org.jivesoftware.smackx.filetransfer.IBBTransferNegotiator Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of smack Show documentation
Smack is an Open Source XMPP (Jabber) client library for instant messaging and presence. This library provides the client side functionality as specified in the core XMPP specifications as related to the client side of said specifications.
The newest version!
/**
 * $RCSfile$
 * $Revision: $
 * $Date: $
 *
 * Copyright 2003-2006 Jive Software.
 *
 * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jivesoftware.smackx.filetransfer;

import java.io.InputStream;
import java.io.OutputStream;

import org.jivesoftware.smack.Connection;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.filter.AndFilter;
import org.jivesoftware.smack.filter.FromContainsFilter;
import org.jivesoftware.smack.filter.PacketFilter;
import org.jivesoftware.smack.filter.PacketTypeFilter;
import org.jivesoftware.smack.packet.IQ;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smackx.bytestreams.ibb.InBandBytestreamManager;
import org.jivesoftware.smackx.bytestreams.ibb.InBandBytestreamRequest;
import org.jivesoftware.smackx.bytestreams.ibb.InBandBytestreamSession;
import org.jivesoftware.smackx.bytestreams.ibb.packet.Open;
import org.jivesoftware.smackx.packet.StreamInitiation;

/**
 * The In-Band Bytestream file transfer method, or IBB for short, transfers the
 * file over the same XML Stream used by XMPP. It is the fall-back mechanism in
 * case the SOCKS5 bytestream method of transferring files is not available.
 * 
 * @author Alexander Wenckus
 * @author Henning Staib
 * @see XEP-0047: In-Band
 *      Bytestreams (IBB)
 */
public class IBBTransferNegotiator extends StreamNegotiator {

    private Connection connection;

    private InBandBytestreamManager manager;

    /**
     * The default constructor for the In-Band Bytestream Negotiator.
     * 
     * @param connection The connection which this negotiator works on.
     */
    protected IBBTransferNegotiator(Connection connection) {
        this.connection = connection;
        this.manager = InBandBytestreamManager.getByteStreamManager(connection);
    }

    public OutputStream createOutgoingStream(String streamID, String initiator,
                    String target) throws XMPPException {
        InBandBytestreamSession session = this.manager.establishSession(target, streamID);
        session.setCloseBothStreamsEnabled(true);
        return session.getOutputStream();
    }

    public InputStream createIncomingStream(StreamInitiation initiation)
                    throws XMPPException {
        /*
         * In-Band Bytestream initiation listener must ignore next in-band
         * bytestream request with given session ID
         */
        this.manager.ignoreBytestreamRequestOnce(initiation.getSessionID());

        Packet streamInitiation = initiateIncomingStream(this.connection, initiation);
        return negotiateIncomingStream(streamInitiation);
    }

    public PacketFilter getInitiationPacketFilter(String from, String streamID) {
        /*
         * this method is always called prior to #negotiateIncomingStream() so
         * the In-Band Bytestream initiation listener must ignore the next
         * In-Band Bytestream request with the given session ID
         */
        this.manager.ignoreBytestreamRequestOnce(streamID);

        return new AndFilter(new FromContainsFilter(from), new IBBOpenSidFilter(streamID));
    }

    public String[] getNamespaces() {
        return new String[] { InBandBytestreamManager.NAMESPACE };
    }

    InputStream negotiateIncomingStream(Packet streamInitiation) throws XMPPException {
        // build In-Band Bytestream request
        InBandBytestreamRequest request = new ByteStreamRequest(this.manager,
                        (Open) streamInitiation);

        // always accept the request
        InBandBytestreamSession session = request.accept();
        session.setCloseBothStreamsEnabled(true);
        return session.getInputStream();
    }

    public void cleanup() {
    }

    /**
     * This PacketFilter accepts an incoming In-Band Bytestream open request
     * with a specified session ID.
     */
    private static class IBBOpenSidFilter extends PacketTypeFilter {

        private String sessionID;

        public IBBOpenSidFilter(String sessionID) {
            super(Open.class);
            if (sessionID == null) {
                throw new IllegalArgumentException("StreamID cannot be null");
            }
            this.sessionID = sessionID;
        }

        public boolean accept(Packet packet) {
            if (super.accept(packet)) {
                Open bytestream = (Open) packet;

                // packet must by of type SET and contains the given session ID
                return this.sessionID.equals(bytestream.getSessionID())
                                && IQ.Type.SET.equals(bytestream.getType());
            }
            return false;
        }
    }

    /**
     * Derive from InBandBytestreamRequest to access protected constructor.
     */
    private static class ByteStreamRequest extends InBandBytestreamRequest {

        private ByteStreamRequest(InBandBytestreamManager manager, Open byteStreamRequest) {
            super(manager, byteStreamRequest);
        }

    }

}