/* vim:set ts=4 sw=4 et cindent: */
/* 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/. */

#include "nsISupports.idl"

interface nsINetAddr;
interface nsIUDPSocketListener;
interface nsIUDPMessage;
interface nsISocketTransport;
interface nsIOutputStream;

%{ C++
namespace mozilla {
namespace net {
union NetAddr;
}
}
%}
native NetAddr(mozilla::net::NetAddr);
[ptr] native NetAddrPtr(mozilla::net::NetAddr);

/**
 * nsIUDPSocket
 *
 * An interface to a UDP socket that can accept incoming connections.
 */
[scriptable, uuid(6EFE692D-F0B0-4A9E-9E63-837C7452446D)]
interface nsIUDPSocket : nsISupports
{
    /**
     * init
     *
     * This method initializes a UDP socket.
     *
     * @param aPort
     *        The port of the UDP socket.  Pass -1 to indicate no preference,
     *        and a port will be selected automatically.
     * @param aLoopbackOnly
     *        If true, the UDP socket will only respond to connections on the
     *        local loopback interface.  Otherwise, it will accept connections
     *        from any interface.  To specify a particular network interface,
     *        use initWithAddress.
     */
    void init(in long aPort, in boolean aLoopbackOnly);

    /**
     * initWithAddress
     *
     * This method initializes a UDP socket, and binds it to a particular
     * local address (and hence a particular local network interface).
     *
     * @param aAddr
     *        The address to which this UDP socket should be bound.
     */
    [noscript] void initWithAddress([const] in NetAddrPtr aAddr);

    /**
     * close
     *
     * This method closes a UDP socket.  This does not affect already
     * connected client sockets (i.e., the nsISocketTransport instances
     * created from this UDP socket).  This will cause the onStopListening
     * event to asynchronously fire with a status of NS_BINDING_ABORTED.
     */
    void close();

    /**
     * asyncListen
     *
     * This method puts the UDP socket in the listening state.  It will
     * asynchronously listen for and accept client connections.  The listener
     * will be notified once for each client connection that is accepted.  The
     * listener's onSocketAccepted method will be called on the same thread
     * that called asyncListen (the calling thread must have a nsIEventTarget).
     *
     * The listener will be passed a reference to an already connected socket
     * transport (nsISocketTransport).  See below for more details.
     *
     * @param aListener
     *        The listener to be notified when client connections are accepted.
     */
    void asyncListen(in nsIUDPSocketListener aListener);

    /**
     * Returns the port of this UDP socket.
     */
    readonly attribute long port;

    /**
     * Returns the address to which this UDP socket is bound.  Since a
     * UDP socket may be bound to multiple network devices, this address
     * may not necessarily be specific to a single network device.  In the
     * case of an IP socket, the IP address field would be zerod out to
     * indicate a UDP socket bound to all network devices.  Therefore,
     * this method cannot be used to determine the IP address of the local
     * system.  See nsIDNSService::myHostName if this is what you need.
     */
    [noscript] NetAddr getAddress();

    /**
     * send
     *
     * Send out the datagram to specified remote host and port.
     * DNS lookup will be triggered.
     *
     * @param host The remote host name.
     * @param port The remote port.
     * @param data The buffer containing the data to be written.
     * @param dataLength The maximum number of bytes to be written.
     * @return number of bytes written. (0 or dataLength)
     */
    unsigned long send(in AUTF8String host, in unsigned short port,
                       [const, array, size_is(dataLength)]in uint8_t data,
                       in unsigned long dataLength);

    /**
     * sendWithAddr
     *
     * Send out the datagram to specified remote host and port.
     *
     * @param addr The remote host address.
     * @param data The buffer containing the data to be written.
     * @param dataLength The maximum number of bytes to be written.
     * @return number of bytes written. (0 or dataLength)
     */
    unsigned long sendWithAddr(in nsINetAddr addr,
                               [const, array, size_is(dataLength)]in uint8_t data,
                               in unsigned long dataLength);

    /**
     * sendWithAddress
     *
     * Send out the datagram to specified remote address and port.
     *
     * @param addr The remote host address.
     * @param data The buffer containing the data to be written.
     * @param dataLength The maximum number of bytes to be written.
     * @return number of bytes written. (0 or dataLength)
     */
    [noscript] unsigned long sendWithAddress([const] in NetAddrPtr addr,
                                             [const, array, size_is(dataLength)]in uint8_t data,
                                             in unsigned long dataLength);
};

/**
 * nsIUDPSocketListener
 *
 * This interface is notified whenever a UDP socket accepts a new connection.
 * The transport is in the connected state, and read/write streams can be opened
 * using the normal nsITransport API.  The address of the client can be found by
 * calling the nsISocketTransport::GetAddress method or by inspecting
 * nsISocketTransport::GetHost, which returns a string representation of the
 * client's IP address (NOTE: this may be an IPv4 or IPv6 string literal).
 */
[scriptable, uuid(2E4B5DD3-7358-4281-B81F-10C62EF39CB5)]
interface nsIUDPSocketListener : nsISupports
{
    /**
     * onPacketReceived
     *
     * This method is called when a client sends an UDP packet.
     *
     * @param aSocket
     *        The UDP socket.
     * @param aMessage
     *        The message.
     */
    void onPacketReceived(in nsIUDPSocket aSocket,
                          in nsIUDPMessage aMessage);

    /**
     * onStopListening
     *
     * This method is called when the listening socket stops for some reason.
     * The UDP socket is effectively dead after this notification.
     *
     * @param aSocket
     *        The UDP socket.
     * @param aStatus
     *        The reason why the UDP socket stopped listening.  If the
     *        UDP socket was manually closed, then this value will be
     *        NS_BINDING_ABORTED.
     */
    void onStopListening(in nsIUDPSocket aSocket, in nsresult aStatus);
};

/**
 * nsIUDPMessage
 *
 * This interface is used to encapsulate an incomming UDP message
 */
[scriptable, uuid(333D5D69-8117-4AA6-9E16-2DD4FD6AEBA6)]
interface nsIUDPMessage : nsISupports
{
    /**
     * Address of the source of the message
     */
    readonly attribute nsINetAddr fromAddr;

    /**
     * Data of the message
     */
    readonly attribute ACString data;

    /**
     * Stream to send a response
     */
    readonly attribute nsIOutputStream outputStream;
};
