diff --git a/lib/drivers/webdav/webdav_file_storage.php b/lib/drivers/webdav/webdav_file_storage.php
index e503e3f..6317d69 100644
--- a/lib/drivers/webdav/webdav_file_storage.php
+++ b/lib/drivers/webdav/webdav_file_storage.php
@@ -1,1061 +1,1085 @@
 <?php
 /**
  +--------------------------------------------------------------------------+
  | This file is part of the Kolab File API                                  |
  |                                                                          |
  | Copyright (C) 2012-2015, Kolab Systems AG                                |
  |                                                                          |
  | This program is free software: you can redistribute it and/or modify     |
  | it under the terms of the GNU Affero General Public License as published |
  | by the Free Software Foundation, either version 3 of the License, or     |
  | (at your option) any later version.                                      |
  |                                                                          |
  | This program is distributed in the hope that it will be useful,          |
  | but WITHOUT ANY WARRANTY; without even the implied warranty of           |
  | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the             |
  | GNU Affero General Public License for more details.                      |
  |                                                                          |
  | You should have received a copy of the GNU Affero General Public License |
  | along with this program. If not, see <http://www.gnu.org/licenses/>      |
  +--------------------------------------------------------------------------+
  | Author: Aleksander Machniak <machniak@kolabsys.com>                      |
  +--------------------------------------------------------------------------+
 */
 
 // try SabreDAV installed as described in README
 if (file_exists(__DIR__ . '/../../ext/SabreDAV/vendor/autoload.php')) {
     require __DIR__ . '/../../ext/SabreDAV/vendor/autoload.php';
 }
 // fallback to System-installed package
 else {
     require 'Sabre/autoload.php';
 }
 
 use Sabre\DAV\Client;
 
 class webdav_file_storage implements file_storage
 {
     /**
      * @var rcube
      */
     protected $rc;
 
     /**
      * @var array
      */
     protected $config = array();
 
     /**
      * @var string
      */
     protected $title;
 
     /**
      * @var Sabre\DAV\Client
      */
     protected $client;
 
 
     /**
      * Class constructor
      */
     public function __construct()
     {
         $this->rc = rcube::get_instance();
     }
 
     /**
      * Authenticates a user
      *
      * @param string $username User name
      * @param string $password User password
      *
      * @param bool True on success, False on failure
      */
     public function authenticate($username, $password)
     {
         $settings = array(
             'baseUri'  => $this->config['baseuri'],
             'userName' => $username,
             'password' => $password,
             'authType' => Client::AUTH_BASIC,
         );
 
         $client = new Client($settings);
 
         try {
             $client->propfind('', array());
         }
         catch (Exception $e) {
             return false;
         }
 
         if ($this->title) {
             $_SESSION[$this->title . '_webdav_user']  = $username;
             $_SESSION[$this->title . '_webdav_pass']  = $this->rc->encrypt($password);
             $this->client = $client;
         }
 
         return true;
     }
 
     /**
      * Get password and name of authenticated user
      *
      * @return array Authenticated user data
      */
     public function auth_info()
     {
         return array(
             'username' => $this->config['username'],
             'password' => $this->config['password'],
         );
     }
 
     /**
      * Configures environment
      *
      * @param array  $config Configuration
      * @param string $title  Source identifier
      */
     public function configure($config, $title = null)
     {
         if (!empty($config['host'])) {
             $config['baseuri'] = $config['host'];
         }
 
         $this->config = array_merge($this->config, $config);
         $this->title  = $title;
     }
 
     /**
      * Initializes WebDAV client
      */
     protected function init()
     {
         if ($this->client !== null) {
             return true;
         }
 
         // Load configuration for main driver
         $config['baseuri'] = $this->rc->config->get('fileapi_webdav_baseuri');
 
         if (!empty($config['baseuri'])) {
             $config['username'] = $_SESSION['username'];
             $config['password'] = $this->rc->decrypt($_SESSION['password']);
         }
 
         $this->config = array_merge($config, $this->config);
 
         // Use session username if not set in configuration
         if (!isset($this->config['username'])) {
             $this->config['username'] = $_SESSION[$this->title . '_webdav_user'];
         }
         if (!isset($this->config['password'])) {
             $this->config['password'] = $this->rc->decrypt($_SESSION[$this->title . '_webdav_pass']);
         }
 
         if (empty($this->config['baseuri'])) {
             throw new Exception("Missing base URI of WebDAV server", file_storage::ERROR_NOAUTH);
         }
 
         $this->client = new Client(array(
             'baseUri'  => $this->config['baseuri'],
             'userName' => $this->config['username'],
             'password' => $this->config['password'],
             'authType' => Client::AUTH_BASIC,
         ));
     }
 
     /**
      * Returns current instance title
      *
      * @return string Instance title (mount point)
      */
     public function title()
     {
         return $this->title;
     }
 
     /**
      * Storage driver capabilities
      *
      * @return array List of capabilities
      */
     public function capabilities()
     {
         // find max filesize value
         $max_filesize = parse_bytes(ini_get('upload_max_filesize'));
         $max_postsize = parse_bytes(ini_get('post_max_size'));
         if ($max_postsize && $max_postsize < $max_filesize) {
             $max_filesize = $max_postsize;
         }
 
         return array(
             file_storage::CAPS_MAX_UPLOAD => $max_filesize,
             file_storage::CAPS_QUOTA      => true,
             file_storage::CAPS_LOCKS      => true, //TODO: Implement WebDAV locks
         );
     }
 
     /**
      * Save configuration of external driver (mount point)
      *
      * @param array $driver Driver data
      *
      * @throws Exception
      */
     public function driver_create($driver)
     {
         throw new Exception("Not implemented", file_storage::ERROR_UNSUPPORTED);
     }
 
     /**
      * Delete configuration of external driver (mount point)
      *
      * @param string $name Driver instance name
      *
      * @throws Exception
      */
     public function driver_delete($name)
     {
         throw new Exception("Not implemented", file_storage::ERROR_UNSUPPORTED);
     }
 
     /**
      * Return list of registered drivers (mount points)
      *
      * @return array List of drivers data
      * @throws Exception
      */
     public function driver_list()
     {
         return array();
         //TODO: Stub. Not implemented.
     }
 
     /**
      * Update configuration of external driver (mount point)
      *
      * @param string $title  Driver instance title
      * @param array  $driver Driver data
      *
      * @throws Exception
      */
     public function driver_update($title, $driver)
     {
         throw new Exception("Not implemented", file_storage::ERROR_UNSUPPORTED);
     }
 
     /**
      * Returns metadata of the driver
      *
      * @return array Driver meta data (image, name, form)
      */
     public function driver_metadata()
     {
         $image_content = file_get_contents(__DIR__ . '/webdav.png');
 
         $metadata = array(
             'image' => 'data:image/png;base64,' . base64_encode($image_content),
             'name'  => 'WebDAV',
             'ref'   => 'http://www.webdav.org/',
             'description' => 'WebDAV client',
             'form'  => array(
                 'baseuri'  => 'baseuri',
                 'username' => 'username',
                 'password' => 'password',
             ),
         );
 
         // these are returned when authentication on folders list fails
         if ($this->config['username']) {
             $metadata['form_values'] = array(
                 'baseuri'  => $this->config['baseuri'],
                 'username' => $this->config['username'],
             );
         }
 
         return $metadata;
     }
 
     /**
      * Validate metadata (config) of the driver
      *
      * @param array $metadata Driver metadata
      *
      * @return array Driver meta data to be stored in configuration
      * @throws Exception
      */
     public function driver_validate($metadata)
     {
         if (!is_string($metadata['username']) || !strlen($metadata['username'])) {
             throw new Exception("Missing user name.", file_storage::ERROR);
         }
 
         if (!is_string($metadata['password']) || !strlen($metadata['password'])) {
             throw new Exception("Missing user password.", file_storage::ERROR);
         }
 
         if (!is_string($metadata['baseuri']) || !strlen($metadata['baseuri'])) {
             throw new Exception("Missing base URL.", file_storage::ERROR);
         }
 
         // Ensure baseUri ends with a slash
         $base_uri = $metadata['baseuri'];
         if (substr($base_uri, -1) != '/') {
             $base_uri .= '/';
         }
 
         $this->config['baseuri'] = $base_uri;
 
         if (!$this->authenticate($metadata['username'], $metadata['password'])) {
             throw new Exception("Unable to authenticate user", file_storage::ERROR_NOAUTH);
         }
 
         return array(
             'host'     => $base_uri,
             'port'     => 0,
             'username' => $metadata['username'],
             'password' => $metadata['password'],
         );
     }
 
     /**
      * Create a file.
      *
      * @param string $file_name Name of a file (with folder path)
      * @param array  $file      File data (path, type)
      *
      * @throws Exception
      */
     public function file_create($file_name, $file)
     {
         $this->init();
 
         if ($file['path']) {
             $data = fopen($file['path'], 'r');
         }
         else {
             // Resource or data
             $data = $file['content'];
         }
 
+        if (is_resource($data)) {
+            // Need to tell Curl the attachments size, so it properly
+            // sets Content-Length header, that is required in PUT
+            // request by some webdav servers (#2978)
+            $stat = fstat($data);
+            $this->client->addCurlSetting(CURLOPT_INFILESIZE, $stat['size']);
+        }
+
         $file_name = $this->encode_path($file_name);
         $response  = $this->client->request('PUT', $file_name, $data);
 
+        if ($file['path']) {
+            fclose($data);
+        }
+
         if ($response['statusCode'] != 201) {
             throw new Exception("Storage error. " . $response['body'], file_storage::ERROR);
         }
     }
 
     /**
      * Update a file.
      *
      * @param string $file_name Name of a file (with folder path)
      * @param array  $file      File data (path, type)
      *
      * @throws Exception
      */
     public function file_update($file_name, $file)
     {
         $this->init();
 
         if ($file['path']) {
             $data = fopen($file['path'], 'r');
         }
         else {
             //Resource or data
             $data = $file['content'];
         }
 
+        if (is_resource($data)) {
+            // Need to tell Curl the attachment size, so it properly
+            // sets Content-Length header, that is required in PUT
+            // request by some webdav servers (#2978)
+            $stat = fstat($data);
+            $this->client->addCurlSetting(CURLOPT_INFILESIZE, $stat['size']);
+        }
+
         $file_name = $this->encode_path($file_name);
         $response  = $this->client->request('PUT', $file_name, $data);
 
+        if ($file['path']) {
+            fclose($data);
+        }
+
         if ($response['statusCode'] != 204) {
             throw new Exception("Storage error. " . $response['body'], file_storage::ERROR);
         }
     }
 
     /**
      * Delete a file.
      *
      * @param string $file_name Name of a file (with folder path)
      *
      * @throws Exception
      */
     public function file_delete($file_name)
     {
         $this->init();
 
         $file_name = $this->encode_path($file_name);
         $response  = $this->client->request('DELETE', $file_name);
 
         if ($response['statusCode'] != 204) {
             throw new Exception("Storage error: " . $response['body'], file_storage::ERROR);
         }
     }
 
     /**
      * Return file body.
      *
      * @param string   $file_name Name of a file (with folder path)
      * @param array    $params    Parameters (force-download)
      * @param resource $fp        Print to file pointer instead (send no headers)
      *
      * @throws Exception
      */
     public function file_get($file_name, $params = array(), $fp = null)
     {
         $this->init();
 
         // @TODO: Write directly to $fp
 
         $file_name = $this->encode_path($file_name);
         $response  = $this->client->request($params['head'] ? 'HEAD' : 'GET', $file_name);
 
         if ($response['statusCode'] != 200) {
             throw new Exception("Storage error. File not found.", file_storage::ERROR);
         }
 
         // Sometimes Content-Length is an array here (T3757)
         $size = $response['headers']['content-length'];
         if (is_array($size)) {
             $size = $size[0];
         }
 
         // write to file pointer, send no headers
         if ($fp) {
             if ($size) {
                 fwrite($fp, $response['body']);
             }
             return;
         }
 
         if (!empty($params['force-download'])) {
             $disposition = 'attachment';
             header("Content-Type: application/octet-stream");
 // @TODO
 //            if ($browser->ie)
 //                header("Content-Type: application/force-download");
         }
         else {
             $mimetype = file_utils::real_mimetype($params['force-type'] ? $params['force-type'] : $response['headers']['content-type']);
             $disposition = 'inline';
 
             header("Content-Transfer-Encoding: binary");
             header("Content-Type: $mimetype");
         }
 
         $filename = addcslashes(end(explode('/', $file_name)), '"');
 
         // Workaround for nasty IE bug (#1488844)
         // If Content-Disposition header contains string "attachment" e.g. in filename
         // IE handles data as attachment not inline
 /*
 @TODO
         if ($disposition == 'inline' && $browser->ie && $browser->ver < 9) {
             $filename = str_ireplace('attachment', 'attach', $filename);
         }
 */
         header("Content-Length: " . $size);
         header("Content-Disposition: $disposition; filename=\"$filename\"");
 
         if ($size && empty($params['head'])) {
             echo $response['body'];
         }
     }
 
     /**
      * Returns file metadata.
      *
      * @param string $file_name Name of a file (with folder path)
      *
      * @throws Exception
      */
     public function file_info($file_name)
     {
         $this->init();
 
         try {
             $props = $this->client->propfind($this->encode_path($file_name), array(
                     '{DAV:}resourcetype',
                     '{DAV:}getcontentlength',
                     '{DAV:}getcontenttype',
                     '{DAV:}getlastmodified',
                     '{DAV:}creationdate'
                 ), 0);
         }
         catch (Exception $e) {
             throw new Exception("Storage error. File not found.", file_storage::ERROR);
         }
 
         $mtime = new DateTime($props['{DAV:}getlastmodified']);
         $ctime = new DateTime($props['{DAV:}creationdate']);
 
         return array (
             'name'     => end(explode('/', $file_name)),
             'size'     => (int) $props['{DAV:}getcontentlength'],
             'type'     => (string) $props['{DAV:}getcontenttype'],
             'mtime'    => file_utils::date_format($mtime, $this->config['date_format'], $this->config['timezone']),
             'ctime'    => file_utils::date_format($ctime, $this->config['date_format'], $this->config['timezone']),
             'modified' => $mtime ? $mtime->format('U') : 0,
             'created'  => $ctime ? $ctime->format('U') : 0,
         );
     }
 
     /**
      * List files in a folder.
      *
      * @param string $folder_name Name of a folder with full path
      * @param array  $params      List parameters ('sort', 'reverse', 'search', 'prefix')
      *
      * @return array List of files (file properties array indexed by filename)
      * @throws Exception
      */
     public function file_list($folder_name, $params = array())
     {
         $this->init();
 
         if (!empty($params['search'])) {
             foreach ($params['search'] as $idx => $value) {
                 switch ($idx) {
                 case 'name':
                     $params['search']['name'] = mb_strtoupper($value);
                     break;
 
                 case 'class':
                     $params['search']['class'] = file_utils::class2mimetypes($params['search']['class']);
                     break;
                 }
             }
         }
 
         try {
             $items = $this->client->propfind($this->encode_path($folder_name), array(
                     '{DAV:}resourcetype',
                     '{DAV:}getcontentlength',
                     '{DAV:}getcontenttype',
                     '{DAV:}getlastmodified',
                     '{DAV:}creationdate'
                 ), 1);
         }
         catch (Exception $e) {
             throw new Exception("Storage error. Folder not found.", file_storage::ERROR);
         }
 
         $result = array();
 
         foreach ($items as $file => $props) {
             //Skip directories
             $is_dir = in_array('{DAV:}collection', $props['{DAV:}resourcetype']->resourceType);
             if ($is_dir) {
                 continue;
             }
 
             $mtime = new DateTime($props['{DAV:}getlastmodified']);
             $ctime = new DateTime($props['{DAV:}creationdate']);
             $ctype = (string) $props['{DAV:}getcontenttype'];
 
             $path  = $this->get_full_url($file);
             $path  = $this->decode_path($path);
             $fname = end(explode('/', $path));
 
             if (!empty($params['search'])) {
                 foreach ($params['search'] as $idx => $value) {
                     switch ($idx) {
                     case 'name':
                         if (stripos(mb_strtoupper($fname), $value) === false) {
                             continue 3; // skip the file
                         }
                         break;
 
                     case 'class':
                         foreach ($value as $type) {
                             if (stripos($ctype, $type) !== false) {
                                 continue 3;
                             }
                         }
                         continue 3; // skip the file
                         break;
                     }
                 }
             }
 
             $result[$path] = array(
                 'name'     => $fname,
                 'size'     => (int) $props['{DAV:}getcontentlength'],
                 'type'     => $ctype,
                 'mtime'    => file_utils::date_format($mtime, $this->config['date_format'], $this->config['timezone']),
                 'ctime'    => file_utils::date_format($ctime, $this->config['date_format'], $this->config['timezone']),
                 'modified' => $mtime ? $mtime->format('U') : 0,
                 'created'  => $ctime ? $ctime->format('U') : 0,
             );
         }
 
         // @TODO: pagination
 
         // Sorting
         $sort  = !empty($params['sort']) ? $params['sort'] : 'name';
         $index = array();
 
         if ($sort == 'mtime') {
             $sort = 'modified';
         }
 
         if (in_array($sort, array('name', 'size', 'modified'))) {
             foreach ($result as $key => $val) {
                 $index[$key] = $val[$sort];
             }
             array_multisort($index, SORT_ASC, SORT_NUMERIC, $result);
         }
 
         if ($params['reverse']) {
             $result = array_reverse($result, true);
         }
 
         return $result;
     }
 
     /**
      * Copy a file.
      *
      * @param string $file_name Name of a file (with folder path)
      * @param string $new_name  New name of a file (with folder path)
      *
      * @throws Exception
      */
     public function file_copy($file_name, $new_name)
     {
         $this->init();
 
         $request   =  array('Destination' => $this->config['baseuri'] . '/' . rawurlencode($new_name));
         $file_name = $this->encode_path($file_name);
         $response  = $this->client->request('COPY', $file_name, null, $request);
 
         if ($response['statusCode'] != 201) {
             throw new Exception("Storage error: " . $response['body'], file_storage::ERROR);
         }
     }
 
     /**
      * Move (or rename) a file.
      *
      * @param string $file_name Name of a file (with folder path)
      * @param string $new_name  New name of a file (with folder path)
      *
      * @throws Exception
      */
     public function file_move($file_name, $new_name)
     {
         $this->init();
 
         $request   = array('Destination' => $this->config['baseuri'] . '/' . rawurlencode($new_name));
         $file_name = $this->encode_path($file_name);
         $response  = $this->client->request('MOVE', $file_name, null, $request);
 
         if ($response['statusCode'] != 201) {
             throw new Exception("Storage error: " . $response['body'], file_storage::ERROR);
         }
     }
 
     /**
      * Create a folder.
      *
      * @param string $folder_name Name of a folder with full path
      *
      * @throws Exception on error
      */
     public function folder_create($folder_name)
     {
         $this->init();
 
         $folder_name = $this->encode_path($folder_name);
         $response    = $this->client->request('MKCOL', $folder_name);
 
         if ($response['statusCode'] != 201) {
             throw new Exception("Storage error: " . $response['body'], file_storage::ERROR);
         }
     }
 
     /**
      * Delete a folder.
      *
      * @param string $folder_name Name of a folder with full path
      *
      * @throws Exception on error
      */
     public function folder_delete($folder_name)
     {
         $this->init();
 
         $folder_name = $this->encode_path($folder_name);
         $response    = $this->client->request('DELETE', $folder_name);
 
         if ($response['statusCode'] != 204) {
             throw new Exception("Storage error: " . $response['body'], file_storage::ERROR);
         }
     }
 
     /**
      * Move/Rename a folder.
      *
      * @param string $folder_name Name of a folder with full path
      * @param string $new_name    New name of a folder with full path
      *
      * @throws Exception on error
      */
     public function folder_move($folder_name, $new_name)
     {
         $this->init();
 
         $request     = array('Destination' => $this->config['baseuri'] . '/' . rawurlencode($new_name));
         $folder_name = $this->encode_path($folder_name);
         $response    = $this->client->request('MOVE', $folder_name, null, $request);
 
         if ($response['statusCode'] != 201) {
             throw new Exception("Storage error: " . $response['body'], file_storage::ERROR);
         }
     }
 
     /**
      * Subscribe a folder.
      *
      * @param string $folder_name Name of a folder with full path
      *
      * @throws Exception
      */
     public function folder_subscribe($folder_name)
     {
         throw new Exception("Not implemented", file_storage::ERROR_UNSUPPORTED);
     }
 
     /**
      * Unsubscribe a folder.
      *
      * @param string $folder_name Name of a folder with full path
      *
      * @throws Exception
      */
     public function folder_unsubscribe($folder_name)
     {
         throw new Exception("Not implemented", file_storage::ERROR_UNSUPPORTED);
     }
 
     /**
      * Returns list of folders.
      *
      * @param array $params List parameters ('type', 'search')
      *
      * @return array List of folders
      * @throws Exception
      */
     public function folder_list($params = array())
     {
         $this->init();
 
         try {
             $items = $this->client->propfind('', array(
                 '{DAV:}resourcetype',
             ), 'infinity');
 
             // TODO: Replace infinity by recursion
             // Many servers just do not support 'Depth: infinity' for security reasons
             // E.g. SabreDAV has this optional and disabled by default
         }
         catch (Exception $e) {
             throw new Exception("User credentials not provided", file_storage::ERROR_NOAUTH);
         }
 
         $result = array();
 
         foreach ($items as $file => $props) {
             // Skip files
             $is_dir = in_array('{DAV:}collection', $props['{DAV:}resourcetype']->resourceType);
             if (!$is_dir) {
                 continue;
             }
 
             $path = $this->get_relative_url($file);
             $path = $this->decode_path($path);
 
             if ($path !== '') {
                 $result[] = $path;
             }
         }
 
         // ensure sorted folders
         usort($result, array('file_utils', 'sort_folder_comparator'));
 
         // In extended format we return array of arrays
         if (!empty($params['extended'])) {
             foreach ($result as $idx => $folder) {
                 $item = array('folder' => $folder);
                 $result[$idx] = $item;
             }
         }
 
         return $result;
     }
 
     /**
      * Check folder rights.
      *
      * @param string $folder_name Name of a folder with full path
      *
      * @return int Folder rights (sum of file_storage::ACL_*)
      */
     public function folder_rights($folder_name)
     {
         // @TODO
         return file_storage::ACL_READ | file_storage::ACL_WRITE;
     }
 
     /**
      * Returns a list of locks
      *
      * This method should return all the locks for a particular URI, including
      * locks that might be set on a parent URI.
      *
      * If child_locks is set to true, this method should also look for
      * any locks in the subtree of the URI for locks.
      *
      * @param string $path        File/folder path
      * @param bool   $child_locks Enables subtree checks
      *
      * @return array List of locks
      * @throws Exception
      */
     public function lock_list($path, $child_locks = false)
     {
         $this->init_lock_db();
 
         // convert path into global URI
         $uri = $this->path2uri($path);
 
         // get locks list
         $list = $this->lock_db->lock_list($uri, $child_locks);
 
         // convert back global URIs into paths
         foreach ($list as $idx => $lock) {
             $list[$idx]['uri'] = $this->uri2path($lock['uri']);
         }
 
         return $list;
     }
 
     /**
      * Locks a URI
      *
      * @param string $path File/folder path
      * @param array  $lock Lock data
      *                     - depth: 0/'infinite'
      *                     - scope: 'shared'/'exclusive'
      *                     - owner: string
      *                     - token: string
      *                     - timeout: int
      *
      * @throws Exception
      */
     public function lock($path, $lock)
     {
         $this->init_lock_db();
 
         // convert path into global URI
         $uri = $this->path2uri($path);
 
         if (!$this->lock_db->lock($uri, $lock)) {
             throw new Exception("Database error. Unable to create a lock.", file_storage::ERROR);
         }
     }
 
     /**
      * Removes a lock from a URI
      *
      * @param string $path File/folder path
      * @param array  $lock Lock data
      *
      * @throws Exception
      */
     public function unlock($path, $lock)
     {
         $this->init_lock_db();
 
         // convert path into global URI
         $uri = $this->path2uri($path);
 
         if (!$this->lock_db->unlock($uri, $lock)) {
             throw new Exception("Database error. Unable to remove a lock.", file_storage::ERROR);
         }
     }
 
     /**
      * Return disk quota information for specified folder.
      *
      * @param string $folder_name Name of a folder with full path
      *
      * @return array Quota
      * @throws Exception
      */
     public function quota($folder)
     {
         $this->init();
 
         $props = $this->client->propfind($this->encode_path($folder), array(
             '{DAV:}quota-available-bytes',
             '{DAV:}quota-used-bytes',
         ), 0);
 
         $used      = $props['{DAV:}quota-used-bytes'];
         $available = $props['{DAV:}quota-available-bytes'];
 
         return array(
             // expected values in kB
             'total' => ($used + $available) / 1024,
             'used'  => $used / 1024,
         );
     }
 
     /**
      * Sharing interface
      *
      * @param string $folder_name Name of a folder with full path
      * @param int    $mode        Sharing action mode
      * @param array  $args        POST/GET parameters
      *
      * @return mixed Sharing response
      * @throws Exception
      */
     public function sharing($folder, $mode, $args = array())
     {
         // TODO
         throw new Exception("Search not implemented", file_storage::ERROR_UNSUPPORTED);
     }
 
     /**
      * User/group search (autocompletion)
      *
      * @param string $search Search string
      * @param int    $mode   Search mode
      *
      * @return array Users/Groups list
      * @throws Exception
      */
     public function autocomplete($search, $mode)
     {
         // TODO
         throw new Exception("Search not implemented", file_storage::ERROR_UNSUPPORTED);
     }
 
     /**
      * Convert file/folder path into a global URI.
      *
      * @param string $path File/folder path
      *
      * @return string URI
      * @throws Exception
      */
     public function path2uri($path)
     {
         $base = preg_replace('|^[a-zA-Z]+://|', '', $this->config['baseuri']);
 
         return 'webdav://' . rawurlencode($this->config['username']) . '@' . $base
             . '/' . file_utils::encode_path($path);
     }
 
     /**
      * Convert global URI into file/folder path.
      *
      * @param string $uri URI
      *
      * @return string File/folder path
      * @throws Exception
      */
     public function uri2path($uri)
     {
         if (!preg_match('|^webdav://([^@]+)@(.*)$|', $uri, $matches)) {
             throw new Exception("Internal storage error. Unexpected data format.", file_storage::ERROR);
         }
 
         $user = rawurldecode($matches[1]);
         $base = preg_replace('|^[a-zA-Z]+://|', '', $this->config['baseuri']);
         $uri  = $matches[2];
 
         if ($user != $this->config['username'] || strpos($uri, $base) !== 0) {
             throw new Exception("Internal storage error. Unresolvable URI.", file_storage::ERROR);
         }
 
         $uri = substr($matches[2], strlen($base) + 1);
 
         return file_utils::decode_path($uri);
     }
 
     /**
      * Gets the relative URL of a resource
      *
      * @param string $url WebDAV URL
      * @return string Path relative to root (title/.)
      */
     protected function get_relative_url($url)
     {
         $url = $this->client->getAbsoluteUrl($url);
 
         return trim(str_replace($this->config['baseuri'], '', $url), '/');
     }
 
     /**
      * Gets the full URL of a resource
      *
      * @param string $url WebDAV URL
      * @return string Path relative to chwala root
      */
     protected function get_full_url($url)
     {
         if (!empty($this->title)) {
             return $this->title . '/' . $this->get_relative_url($url);
         }
 
         return $this->get_relative_url($url);
     }
 
     /**
      * Encode folder/file names in the path
      * so it can be used as URL
      *
      * @param string $path File/folder path
      *
      * @return string Encoded URL
      */
     protected function encode_path($path)
     {
         $path = explode('/', $path);
         $path = array_map('rawurlencode', $path);
 
         return implode('/', $path);
     }
 
     /**
      * Decode folder/file URL path
      *
      * @param string $path File/folder path
      *
      * @return string Decoded path
      */
     protected function decode_path($path)
     {
         $path = explode('/', $path);
         $path = array_map('rawurldecode', $path);
 
         return implode('/', $path);
     }
 
     /**
      * Initializes file_locks object
      */
     protected function init_lock_db()
     {
         if (!$this->lock_db) {
             $this->lock_db = new file_locks;
         }
     }
 }