//
// ========================================================================
// Copyright (c) 1995-2017 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.websocket.server;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.Executor;
import java.util.function.Consumer;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.http.HttpStatus;
import org.eclipse.jetty.http.HttpVersion;
import org.eclipse.jetty.io.ByteBufferPool;
import org.eclipse.jetty.io.EndPoint;
import org.eclipse.jetty.io.MappedByteBufferPool;
import org.eclipse.jetty.server.ConnectionFactory;
import org.eclipse.jetty.server.Connector;
import org.eclipse.jetty.server.HttpConfiguration;
import org.eclipse.jetty.server.HttpConnection;
import org.eclipse.jetty.server.HttpConnectionFactory;
import org.eclipse.jetty.server.handler.ContextHandler;
import org.eclipse.jetty.util.DecoratedObjectFactory;
import org.eclipse.jetty.util.StringUtil;
import org.eclipse.jetty.util.component.ContainerLifeCycle;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.eclipse.jetty.util.ssl.SslContextFactory;
import org.eclipse.jetty.util.thread.ScheduledExecutorScheduler;
import org.eclipse.jetty.util.thread.Scheduler;
import org.eclipse.jetty.websocket.api.InvalidWebSocketException;
import org.eclipse.jetty.websocket.api.WebSocketException;
import org.eclipse.jetty.websocket.api.WebSocketPolicy;
import org.eclipse.jetty.websocket.api.extensions.ExtensionFactory;
import org.eclipse.jetty.websocket.api.util.QuoteUtil;
import org.eclipse.jetty.websocket.common.LogicalConnection;
import org.eclipse.jetty.websocket.common.SessionFactory;
import org.eclipse.jetty.websocket.common.WebSocketSession;
import org.eclipse.jetty.websocket.common.WebSocketSessionFactory;
import org.eclipse.jetty.websocket.common.events.EventDriver;
import org.eclipse.jetty.websocket.common.events.EventDriverFactory;
import org.eclipse.jetty.websocket.common.extensions.ExtensionStack;
import org.eclipse.jetty.websocket.common.extensions.WebSocketExtensionFactory;
import org.eclipse.jetty.websocket.common.io.AbstractWebSocketConnection;
import org.eclipse.jetty.websocket.common.scopes.WebSocketContainerScope;
import org.eclipse.jetty.websocket.servlet.ServletUpgradeRequest;
import org.eclipse.jetty.websocket.servlet.ServletUpgradeResponse;
import org.eclipse.jetty.websocket.servlet.WebSocketCreator;
import org.eclipse.jetty.websocket.servlet.WebSocketServletFactory;
/**
* Factory to create WebSocket connections
*/
public class WebSocketServerFactory extends ContainerLifeCycle implements WebSocketCreator, WebSocketContainerScope, WebSocketServletFactory
{
private static final Logger LOG = Log.getLogger(WebSocketServerFactory.class);
private final ClassLoader contextClassloader;
private final Map<Integer, WebSocketHandshake> handshakes = new HashMap<>();
// TODO: obtain shared (per server scheduler, somehow)
private final Scheduler scheduler = new ScheduledExecutorScheduler();
private final List<WebSocketSession.Listener> listeners = new CopyOnWriteArrayList<>();
private final String supportedVersions;
private final WebSocketPolicy defaultPolicy;
private final EventDriverFactory eventDriverFactory;
private final ByteBufferPool bufferPool;
private final WebSocketExtensionFactory extensionFactory;
private final ServletContext context; // can be null when this factory is used from WebSocketHandler
private final List<SessionFactory> sessionFactories = new ArrayList<>();
private final List<Class<?>> registeredSocketClasses = new ArrayList<>();
private Executor executor;
private DecoratedObjectFactory objectFactory;
private WebSocketCreator creator;
public WebSocketServerFactory(ServletContext context)
{
this(context, WebSocketPolicy.newServerPolicy(), new MappedByteBufferPool());
}
public WebSocketServerFactory(ServletContext context, ByteBufferPool bufferPool)
{
this(context, WebSocketPolicy.newServerPolicy(), bufferPool);
}
/**
* Entry point for {@link org.eclipse.jetty.websocket.servlet.WebSocketServletFactory.Loader}
*
* @param context the servlet context
* @param policy the policy to use
*/
public WebSocketServerFactory(ServletContext context, WebSocketPolicy policy)
{
this(context, policy, new MappedByteBufferPool());
}
public WebSocketServerFactory(ServletContext context, WebSocketPolicy policy, ByteBufferPool bufferPool)
{
this(Objects.requireNonNull(context, ServletContext.class.getName()), policy, null, null, bufferPool);
}
/**
* Protected entry point for {@link WebSocketHandler}
*
* @param policy the policy to use
* @param executor the executor to use
* @param bufferPool the buffer pool to use
*/
protected WebSocketServerFactory(WebSocketPolicy policy, Executor executor, ByteBufferPool bufferPool)
{
this(null, policy, new DecoratedObjectFactory(), executor, bufferPool);
}
private WebSocketServerFactory(ServletContext context, WebSocketPolicy policy, DecoratedObjectFactory objectFactory, Executor executor, ByteBufferPool bufferPool)
{
this.context = context;
this.objectFactory = objectFactory;
this.executor = executor;
handshakes.put(HandshakeRFC6455.VERSION, new HandshakeRFC6455());
addBean(scheduler);
addBean(bufferPool);
this.contextClassloader = Thread.currentThread().getContextClassLoader();
this.defaultPolicy = policy;
this.eventDriverFactory = new EventDriverFactory(this);
this.bufferPool = bufferPool;
this.extensionFactory = new WebSocketExtensionFactory(this);
this.sessionFactories.add(new WebSocketSessionFactory(this));
this.creator = this;
// Create supportedVersions
List<Integer> versions = new ArrayList<>();
for (int v : handshakes.keySet())
{
versions.add(v);
}
Collections.sort(versions, Collections.reverseOrder()); // newest first
StringBuilder rv = new StringBuilder();
for (int v : versions)
{
if (rv.length() > 0)
{
rv.append(", ");
}
rv.append(v);
}
supportedVersions = rv.toString();
}
public void addSessionListener(WebSocketSession.Listener listener)
{
listeners.add(listener);
}
public void removeSessionListener(WebSocketSession.Listener listener)
{
listeners.remove(listener);
}
@Override
public boolean acceptWebSocket(HttpServletRequest request, HttpServletResponse response) throws IOException
{
return acceptWebSocket(getCreator(), request, response);
}
@Override
public boolean acceptWebSocket(WebSocketCreator creator, HttpServletRequest request, HttpServletResponse response) throws IOException
{
ClassLoader old = Thread.currentThread().getContextClassLoader();
try
{
Thread.currentThread().setContextClassLoader(contextClassloader);
// Create Servlet Specific Upgrade Request/Response objects
ServletUpgradeRequest sockreq = new ServletUpgradeRequest(request);
ServletUpgradeResponse sockresp = new ServletUpgradeResponse(response);
Object websocketPojo = creator.createWebSocket(sockreq, sockresp);
// Handle response forbidden (and similar paths)
if (sockresp.isCommitted())
{
return false;
}
if (websocketPojo == null)
{
// no creation, sorry
sockresp.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE, "Endpoint Creation Failed");
return false;
}
// Allow Decorators to do their thing
websocketPojo = getObjectFactory().decorate(websocketPojo);
// Get the original HTTPConnection
HttpConnection connection = (HttpConnection) request.getAttribute("org.eclipse.jetty.server.HttpConnection");
// Send the upgrade
EventDriver driver = eventDriverFactory.wrap(websocketPojo);
return upgrade(connection, sockreq, sockresp, driver);
}
catch (URISyntaxException e)
{
throw new IOException("Unable to accept websocket due to mangled URI", e);
}
finally
{
Thread.currentThread().setContextClassLoader(old);
}
}
public void addSessionFactory(SessionFactory sessionFactory)
{
if (sessionFactories.contains(sessionFactory))
{
return;
}
this.sessionFactories.add(sessionFactory);
}
private WebSocketSession createSession(URI requestURI, EventDriver websocket, LogicalConnection connection)
{
if (websocket == null)
{
throw new InvalidWebSocketException("Unable to create Session from null websocket");
}
for (SessionFactory impl : sessionFactories)
{
if (impl.supports(websocket))
{
try
{
return impl.createSession(requestURI, websocket, connection);
}
catch (Throwable e)
{
throw new InvalidWebSocketException("Unable to create Session", e);
}
}
}
throw new InvalidWebSocketException("Unable to create Session: unrecognized internal EventDriver type: " + websocket.getClass().getName());
}
/**
* Default Creator logic
*/
@Override
public Object createWebSocket(ServletUpgradeRequest req, ServletUpgradeResponse resp)
{
if (registeredSocketClasses.size() < 1)
{
throw new WebSocketException("No WebSockets have been registered with the factory. Cannot use default implementation of WebSocketCreator.");
}
if (registeredSocketClasses.size() > 1)
{
LOG.warn("You have registered more than 1 websocket object, and are using the default WebSocketCreator! Using first registered websocket.");
}
Class<?> firstClass = registeredSocketClasses.get(0);
try
{
return objectFactory.createInstance(firstClass);
}
catch (InstantiationException | IllegalAccessException e)
{
throw new WebSocketException("Unable to create instance of " + firstClass, e);
}
}
@Override
protected void doStart() throws Exception
{
if(this.objectFactory == null && context != null)
{
this.objectFactory = (DecoratedObjectFactory) context.getAttribute(DecoratedObjectFactory.ATTR);
if (this.objectFactory == null)
{
throw new IllegalStateException("Unable to find required ServletContext attribute: " + DecoratedObjectFactory.ATTR);
}
}
if(this.executor == null && context != null)
{
ContextHandler contextHandler = ContextHandler.getContextHandler(context);
this.executor = contextHandler.getServer().getThreadPool();
}
Objects.requireNonNull(this.objectFactory, DecoratedObjectFactory.class.getName());
Objects.requireNonNull(this.executor, Executor.class.getName());
super.doStart();
}
@Override
public ByteBufferPool getBufferPool()
{
return this.bufferPool;
}
@Override
public WebSocketCreator getCreator()
{
return this.creator;
}
@Override
public Executor getExecutor()
{
return this.executor;
}
public DecoratedObjectFactory getObjectFactory()
{
return objectFactory;
}
public EventDriverFactory getEventDriverFactory()
{
return eventDriverFactory;
}
@Override
public ExtensionFactory getExtensionFactory()
{
return extensionFactory;
}
public Collection<WebSocketSession> getOpenSessions()
{
return getBeans(WebSocketSession.class);
}
@Override
public WebSocketPolicy getPolicy()
{
return defaultPolicy;
}
@Override
public SslContextFactory getSslContextFactory()
{
/* Not relevant for a Server, as this is defined in the
* Connector configuration
*/
return null;
}
@Override
public boolean isUpgradeRequest(HttpServletRequest request, HttpServletResponse response)
{
// Tests sorted by least common to most common.
String upgrade = request.getHeader("Upgrade");
if (upgrade == null)
{
// no "Upgrade: websocket" header present.
return false;
}
if (!"websocket".equalsIgnoreCase(upgrade))
{
// Not a websocket upgrade
return false;
}
String connection = request.getHeader("Connection");
if (connection == null)
{
// no "Connection: upgrade" header present.
return false;
}
// Test for "Upgrade" token
boolean foundUpgradeToken = false;
Iterator<String> iter = QuoteUtil.splitAt(connection, ",");
while (iter.hasNext())
{
String token = iter.next();
if ("upgrade".equalsIgnoreCase(token))
{
foundUpgradeToken = true;
break;
}
}
if (!foundUpgradeToken)
{
return false;
}
if (!"GET".equalsIgnoreCase(request.getMethod()))
{
// not a "GET" request (not a websocket upgrade)
return false;
}
if (!"HTTP/1.1".equals(request.getProtocol()))
{
LOG.debug("Not a 'HTTP/1.1' request (was [" + request.getProtocol() + "])");
return false;
}
return true;
}
@Override
public void onSessionOpened(WebSocketSession session)
{
addManaged(session);
notifySessionListeners(listener -> listener.onOpened(session));
}
@Override
public void onSessionClosed(WebSocketSession session)
{
removeBean(session);
notifySessionListeners(listener -> listener.onClosed(session));
}
private void notifySessionListeners(Consumer<WebSocketSession.Listener> consumer)
{
for (WebSocketSession.Listener listener : listeners)
{
try
{
consumer.accept(listener);
}
catch (Throwable x)
{
LOG.info("Exception while invoking listener " + listener, x);
}
}
}
@Override
public void register(Class<?> websocketPojo)
{
registeredSocketClasses.add(websocketPojo);
}
@Override
public void setCreator(WebSocketCreator creator)
{
this.creator = creator;
}
/**
* Upgrade the request/response to a WebSocket Connection.
* <p/>
* This method will not normally return, but will instead throw a UpgradeConnectionException, to exit HTTP handling and initiate WebSocket handling of the
* connection.
*
* @param http the raw http connection
* @param request The request to upgrade
* @param response The response to upgrade
* @param driver The websocket handler implementation to use
*/
private boolean upgrade(HttpConnection http, ServletUpgradeRequest request, ServletUpgradeResponse response, EventDriver driver) throws IOException
{
if (!"websocket".equalsIgnoreCase(request.getHeader("Upgrade")))
{
throw new IllegalStateException("Not a 'WebSocket: Upgrade' request");
}
if (!"HTTP/1.1".equals(request.getHttpVersion()))
{
throw new IllegalStateException("Not a 'HTTP/1.1' request");
}
int version = request.getHeaderInt("Sec-WebSocket-Version");
if (version < 0)
{
// Old pre-RFC version specifications (header not present in RFC-6455)
version = request.getHeaderInt("Sec-WebSocket-Draft");
}
WebSocketHandshake handshaker = handshakes.get(version);
if (handshaker == null)
{
StringBuilder warn = new StringBuilder();
warn.append("Client ").append(request.getRemoteAddress());
warn.append(" (:").append(request.getRemotePort());
warn.append(") User Agent: ");
String ua = request.getHeader("User-Agent");
if (ua == null)
{
warn.append("[unset] ");
}
else
{
warn.append('"').append(StringUtil.sanitizeXmlString(ua)).append("\" ");
}
warn.append("requested WebSocket version [").append(version);
warn.append("], Jetty supports version");
if (handshakes.size() > 1)
{
warn.append('s');
}
warn.append(": [").append(supportedVersions).append("]");
LOG.warn(warn.toString());
// Per RFC 6455 - 4.4 - Supporting Multiple Versions of WebSocket Protocol
// Using the examples as outlined
response.setHeader("Sec-WebSocket-Version", supportedVersions);
response.sendError(HttpStatus.BAD_REQUEST_400, "Unsupported websocket version specification");
return false;
}
// Initialize / Negotiate Extensions
ExtensionStack extensionStack = new ExtensionStack(getExtensionFactory());
// The JSR allows for the extensions to be pre-negotiated, filtered, etc...
// Usually from a Configurator.
if (response.isExtensionsNegotiated())
{
// Use pre-negotiated extension list from response
extensionStack.negotiate(response.getExtensions());
}
else
{
// Use raw extension list from request
extensionStack.negotiate(request.getExtensions());
}
// Get original HTTP connection
EndPoint endp = http.getEndPoint();
Connector connector = http.getConnector();
Executor executor = connector.getExecutor();
ByteBufferPool bufferPool = connector.getByteBufferPool();
// Setup websocket connection
AbstractWebSocketConnection wsConnection = new WebSocketServerConnection(endp, executor, scheduler, driver.getPolicy(), bufferPool);
extensionStack.setPolicy(driver.getPolicy());
extensionStack.configure(wsConnection.getParser());
extensionStack.configure(wsConnection.getGenerator());
if (LOG.isDebugEnabled())
{
LOG.debug("HttpConnection: {}", http);
LOG.debug("WebSocketConnection: {}", wsConnection);
}
// Setup Session
WebSocketSession session = createSession(request.getRequestURI(), driver, wsConnection);
session.setUpgradeRequest(request);
// set true negotiated extension list back to response
response.setExtensions(extensionStack.getNegotiatedExtensions());
session.setUpgradeResponse(response);
wsConnection.addListener(session);
// Setup Incoming Routing
wsConnection.setNextIncomingFrames(extensionStack);
extensionStack.setNextIncoming(session);
// Setup Outgoing Routing
session.setOutgoingHandler(extensionStack);
extensionStack.setNextOutgoing(wsConnection);
// Start Components
session.addManaged(extensionStack);
this.addManaged(session);
if (session.isFailed())
{
throw new IOException("Session failed to start");
}
// Tell jetty about the new upgraded connection
request.setServletAttribute(HttpConnection.UPGRADE_CONNECTION_ATTRIBUTE, wsConnection);
if (LOG.isDebugEnabled())
LOG.debug("Handshake Response: {}", handshaker);
if (getSendServerVersion(connector))
response.setHeader("Server", HttpConfiguration.SERVER_VERSION);
// Process (version specific) handshake response
handshaker.doHandshakeResponse(request, response);
if (LOG.isDebugEnabled())
LOG.debug("Websocket upgrade {} {} {} {}", request.getRequestURI(), version, response.getAcceptedSubProtocol(), wsConnection);
return true;
}
private boolean getSendServerVersion(Connector connector)
{
ConnectionFactory connFactory = connector.getConnectionFactory(HttpVersion.HTTP_1_1.asString());
if (connFactory == null)
return false;
if (connFactory instanceof HttpConnectionFactory)
{
HttpConfiguration httpConf = ((HttpConnectionFactory) connFactory).getHttpConfiguration();
if (httpConf != null)
return httpConf.getSendServerVersion();
}
return false;
}
}