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/**
* $RCSfile$
* $Revision: $
* $Date: $
*
* Copyright (C) 2006 Jive Software. All rights reserved.
*
* This software is published under the terms of the GNU Public License (GPL),
* a copy of which is included in this distribution.
*/
package org.jivesoftware.wildfire.http;
import org.xmlpull.v1.XmlPullParserFactory;
import org.xmlpull.v1.XmlPullParserException;
import org.jivesoftware.util.Log;
import org.jivesoftware.wildfire.net.MXParser;
import org.jivesoftware.wildfire.auth.UnauthorizedException;
import org.dom4j.io.XMPPPacketReader;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.DocumentHelper;
import org.mortbay.util.ajax.ContinuationSupport;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import javax.servlet.ServletConfig;
import java.io.IOException;
import java.net.InetAddress;
/**
* Servlet which handles requests to the HTTP binding service. It determines if there is currently
* an {@link HttpSession} related to the connection or if one needs to be created and then passes
* it off to the {@link HttpBindManager} for processing of the client request and formulating of
* the response.
*
* @author Alexander Wenckus
*/
public class HttpBindServlet extends HttpServlet {
private HttpSessionManager sessionManager;
private static XmlPullParserFactory factory;
static {
try {
factory = XmlPullParserFactory.newInstance(MXParser.class.getName(), null);
}
catch (XmlPullParserException e) {
Log.error("Error creating a parser factory", e);
}
}
private ThreadLocal<XMPPPacketReader> localReader = new ThreadLocal<XMPPPacketReader>();
public HttpBindServlet() {
}
@Override public void init(ServletConfig servletConfig) throws ServletException {
super.init(servletConfig);
sessionManager = HttpBindManager.getInstance().getSessionManager();
sessionManager.start();
}
@Override public void destroy() {
super.destroy();
sessionManager.stop();
}
@Override protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
if (isContinuation(request, response)) {
return;
}
Document document;
try {
document = createDocument(request);
}
catch (Exception e) {
Log.warn("Error parsing user request. [" + request.getRemoteAddr() + "]");
response.sendError(HttpServletResponse.SC_BAD_REQUEST,
"Unable to parse request content: " + e.getMessage());
return;
}
Element node = document.getRootElement();
if (node == null || !"body".equals(node.getName())) {
Log.warn("Body missing from request content. [" + request.getRemoteAddr() + "]");
response.sendError(HttpServletResponse.SC_BAD_REQUEST,
"Body missing from request content.");
return;
}
String sid = node.attributeValue("sid");
// We have a new session
if (sid == null) {
createNewSession(request, response, node);
}
else {
handleSessionRequest(sid, request, response, node);
}
}
private boolean isContinuation(HttpServletRequest request, HttpServletResponse response)
throws IOException
{
HttpSession session = (HttpSession) request.getAttribute("request-session");
if (session == null) {
return false;
}
synchronized (session) {
respond(response, session.getResponse((Long) request.getAttribute("request"))
.getBytes("utf-8"));
}
return true;
}
private void handleSessionRequest(String sid, HttpServletRequest request,
HttpServletResponse response, Element rootNode)
throws IOException
{
long rid = getLongAttribue(rootNode.attributeValue("rid"), -1);
if (rid <= 0) {
response.sendError(HttpServletResponse.SC_BAD_REQUEST, "Body missing RID (Request ID)");
return;
}
HttpSession session = sessionManager.getSession(sid);
if (session == null) {
Log.warn("Client provided invalid session: " + sid + ". [" +
request.getRemoteAddr() + "]");
response.sendError(HttpServletResponse.SC_NOT_FOUND, "Invalid SID.");
return;
}
synchronized (session) {
HttpConnection connection;
try {
connection = sessionManager.forwardRequest(rid, session,
request.isSecure(), rootNode);
}
catch (HttpBindException e) {
response.sendError(e.getHttpError(), e.getMessage());
if(e.shouldCloseSession()) {
session.close();
}
return;
}
catch (HttpConnectionClosedException nc) {
Log.error("Error sending packet to client.", nc);
return;
}
String type = rootNode.attributeValue("type");
if ("terminate".equals(type)) {
session.close();
respond(response, createEmptyBody().getBytes("utf-8"));
}
else {
connection
.setContinuation(ContinuationSupport.getContinuation(request, connection));
request.setAttribute("request-session", connection.getSession());
request.setAttribute("request", connection.getRequestId());
respond(response, connection);
}
}
}
private void createNewSession(HttpServletRequest request, HttpServletResponse response,
Element rootNode)
throws IOException
{
long rid = getLongAttribue(rootNode.attributeValue("rid"), -1);
if (rid <= 0) {
response.sendError(HttpServletResponse.SC_BAD_REQUEST, "Body missing RID (Request ID)");
return;
}
try {
HttpConnection connection = new HttpConnection(rid, request.isSecure());
InetAddress address = InetAddress.getByName(request.getRemoteAddr());
connection.setSession(sessionManager.createSession(address, rootNode, connection));
respond(response, connection);
}
catch (UnauthorizedException e) {
// Server wasn't initialized yet.
response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
"Server Not initialized");
}
catch (HttpBindException e) {
response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
}
}
private void respond(HttpServletResponse response, HttpConnection connection)
throws IOException
{
byte[] content;
try {
content = connection.getResponse().getBytes("utf-8");
}
catch (HttpBindTimeoutException e) {
content = createEmptyBody().getBytes("utf-8");
}
respond(response, content);
}
private void respond(HttpServletResponse response, byte [] content) throws IOException {
response.setStatus(HttpServletResponse.SC_OK);
response.setContentType("text/xml");
response.setCharacterEncoding("utf-8");
response.setContentLength(content.length);
response.getOutputStream().write(content);
}
private static String createEmptyBody() {
Element body = DocumentHelper.createElement("body");
body.addNamespace("", "http://jabber.org/protocol/httpbind");
return body.asXML();
}
private long getLongAttribue(String value, long defaultValue) {
if (value == null || "".equals(value)) {
return defaultValue;
}
try {
return Long.valueOf(value);
}
catch (Exception ex) {
return defaultValue;
}
}
private Document createDocument(HttpServletRequest request) throws
DocumentException, IOException, XmlPullParserException {
// Reader is associated with a new XMPPPacketReader
XMPPPacketReader reader = localReader.get();
if (reader == null) {
reader = new XMPPPacketReader();
reader.setXPPFactory(factory);
localReader.set(reader);
}
return reader.read("utf-8", request.getInputStream());
}
}