Summary

The source code is divided into the following packages, all are sub-packages of the the overall 'winswitch' package:

• ROOT: the root package contains the build scripts, copyright and release notes
• winswitch: the root package contains constants, build information and other global attributes
• winswitch.client: contains the classes needed for implementing clients, including the applet
• winswitch.fs: filesystem support classes for both clients and servers (currently just NFS and SMB)
• winswitch.net: networking utility classes: mDNS, local socket connections, general network protocol, etc
• winswitch.objects: the objects representing servers, users, sessions, settings, mount points, etc
• winswitch.server: classes for implementing servers, including server-side session utility wrappers
• winswitch.sound: everything related to sound support
• winswitch.twisted: twisted enhancements required for supporting hidden shell processes with Twisted on MS Windows
• winswitch.ui: all the user interface classes: utility classes, configuration dialogs and operating system specific code for desktop interaction
• winswitch.util: generic utility classes: key management, encryption, authentication, file handling, logging, desktop menu integration, etc
• winswitch.virt: virtualization classes: both client and server support classes for all the underlying protocols supported (NX, Xpra, VNC,...)

Server Link

The ServerLink class is central to the whole system on the client side.
It represents the link to a server instance, including SSH tunnels if needed.

It is a lower level utility class, as such it does not depend on any user interface classes or functions, these must be injected by any classes using it from a context that requires user interaction. If these are not set, the functionality will simply be disabled. This is done by setting:

• message_handler(ServerConfig, title, text, type): this will be used for event notifications
• question_handler(title, text, nok_callback, ok_callback, password, buttons, icon, UUID): this is used for asking the user for confirmation, keys, passphrases etc.
• cancel_question(UUID): this is used for cancelling a question when it becomes irrelevant

The only implementation currently in use for question_handler and cancel_question uses the DialogUtil class documented below.
The most commonly used public methods on this class are:

• stop(): log outs from the server and disconnects
• kick(): tries to re-connect to the server

Dialog Util

The DialogUtil class provides utility functions for interacting with the user via dialogs.
The public functions are:

• ask(title, text, cancel_callback, ok_callback, password=False, buttons=None, icon=None, UUID=None): implements a simple dialog window which can be used to ask the user generic questions and may include a password field. The UUID can be used to ensure that the same dialog is now shown multiple times and that it can be cancelled.
• cancel_ask(UUID): is used to cancel an existing dialog

Clients

The ClientBase is the base class for implementing clients.
It does not depend on any user interface components but defines some no-op functions that the Applet subclass implements using the DialogUtil class documented above.