/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim: set sw=4 ts=4 et tw=80 : */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

interface nsIURI;
interface nsIInterfaceRequestor;
interface nsILoadGroup;
interface nsIWebSocketListener;
interface nsIInputStream;

#include "nsISupports.idl"

/**
 * Low-level websocket API: handles network protocol.  
 *
 * This is primarly intended for use by the higher-level nsIWebSocket.idl.
 * We are also making it scriptable for now, but this may change once we have
 * WebSockets for Workers.
 */
[scriptable, uuid(9ee5874c-ec39-4bc2-b2d7-194a4c98c9d2)]
interface nsIWebSocketChannel : nsISupports
{
    /**
     * The original URI used to construct the protocol connection. This is used
     * in the case of a redirect or URI "resolution" (e.g. resolving a
     * resource: URI to a file: URI) so that the original pre-redirect
     * URI can still be obtained.  This is never null.
     */
    readonly attribute nsIURI originalURI;

    /**
     * The readonly URI corresponding to the protocol connection after any
     * redirections are completed.
     */
    readonly attribute nsIURI URI;

    /**
     * The notification callbacks for authorization, etc..
     */
    attribute nsIInterfaceRequestor notificationCallbacks;

    /**
     * Transport-level security information (if any)
     */
    readonly attribute nsISupports securityInfo;

    /**
     * The load group of the websockets code.
     */
    attribute nsILoadGroup loadGroup;

    /**
     * Sec-Websocket-Protocol value
     */
    attribute ACString protocol;

    /**
     * Sec-Websocket-Extensions response header value
     */
    readonly attribute ACString extensions;

    /**
     * Asynchronously open the websocket connection.  Received messages are fed
     * to the socket listener as they arrive.  The socket listener's methods
     * are called on the thread that calls asyncOpen and are not called until
     * after asyncOpen returns.  If asyncOpen returns successfully, the
     * protocol implementation promises to call at least onStop on the listener.
     *
     * NOTE: Implementations should throw NS_ERROR_ALREADY_OPENED if the
     * websocket connection is reopened.
     *
     * @param aURI the uri of the websocket protocol - may be redirected
     * @param aOrigin the uri of the originating resource
     * @param aListener the nsIWebSocketListener implementation
     * @param aContext an opaque parameter forwarded to aListener's methods
     */
    void asyncOpen(in nsIURI aURI,
                   in ACString aOrigin,
                   in nsIWebSocketListener aListener,
                   in nsISupports aContext);

    /*
     * Close the websocket connection for writing - no more calls to sendMsg
     * or sendBinaryMsg should be made after calling this. The listener object
     * may receive more messages if a server close has not yet been received.
     *
     * @param aCode the websocket closing handshake close code. Set to 0 if
     *        you are not providing a code.
     * @param aReason the websocket closing handshake close reason
     */
    void close(in unsigned short aCode, in AUTF8String aReason);
    
    // section 7.4.1 defines these close codes
    const unsigned short CLOSE_NORMAL               = 1000;
    const unsigned short CLOSE_GOING_AWAY           = 1001;
    const unsigned short CLOSE_PROTOCOL_ERROR       = 1002;
    const unsigned short CLOSE_UNSUPPORTED_DATATYPE = 1003;
    //  code 1004 is reserved
    const unsigned short CLOSE_NO_STATUS            = 1005;
    const unsigned short CLOSE_ABNORMAL             = 1006;
    const unsigned short CLOSE_INVALID_PAYLOAD      = 1007;
    const unsigned short CLOSE_POLICY_VIOLATION     = 1008;
    const unsigned short CLOSE_TOO_LARGE            = 1009;
    const unsigned short CLOSE_EXTENSION_MISSING    = 1010;
    // Initially used just for server-side internal errors: adopted later for
    // client-side errors too (not clear if will make into spec: see 
    // http://www.ietf.org/mail-archive/web/hybi/current/msg09372.html
    const unsigned short CLOSE_INTERNAL_ERROR       = 1011;
    // MUST NOT be set as a status code in Close control frame by an endpoint:
    // To be used if TLS handshake failed (ex: server certificate unverifiable)
    const unsigned short CLOSE_TLS_FAILED           = 1015;

    /**
     * Use to send text message down the connection to WebSocket peer.
     *
     * @param aMsg the utf8 string to send
     */
    void sendMsg(in AUTF8String aMsg);

    /**
     * Use to send binary message down the connection to WebSocket peer.
     *
     * @param aMsg the data to send
     */
    void sendBinaryMsg(in ACString aMsg);

    /** 
     * Use to send a binary stream (Blob) to Websocket peer.
     *
     * @param aStream The input stream to be sent.  
     */
    void sendBinaryStream(in nsIInputStream aStream, 
                          in unsigned long length);

    /**
     * This value determines how often (in milliseconds) websocket keepalive
     * pings are sent.  If set to 0 (the default), no pings are ever sent.
     *
     * This value can currently only be set before asyncOpen is called, else 
     * NS_ERROR_IN_PROGRESS is thrown.
     *
     * Be careful using this setting: ping traffic can consume lots of power and
     * bandwidth over time.
     */
    attribute unsigned long pingInterval;

    /**
     * This value determines how long (in milliseconds) the websocket waits for
     * the server to reply to a ping that has been sent.
     *
     * This value can currently only be set before asyncOpen is called, else 
     * NS_ERROR_IN_PROGRESS is thrown.
     */
    attribute unsigned long pingTimeout;

};
