OCA\Richdocuments\Controller\SessionController::join PHP Method

    public function join($fileId)
    {
        try {
            $view = \OC\Files\Filesystem::getView();
            $path = $view->getPath($fileId);
            if ($view->isUpdatable($path)) {
                $file = new File($fileId);
                $response = Db\Session::start($this->uid, $file);
            } else {
                $info = $view->getFileInfo($path);
                $response = ['permissions' => $info['permissions'], 'id' => $fileId];
            }
            $response = array_merge($response, ['status' => 'success']);
        } catch (\Exception $e) {
            $this->logger->warning('Starting a session failed. Reason: ' . $e->getMessage(), ['app' => $this->appName]);
            $response = ['status' => 'error'];
        }
        return $response;
    }