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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.tomcat.websocket;
import java.io.IOException;
import java.net.URI;
import java.nio.ByteBuffer;
import java.nio.channels.WritePendingException;
import java.nio.charset.StandardCharsets;
import java.security.Principal;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicLong;
import javax.websocket.CloseReason;
import javax.websocket.CloseReason.CloseCode;
import javax.websocket.CloseReason.CloseCodes;
import javax.websocket.DeploymentException;
import javax.websocket.Endpoint;
import javax.websocket.EndpointConfig;
import javax.websocket.Extension;
import javax.websocket.MessageHandler;
import javax.websocket.MessageHandler.Partial;
import javax.websocket.MessageHandler.Whole;
import javax.websocket.PongMessage;
import javax.websocket.RemoteEndpoint;
import javax.websocket.SendResult;
import javax.websocket.Session;
import javax.websocket.WebSocketContainer;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.InstanceManager;
import org.apache.tomcat.util.ExceptionUtils;
import org.apache.tomcat.util.res.StringManager;
public class WsSession implements Session {
// An ellipsis is a single character that looks like three periods in a row
// and is used to indicate a continuation.
private static final byte[] ELLIPSIS_BYTES =
"\u2026".getBytes(StandardCharsets.UTF_8);
// An ellipsis is three bytes in UTF-8
private static final int ELLIPSIS_BYTES_LEN = ELLIPSIS_BYTES.length;
private static final StringManager sm =
StringManager.getManager(Constants.PACKAGE_NAME);
private static AtomicLong ids = new AtomicLong(0);
private final Log log = LogFactory.getLog(WsSession.class);
private final Endpoint localEndpoint;
private final WsRemoteEndpointImplBase wsRemoteEndpoint;
private final RemoteEndpoint.Async remoteEndpointAsync;
private final RemoteEndpoint.Basic remoteEndpointBasic;
private final ClassLoader applicationClassLoader;
private final WsWebSocketContainer webSocketContainer;
private final URI requestUri;
private final Map> requestParameterMap;
private final String queryString;
private final Principal userPrincipal;
private final EndpointConfig endpointConfig;
private final List negotiatedExtensions;
private final String subProtocol;
private final Map pathParameters;
private final boolean secure;
private final String httpSessionId;
private final String id;
// Expected to handle message types of only
private MessageHandler textMessageHandler = null;
// Expected to handle message types of only
private MessageHandler binaryMessageHandler = null;
private MessageHandler.Whole pongMessageHandler = null;
private volatile State state = State.OPEN;
private final Object stateLock = new Object();
private final Map userProperties = new ConcurrentHashMap();
private volatile int maxBinaryMessageBufferSize =
Constants.DEFAULT_BUFFER_SIZE;
private volatile int maxTextMessageBufferSize =
Constants.DEFAULT_BUFFER_SIZE;
private volatile long maxIdleTimeout = 0;
private volatile long lastActive = System.currentTimeMillis();
private Map futures =
new ConcurrentHashMap();
/**
* Creates a new WebSocket session for communication between the two
* provided end points. The result of {@link Thread#getContextClassLoader()}
* at the time this constructor is called will be used when calling
* {@link Endpoint#onClose(Session, CloseReason)}.
*
* @param localEndpoint
* @param wsRemoteEndpoint
* @param negotiatedExtensions
* @throws DeploymentException
*/
public WsSession(Endpoint localEndpoint,
WsRemoteEndpointImplBase wsRemoteEndpoint,
WsWebSocketContainer wsWebSocketContainer,
URI requestUri, Map> requestParameterMap,
String queryString, Principal userPrincipal, String httpSessionId,
List negotiatedExtensions, String subProtocol, Map pathParameters,
boolean secure, EndpointConfig endpointConfig) throws DeploymentException {
this.localEndpoint = localEndpoint;
this.wsRemoteEndpoint = wsRemoteEndpoint;
this.wsRemoteEndpoint.setSession(this);
this.remoteEndpointAsync = new WsRemoteEndpointAsync(wsRemoteEndpoint);
this.remoteEndpointBasic = new WsRemoteEndpointBasic(wsRemoteEndpoint);
this.webSocketContainer = wsWebSocketContainer;
applicationClassLoader = Thread.currentThread().getContextClassLoader();
wsRemoteEndpoint.setSendTimeout(
wsWebSocketContainer.getDefaultAsyncSendTimeout());
this.maxBinaryMessageBufferSize =
webSocketContainer.getDefaultMaxBinaryMessageBufferSize();
this.maxTextMessageBufferSize =
webSocketContainer.getDefaultMaxTextMessageBufferSize();
this.maxIdleTimeout =
webSocketContainer.getDefaultMaxSessionIdleTimeout();
this.requestUri = requestUri;
if (requestParameterMap == null) {
this.requestParameterMap = Collections.emptyMap();
} else {
this.requestParameterMap = requestParameterMap;
}
this.queryString = queryString;
this.userPrincipal = userPrincipal;
this.httpSessionId = httpSessionId;
this.negotiatedExtensions = negotiatedExtensions;
if (subProtocol == null) {
this.subProtocol = "";
} else {
this.subProtocol = subProtocol;
}
this.pathParameters = pathParameters;
this.secure = secure;
this.wsRemoteEndpoint.setEncoders(endpointConfig);
this.endpointConfig = endpointConfig;
this.userProperties.putAll(endpointConfig.getUserProperties());
this.id = Long.toHexString(ids.getAndIncrement());
InstanceManager instanceManager = webSocketContainer.getInstanceManager();
if (instanceManager != null) {
try {
instanceManager.newInstance(localEndpoint);
} catch (Exception e) {
throw new DeploymentException(sm.getString("wsSession.instanceNew"), e);
}
}
if (log.isDebugEnabled()) {
log.debug(sm.getString("wsSession.created", id));
}
}
@Override
public WebSocketContainer getContainer() {
checkState();
return webSocketContainer;
}
@Override
public void addMessageHandler(MessageHandler listener) {
Class target = Util.getMessageType(listener);
doAddMessageHandler(target, listener);
}
@Override
public void addMessageHandler(Class clazz, Partial handler)
throws IllegalStateException {
doAddMessageHandler(clazz, handler);
}
@Override
public void addMessageHandler(Class clazz, Whole handler)
throws IllegalStateException {
doAddMessageHandler(clazz, handler);
}
@SuppressWarnings("unchecked")
private void doAddMessageHandler(Class target, MessageHandler listener) {
checkState();
// Message handlers that require decoders may map to text messages,
// binary messages, both or neither.
// The frame processing code expects binary message handlers to
// accept ByteBuffer
// Use the POJO message handler wrappers as they are designed to wrap
// arbitrary objects with MessageHandlers and can wrap MessageHandlers
// just as easily.
Set mhResults =
Util.getMessageHandlers(target, listener, endpointConfig, this);
for (MessageHandlerResult mhResult : mhResults) {
switch (mhResult.getType()) {
case TEXT: {
if (textMessageHandler != null) {
throw new IllegalStateException(
sm.getString("wsSession.duplicateHandlerText"));
}
textMessageHandler = mhResult.getHandler();
break;
}
case BINARY: {
if (binaryMessageHandler != null) {
throw new IllegalStateException(
sm.getString("wsSession.duplicateHandlerBinary"));
}
binaryMessageHandler = mhResult.getHandler();
break;
}
case PONG: {
if (pongMessageHandler != null) {
throw new IllegalStateException(
sm.getString("wsSession.duplicateHandlerPong"));
}
MessageHandler handler = mhResult.getHandler();
if (handler instanceof MessageHandler.Whole) {
pongMessageHandler =
(MessageHandler.Whole) handler;
} else {
throw new IllegalStateException(
sm.getString("wsSession.invalidHandlerTypePong"));
}
break;
}
default: {
throw new IllegalArgumentException(sm.getString(
"wsSession.unknownHandlerType", listener,
mhResult.getType()));
}
}
}
}
@Override
public Set getMessageHandlers() {
checkState();
Set result = new HashSet();
if (binaryMessageHandler != null) {
result.add(binaryMessageHandler);
}
if (textMessageHandler != null) {
result.add(textMessageHandler);
}
if (pongMessageHandler != null) {
result.add(pongMessageHandler);
}
return result;
}
@Override
public void removeMessageHandler(MessageHandler listener) {
checkState();
if (listener == null) {
return;
}
MessageHandler wrapped = null;
if (listener instanceof WrappedMessageHandler) {
wrapped = ((WrappedMessageHandler) listener).getWrappedHandler();
}
if (wrapped == null) {
wrapped = listener;
}
boolean removed = false;
if (wrapped.equals(textMessageHandler) ||
listener.equals(textMessageHandler)) {
textMessageHandler = null;
removed = true;
}
if (wrapped.equals(binaryMessageHandler) ||
listener.equals(binaryMessageHandler)) {
binaryMessageHandler = null;
removed = true;
}
if (wrapped.equals(pongMessageHandler) ||
listener.equals(pongMessageHandler)) {
pongMessageHandler = null;
removed = true;
}
if (!removed) {
// ISE for now. Could swallow this silently / log this if the ISE
// becomes a problem
throw new IllegalStateException(
sm.getString("wsSession.removeHandlerFailed", listener));
}
}
@Override
public String getProtocolVersion() {
checkState();
return Constants.WS_VERSION_HEADER_VALUE;
}
@Override
public String getNegotiatedSubprotocol() {
checkState();
return subProtocol;
}
@Override
public List getNegotiatedExtensions() {
checkState();
return negotiatedExtensions;
}
@Override
public boolean isSecure() {
checkState();
return secure;
}
@Override
public boolean isOpen() {
return state == State.OPEN;
}
@Override
public long getMaxIdleTimeout() {
checkState();
return maxIdleTimeout;
}
@Override
public void setMaxIdleTimeout(long timeout) {
checkState();
this.maxIdleTimeout = timeout;
}
@Override
public void setMaxBinaryMessageBufferSize(int max) {
checkState();
this.maxBinaryMessageBufferSize = max;
}
@Override
public int getMaxBinaryMessageBufferSize() {
checkState();
return maxBinaryMessageBufferSize;
}
@Override
public void setMaxTextMessageBufferSize(int max) {
checkState();
this.maxTextMessageBufferSize = max;
}
@Override
public int getMaxTextMessageBufferSize() {
checkState();
return maxTextMessageBufferSize;
}
@Override
public Set getOpenSessions() {
checkState();
return webSocketContainer.getOpenSessions(localEndpoint);
}
@Override
public RemoteEndpoint.Async getAsyncRemote() {
checkState();
return remoteEndpointAsync;
}
@Override
public RemoteEndpoint.Basic getBasicRemote() {
checkState();
return remoteEndpointBasic;
}
@Override
public void close() throws IOException {
close(new CloseReason(CloseCodes.NORMAL_CLOSURE, ""));
}
@Override
public void close(CloseReason closeReason) throws IOException {
doClose(closeReason, closeReason);
}
/**
* WebSocket 1.0. Section 2.1.5.
* Need internal close method as spec requires that the local endpoint
* receives a 1006 on timeout.
*/
public void doClose(CloseReason closeReasonMessage,
CloseReason closeReasonLocal) {
// Double-checked locking. OK because state is volatile
if (state != State.OPEN) {
return;
}
synchronized (stateLock) {
if (state != State.OPEN) {
return;
}
if (log.isDebugEnabled()) {
log.debug(sm.getString("wsSession.doClose", id));
}
try {
wsRemoteEndpoint.setBatchingAllowed(false);
} catch (IOException e) {
log.warn(sm.getString("wsSession.flushFailOnClose"), e);
fireEndpointOnError(e);
}
state = State.OUTPUT_CLOSED;
sendCloseMessage(closeReasonMessage);
fireEndpointOnClose(closeReasonLocal);
}
IOException ioe = new IOException(sm.getString("wsSession.messageFailed"));
SendResult sr = new SendResult(ioe);
for (FutureToSendHandler f2sh : futures.keySet()) {
f2sh.onResult(sr);
}
}
/**
* Called when a close message is received. Should only ever happen once.
* Also called after a protocol error when the ProtocolHandler needs to
* force the closing of the connection.
*/
public void onClose(CloseReason closeReason) {
synchronized (stateLock) {
if (state != State.CLOSED) {
try {
wsRemoteEndpoint.setBatchingAllowed(false);
} catch (IOException e) {
log.warn(sm.getString("wsSession.flushFailOnClose"), e);
fireEndpointOnError(e);
}
if (state == State.OPEN) {
state = State.OUTPUT_CLOSED;
sendCloseMessage(closeReason);
fireEndpointOnClose(closeReason);
}
state = State.CLOSED;
// Close the socket
wsRemoteEndpoint.close();
}
}
}
private void fireEndpointOnClose(CloseReason closeReason) {
// Fire the onClose event
Throwable throwable = null;
InstanceManager instanceManager = webSocketContainer.getInstanceManager();
Thread t = Thread.currentThread();
ClassLoader cl = t.getContextClassLoader();
t.setContextClassLoader(applicationClassLoader);
try {
localEndpoint.onClose(this, closeReason);
} catch (Throwable t1) {
ExceptionUtils.handleThrowable(t1);
throwable = t1;
} finally {
if (instanceManager != null) {
try {
instanceManager.destroyInstance(localEndpoint);
} catch (Throwable t2) {
ExceptionUtils.handleThrowable(t2);
if (throwable == null) {
throwable = t2;
}
}
}
t.setContextClassLoader(cl);
}
if (throwable != null) {
fireEndpointOnError(throwable);
}
}
private void fireEndpointOnError(Throwable throwable) {
// Fire the onError event
Thread t = Thread.currentThread();
ClassLoader cl = t.getContextClassLoader();
t.setContextClassLoader(applicationClassLoader);
try {
localEndpoint.onError(this, throwable);
} finally {
t.setContextClassLoader(cl);
}
}
private void sendCloseMessage(CloseReason closeReason) {
// 125 is maximum size for the payload of a control message
ByteBuffer msg = ByteBuffer.allocate(125);
CloseCode closeCode = closeReason.getCloseCode();
// CLOSED_ABNORMALLY should not be put on the wire
if (closeCode == CloseCodes.CLOSED_ABNORMALLY) {
// PROTOCOL_ERROR is probably better than GOING_AWAY here
msg.putShort((short) CloseCodes.PROTOCOL_ERROR.getCode());
} else {
msg.putShort((short) closeCode.getCode());
}
String reason = closeReason.getReasonPhrase();
if (reason != null && reason.length() > 0) {
appendCloseReasonWithTruncation(msg, reason);
}
msg.flip();
try {
wsRemoteEndpoint.startMessageBlock(Constants.OPCODE_CLOSE, msg, true);
} catch (IOException ioe) {
handleCloseException(ioe, closeCode);
} catch (WritePendingException wpe) {
handleCloseException(wpe, closeCode);
} finally {
webSocketContainer.unregisterSession(localEndpoint, this);
}
}
private void handleCloseException(Exception e, CloseCode closeCode) {
// Failed to send close message. Close the socket and let the caller
// deal with the Exception
if (log.isDebugEnabled()) {
log.debug(sm.getString("wsSession.sendCloseFail", id), e);
}
wsRemoteEndpoint.close();
// Failure to send a close message is not unexpected in the case of
// an abnormal closure (usually triggered by a failure to read/write
// from/to the client. In this case do not trigger the endpoint's
// error handling
if (closeCode != CloseCodes.CLOSED_ABNORMALLY) {
localEndpoint.onError(this, e);
}
}
/**
* Use protected so unit tests can access this method directly.
*/
protected static void appendCloseReasonWithTruncation(ByteBuffer msg,
String reason) {
// Once the close code has been added there are a maximum of 123 bytes
// left for the reason phrase. If it is truncated then care needs to be
// taken to ensure the bytes are not truncated in the middle of a
// multi-byte UTF-8 character.
byte[] reasonBytes = reason.getBytes(StandardCharsets.UTF_8);
if (reasonBytes.length <= 123) {
// No need to truncate
msg.put(reasonBytes);
} else {
// Need to truncate
int remaining = 123 - ELLIPSIS_BYTES_LEN;
int pos = 0;
byte[] bytesNext = reason.substring(pos, pos + 1).getBytes(
StandardCharsets.UTF_8);
while (remaining >= bytesNext.length) {
msg.put(bytesNext);
remaining -= bytesNext.length;
pos++;
bytesNext = reason.substring(pos, pos + 1).getBytes(
StandardCharsets.UTF_8);
}
msg.put(ELLIPSIS_BYTES);
}
}
/**
* Make the session aware of a {@link FutureToSendHandler} that will need to
* be forcibly closed if the session closes before the
* {@link FutureToSendHandler} completes.
*/
protected void registerFuture(FutureToSendHandler f2sh) {
// Ideally, this code should sync on stateLock so that the correct
// action is taken based on the current state of the connection.
// However, a sync on stateLock can't be used here as it will create the
// possibility of a dead-lock. See BZ 61183.
// Therefore, a slightly less efficient approach is used.
// Always register the future.
futures.put(f2sh, f2sh);
if (state == State.OPEN || f2sh.isCloseMessage()) {
// The session is open. The future has been registered with the open
// session. Normal processing continues.
return;
}
// The session is closed. The future may or may not have been registered
// in time for it to be processed during session closure.
if (f2sh.isDone()) {
// The future has completed. It is not known if the future was
// completed normally by the I/O layer or in error by doClose(). It
// doesn't matter which. There is nothing more to do here.
return;
}
// The session is closed. The Future had not completed when last checked.
// There is a small timing window that means the Future may have been
// completed since the last check. There is also the possibility that
// the Future was not registered in time to be cleaned up during session
// close.
// Attempt to complete the Future with an error result as this ensures
// that the Future completes and any client code waiting on it does not
// hang. It is slightly inefficient since the Future may have been
// completed in another thread or another thread may be about to
// complete the Future but knowing if this is the case requires the sync
// on stateLock (see above).
// Note: If multiple attempts are made to complete the Future, the
// second and subsequent attempts are ignored.
IOException ioe = new IOException(sm.getString("wsSession.messageFailed"));
SendResult sr = new SendResult(ioe);
f2sh.onResult(sr);
}
/**
* Remove a {@link FutureToSendHandler} from the set of tracked instances.
*/
protected void unregisterFuture(FutureToSendHandler f2sh) {
futures.remove(f2sh);
}
@Override
public URI getRequestURI() {
checkState();
return requestUri;
}
@Override
public Map> getRequestParameterMap() {
checkState();
return requestParameterMap;
}
@Override
public String getQueryString() {
checkState();
return queryString;
}
@Override
public Principal getUserPrincipal() {
checkState();
return userPrincipal;
}
@Override
public Map getPathParameters() {
checkState();
return pathParameters;
}
@Override
public String getId() {
return id;
}
@Override
public Map getUserProperties() {
checkState();
return userProperties;
}
public Endpoint getLocal() {
return localEndpoint;
}
public String getHttpSessionId() {
return httpSessionId;
}
protected MessageHandler getTextMessageHandler() {
return textMessageHandler;
}
protected MessageHandler getBinaryMessageHandler() {
return binaryMessageHandler;
}
protected MessageHandler.Whole getPongMessageHandler() {
return pongMessageHandler;
}
protected void updateLastActive() {
lastActive = System.currentTimeMillis();
}
protected void checkExpiration() {
long timeout = maxIdleTimeout;
if (timeout < 1) {
return;
}
if (System.currentTimeMillis() - lastActive > timeout) {
String msg = sm.getString("wsSession.timeout");
doClose(new CloseReason(CloseCodes.GOING_AWAY, msg),
new CloseReason(CloseCodes.CLOSED_ABNORMALLY, msg));
}
}
private void checkState() {
if (state == State.CLOSED) {
/*
* As per RFC 6455, a WebSocket connection is considered to be
* closed once a peer has sent and received a WebSocket close frame.
*/
throw new IllegalStateException(sm.getString("wsSession.closed", id));
}
}
private enum State {
OPEN,
OUTPUT_CLOSED,
CLOSED
}
}
