-BY License - http://creativecommons.org/licenses/by/3.0/
 *
 * @defgroup    DolphinCore Dolphin Core
 * @{
 */

define('BX_DOL_STORAGE_ERR_OK', 0);

// 1-8 are standard upload form errors
/*
UPLOAD_ERR_INI_SIZE
Value: 1; The uploaded file exceeds the upload_max_filesize directive in php.ini.

UPLOAD_ERR_FORM_SIZE
Value: 2; The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form.

UPLOAD_ERR_PARTIAL
Value: 3; The uploaded file was only partially uploaded.

UPLOAD_ERR_NO_FILE
Value: 4; No file was uploaded.

UPLOAD_ERR_NO_TMP_DIR
Value: 6; Missing a temporary folder. Introduced in PHP 4.3.10 and PHP 5.0.3.

UPLOAD_ERR_CANT_WRITE
Value: 7; Failed to write file to disk. Introduced in PHP 5.1.0.

UPLOAD_ERR_EXTENSION
Value: 8; A PHP extension stopped the file upload. PHP does not provide a way to ascertain which extension caused the file upload to stop; examining the list of loaded extensions with phpinfo() may help. Introduced in PHP 5.2.0.
*/

define('BX_DOL_STORAGE_ERR_NO_INPUT_METHOD', 1000); ///< there is such input method available
define('BX_DOL_STORAGE_ERR_NO_FILE', 1001); ///< there is no file to upload
define('BX_DOL_STORAGE_INVALID_FILE', 1002); ///< uploaded file is invalid or hack attempts
define('BX_DOL_STORAGE_ERR_FILE_TOO_BIG', 1003); ///< file is too big
define('BX_DOL_STORAGE_ERR_WRONG_EXT', 1004); ///< wrong file extension
define('BX_DOL_STORAGE_ERR_USER_QUOTA_EXCEEDED', 1005); ///< user quota exceeded
define('BX_DOL_STORAGE_ERR_OBJECT_QUOTA_EXCEEDED', 1006); ///< storage object quota exceeded
define('BX_DOL_STORAGE_ERR_SITE_QUOTA_EXCEEDED', 1007); ///< site quota exceeded
define('BX_DOL_STORAGE_ERR_ENGINE_ADD', 1008); ///< some other error during file adding occured, related to particular storage engine

define('BX_DOL_STORAGE_ERR_FILE_NOT_FOUND', 2001); ///< file not found
define('BX_DOL_STORAGE_ERR_UNLINK', 2002); ///< file deletiotion failed

define('BX_DOL_STORAGE_ERR_DB', 5001); ///< database error
define('BX_DOL_STORAGE_ERR_FILESYSTEM_PERM', 5002); ///< filesystem permissions error
define('BX_DOL_STORAGE_ERR_PERMISSION_DENIED', 5003); ///< permission denied
define('BX_DOL_STORAGE_ERR_ENGINE_GET', 5004); ///< some other error during file getting occured, related to particular storage engine

define('BX_DOL_STORAGE_DEFAULT_MIME_TYPE', 'octet/stream'); ///< default mime type if it is not find by extension

define('BX_DOL_STORAGE_DEFAULT_ICON', 'mime-type-any.png'); ///< default icon if no other icon can be determined by file extension

bx_import('BxDolStorageQuery');

/** 
 * @page objects 
 * @section storage Storage
 * @ref BxDolStorage
 */

/**
 * This class unify storage.
 * As the result there are many advantages:
 * - files can be stored as on localhost as on remote storage, for example Amazon s3
 * - all files are in one place and separated from other files, so the data can be organised more easily, 
 *   for example moved to dedicated disk if there is not enough storage
 * - simplicity of usage, there are hight level classes to handle all necessary operations, including upload and security
 * - quotas settings, so you always control how much space you are going to use
 * - persistent storage; uploaded, but not saved files appear upon page reload or future submission of the same form
 *
 *
 * Usage.
 * 
 * Step 1: 
 * Add record to 'sys_objects_storage' table, like you doing this for Comments or Voting objects:
 * - object - your storage object name, usually it is in the following format - vendor prefix, underscore, module prefix; 
 *   for example for BoonEx Forum module it can be bx_forum.
 * - engine - storage engine, for now the following engines are supported:
 *     1. Local - local storage, by default files are stored in /storage/ subfolder in Dolphin root directory
 *     2. S3 - Amazon S3 storage, files are stored on Amazon S3 storage, you need to point AWS Access Key, AWS Secret Key and AWS Bucket in the settings
 * - params - custom storage engine params as php serialized string
 * - token_life - life of the security token in seconds for private files
 * - cache_control - control browser cache, allow browser to store files in browser's cache for this number of seconds, to disable browser cache, 
 *   or let browser to decide on its own set it to 0(zero)
 * - levels - store files in subfolders, generated from filename; it is useful when there is limit of number of files/folders per directory; 
 *   for example if level is 2 and file name is abc.jpg then the file will be stored in a/b/abc.jpg folder, set to to 0(zero) to disable this feature
 * - table_files - table where file info is stored, please refer to step 2 for more details
 * - ext_mode - file extensions restriction mode:
 *     1. allow-deny - allow only file types in ext_allow field and deny all other file types, ext_deny field is ignored.
 *     2. deny-allow - allow all files except the ones specified in ext_deny field, ext_allow field is ignored.
 * - ext_allow - allowed file extensions, comma separated, it is in effect when ext_mode is allow-deny; example - jpg,gif,png
 * - ext_deny - denied file extensions, comma separated, it is in effect when ext_mode is deny-allow; example - exe,com,bat
 * - quota_size - storage engine quota in bytes, the summary of all uploaded files can not be bigger than this number
 * - current_size - current storage engine usage, the sum of all uploaded file sizes
 * - quota_number - max number of files allowed in this storage engine
 * - current_number - current number of files in this storage engine
 * - max_file_size - max file size for this storage engine, please note that other server settings are used if they are less than this setting option
 * - ts - unix timestamp of the last file upload
 * 
 * 
 * Step 2: 
 * Create table for files.
 *
 * @code
 * CREATE TABLE `my_sample_files` (
 *   `id` int(11) NOT NULL AUTO_INCREMENT,
 *   `profile_id` int(10) unsigned NOT NULL,
 *   `remote_id` varchar(255) NOT NULL,
 *   `path` varchar(255) NOT NULL,
 *   `file_name` varchar(255) NOT NULL,
 *   `mime_type` varchar(128) NOT NULL,
 *   `ext` varchar(32) NOT NULL,
 *   `size` int(11) NOT NULL,
 *   `added` int(11) NOT NULL,
 *   `modified` int(11) NOT NULL,
 *   `private` int(11) NOT NULL,
 *   PRIMARY KEY (`id`),
 *   UNIQUE KEY `remote_id` (`remote_id`)
 * );
 * @endcode
 *
 * You need to enter this table name in 'table_files' field in 'sys_objects_storage' table, mentioned in step 1. 
 * The files will be added to this table automatically, all you need is to save 'id' from this table, so you can refer to the file by the 'id'. 
 * It is not recommended to change this table, it is better to create another table which will be connected with this one by file 'id'.
 * 
 * 
 * Step 3:
 * Handling upload.
 *
 * Sample HTML form:
 *  @code
 * <form enctype="multipart/form-data" method="POST" action="store_file.php">
 *     Choose a file to upload: 
 *     <input name="file" type="file" />
 *     <br />
 *     <input type="submit" name="add" value="Upload File" />
 * </form>
 * @endcode
 *
 * Add server code in sample store_file.php file:
 *
 * @code
 * require_once('./inc/header.inc.php');
 * require_once(BX_DIRECTORY_PATH_INC . "languages.inc.php");
 * require_once(BX_DIRECTORY_PATH_INC . "params.inc.php");
 * require_once(BX_DIRECTORY_PATH_INC . "design.inc.php");
 * 
 * bx_import('BxDolStorage');
 * BxDolStorage::pruning(); // pruning is needed to clear expired security tokens, you can call it on cron when your server is not busy
 * $oStorage = BxDolStorage::getObjectInstance('my_module'); // create storage object instance, 'my_module' is value of 'object' field in 'sys_objects_storage' table
 * 
 * if (isset($_POST['add'])) { // if form is submitted
 *         $iId = $oStorage->storeFileFromForm($_FILES['file'], true, 0); // store file from submitted HTML form, 'file' is input name with field, true means store file as private, 0 is profile id 
 *         if ($iId) { // storeFileFromForm returns file id, not false value means operation is successful.
 *             // save $iId somewhere, so you can refer to the file after 
 *             $iCount = $oStorage->afterUploadCleanup($iId, $iProfileId); // since we saved $iId, we remove it from the orphans list, so it will not appear on the form next time (persistent storage) 
 *             echo "uploaded file id: " . $iId . "(deleted orphans:" . $iCount . ")";
 *         } else {
 *             // something went wrong - print the error 
 *             echo "error uploading file: " . $oStorage->getErrorString() 
 *         }
 * }
 * @endcode
 *
 * Please refer to the functions definition for more additional description of functions params. 
 * 
 *  
 * Step 4:
 * Displaying the file.
 * 
 * Use the following code to retrieve saved file. Remember you saved filed id somewhere in the previous step. 
 * Lets assume that the uploaded file is image, then we can show it using the following code:
 * 
 * @code
 * require_once('./inc/header.inc.php');
 * require_once(BX_DIRECTORY_PATH_INC . "languages.inc.php");
 * require_once(BX_DIRECTORY_PATH_INC . "params.inc.php");
 * require_once(BX_DIRECTORY_PATH_INC . "design.inc.php");
 * 
 * bx_import('BxDolStorage');
 * $oStorage = BxDolStorage::getObjectInstance('my_module'); 
 * 
 * $iId = 1234; // since you've saved it somewhere in the previous step, you can retrieve it here 
 * 
 * echo "Uploaded image: <img src="' . $oStorage->getFileUrlById($iId) . '" />;";
 * @endcode
 * 
 * It will show the file, regardless if it is private or public. 
 * You need to control it by yourself who will view the file. 
 * The difference in viewing private files is that link to the file is expiring after N seconds, 
 * you control this period using 'token_life' field in 'sys_objects_storage' table.
 * 
 */
abstract class BxDolStorage extends BxDol implements iBxDolFactoryObject {

    protected $_aObject; ///< object properties
    protected $_iCacheControl; ///< browser cache in seconds, 0 - disabled
    protected $_aParams; ///< custom params
    protected $_iErrorCode; ///< last error code
    protected $_oDb; ///< database relates function are in this object

    /**
     * constructor
     */
    protected function BxDolStorage($aObject) {
        parent::BxDol();
        $this->_aObject = $aObject;
        $this->_iCacheControl = $aObject['cache_control'];
        $this->_aParams = $aObject['params'] ? unserialize($aObject['params']) : '';
        $this->_oDb = new BxDolStorageQuery($aObject);
    }

    /**
     * Get storage object instance by object name
     * @param $sObject object name
     * @return object instance or false on error
     */
    public static function getObjectInstance($sObject) {

        if (isset($GLOBALS['bxDolClasses']['BxDolStorage!'.$sObject]))
            return $GLOBALS['bxDolClasses']['BxDolStorage!'.$sObject];

        $aObject = BxDolStorageQuery::getStorageObject($sObject);
        if (!$aObject || !is_array($aObject))
            return false;

        $sClass = 'BxDolStorage' . $aObject['engine'];
        bx_import($sClass);
        $o = new $sClass($aObject);

        if (!$o->isInstalled() || !$o->isAvailable())
            return false;

        return ($GLOBALS['bxDolClasses']['BxDolStorage!'.$sObject] = $o);
    }

    /**
     * Delete old security tokens from database. 
     * It is alutomatically called upin cron execution, usually once in a day.
     * @return number of deleted records
     */
    public static function pruning() {
        $iDeleted = 0;
        $a = BxDolStorageQuery::getStorageObjects();
        foreach ($a as $aObject) {
            $oDb = new BxDolStorageQuery($aObject);
            $iDeleted += $oDb->prune();
        }
        return $iDeleted;
    }

    /**
     * Is storage engine available?
     * @return boolean
     */
    function isAvailable() {
        return true;
    }

    /**
     * Are required php modules installed for this storage engine ?
     * @return boolean
     */
    public function isInstalled() {
        return true;
    }

    /**
     * Get error code from the last occured error
     * @return error code
     */
    public function getErrorCode() {
        return $this->_iErrorCode;
    }

    /**
     * Get error string from the last occured error
     * @return error string
     */
    public function getErrorString() {
        $a = array (            
            1000 => '_sys_storage_err_no_input_method',
            1001 => '_sys_storage_err_no_file',
            1002 => '_sys_storage_invalid_file',
            1003 => '_sys_storage_err_file_too_big',
            1004 => '_sys_storage_err_wrong_ext',
            1005 => '_sys_storage_err_user_quota_exceeded', 
            1006 => '_sys_storage_err_object_quota_exceeded',
            1007 => '_sys_storage_err_site_quota_exceeded', 
            1008 => '_sys_storage_err_engine_add', 

            2001 => '_sys_storage_err_file_not_found',
            2002 => '_sys_storage_err_unlink', 

            5001 => '_sys_storage_err_db', 
            5002 => '_sys_storage_err_filesystem_perm', 
            5003 => '_sys_storage_err_permission_denied', 
            5004 => '_sys_storage_err_engine_get', 
        );
        return _t($a[$this->_iErrorCode]);
    }


    /**
     * Get max file size allowed for current user, it checks user quota, object quota, site quota and php setting
     * @param $iProfileId profile id to check quota for
     * @return quota size in bytes
     */
    public function getMaxUploadFileSize ($iProfileId) {

        $iMin = PHP_INT_MAX;        

        $aUserQuota = $this->_oDb->getUserQuota($iProfileId);
        if ($aUserQuota['max_file_size'] && $aUserQuota['max_file_size'] < $iMin)
            $iMin = $aUserQuota['max_file_size'];

        $aObjectQuota = $this->_oDb->getStorageObjectQuota();
        if ($aObjectQuota['max_file_size'] && $aObjectQuota['max_file_size'] < $iMin)
            $iMin = $aObjectQuota['max_file_size'];

        // TODO: get and check site quota

        $iUploadMaxFilesize = return_bytes(ini_get('upload_max_filesize'));
        if ($iUploadMaxFilesize && $iUploadMaxFilesize < $iMin)
            $iMin = $iUploadMaxFilesize;

        return $iMin;
    }

    /**
     * Store file in the storage area. It is not recommended to use this function directly, 
     * use other funtions like: storeFileFromForm, storeFileFromXhr, storeFileFromPath
     * @param $sMethod upload method, like regular Form upload, upload from URL, etc
     * @param $aMethodParams upload method params
     * @param $sName file name with extention
     * @param $isPrivate private or public file
     * @param $iProfileId profile id of the upload action performer
     * @param $iContentId content id to associate with ghost file
     * @return id of added file on success, false on error - to get exact error string call getErrorString()
     */
    public function storeFile($sMethod, $aMethodParams, $sName = false, $isPrivate = true, $iProfileId = 0, $iContentId = 0) {

        // setup input source using helper classes, like $_FILES or some URL for example

        $sHelperClass = 'BxDolStorageHelper' . $sMethod;
        if (!class_exists($sHelperClass)) {
            $this->setErrorCode(BX_DOL_STORAGE_ERR_NO_INPUT_METHOD);
            return false;
        }

        $oHelper = new $sHelperClass($aMethodParams);

        // check for errors, like size and extentions checking

        if ($iImmediateError = $oHelper->getImmediateError()) {
            $this->setErrorCode($iImmediateError);
            return false;
        }

        $sExt = $this->getFileExt($oHelper->getName());
        $sMimeType = $this->getMimeTypeByFileName($oHelper->getName());

        if (!$this->isValidExt($sExt)) {
            $this->setErrorCode(BX_DOL_STORAGE_ERR_WRONG_EXT);
            return false;
        }

        // before upload callback + additional checking

        if (!$this->onBeforeFileAdd (array(
            'profile_id' => $iProfileId,
            'content_id' => $iContentId,
            'file_name' => $oHelper->getName(),
            'mime_type' => $sMimeType,
            'ext' => $sExt,
            'size' => $oHelper->getSize(),
            'private' => $isPrivate ? 1 : 0,
        ))) {
            return false;
        }

        // create tmp file        
        
        $sTmpFile = tempnam(realpath(sys_get_temp_dir()), 'bxdol');
        if (!$oHelper->save($sTmpFile)) {
            $this->setErrorCode(BX_DOL_STORAGE_INVALID_FILE);
            return false;
        }

        // store file to storage engine

        $sLocalId = $this->genRandName();
        $sPath = $this->genPath($sLocalId, $this->_aObject['levels']);
        $sRemoteNamePath = $this->genRemoteNamePath ($sPath, $sLocalId, $sExt);

        if (!$this->addFileToEngine($sTmpFile, $sLocalId, $oHelper->getName(), $isPrivate, $iProfileId)) {
            unlink($sTmpFile);
            $this->setErrorCode(BX_DOL_STORAGE_ERR_ENGINE_ADD);
            return false;
        }
        unlink($sTmpFile);

        // add record in db

        $iTime = time();
        $iSize = $oHelper->getSize();        
        $bFileAdded = $this->_oDb->addFile($iProfileId, $sLocalId, $sRemoteNamePath, $oHelper->getName(), $sMimeType, $sExt, $iSize, $iTime, $isPrivate);
        $iId = $this->_oDb->lastId();
        if (!$bFileAdded || !$iId) {        
            $this->deleteFileFromEngine($sPath . $sLocalId, $isPrivate);
            $this->setErrorCode(BX_DOL_STORAGE_ERR_DB);
            return false;
        }
            
        // after upload callback + triggers update
    
        if (!$this->onFileAdded (array(
            'id' => $iId,
            'profile_id' => $iProfileId,
            'content_id' => $iContentId,
            'remote_id' => $sLocalId,
            'path' => $sPath . $sLocalId,
            'file_name' => $oHelper->getName(),
            'mime_type' => $sMimeType,
            'size' => $iSize,
            'private' => $isPrivate ? 1 : 0,
        ))) {
            $this->deleteFileFromEngine($sPath . $sLocalId, $isPrivate);
            $this->_oDb->deleteFile($iId);            
            return false;
        }

        return $iId;
    }

    /**
     * convert default multiple files array into more logical one
     */
    public function convertMultipleFilesArray($aFiles) { 
        
        if (!is_array($aFiles) || !is_array($aFiles['name']))
            return false;
        $aRet = array ();
        foreach ($aFiles['name'] as $i => $sName) {            
            foreach ($aFiles as $sKey => $r) {
                if (!$aFiles['name'][$i])
                    break;
                $aRet[$i][$sKey] = $aFiles[$sKey][$i];
            }            
        }
        return $aRet;    
    }

    /**
     * the same as storeFile, but it tries to do it directly from uploaded file
     */
    public function storeFileFromForm($aFile, $isPrivate = true, $iProfileId = 0, $iContentId = 0) {
        return $this->storeFile('Form', array('file' => $aFile), false, $isPrivate, $iProfileId, $iContentId);
    }

    /**
     * the same as storeFile, but it tries to do it directly from HTML5 file upload method
     */
    public function storeFileFromXhr($sName, $isPrivate = true, $iProfileId = 0, $iContentId = 0) {
        return $this->storeFile('Xhr', array('name' => $sName), false, $isPrivate, $iProfileId, $iContentId);
    }

    /**
     * the same as storeFile, but it tries to do it directly from local file
     */
    public function storeFileFromPath($sPath, $isPrivate = true, $iProfileId = 0, $iContentId = 0) {
        return $this->storeFile('Path', array('path' => $sPath), false, $isPrivate, $iProfileId, $iContentId);
    }

    /**
     * the same as storeFile, but it tries to do it directly from the same or another storage by file id
     * @param $aParams['id'] - file ID in the storage
     * @param $aParams['storage'] - the storage name
     */
    public function storeFileFromStorage($aParams, $isPrivate = true, $iProfileId = 0, $iContentId = 0) {
        if (!isset($aParams['id']) || !(int)$aParams['id'])
            $aParams['id'] = 0;

        if (!isset($aParams['storage']))
            $aParams['storage'] = $this->_aObject['object'];

        return $this->storeFile('Storage', $aParams, false, $isPrivate, $iProfileId, $iContentId = 0);
    }

    /**
     * Delete file by file id.
     */
    public function deleteFile($iFileId, $iProfileId = 0) { 
        
        $aFile = $this->_oDb->getFileById ($iFileId);
        if (!$aFile) {
            $this->setErrorCode(BX_DOL_STORAGE_ERR_FILE_NOT_FOUND);
            return false;
        }

        if (!$this->onBeforeFileDelete ($aFile, $iProfileId)) {
            return false;
        }
    
        if (!$this->deleteFileFromEngine($aFile['path'], $aFile['private'])) { 
            return false;
        }

        if (!$this->_oDb->deleteFile($aFile['id'])) {
            $this->setErrorCode(BX_DOL_STORAGE_ERR_DB);
            return false;
        }

        if (!$this->onFileDeleted ($aFile, $iProfileId)) {
            return false;
        }

        return true;
    }

    /**
     * Set file private or public.
     */
    public function setFilePrivate($iFileId, $isPrivate = true) {
        if (!$this->_oDb->modifyFilePrivate ($iFileId, $isPrivate)) {
            $this->setErrorCode(BX_DOL_STORAGE_ERR_DB);
            return false;
        }
        return true;
    } 

    /**
     * Get file url.
     * @param $iFileId file id
     * @return file url or false on error
     */
    public function getFileUrlById($iFileId) { }

    /**
     * Get file info array by file id.
     * @param $iFileId file id
     * @return array
     */ 
    public function getFile($iFileId) {
        return $this->_oDb->getFileById($iFileId);
    }

    /**
     * check if file is private or public
     * @param $iFileId file id
     * @return boolean
     */
    public function isFilePrivate($iFileId) { 
        $aFile = $this->getFile ($iFileId);
        return $aFile['private'] ? true : false;
    } 

    /**
     * Call this function after saving/associate just uploaded file id, so file is not orphaned/ghost.
     * Ghost files appear on download form automaticaly during next upload, 
     * for example if file was uploaded but was not submitted for some reason.
     * This mechanism ensure that the file is not lost.
     * @param $mixedFileIds array of file ids or just one file id
     * @param $iProfileId profile id
     * @param return number of deleted ghost files
     */
    public function afterUploadCleanup($mixedFileIds, $iProfileId, $iContentId = false) {
        return $this->_oDb->deleteGhosts($mixedFileIds, $iProfileId, $iContentId);
    }

    /**
     * Get ghost/orphaned files for particular user.
     * @param $iProfileId profile id
     * @param $iContentId content id, or false to not consider content id at all
     * @return array of arrays
     */
    public function getGhosts($iProfileId, $iContentId = false) {
        return $this->_oDb->getGhosts($iProfileId, $iContentId);
    }

    /**
     * Update ghosts' content id.
     * @param $mixedFileIds array of file ids or just one file id
     * @param $iProfileId profile id
     * @param $iContentId content id
     * @return true on success or false otherwise
     */
    public function updateGhostsContentId($mixedFileIds, $iProfileId, $iContentId) {
        return $this->_oDb->updateGhostsContentId($mixedFileIds, $iProfileId, $iContentId);
    }

    /**
     * Get files list for particular user.
     * @param $iProfileId profile id
     * @return array of arrays
     */
    public function getFiles($iProfileId) {
        return $this->_oDb->getFiles($iProfileId);
    }    

    public function tmpDebugGetFilesList() { // TODO: remove this function, since it is for debugging purposes only
        $sQuery = "SELECT * FROM `" . $this->_aObject['table_files'] . "`";
        return $this->_oDb->getAll($sQuery);
    }

    /**
     * Get readable representation of restrictions by file extentions.
     * @param $iProfileId profile id
     * @return string
     */
    public function getRestrictionsTextExtensions ($iProfileId) {
        switch ($this->_aObject['ext_mode']) {
            case 'allow-deny':
                if (!$this->_aObject['ext_allow'])
                    return _t('_sys_storage_restriction_ext_all_denied');
                return _t('_sys_storage_restriction_ext_allowed', _t_format_extensions($this->_aObject['ext_allow']));
            case 'deny-allow':
                if (!$this->_aObject['ext_deny'])
                    return _t('_sys_storage_restriction_ext_all_allowed');
                return _t('_sys_storage_restriction_ext_denied', _t_format_extensions($this->_aObject['ext_deny']));
            default:
                return _t('_sys_storage_restriction_ext_all_denied');
        }
    }

    /**
     * Get readable representation of restrictions by file size.
     * @param $iProfileId profile id
     * @return string
     */
    public function getRestrictionsTextFileSize ($iProfileId) {
        return _t('_sys_storage_restriction_size', _t_format_size($this->getMaxUploadFileSize($iProfileId)));
    }

    /**
     * Get readable representation of all restrictions.
     * @param $iProfileId profile id
     * @return array of strings
     */
    public function getRestrictionsTextArray ($iProfileId) {
        $aTypes = array('Extensions', 'FileSize');
        $aRet = array();
        foreach ($aTypes as $sType) {
            $sFunc = 'getRestrictionsText' . $sType;
            $s = $this->$sFunc ($iProfileId);
            if ($s)
                $aRet[] = $s;
        }
        return $aRet;
    }

    /**
     * Reread available mimetypes from particular file. 
     * It clears 'sys_storage_mime_types' table and fill it with data form provided file.
     * The format of file is: mime/type _space_or_tab_ extentions_sperated_by_space.
     * Usually the file is mime.types file from apache or /etc/mime.types from unix systems.
     * @param $sFile file to read mime types from
     * @return false if file was not found or can not be read, string with result on other case - it can contains file markup errors or localized "Success" string if everything went fine. 
     */
    public function reloadMimeTypesFromFile ($sFile) {
        $sResult = '';

        $aIcons = array (
            'mime-type-psd.png' => array('psd'),
            'mime-type-png.png' => array('png'),
            'mime-type-image.png' => 'image/', 
            'mime-type-video.png' => 'video/',
            'mime-type-audio.png' => 'audio/',
            'mime-type-presentation.png' => array('ppt', 'pptx', 'sxi', 'sti', 'odp', 'sdp', 'sdd'),
            'mime-type-spreadsheet.png' => array('xls', 'xlt', 'xlsx', 'sxc', 'stc', 'ods', 'ots', 'sdc', 'csv', 'dif', 'slk', 'pxl'),            
            'mime-type-document.png' => array('doc', 'docx', 'odt', 'ott', 'sxw', 'stw', 'rtf', 'sdw', 'txt', 'pdb', 'psw', 'pdf'),
            'mime-type-vector.png' => array('ac5', 'ac6', 'aff', 'agd1', 'ai', 'ait', 'art', 'awg', 'b2f', 'cag', 'cbd', 'cdl', 'cdr', 'cdr3', 'cdr4', 'cdr5', 'cdr6', 'cdrw', 'cdx', 'cgm', 'cht', 'cil', 'cit', 'cnv', 'csl', 'ctn', 'cv5', 'cvg', 'cvi', 'cvl', 'cvs', 'cvx', 'dcs', 'ddoc', 'ddrw', 'ded', 'design', 'dmw', 'do', 'dpp', 'dpr', 'draw', 'drw', 'dsf', 'dsf', 'dsx', 'dvg', 'dxb', 'emb', 'evf', 'fcd', 'fh', 'fhd', 'fmv', 'fs', 'ft10', 'ft11', 'ft9', 'ft8', 'gem', 'gl2', 'graffle', 'gsd', 'gsd', 'hpg', 'hpgl', 'hpgl2', 'hpl', 'hplj', 'hpp', 'hppcl', 'idw', 'ima', 'macdraw', 'md', 'mgcb', 'mgs', 'mvg', 'nap', 'naplps', 'odg', 'p10', 'pat', 'pct', 'pd', 'pdw', 'pgs', 'pic', 'pif', 'pix', 'plo', 'plot', 'plt', 'ps', 'psid', 'pws', 'rdl', 's57', 'sdw', 'sif', 'sk2', 'slddwg', 'sp', 'spa', 'svf', 'svg', 'svgb', 'svgz', 'sxd', 'tdr', 'tlc', 'tng', 'vbr', 'vec', 'vect', 'veh', 'vml', 'vss', 'web', 'web', 'web', 'yal'),
            'mime-type-archive.png' => array('7z', '7zip', 'aar', 'ace', 'alz', 'arj', 'bz2', 'bza', 'bzip2', 'bzp', 'bzp2', 'cab', 'czip', 'gnutar', 'gz', 'gza', 'gzi', 'gzip', 'ha', 'lhz', 'lzma', 'pzip', 'rar', 'roo', 's7z', 'tar', 'tar-gz', 'tar-lzma', 'tar-z', 'taz', 'tbz', 'tbz2', 'tgz', 'tz', 'z', 'zip', 'zipx', 'zix', 'zoo'), 
        );

        $f = fopen ($sFile, 'r');
        if (!$f)
            return false;

        $this->_oDb->clearAllMimeTypes();

        while (!feof($f) && ($s = fgets($f, 4096)) !== false) {
            $s = trim($s);
            if (!$s || '#' == $s[0])
                continue;

            $a = preg_split ("/[\s\\b]+/", $s, 2);
            if (!isset($a[0]) || !isset($a[1]))
                continue;

            $sMimeType = $a[0];
            $aExts = preg_split ("/[\s]+/", $a[1]);
            
            foreach ($aExts as $sExt) {
                $sIcon = '';
                foreach ($aIcons as $sIc => $if) {
                    if (!(is_array($if) && in_array($sExt, $if)) && !(is_string($if) && 0 == strncmp($if, $sMimeType, strlen($if))))
                        continue;
                    $sIcon = $sIc;
                    break;
                }

                if (!$this->_oDb->addMimeType($sMimeType, $sExt, $sIcon))
                    $sResult .= _t('_Error') . ': ' . $sMimeType . "\t" . $sExt . "\n";
            }
        }
        
        fclose($f);
    
        if (!$sResult)
            $sResult = _t('_Success');

        return $sResult;
    }

    /**
     * Get file extension by file name.
     * @param $sFileName file name
     * @return file extention string
     */
    public function getFileExt ($sFileName) {
        return strtolower(pathinfo($sFileName, PATHINFO_EXTENSION));
    }

    /**
     * Get file title by file name, actually file title is file name without extension.
     * @param $sFileName file name
     * @return file title string
     */
    public function getFileTitle ($sFileName) {
        return pathinfo($sFileName, PATHINFO_FILENAME);
    }

    /**
     * Get file mime/type by file name.
     * @param $sFileName file name
     * @return file mime type string
     */
    public function getMimeTypeByFileName ($sFileName) {
        $sExt = $this->getFileExt($sFileName);
        $sMimeType = $this->_oDb->getMimeTypeByExt($sExt);
        if (!$sMimeType)
            $sMimeType = BX_DOL_STORAGE_DEFAULT_MIME_TYPE;
        return $sMimeType;
    }

    /**
     * Get file icon by file name. 
     * File icon is just icon filename without patch or URL. 
     * File icons must be located in images/icons directory in your template subfolder.
     * @param $sFileName file name
     * @return file icon string
     */
    public function getIconNameByFileName ($sFileName) {
        $sExt = $this->getFileExt($sFileName);
        $sIcon = $this->_oDb->getIconByExt($sExt);
        if (!$sIcon)
            $sIcon = BX_DOL_STORAGE_DEFAULT_ICON;
        return $sIcon;
    }

    // ------------ internal functions - events

    protected function onBeforeFileAdd ($aFileInfo) {

        if ($aFileInfo['size'] > $this->getMaxUploadFileSize($aFileInfo['profile_id'])) {
            $this->setErrorCode(BX_DOL_STORAGE_ERR_FILE_TOO_BIG);
            return false;
        }

        // TODO: check site quota - BX_DOL_STORAGE_ERR_SITE_QUOTA_EXCEEDED

        $aObjectQuota = $this->_oDb->getStorageObjectQuota();
        if (
            ($aObjectQuota['quota_size'] && ($aObjectQuota['current_size'] + $aFileInfo['size'] > $aObjectQuota['quota_size'])) 
            || 
            ($aObjectQuota['quota_number'] && ($aObjectQuota['current_number'] + 1 > $aObjectQuota['quota_number']))
            ) {
            $this->setErrorCode(BX_DOL_STORAGE_ERR_OBJECT_QUOTA_EXCEEDED);
            return false;
        }

        $aUserQuota = $this->_oDb->getUserQuota($aFileInfo['profile_id']);
        if (
            ($aUserQuota['quota_size'] && ($aUserQuota['current_size'] + $aFileInfo['size'] > $aUserQuota['quota_size'])) 
            || 
            ($aUserQuota['quota_number'] && ($aUserQuota['current_number'] + 1 > $aUserQuota['quota_number']))
            ) {
            $this->setErrorCode(BX_DOL_STORAGE_ERR_USER_QUOTA_EXCEEDED);
            return false;
        }
        
        $this->setErrorCode(BX_DOL_STORAGE_ERR_OK);

        $bRet = true;
        bx_alert($this->_aObject['object'], 'before_file_add', 0, $aFileInfo['profile_id'], array('file_info' => $aFileInfo, 'return_value' => &$bRet));
        return $bRet;
    }

    protected function onFileAdded ($aFileInfo) {

        // TODO: update site quota - BX_DOL_STORAGE_ERR_SITE_QUOTA_EXCEEDED

        if (!$this->_oDb->updateStorageObjectQuota($aFileInfo['size'], 1)) {
            $this->setErrorCode(BX_DOL_STORAGE_ERR_DB);
            return false;
        }

        if (!$this->_oDb->updateUserQuota($aFileInfo['profile_id'], $aFileInfo['size'], 1)) {
            $this->setErrorCode(BX_DOL_STORAGE_ERR_DB);
            return false;
        }

        if (!$this->insertGhost ($aFileInfo['id'], $aFileInfo['profile_id'], $aFileInfo['content_id'])) {
            $this->setErrorCode(BX_DOL_STORAGE_ERR_DB);
            return false;
        }

        $this->setErrorCode(BX_DOL_STORAGE_ERR_OK);

        $bRet = true;        
        bx_alert($this->_aObject['object'], 'file_added', $aFileInfo['id'], $aFileInfo['profile_id'], array('file_info' => $aFileInfo, 'return_value' => &$bRet));
        return $bRet;
    }

    function insertGhost($iFileId, $iProfileId, $iContentId = 0) {
        return $this->_oDb->insertGhosts ($iFileId, $iProfileId, $iContentId);
    }

    function onBeforeFileDelete ($aFileInfo, $iProfileId) {

        $this->setErrorCode(BX_DOL_STORAGE_ERR_OK);

        $bRet = true;
        bx_alert($this->_aObject['object'], 'before_file_delete', $aFileInfo['id'], $iProfileId, array('file_info' => $aFileInfo, 'return_value' => &$bRet));
        return $bRet;
    }

    function onFileDeleted ($aFileInfo, $iProfileId) {

        // TODO: update site quota

        if (!$this->_oDb->updateStorageObjectQuota(-$aFileInfo['size'], -1)) {
            $this->setErrorCode(BX_DOL_STORAGE_ERR_DB);
            return false;
        }

        if (!$this->_oDb->updateUserQuota($aFileInfo['profile_id'], -$aFileInfo['size'], -1)) {
            $this->setErrorCode(BX_DOL_STORAGE_ERR_DB);
            return false;
        }

        $this->setErrorCode(BX_DOL_STORAGE_ERR_OK);

        $bRet = true;
        bx_alert($this->_aObject['object'], 'file_deleted', $aFileInfo['id'], $iProfileId, array('file_info' => $aFileInfo, 'return_value' => &$bRet));
        return $bRet;
    }

    // ------------ internal functions

    protected function setErrorCode($i) {
        return ($this->_iErrorCode = $i);
    }

    protected function genRandName($isCheckForUniq = true) {
        $sRandName = genRndPwd(32, false);
        if ($isCheckForUniq) {
            $iTries = 10;
            do {              
                $aFile = $this->_oDb->getFileByRemoteId($sRandName);
                $bExist = is_array($aFile) && $aFile;
            } while (--$iTries && $bExist);
        }
        return $sRandName;
    }

    protected function genPath($s, $iLevels) {
        $sRet = '';
        $i = 1;
        while ($iLevels-- > 0)
            $sRet .= substr($s, 0, $i++) . '/';
        return $sRet;
    }

    protected function genRemoteNamePath ($sPath, $sLocalId, $sExt) {
        return $sPath . $sLocalId;
    }

    protected function isValidExt ($sExt) {
        switch ($this->_aObject['ext_mode']) {
            case 'allow-deny':
                if ($this->isAllowedExt($sExt))
                    return true;
                return false;
            case 'deny-allow':
                if ($this->isDeniedExt($sExt))
                    return false;
                return true;
            default:
                return false;
        }
    }

    protected function isAllowedExt ($sExt) {
        return $this->isAllowedDeniedExt($sExt, 'ext_allow');
    }

    protected function isDeniedExt ($sExt) {
        return $this->isAllowedDeniedExt($sExt, 'ext_deny');
    }

    protected function isAllowedDeniedExt ($sExt, $sExtMode) {
        if ('' == $this->_aObject[$sExtMode])
            return false;
        if (!is_array($this->_aObject[$sExtMode]))    
            $this->_aObject[$sExtMode] = explode(',', $this->_aObject[$sExtMode]);
        return in_array ($sExt, $this->_aObject[$sExtMode]);
    }

}


/**
 * Handle file uploads via XMLHttpRequest
 */
class BxDolStorageHelperXhr {

    var $sName;

    function BxDolStorageHelperXhr ($aParams) {
        $this->sName = $aParams['name'];
    }

    function getImmediateError() {
        return BX_DOL_STORAGE_ERR_OK;
    }

    function save($path) {    
        $input = fopen("php://input", "r");
        $temp = tmpfile();
        $realSize = stream_copy_to_stream($input, $temp);
        fclose($input);
        
        if (false === $this->getSize() || $realSize != $this->getSize())
            return false;
        
        $target = fopen($path, "w");        
        fseek($temp, 0, SEEK_SET);
        stream_copy_to_stream($temp, $target);
        fclose($target);
        fclose($temp);

        return true;
    }

    function getName() {
        return $this->sName;
    }

    function getSize() {
        if (isset($_SERVER["CONTENT_LENGTH"]))
            return (int)$_SERVER["CONTENT_LENGTH"];            
        else
            return false;
    }   
}

/**
 * Handle file uploads via regular form post (uses the $_FILES array)
 */
class BxDolStorageHelperForm {  

    var $aFile;

    function BxDolStorageHelperForm ($aParams) {
        $this->aFile = $aParams['file'];
    }

    function getImmediateError() {

        if (!$this->aFile['size'] || !$this->aFile['tmp_name'])
            return BX_DOL_STORAGE_ERR_NO_FILE;

        if (UPLOAD_ERR_OK != $this->aFile['error'])
            return (int)$this->aFile['error'];

        return BX_DOL_STORAGE_ERR_OK;
    }

    function save($path) {
        if (!move_uploaded_file($this->aFile['tmp_name'], $path)){
            return false;
        }
        return true;
    }

    function getName() {
        return $this->aFile['name'];
    }

    function getSize() {
        return $this->aFile['size'];
    }
}

/**
 * Store file from local file path 
 */
class BxDolStorageHelperPath { 

    var $sPath;

    function BxDolStorageHelperPath ($aParams) {
        $this->sPath = $aParams['path'];
    }

    function getImmediateError() {

        if (!file_exists($this->sPath))
            return BX_DOL_STORAGE_ERR_NO_FILE;

        return BX_DOL_STORAGE_ERR_OK;
    }

    function save($path) {
        if (!copy($this->sPath, $path)) {
            return false;
        }
        return true;
    }

    function getName() {
        return pathinfo($this->sPath, PATHINFO_BASENAME);
    }

    function getSize() {
        return filesize($this->sPath);
    }
}

/**
 * Handle file uploads from the same or another storage object 
 */
class BxDolStorageHelperStorage {

    var $iFileId;
    var $oStorage;
    var $aFile;

    function BxDolStorageHelperStorage ($aParams) {
        $this->iFileId = $aParams['id'];
        $this->oStorage = BxDolStorage::getObjectInstance($aParams['storage']);

        $this->aFile = false;
        if ($this->oStorage)
            $this->aFile = $this->oStorage->getFile($this->iFileId);
    }

    function getImmediateError() {

        if (!$this->iFileId)
            return BX_DOL_STORAGE_ERR_NO_FILE;
        
        if (!$this->oStorage)
            return BX_DOL_STORAGE_ERR_ENGINE_GET;

        if (!$this->aFile)
            return BX_DOL_STORAGE_ERR_NO_FILE;

        return BX_DOL_STORAGE_ERR_OK;
    }

    function save($path) {
        $s = bx_file_get_contents ($this->oStorage->getFileUrlById($this->iFileId));
        if (!$s)
            return false;

        return file_put_contents($path, $s) ? true : false;
    }

    function getName() {
        return $this->aFile['file_name'];
    }

    function getSize() {
        return $this->aFile['size'];
    }
}

/** @} */