diff --git a/lib/groupofficestorage.php b/lib/groupofficestorage.php
new file mode 100644
index 0000000..86f94ae
--- /dev/null
+++ b/lib/groupofficestorage.php
@@ -0,0 +1,477 @@
+<?php
+
+namespace OC\Files\Storage;
+
+class Groupoffice extends \OC\Files\Storage\Common
+{
+
+    private $groupoffice_data;
+    private $groupoffice_shares = array();
+    private $id;
+
+    public function __construct($arguments)
+    {
+        if (isset($arguments['user'])) {
+            $this->id = 'groupoffice::' . $arguments['user'] . '/';
+            $this->groupoffice_data = \GO::config()->file_storage_path;
+            \GO::session()->setCurrentUser(\GO\Base\Model\User::model()->findSingleByAttribute('username', $arguments['user']));
+
+            $this->groupoffice_shares['ownFolder'] = 'users/' . $arguments['user'];
+            $shares = \GO\Files\Model\Folder::model()->getTopLevelShares(\GO\Base\Db\FindParams::newInstance()->limit(100));
+
+            foreach ($shares as $folder) {
+                $this->groupoffice_shares[$folder->name] = $folder->path;
+            }
+        } else {
+            throw new \Exception('Creating \OC\Files\Storage\Groupoffice storage failed');
+        }
+    }
+
+    public static function setup($options) {
+        if (\OCP\User::isLoggedIn()) {
+            \OC\Files\Filesystem::mount('\OC\Files\Storage\Groupoffice', array('user' => $options['user']),
+                $options['user_dir'] . '/Groupoffice/');
+        }
+    }
+
+    public function getId()
+    {
+        return $this->id;
+    }
+
+    private function is_root_shared_folder($path) {
+        $tmp = explode("/", $path);
+        $basefolder = $tmp[0];
+        unset($tmp[0]);
+        $realfolder = implode("/", $tmp);
+
+        if (array_key_exists($basefolder,$this->groupoffice_shares) && $realfolder == '')
+            return true;
+        else
+            return false;
+    }
+
+    public function isSharable($path)
+    {
+        return false;
+    }
+
+    public function isReadable($path)
+    {
+        \OCP\Util::writeLog('groupoffice', 'isreadable: ' . $path, \OCP\Util::DEBUG);
+        if ($path == '' || $path == '/') {
+            return true;
+        } else {
+            $fullpath = $this->get_real_path($path);
+
+            if ($this->is_file($path))
+                $fullpath = dirname($fullpath);
+
+            $folder = \GO\Files\Model\Folder::model()->findByPath($fullpath);
+
+            if ($folder != '') {
+                if ($folder->checkPermissionLevel(\GO\Base\Model\Acl::READ_PERMISSION)) {
+                    return true;
+                } else {
+                    return false;
+                }
+            }
+
+            return false;
+        }
+    }
+
+    public function opendir($path)
+    {
+        \OCP\Util::writeLog('groupoffice', 'opendir: ' . $path, \OCP\Util::DEBUG);
+        if ($path == '' || $path == '/') {
+            $files = array();
+            $files[] = 'ownFolder';
+
+            $shares = \GO\Files\Model\Folder::model()->getTopLevelShares(\GO\Base\Db\FindParams::newInstance()->limit(100));
+
+            foreach ($shares as $folder) {
+                $files[] = $folder->name;
+            }
+
+            \OC\Files\Stream\Dir::register('groupoffice' . $path, $files);
+            return opendir('fakedir://groupoffice' . $path);
+        } else {
+            return opendir($this->groupoffice_data . $this->get_real_path($path));
+        }
+    }
+
+    private function get_real_path($path)
+    {
+        $tmp = explode("/", $path);
+        $basefolder = $tmp[0];
+        unset($tmp[0]);
+        $realfolder = implode("/", $tmp);
+
+        if (array_key_exists($basefolder, $this->groupoffice_shares)) {
+            $realpath = $this->groupoffice_shares[$basefolder] . '/' . $realfolder;
+            return $realpath;
+        } else
+            return $path;
+    }
+
+    public function is_dir($path)
+    {
+        \OCP\Util::writeLog('groupoffice', 'isdir: ' . $path, \OCP\Util::DEBUG);
+        if ($path == '' || $path == '/') {
+            return true;
+        } else {
+            if (substr($path, -1) == '/') {
+                $path = substr($path, 0, -1);
+            }
+            return is_dir($this->groupoffice_data . $this->get_real_path($path));
+        }
+    }
+
+    public function is_file($path)
+    {
+        \OCP\Util::writeLog('groupoffice', 'isfile: ' . $path, \OCP\Util::DEBUG);
+        if ($path == '' || $path == '/') {
+            return false;
+        } else {
+            return is_file($this->groupoffice_data . $this->get_real_path($path));
+        }
+    }
+
+    public function getMimeType($path)
+    {
+        if ($this->isReadable($path)) {
+            if ($path == '' || $path == '/') {
+                return 'httpd/unix-directory';
+            } else {
+                return \OC_Helper::getMimeType($this->groupoffice_data . $this->get_real_path($path));
+            }
+        } else {
+            return false;
+        }
+    }
+
+    public function filetype($path)
+    {
+        if ($path == '' || $path == '/') {
+            return 'dir';
+        } else {
+            $realpath = $this->groupoffice_data . $this->get_real_path($path);
+            $filetype = filetype($realpath);
+            if ($filetype == 'link') {
+                $filetype = filetype(realpath($realpath));
+            }
+            return $filetype;
+        }
+    }
+
+    public function stat($path)
+    {
+        if ($path == '' || $path == '/') {
+            $stat['size'] = 0;
+            $stat['ctime'] = 0;
+            $stat['atime'] = 0;
+            $stat['mtime'] = 0;
+            return $stat;
+        } else {
+            $fullPath = $this->groupoffice_data . $this->get_real_path($path);
+            $statResult = stat($fullPath);
+
+            if ($statResult['size'] < 0) {
+                $size = self::getFileSizeFromOS($fullPath);
+                $statResult['size'] = $size;
+                $statResult[7] = $size;
+            }
+            return $statResult;
+        }
+    }
+
+    public function hasUpdated($path, $time)
+    {
+        return $this->filemtime($path) > $time;
+    }
+
+    public function filemtime($path)
+    {
+        if ($path == '' || $path == '/') {
+            $mtime = 0;
+            foreach ($this->groupoffice_shares as $map => $folder) {
+                $tmpmtime = $this->filemtime($map);
+                if ($tmpmtime > $mtime) {
+                    $mtime = $tmpmtime;
+                }
+            }
+            return $mtime;
+        } else {
+            return filemtime($this->groupoffice_data . $this->get_real_path($path));
+        }
+    }
+
+    public function isUpdatable($path)
+    {
+        \OCP\Util::writeLog('groupoffice', 'isupdatable: ' . $path, \OCP\Util::DEBUG);
+        if ($path == '' || $path == '/') {
+            return false;
+        } else {
+            if ($this->is_root_shared_folder($path)) {
+                \OCP\Util::writeLog('groupoffice', 'isupdatable: is root shared, block update', \OCP\Util::DEBUG);
+                return false;
+            }
+
+            $fullpath = $this->get_real_path($path);
+
+            if ($this->is_file($path))
+                $fullpath = dirname($fullpath);
+
+            $folder = \GO\Files\Model\Folder::model()->findByPath($fullpath);
+
+            if ($folder != '') {
+                if ($folder->checkPermissionLevel(\GO\Base\Model\Acl::WRITE_PERMISSION)) {
+                    return true;
+                } else {
+                    return false;
+                }
+            }
+
+            return false;
+        }
+    }
+
+    public function isCreatable($path)
+    {
+        \OCP\Util::writeLog('groupoffice', 'iscreatable: ' . $path, \OCP\Util::DEBUG);
+        if ($path == '' || $path == '/') {
+            return false;
+        } else {
+            $fullpath = $this->get_real_path($path);
+
+            if ($this->is_file($path))
+                $fullpath = dirname($fullpath);
+
+            $folder = \GO\Files\Model\Folder::model()->findByPath($fullpath);
+
+            if ($folder != '') {
+                if ($folder->checkPermissionLevel(\GO\Base\Model\Acl::CREATE_PERMISSION)) {
+                    return true;
+                } else {
+                    return false;
+                }
+            }
+
+            return false;
+        }
+    }
+
+    public function isDeletable($path)
+    {
+        \OCP\Util::writeLog('groupoffice', 'isdeletable: ' . $path, \OCP\Util::DEBUG);
+        if ($path == '' || $path == '/') {
+            return false;
+        } else {
+            if ($this->is_root_shared_folder($path)) {
+                \OCP\Util::writeLog('groupoffice', 'isdeletable: is root shared, block delete', \OCP\Util::DEBUG);
+                return false;
+            }
+
+            $fullpath = $this->get_real_path($path);
+
+            if ($this->is_file($path))
+                $fullpath = dirname($fullpath);
+
+            $folder = \GO\Files\Model\Folder::model()->findByPath($fullpath);
+
+            if ($folder != '') {
+                if ($folder->checkPermissionLevel(\GO\Base\Model\Acl::DELETE_PERMISSION)) {
+                    return true;
+                } else {
+                    return false;
+                }
+            }
+
+            return false;
+        }
+    }
+
+    public function file_exists($path)
+    {
+        if ($path == '' || $path == '/') {
+            return true;
+        } else {
+            return file_exists($this->groupoffice_data . $this->get_real_path($path));
+        }
+    }
+
+    public function free_space($path)
+    {
+        if ($path == '' || $path == '/') {
+            return \OC\Files\SPACE_UNKNOWN;
+        } else {
+            $space = @disk_free_space($this->groupoffice_data . $this->get_real_path($path));
+            if ($space === false) {
+                return \OC\Files\SPACE_UNKNOWN;
+            }
+            return $space;
+        }
+    }
+
+    public function mkdir($path)
+    {
+        if ($path == '' || $path == '/') {
+            return false;
+        } else {
+            $tmp_path = dirname($path);
+            if ($tmp_path == '.')
+                $tmp_path = '';
+
+            \OCP\Util::writeLog('groupoffice', 'mkdir: ' . $tmp_path, \OCP\Util::DEBUG);
+            if ($this->isCreatable($tmp_path)) {
+                $fullpath = $this->get_real_path($path);
+                $fullpath = dirname($fullpath);
+
+                $folder = \GO\Files\Model\Folder::model()->findByPath($fullpath);
+                $folder->addFolder(basename($path));
+                return true;
+
+            }
+
+            return false;
+        }
+    }
+
+    public function rmdir($path)
+    {
+        \OCP\Util::writeLog('groupoffice', 'rmdir: ' . $path, \OCP\Util::DEBUG);
+        if ($this->isDeletable($path)) {
+            return $this->delTree($path);
+        } else
+            return false;
+    }
+
+    public function fopen($path, $mode)
+    {
+        \OCP\Util::writeLog('groupoffice', 'fopen: ' . $path, \OCP\Util::DEBUG);
+        if ($path == '' || $path == '/') {
+            return false;
+        } else {
+            if ($return = fopen($this->groupoffice_data . $this->get_real_path($path), $mode)) {
+                switch ($mode) {
+                    case 'r':
+                        break;
+                    case 'r+':
+                    case 'w+':
+                    case 'x+':
+                    case 'a+':
+                        break;
+                    case 'w':
+                    case 'x':
+                    case 'a':
+                        break;
+                }
+            }
+            return $return;
+        }
+    }
+
+    public function rename($path1, $path2)
+    {
+        if (!$this->isUpdatable($path1)) {
+            return false;
+        }
+        if (!$this->file_exists($path1)) {
+            return false;
+        }
+
+        if ($return = rename($this->groupoffice_data . $this->get_real_path($path1), $this->groupoffice_data . $this->get_real_path($path2))) {
+        }
+        return $return;
+    }
+
+    public function copy($path1, $path2)
+    {
+        if ($this->isCreatable(dirname($path2))) {
+            if ($this->is_dir($path2)) {
+                if (!$this->file_exists($path2)) {
+                    $this->mkdir($path2);
+                }
+                $source = substr($path1, strrpos($path1, '/') + 1);
+                $path2 .= $source;
+            }
+            return copy($this->groupoffice_data . $this->get_real_path($path1), $this->groupoffice_data . $this->get_real_path($path2));
+        }
+    }
+
+    public function unlink($path)
+    {
+        if ($path == '' || $path == '/') {
+            return false;
+        } else {
+            if ($this->isDeletable($path)) {
+                return $this->delTree($path);
+            }
+
+            return false;
+        }
+    }
+
+    private function delTree($dir)
+    {
+        $dirRelative = $dir;
+        $dir = $this->groupoffice_data . $this->get_real_path($dir);
+        if (!file_exists($dir)) return true;
+        if (!is_dir($dir) || is_link($dir)) return unlink($dir);
+        foreach (scandir($dir) as $item) {
+            if ($item == '.' || $item == '..') continue;
+            if (is_file($dir . '/' . $item)) {
+                if (unlink($dir . '/' . $item)) {
+                }
+            } elseif (is_dir($dir . '/' . $item)) {
+                if (!$this->delTree($dirRelative . "/" . $item)) {
+                    return false;
+                };
+            }
+        }
+        if ($return = rmdir($dir)) {
+        }
+        return $return;
+    }
+
+    public function file_get_contents($path)
+    {
+        if ($path == '' || $path == '/') {
+            return false;
+        } else {
+            return file_get_contents($this->groupoffice_data . $this->get_real_path($path));
+        }
+    }
+
+    public function file_put_contents($path, $data)
+    {
+        if ($path == '' || $path == '/') {
+            return false;
+        } else {
+            if (($this->file_exists($path) && !$this->isUpdatable($path))
+                || ($this->is_dir($path) && !$this->isCreatable($path))
+            )
+                return false;
+            else
+                return file_put_contents($this->groupoffice_data . $this->get_real_path($path), $data);
+        }
+    }
+
+    public function touch($path, $mtime = null)
+    {
+        if ($this->file_exists($path) and !$this->isUpdatable($path)) {
+            return false;
+        }
+        if (!is_null($mtime)) {
+            $result = touch($this->groupoffice_data . $this->get_real_path($path), $mtime);
+        } else {
+            $result = touch($this->groupoffice_data . $this->get_real_path($path));
+        }
+        if ($result) {
+            clearstatcache(true, $this->groupoffice_data . $this->get_real_path($path));
+        }
+
+        return $result;
+    }
+}