org.apache.tomcat.websocket.server.WsServerContainer Maven / Gradle / Ivy
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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.server;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collections;
import java.util.EnumSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ConcurrentSkipListMap;
import javax.naming.NamingException;
import javax.servlet.DispatcherType;
import javax.servlet.FilterRegistration;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.websocket.CloseReason;
import javax.websocket.CloseReason.CloseCodes;
import javax.websocket.DeploymentException;
import javax.websocket.Encoder;
import javax.websocket.server.ServerContainer;
import javax.websocket.server.ServerEndpoint;
import javax.websocket.server.ServerEndpointConfig;
import javax.websocket.server.ServerEndpointConfig.Configurator;
import org.apache.tomcat.InstanceManager;
import org.apache.tomcat.util.res.StringManager;
import org.apache.tomcat.websocket.WsSession;
import org.apache.tomcat.websocket.WsWebSocketContainer;
import org.apache.tomcat.websocket.pojo.PojoMethodMapping;
/**
* Provides a per class loader (i.e. per web application) instance of a ServerContainer. Web application wide defaults
* may be configured by setting the following servlet context initialisation parameters to the desired values.
*
* - {@link Constants#BINARY_BUFFER_SIZE_SERVLET_CONTEXT_INIT_PARAM}
* - {@link Constants#TEXT_BUFFER_SIZE_SERVLET_CONTEXT_INIT_PARAM}
*
*/
public class WsServerContainer extends WsWebSocketContainer implements ServerContainer {
private static final StringManager sm = StringManager.getManager(WsServerContainer.class);
private static final CloseReason AUTHENTICATED_HTTP_SESSION_CLOSED = new CloseReason(CloseCodes.VIOLATED_POLICY,
"This connection was established under an authenticated " + "HTTP session that has ended.");
private final WsWriteTimeout wsWriteTimeout = new WsWriteTimeout();
private final ServletContext servletContext;
private final Map configExactMatchMap = new ConcurrentHashMap<>();
private final ConcurrentMap> configTemplateMatchMap = new ConcurrentHashMap<>();
private volatile boolean enforceNoAddAfterHandshake = org.apache.tomcat.websocket.Constants.STRICT_SPEC_COMPLIANCE;
private volatile boolean addAllowed = true;
private final ConcurrentMap> authenticatedSessions = new ConcurrentHashMap<>();
private volatile boolean endpointsRegistered = false;
private volatile boolean deploymentFailed = false;
WsServerContainer(ServletContext servletContext) {
this.servletContext = servletContext;
setInstanceManager((InstanceManager) servletContext.getAttribute(InstanceManager.class.getName()));
// Configure servlet context wide defaults
String value = servletContext.getInitParameter(Constants.BINARY_BUFFER_SIZE_SERVLET_CONTEXT_INIT_PARAM);
if (value != null) {
setDefaultMaxBinaryMessageBufferSize(Integer.parseInt(value));
}
value = servletContext.getInitParameter(Constants.TEXT_BUFFER_SIZE_SERVLET_CONTEXT_INIT_PARAM);
if (value != null) {
setDefaultMaxTextMessageBufferSize(Integer.parseInt(value));
}
value = servletContext.getInitParameter(Constants.ENFORCE_NO_ADD_AFTER_HANDSHAKE_CONTEXT_INIT_PARAM);
if (value != null) {
setEnforceNoAddAfterHandshake(Boolean.parseBoolean(value));
}
FilterRegistration.Dynamic fr = servletContext.addFilter("Tomcat WebSocket (JSR356) Filter", new WsFilter());
if (fr != null) {
fr.setAsyncSupported(true);
EnumSet types = EnumSet.of(DispatcherType.REQUEST, DispatcherType.FORWARD);
fr.addMappingForUrlPatterns(types, true, "/*");
}
}
/**
* Published the provided endpoint implementation at the specified path with the specified configuration.
* {@link #WsServerContainer(ServletContext)} must be called before calling this method.
*
* @param sec The configuration to use when creating endpoint instances
*
* @throws DeploymentException if the endpoint cannot be published as requested
*/
@Override
public void addEndpoint(ServerEndpointConfig sec) throws DeploymentException {
addEndpoint(sec, false);
}
void addEndpoint(ServerEndpointConfig sec, boolean fromAnnotatedPojo) throws DeploymentException {
if (enforceNoAddAfterHandshake && !addAllowed) {
throw new DeploymentException(sm.getString("serverContainer.addNotAllowed"));
}
if (servletContext == null) {
throw new DeploymentException(sm.getString("serverContainer.servletContextMissing"));
}
if (deploymentFailed) {
throw new DeploymentException(sm.getString("serverContainer.failedDeployment",
servletContext.getContextPath(), servletContext.getVirtualServerName()));
}
try {
String path = sec.getPath();
// Add method mapping to user properties
PojoMethodMapping methodMapping = new PojoMethodMapping(sec.getEndpointClass(), sec.getDecoders(), path,
getInstanceManager(Thread.currentThread().getContextClassLoader()));
if (methodMapping.getOnClose() != null || methodMapping.getOnOpen() != null ||
methodMapping.getOnError() != null || methodMapping.hasMessageHandlers()) {
sec.getUserProperties().put(org.apache.tomcat.websocket.pojo.Constants.POJO_METHOD_MAPPING_KEY,
methodMapping);
}
UriTemplate uriTemplate = new UriTemplate(path);
if (uriTemplate.hasParameters()) {
Integer key = Integer.valueOf(uriTemplate.getSegmentCount());
ConcurrentSkipListMap templateMatches = configTemplateMatchMap.get(key);
if (templateMatches == null) {
// Ensure that if concurrent threads execute this block they
// all end up using the same ConcurrentSkipListMap instance
templateMatches = new ConcurrentSkipListMap<>();
configTemplateMatchMap.putIfAbsent(key, templateMatches);
templateMatches = configTemplateMatchMap.get(key);
}
TemplatePathMatch newMatch = new TemplatePathMatch(sec, uriTemplate, fromAnnotatedPojo);
TemplatePathMatch oldMatch = templateMatches.putIfAbsent(uriTemplate.getNormalizedPath(), newMatch);
if (oldMatch != null) {
// Note: This depends on Endpoint instances being added
// before POJOs in WsSci#onStartup()
if (oldMatch.isFromAnnotatedPojo() && !newMatch.isFromAnnotatedPojo() &&
oldMatch.getConfig().getEndpointClass() == newMatch.getConfig().getEndpointClass()) {
// The WebSocket spec says to ignore the new match in this case
templateMatches.put(path, oldMatch);
} else {
// Duplicate uriTemplate;
throw new DeploymentException(sm.getString("serverContainer.duplicatePaths", path,
sec.getEndpointClass(), sec.getEndpointClass()));
}
}
} else {
// Exact match
ExactPathMatch newMatch = new ExactPathMatch(sec, fromAnnotatedPojo);
ExactPathMatch oldMatch = configExactMatchMap.put(path, newMatch);
if (oldMatch != null) {
// Note: This depends on Endpoint instances being added
// before POJOs in WsSci#onStartup()
if (oldMatch.isFromAnnotatedPojo() && !newMatch.isFromAnnotatedPojo() &&
oldMatch.getConfig().getEndpointClass() == newMatch.getConfig().getEndpointClass()) {
// The WebSocket spec says to ignore the new match in this case
configExactMatchMap.put(path, oldMatch);
} else {
// Duplicate path mappings
throw new DeploymentException(sm.getString("serverContainer.duplicatePaths", path,
oldMatch.getConfig().getEndpointClass(), sec.getEndpointClass()));
}
}
}
endpointsRegistered = true;
} catch (DeploymentException de) {
failDeployment();
throw de;
}
}
/**
* Provides the equivalent of {@link #addEndpoint(ServerEndpointConfig)} for publishing plain old java objects
* (POJOs) that have been annotated as WebSocket endpoints.
*
* @param pojo The annotated POJO
*/
@Override
public void addEndpoint(Class pojo) throws DeploymentException {
addEndpoint(pojo, false);
}
void addEndpoint(Class pojo, boolean fromAnnotatedPojo) throws DeploymentException {
if (deploymentFailed) {
throw new DeploymentException(sm.getString("serverContainer.failedDeployment",
servletContext.getContextPath(), servletContext.getVirtualServerName()));
}
ServerEndpointConfig sec;
try {
ServerEndpoint annotation = pojo.getAnnotation(ServerEndpoint.class);
if (annotation == null) {
throw new DeploymentException(sm.getString("serverContainer.missingAnnotation", pojo.getName()));
}
String path = annotation.value();
// Validate encoders
validateEncoders(annotation.encoders(), getInstanceManager(Thread.currentThread().getContextClassLoader()));
// ServerEndpointConfig
Class configuratorClazz = annotation.configurator();
Configurator configurator = null;
if (!configuratorClazz.equals(Configurator.class)) {
try {
configurator = annotation.configurator().getConstructor().newInstance();
} catch (ReflectiveOperationException e) {
throw new DeploymentException(sm.getString("serverContainer.configuratorFail",
annotation.configurator().getName(), pojo.getClass().getName()), e);
}
}
sec = ServerEndpointConfig.Builder.create(pojo, path).decoders(Arrays.asList(annotation.decoders()))
.encoders(Arrays.asList(annotation.encoders()))
.subprotocols(Arrays.asList(annotation.subprotocols())).configurator(configurator).build();
} catch (DeploymentException de) {
failDeployment();
throw de;
}
addEndpoint(sec, fromAnnotatedPojo);
}
void failDeployment() {
deploymentFailed = true;
// Clear all existing deployments
endpointsRegistered = false;
configExactMatchMap.clear();
configTemplateMatchMap.clear();
}
boolean areEndpointsRegistered() {
return endpointsRegistered;
}
/**
* Until the WebSocket specification provides such a mechanism, this Tomcat proprietary method is provided to enable
* applications to programmatically determine whether or not to upgrade an individual request to WebSocket.
*
* Note: This method is not used by Tomcat but is used directly by third-party code and must not be removed.
*
* @param request The request object to be upgraded
* @param response The response object to be populated with the result of the upgrade
* @param sec The server endpoint to use to process the upgrade request
* @param pathParams The path parameters associated with the upgrade request
*
* @throws ServletException If a configuration error prevents the upgrade from taking place
* @throws IOException If an I/O error occurs during the upgrade process
*
* @deprecated This method will be removed in Apache Tomcat 10.1 onwards. It has been replaced by
* {@link #upgradeHttpToWebSocket(Object, Object, ServerEndpointConfig, Map)}
*/
@Deprecated
public void doUpgrade(HttpServletRequest request, HttpServletResponse response, ServerEndpointConfig sec,
Map pathParams) throws ServletException, IOException {
UpgradeUtil.doUpgrade(this, request, response, sec, pathParams);
}
/**
* Upgrade the HTTP connection represented by the {@code HttpServletRequest} and {@code HttpServletResponse} to the
* WebSocket protocol and establish a WebSocket connection as per the provided {@link ServerEndpointConfig}.
*
* This method is primarily intended to be used by frameworks that implement the front-controller pattern. It does
* not deploy the provided endpoint.
*
* If the WebSocket implementation is not deployed as part of a Jakarta Servlet container, this method will throw an
* {@link UnsupportedOperationException}.
*
* This method will be part of the Jakarta WebSocket API from version 2.1
*
* @param httpServletRequest The {@code HttpServletRequest} to be processed as a WebSocket handshake as per section
* 4.0 of RFC 6455.
* @param httpServletResponse The {@code HttpServletResponse} to be used when processing the
* {@code httpServletRequest} as a WebSocket handshake as per section 4.0 of RFC
* 6455.
* @param sec The server endpoint configuration to use to configure the WebSocket endpoint
* @param pathParameters Provides a mapping of path parameter names and values, if any, to be used for the
* WebSocket connection established by the call to this method. If no such mapping is
* defined, an empty Map must be passed.
*
* @throws IllegalStateException if the provided request does not meet the requirements of the WebSocket
* handshake
* @throws UnsupportedOperationException if the WebSocket implementation is not deployed as part of a Jakarta
* Servlet container
* @throws IOException if an I/O error occurs during the establishment of a WebSocket connection
* @throws DeploymentException if a configuration error prevents the establishment of a WebSocket
* connection
*/
public void upgradeHttpToWebSocket(Object httpServletRequest, Object httpServletResponse, ServerEndpointConfig sec,
Map pathParameters) throws IOException, DeploymentException {
try {
UpgradeUtil.doUpgrade(this, (HttpServletRequest) httpServletRequest,
(HttpServletResponse) httpServletResponse, sec, pathParameters);
} catch (ServletException e) {
throw new DeploymentException(e.getMessage(), e);
}
}
public WsMappingResult findMapping(String path) {
// Prevent registering additional endpoints once the first attempt has
// been made to use one
if (addAllowed) {
addAllowed = false;
}
// Check an exact match. Simple case as there are no templates.
ExactPathMatch match = configExactMatchMap.get(path);
if (match != null) {
return new WsMappingResult(match.getConfig(), Collections.emptyMap());
}
// No exact match. Need to look for template matches.
UriTemplate pathUriTemplate = null;
try {
pathUriTemplate = new UriTemplate(path);
} catch (DeploymentException e) {
// Path is not valid so can't be matched to a WebSocketEndpoint
return null;
}
// Number of segments has to match
Integer key = Integer.valueOf(pathUriTemplate.getSegmentCount());
ConcurrentSkipListMap templateMatches = configTemplateMatchMap.get(key);
if (templateMatches == null) {
// No templates with an equal number of segments so there will be
// no matches
return null;
}
// List is in alphabetical order of normalised templates.
// Correct match is the first one that matches.
ServerEndpointConfig sec = null;
Map pathParams = null;
for (TemplatePathMatch templateMatch : templateMatches.values()) {
pathParams = templateMatch.getUriTemplate().match(pathUriTemplate);
if (pathParams != null) {
sec = templateMatch.getConfig();
break;
}
}
if (sec == null) {
// No match
return null;
}
return new WsMappingResult(sec, pathParams);
}
public boolean isEnforceNoAddAfterHandshake() {
return enforceNoAddAfterHandshake;
}
public void setEnforceNoAddAfterHandshake(boolean enforceNoAddAfterHandshake) {
this.enforceNoAddAfterHandshake = enforceNoAddAfterHandshake;
}
protected WsWriteTimeout getTimeout() {
return wsWriteTimeout;
}
/**
* {@inheritDoc} Overridden to make it visible to other classes in this package.
*/
@Override
protected InstanceManager getInstanceManager(ClassLoader classLoader) {
return super.getInstanceManager(classLoader);
}
/**
* {@inheritDoc} Overridden to make it visible to other classes in this package.
*/
@Override
protected void registerSession(Object key, WsSession wsSession) {
super.registerSession(key, wsSession);
if (wsSession.isOpen() && wsSession.getUserPrincipal() != null && wsSession.getHttpSessionId() != null) {
registerAuthenticatedSession(wsSession, wsSession.getHttpSessionId());
}
}
/**
* {@inheritDoc} Overridden to make it visible to other classes in this package.
*/
@Override
protected void unregisterSession(Object key, WsSession wsSession) {
if (wsSession.getUserPrincipal() != null && wsSession.getHttpSessionId() != null) {
unregisterAuthenticatedSession(wsSession, wsSession.getHttpSessionId());
}
super.unregisterSession(key, wsSession);
}
private void registerAuthenticatedSession(WsSession wsSession, String httpSessionId) {
Set wsSessions = authenticatedSessions.get(httpSessionId);
if (wsSessions == null) {
wsSessions = Collections.newSetFromMap(new ConcurrentHashMap());
authenticatedSessions.putIfAbsent(httpSessionId, wsSessions);
wsSessions = authenticatedSessions.get(httpSessionId);
}
wsSessions.add(wsSession);
}
private void unregisterAuthenticatedSession(WsSession wsSession, String httpSessionId) {
Set wsSessions = authenticatedSessions.get(httpSessionId);
// wsSessions will be null if the HTTP session has ended
if (wsSessions != null) {
wsSessions.remove(wsSession);
}
}
public void closeAuthenticatedSession(String httpSessionId) {
Set wsSessions = authenticatedSessions.remove(httpSessionId);
if (wsSessions != null && !wsSessions.isEmpty()) {
for (WsSession wsSession : wsSessions) {
try {
wsSession.close(AUTHENTICATED_HTTP_SESSION_CLOSED);
} catch (IOException e) {
// Any IOExceptions during close will have been caught and the
// onError method called.
}
}
}
}
private static void validateEncoders(Class[] encoders, InstanceManager instanceManager)
throws DeploymentException {
for (Class encoder : encoders) {
// Need to instantiate encoder to ensure it is valid and that
// deployment can be failed if it is not. The encoder is then
// discarded immediately.
Encoder instance;
try {
if (instanceManager == null) {
instance = encoder.getConstructor().newInstance();
} else {
instance = (Encoder) instanceManager.newInstance(encoder);
instanceManager.destroyInstance(instance);
}
} catch (ReflectiveOperationException | NamingException e) {
throw new DeploymentException(sm.getString("serverContainer.encoderFail", encoder.getName()), e);
}
}
}
private static class TemplatePathMatch {
private final ServerEndpointConfig config;
private final UriTemplate uriTemplate;
private final boolean fromAnnotatedPojo;
TemplatePathMatch(ServerEndpointConfig config, UriTemplate uriTemplate, boolean fromAnnotatedPojo) {
this.config = config;
this.uriTemplate = uriTemplate;
this.fromAnnotatedPojo = fromAnnotatedPojo;
}
public ServerEndpointConfig getConfig() {
return config;
}
public UriTemplate getUriTemplate() {
return uriTemplate;
}
public boolean isFromAnnotatedPojo() {
return fromAnnotatedPojo;
}
}
private static class ExactPathMatch {
private final ServerEndpointConfig config;
private final boolean fromAnnotatedPojo;
ExactPathMatch(ServerEndpointConfig config, boolean fromAnnotatedPojo) {
this.config = config;
this.fromAnnotatedPojo = fromAnnotatedPojo;
}
public ServerEndpointConfig getConfig() {
return config;
}
public boolean isFromAnnotatedPojo() {
return fromAnnotatedPojo;
}
}
}