| // ======================================================================== |
| // Copyright (c) 2008-2009 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.io.IOException; |
| |
| import org.eclipse.jetty.http.HttpHeaders; |
| import org.eclipse.jetty.http.HttpSchemes; |
| import org.eclipse.jetty.http.HttpStatus; |
| import org.eclipse.jetty.io.Buffer; |
| |
| /** |
| * RedirectListener |
| * |
| * Detect and handle the redirect responses |
| */ |
| public class RedirectListener extends HttpEventListenerWrapper |
| { |
| private final HttpExchange _exchange; |
| private HttpDestination _destination; |
| private String _location; |
| private int _attempts; |
| private boolean _requestComplete; |
| private boolean _responseComplete; |
| private boolean _redirected; |
| |
| public RedirectListener(HttpDestination destination, HttpExchange ex) |
| { |
| // Start of sending events through to the wrapped listener |
| // Next decision point is the onResponseStatus |
| super(ex.getEventListener(),true); |
| |
| _destination = destination; |
| _exchange = ex; |
| } |
| |
| @Override |
| public void onResponseStatus( Buffer version, int status, Buffer reason ) |
| throws IOException |
| { |
| _redirected = ((status == HttpStatus.MOVED_PERMANENTLY_301 || |
| status == HttpStatus.MOVED_TEMPORARILY_302) && |
| _attempts < _destination.getHttpClient().maxRedirects()); |
| |
| if (_redirected) |
| { |
| setDelegatingRequests(false); |
| setDelegatingResponses(false); |
| } |
| |
| super.onResponseStatus(version,status,reason); |
| } |
| |
| |
| @Override |
| public void onResponseHeader( Buffer name, Buffer value ) |
| throws IOException |
| { |
| if (_redirected) |
| { |
| int header = HttpHeaders.CACHE.getOrdinal(name); |
| switch (header) |
| { |
| case HttpHeaders.LOCATION_ORDINAL: |
| _location = value.toString(); |
| break; |
| } |
| } |
| super.onResponseHeader(name,value); |
| } |
| |
| @Override |
| public void onRequestComplete() throws IOException |
| { |
| _requestComplete = true; |
| |
| if (checkExchangeComplete()) |
| { |
| super.onRequestComplete(); |
| } |
| } |
| |
| @Override |
| public void onResponseComplete() throws IOException |
| { |
| _responseComplete = true; |
| |
| if (checkExchangeComplete()) |
| { |
| super.onResponseComplete(); |
| } |
| } |
| |
| public boolean checkExchangeComplete() |
| throws IOException |
| { |
| if (_redirected && _requestComplete && _responseComplete) |
| { |
| if (_location != null) |
| { |
| if (_location.indexOf("://")>0) |
| _exchange.setURL(_location); |
| else |
| _exchange.setRequestURI(_location); |
| |
| // destination may have changed |
| HttpDestination destination=_destination.getHttpClient().getDestination(_exchange.getAddress(),HttpSchemes.HTTPS.equals(String.valueOf(_exchange.getScheme()))); |
| |
| if (_destination==destination) |
| _destination.resend(_exchange); |
| else |
| { |
| // unwrap to find ultimate listener. |
| HttpEventListener listener=this; |
| while(listener instanceof HttpEventListenerWrapper) |
| listener=((HttpEventListenerWrapper)listener).getEventListener(); |
| //reset the listener |
| _exchange.getEventListener().onRetry(); |
| _exchange.reset(); |
| _exchange.setEventListener(listener); |
| destination.send(_exchange); |
| } |
| |
| return false; |
| } |
| else |
| { |
| setDelegationResult(false); |
| } |
| } |
| |
| return true; |
| } |
| |
| public void onRetry() |
| { |
| _redirected=false; |
| _attempts++; |
| |
| setDelegatingRequests(true); |
| setDelegatingResponses(true); |
| |
| _requestComplete=false; |
| _responseComplete=false; |
| |
| super.onRetry(); |
| } |
| } |
| |