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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.qpid.server.management.plugin.servlet.rest;
import java.io.IOException;
import java.nio.ByteBuffer;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.qpid.server.message.MessageDeletedException;
import org.apache.qpid.server.message.MessageReference;
import org.apache.qpid.server.message.ServerMessage;
import org.apache.qpid.server.model.Queue;
import org.apache.qpid.server.model.VirtualHost;
import org.apache.qpid.server.queue.QueueEntry;
import org.apache.qpid.server.queue.QueueEntryVisitor;
public class MessageContentServlet extends AbstractServlet
{
public MessageContentServlet()
{
super();
}
@Override
protected void doGetWithSubjectAndActor(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
{
String[] pathInfoElements = getPathInfoElements(request);
if(pathInfoElements != null && pathInfoElements.length > 2)
{
getMessageContent(request, response);
}
}
private void getMessageContent(HttpServletRequest request, HttpServletResponse response) throws IOException
{
Queue queue = getQueueFromRequest(request);
String path[] = getPathInfoElements(request);
MessageFinder finder = new MessageFinder(Long.parseLong(path[2]));
queue.visit(finder);
if(finder.isFound())
{
response.setContentType(finder.getMimeType());
response.setContentLength((int) finder.getSize());
getOutputStream(request, response).write(finder.getContent());
}
}
private Queue getQueueFromRequest(HttpServletRequest request)
{
// TODO - validation that there is a vhost and queue and only those in the path
String[] pathInfoElements = getPathInfoElements(request);
if(pathInfoElements == null || pathInfoElements.length < 2)
{
throw new IllegalArgumentException("Invalid path is specified");
}
String vhostName = pathInfoElements[0];
String queueName = pathInfoElements[1];
VirtualHost<?,?,?> vhost = getBroker().findVirtualHostByName(vhostName);
if (vhost == null)
{
throw new IllegalArgumentException("Could not find virtual host with name '" + vhostName + "'");
}
return getQueueFromVirtualHost(queueName, vhost);
}
private Queue getQueueFromVirtualHost(String queueName, VirtualHost<?,?,?> vhost)
{
Queue queue = null;
for(Queue q : vhost.getQueues())
{
if(q.getName().equals(queueName))
{
queue = q;
break;
}
}
return queue;
}
private class MessageFinder implements QueueEntryVisitor
{
private final long _messageNumber;
private String _mimeType;
private long _size;
private byte[] _content;
private boolean _found;
private MessageFinder(long messageNumber)
{
_messageNumber = messageNumber;
}
public boolean visit(QueueEntry entry)
{
ServerMessage message = entry.getMessage();
if(message != null)
{
if(_messageNumber == message.getMessageNumber())
{
try
{
MessageReference reference = message.newReference();
try
{
_mimeType = message.getMessageHeader().getMimeType();
_size = message.getSize();
_content = new byte[(int) _size];
_found = true;
message.getContent(ByteBuffer.wrap(_content), 0);
}
finally
{
reference.release();
}
return true;
}
catch (MessageDeletedException e)
{
// ignore - the message was deleted as we tried too look at it, treat as if no message found
}
}
}
return false;
}
public String getMimeType()
{
return _mimeType;
}
public long getSize()
{
return _size;
}
public byte[] getContent()
{
return _content;
}
public boolean isFound()
{
return _found;
}
}
}
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