cbjxtransport.java

jxta_src_2.41b jxta 2.41b 最新版源码 from www.jxta.org

/*
 *
 * $Id: CbJxTransport.java,v 1.7 2006/06/03 00:43:53 bondolo Exp $
 *
 * Copyright (c) 2001 Sun Microsystems, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *       Sun Microsystems, Inc. for Project JXTA."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA"
 *    must not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact Project JXTA at http://www.jxta.org.
 *
 * 5. Products derived from this software may not be called "JXTA",
 *    nor may "JXTA" appear in their name, without prior written
 *    permission of Sun.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL SUN MICROSYSTEMS OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Project JXTA.  For more
 * information on Project JXTA, please see
 * <http://www.jxta.org/>.
 *
 * This license is based on the BSD license adopted by the Apache Foundation.
 */
package net.jxta.impl.endpoint.cbjx;

import java.security.cert.Certificate;
import java.security.interfaces.RSAPublicKey;
import java.util.Collections;
import java.util.Iterator;

import java.io.IOException;

import org.apache.log4j.Level;
import org.apache.log4j.Logger;

import net.jxta.document.Advertisement;
import net.jxta.document.MimeMediaType;
import net.jxta.document.TextDocument;
import net.jxta.endpoint.ByteArrayMessageElement;
import net.jxta.endpoint.EndpointAddress;
import net.jxta.endpoint.EndpointListener;
import net.jxta.endpoint.EndpointService;
import net.jxta.endpoint.Message;
import net.jxta.endpoint.MessageElement;
import net.jxta.endpoint.MessageFilterListener;
import net.jxta.endpoint.MessageReceiver;
import net.jxta.endpoint.MessageSender;
import net.jxta.endpoint.Messenger;
import net.jxta.endpoint.TextDocumentMessageElement;
import net.jxta.endpoint.WireFormatMessage;
import net.jxta.endpoint.WireFormatMessageFactory;
import net.jxta.id.ID;
import net.jxta.id.IDFactory;
import net.jxta.membership.MembershipService;
import net.jxta.peer.PeerID;
import net.jxta.peergroup.PeerGroup;
import net.jxta.platform.Module;
import net.jxta.protocol.ModuleImplAdvertisement;

import net.jxta.exception.PeerGroupException;

import net.jxta.impl.endpoint.JxtaMessageMessageElement;
import net.jxta.impl.membership.pse.PSECredential;
import net.jxta.impl.membership.pse.PSEMembershipService;
import net.jxta.impl.membership.pse.PSEUtils;

/**
 *  A JXTA {@link net.jxta.endpoint.MessageTransport} implementation which
 * which provides message verification by examining message signatures. A
 * virtual transport, the messages are transfered between peers using some
 * other message transport.
 **/
public class CbJxTransport implements Module, MessageSender, MessageReceiver, EndpointListener {
    
    /**
     * Log4J Logger
     **/
    private final static Logger LOG = Logger.getLogger(CbJxTransport.class.getName());
    
    /**
     * the name of the cbjx valid element
     **/
    public static final String CBJX_MSG_NS = "cbjx";
    
    /**
     * the name of the cbjx crypto element
     **/
    static final String CBJX_MSG_INFO = "CryptoInfo";
    
    /**
     * the name of the cbjx body element
     **/
    static final String CBJX_MSG_BODY = "Body";
    
    /**
     * the name of the cbjx body element
     **/
    static final String CBJX_MSG_SIG = "Signature";
    
    /**
     * the cbjx protocol name
     **/
    static final String cbjxProtocolName = "cbjx";
    
    /**
     * the cbjx service name
     **/
    static final String cbjxServiceName = "CbJxTransport";
    
    /**
     * the local peer ID
     **/
    static PeerID localPeerID = null;
    
    /**
     * the endpoint address of this peer
     **/
    static EndpointAddress localPeerAddr = null;
    
    /**
     * the peer group to which this module belongs
     **/
    PeerGroup group = null;
    
    /**
     * the endpoint service in my group
     **/
    EndpointService endpoint = null;
    
    /**
     *  the membership service in my group
     **/
    PSEMembershipService membership = null;
    
    /**
     * Default constructor
     **/
    public CbJxTransport() {
        
    }
    
    /**
     *  {@inheritDoc}
     **/
    public void init(PeerGroup group, ID assignedID, Advertisement impl)
    throws PeerGroupException {
        this.group = group;
        
        ModuleImplAdvertisement implAdvertisement = (ModuleImplAdvertisement) impl;
        
        localPeerID = group.getPeerID();
        
        CbJxTransport.localPeerAddr = EndpointAddress.unmodifiableEndpointAddress(
                new EndpointAddress( cbjxProtocolName, group.getPeerID().getUniqueValue().toString(), null, null ) );
        
        if (LOG.isEnabledFor(Level.INFO)) {
            StringBuffer configInfo = new StringBuffer( "Configuring CbJx Transport : " + assignedID );
            
            configInfo.append( "\n\tImplementation :" );
            configInfo.append( "\n\t\tModule Spec ID : " + implAdvertisement.getModuleSpecID());
            configInfo.append( "\n\t\tImpl Description : " + implAdvertisement.getDescription());
            configInfo.append( "\n\t\tImpl URI : " + implAdvertisement.getUri());
            configInfo.append( "\n\t\tImpl Code : " + implAdvertisement.getCode());
            
            configInfo.append( "\n\tGroup Params :" );
            configInfo.append( "\n\t\tGroup : " + group.getPeerGroupName() );
            configInfo.append( "\n\t\tGroup ID : " + group.getPeerGroupID() );
            configInfo.append( "\n\t\tPeer ID : " + group.getPeerID() );
            
            configInfo.append( "\n\tConfiguration :" );
            configInfo.append( "\n\t\tPublic Address : " + CbJxTransport.localPeerAddr );
            
            LOG.info( configInfo );
        }
    }
    
    /**
     *  {@inheritDoc}
     **/
    public int startApp(String[] arg) {
        
        endpoint = group.getEndpointService();
        
        if( null == endpoint ) {
            LOG.warn("Stalled until there is an endpoint service");
            return START_AGAIN_STALLED;
        }
        
        MembershipService groupMembership = group.getMembershipService();
        
        if( null == groupMembership ) {
            LOG.warn("Stalled until there is a membership service");
            return START_AGAIN_STALLED;
        }
        
        if( !(groupMembership instanceof PSEMembershipService) ) {
            if (LOG.isEnabledFor(Level.ERROR)) {
                LOG.error( "CBJX Transport requires PSE Membership Service" );
            }
            return -1;
        }
        
        membership = (PSEMembershipService) groupMembership;
        
        if (endpoint.addMessageTransport(this) == null) {
            if (LOG.isEnabledFor(Level.ERROR)) {
                LOG.error("Transport registration refused");
            }
            return -1;
        }
        
        // XXX [e-mail] 20030526 check for errors
        
        endpoint.addIncomingMessageListener( this, cbjxServiceName, null );
        
        endpoint.addIncomingMessageFilterListener( new CbJxInputFilter(), null, null );
        //        endpoint.addOutgoingMessageFilterListener( new CbJxOutputFilter(), null, null );
        
        if (LOG.isEnabledFor(Level.INFO)) {
            LOG.info("CbJxTransport started");
        }
        
        return 0;
    }
    
    /**
     *  {@inheritDoc}
     **/
    public void stopApp() {
        
        if (endpoint != null) {
            // FIXME 20030516 [e-mail] remove filters and listener
            
            endpoint.removeMessageTransport(this);
            endpoint = null;
        }
                
        if (LOG.isEnabledFor(Level.INFO)) {
            LOG.info("CbJxTransport stopped");
        }
    }
    
    /**
     *  {@inheritDoc}
     **/
    public EndpointAddress getPublicAddress() {
        return CbJxTransport.localPeerAddr;
    }
    
    /**
     *  {@inheritDoc}
     **/
    public boolean isConnectionOriented() {
        //since we rely on other endpoint protocol
        //we are not connection oriented
        return false;
    }
    
    /**
     *  {@inheritDoc}
     **/
    public boolean allowsRouting() {
        //since we are using the endpoint router
        //the endpoint router cannot use our endpoint to send messages
        return false;
    }
    
    /**
     *  {@inheritDoc}
     **/
    public EndpointService getEndpointService() {
        return (EndpointService) endpoint.getInterface();
    }
    
    /**
     *  {@inheritDoc}
     **/
    public Object transportControl(Object operation, Object value) {
        return null;
    }
    
    /**
     *  {@inheritDoc}
     **/
    public Iterator getPublicAddresses() {
        return Collections.singletonList( getPublicAddress() ).iterator();
    }
    
    /**
     *  {@inheritDoc}
     **/
    public String getProtocolName() {
        return cbjxProtocolName;
    }
    
    /**
     * {@inheritDoc}
     **/
    public Messenger getMessenger( EndpointAddress dest, Object hintIgnored ) {
        try {
            return new CbJxMessenger( this, dest, hintIgnored );
        } catch ( IOException failed ) {
            if (LOG.isEnabledFor(Level.WARN)) {
                LOG.warn( "Failed to create cbjx messenger", failed );
            }
            return null;
        }
    }
    
    /**
     *(@inheritdoc}
     */
    public boolean isPropagateEnabled() {
        
        return false;
    }
    
    /**
     *(@inheritdoc}
     */
    public boolean isPropagationSupported() {
        
        return false;
    }