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//
// ========================================================================
// Copyright (c) 1995-2015 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.client;
import java.util.List;
import org.eclipse.jetty.client.api.Request;
import org.eclipse.jetty.client.api.Response;
import org.eclipse.jetty.client.api.Result;
import org.eclipse.jetty.client.util.BufferingResponseListener;
import org.eclipse.jetty.http.HttpHeader;
import org.eclipse.jetty.http.HttpHeaderValue;
public class ContinueProtocolHandler implements ProtocolHandler
{
private static final String ATTRIBUTE = ContinueProtocolHandler.class.getName() + ".100continue";
private final HttpClient client;
private final ResponseNotifier notifier;
public ContinueProtocolHandler(HttpClient client)
{
this.client = client;
this.notifier = new ResponseNotifier();
}
@Override
public boolean accept(Request request, Response response)
{
boolean expect100 = request.getHeaders().contains(HttpHeader.EXPECT, HttpHeaderValue.CONTINUE.asString());
HttpConversation conversation = ((HttpRequest)request).getConversation();
boolean handled100 = conversation.getAttribute(ATTRIBUTE) != null;
return expect100 && !handled100;
}
@Override
public Response.Listener getResponseListener()
{
// Return new instances every time to keep track of the response content
return new ContinueListener();
}
protected class ContinueListener extends BufferingResponseListener
{
@Override
public void onSuccess(Response response)
{
// Handling of success must be done here and not from onComplete(),
// since the onComplete() is not invoked because the request is not completed yet.
HttpConversation conversation = ((HttpRequest)response.getRequest()).getConversation();
// Mark the 100 Continue response as handled
conversation.setAttribute(ATTRIBUTE, Boolean.TRUE);
// Reset the conversation listeners, since we are going to receive another response code
conversation.updateResponseListeners(null);
HttpExchange exchange = conversation.getExchanges().peekLast();
assert exchange.getResponse() == response;
switch (response.getStatus())
{
case 100:
{
// All good, continue
exchange.resetResponse();
exchange.proceed(null);
break;
}
default:
{
// Server either does not support 100 Continue,
// or it does and wants to refuse the request content,
// or we got some other HTTP status code like a redirect.
List<Response.ResponseListener> listeners = exchange.getResponseListeners();
HttpContentResponse contentResponse = new HttpContentResponse(response, getContent(), getMediaType(), getEncoding());
notifier.forwardSuccess(listeners, contentResponse);
exchange.proceed(new HttpRequestException("Expectation failed", exchange.getRequest()));
break;
}
}
}
@Override
public void onFailure(Response response, Throwable failure)
{
HttpConversation conversation = ((HttpRequest)response.getRequest()).getConversation();
// Mark the 100 Continue response as handled
conversation.setAttribute(ATTRIBUTE, Boolean.TRUE);
// Reset the conversation listeners to allow the conversation to be completed
conversation.updateResponseListeners(null);
HttpExchange exchange = conversation.getExchanges().peekLast();
assert exchange.getResponse() == response;
List<Response.ResponseListener> listeners = exchange.getResponseListeners();
HttpContentResponse contentResponse = new HttpContentResponse(response, getContent(), getMediaType(), getEncoding());
notifier.forwardFailureComplete(listeners, exchange.getRequest(), exchange.getRequestFailure(), contentResponse, failure);
}
@Override
public void onComplete(Result result)
{
}
}
}
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