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A builder-style HTTP client API, including authentication, and extensible handling of common content-types such as JSON and XML. It is built on top of Apache's HttpClient.
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/*
     ESXX - The friendly ECMAscript/XML Application Server
     Copyright (C) 2007-2010 Martin Blom 

     This program is free software: you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public License
     as published by the Free Software Foundation, either version 3
     of the License, or (at your option) any later version.

     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU Lesser General Public License for more details.

     You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see .


     PLEASE NOTE THAT THIS FILE'S LICENSE IS DIFFERENT FROM THE REST OF ESXX!
*/

package groovyx.net.http.thirdparty;

import java.io.*;
import java.net.*;
import java.util.concurrent.TimeUnit;
import org.apache.http.*;
import org.apache.http.conn.*;
import org.apache.http.conn.routing.HttpRoute;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.message.BasicHttpResponse;
import org.apache.http.params.*;
import org.apache.http.protocol.*;

import com.google.appengine.api.urlfetch.*;

class GAEClientConnection
  implements ManagedClientConnection {

  public GAEClientConnection(ClientConnectionManager cm, HttpRoute route, Object state) {
    this.connManager = cm;
    this.route = route;
    this.state = state;
    this.closed = true;
  }

  // From interface ManagedClientConnection

  public boolean isSecure() {
    return route.isSecure();
  }

  public HttpRoute getRoute() {
    return route;
  }

  public javax.net.ssl.SSLSession getSSLSession() {
    return null;
  }

  public void open(HttpRoute route, HttpContext context, HttpParams params)
    throws IOException {
    close();
    this.route = route;
//     System.err.println(">>>>");
  }

  public void tunnelTarget(boolean secure, HttpParams params)
    throws IOException {
    throw new IOException("tunnelTarget() not supported");
  }

  public void tunnelProxy(HttpHost next, boolean secure, HttpParams params)
    throws IOException {
    throw new IOException("tunnelProxy() not supported");
  }

  public void layerProtocol(HttpContext context, HttpParams params)
    throws IOException {
    throw new IOException("layerProtocol() not supported");
  }

  public void markReusable() {
    reusable = true;
  }

  public void unmarkReusable() {
    reusable = false;
  }

  public boolean isMarkedReusable() {
    return reusable;
  }

  public void setState(Object state) {
    this.state = state;
  }

  public Object getState() {
    return state;
  }

  public void setIdleDuration(long duration, TimeUnit unit) {
    // Do nothing
  }


  // From interface HttpClientConnection

  public boolean isResponseAvailable(int timeout)
    throws IOException {
    return response != null;
  }


  public void sendRequestHeader(HttpRequest request)
    throws HttpException, IOException {
    try {
      HttpHost host = route.getTargetHost();

      URI uri = new URI(host.getSchemeName()
            + "://"
            + host.getHostName()
            + ((host.getPort() == -1) ? "" : (":" + host.getPort()))
            + request.getRequestLine().getUri());

      this.request = new HTTPRequest(uri.toURL(),
                     HTTPMethod.valueOf(request.getRequestLine().getMethod()),
                     FetchOptions.Builder.disallowTruncate().doNotFollowRedirects());
    }
    catch (URISyntaxException ex) {
      throw new IOException("Malformed request URI: " + ex.getMessage(), ex);
    }
    catch (IllegalArgumentException ex) {
      throw new IOException("Unsupported HTTP method: " + ex.getMessage(), ex);
    }

//     System.err.println("SEND: " + this.request.getMethod() + " " + this.request.getURL());

    for (Header h : request.getAllHeaders()) {
//       System.err.println("SEND: " + h.getName() + ": " + h.getValue());
      this.request.addHeader(new HTTPHeader(h.getName(), h.getValue()));
    }
  }


  public void sendRequestEntity(HttpEntityEnclosingRequest request)
    throws HttpException, IOException {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    if (request.getEntity() != null) {
      request.getEntity().writeTo(baos);
    }
    this.request.setPayload(baos.toByteArray());
  }


  public HttpResponse receiveResponseHeader()
    throws HttpException, IOException {
    if (this.response == null) {
      flush();
    }

    HttpResponse response = new BasicHttpResponse(new ProtocolVersion("HTTP", 1, 1),
                          this.response.getResponseCode(),
                          null);
//     System.err.println("RECV: " + response.getStatusLine());

    for (HTTPHeader h : this.response.getHeaders()) {
//       System.err.println("RECV: " + h.getName() + ": " + h.getValue());
      response.addHeader(h.getName(), h.getValue());
    }

    return response;
  }


  public void receiveResponseEntity(HttpResponse response)
    throws HttpException, IOException {
    if (this.response == null) {
      throw new IOException("receiveResponseEntity() called on closed connection");
    }

    ByteArrayEntity bae = new ByteArrayEntity(this.response.getContent());
    bae.setContentType(response.getFirstHeader("Content-Type"));
    response.setEntity(bae);

    response = null;
  }

  public void flush()
    throws IOException {
    if (request != null) {
      try {
//  System.err.println("----");
    response = urlFS.fetch(request);
    request = null;
      }catch (IOException ex) {
    ex.printStackTrace();
    throw ex;
      }
    }
    else {
      response = null;
    }
  }


  // From interface HttpConnection

  public void close()
    throws IOException {
    request  = null;
    response = null;
    closed   = true;
//     System.err.println("<<<<");
  }

  public boolean isOpen() {
    return request != null || response != null;
  }

  public boolean isStale() {
    return !isOpen() && !closed;
  }

  public void setSocketTimeout(int timeout) {
  }

  public int getSocketTimeout() {
    return -1;
  }

  public void shutdown()
    throws IOException {
    close();
  }

  public HttpConnectionMetrics getMetrics() {
    return null;
  }


  // From interface HttpInetConnection

  public InetAddress getLocalAddress() {
    return null;
  }

  public int getLocalPort() {
    return 0;
  }

  public InetAddress getRemoteAddress() {
    return null;
  }

  public int getRemotePort() {
    HttpHost host = route.getTargetHost();
    return connManager.getSchemeRegistry().getScheme(host).resolvePort(host.getPort());
  }


  // From interface ConnectionReleaseTrigger

  public void releaseConnection()
    throws IOException {
    connManager.releaseConnection(this, Long.MAX_VALUE, TimeUnit.MILLISECONDS);
  }

  public void abortConnection()
    throws IOException {
    unmarkReusable();
    shutdown();
  }

  private ClientConnectionManager connManager;
  private HttpRoute route;
  private Object state;
  private boolean reusable;

  private HTTPRequest request;
  private HTTPResponse response;
  private boolean closed;

  private static URLFetchService urlFS = URLFetchServiceFactory.getURLFetchService();
}