001/*
002 * Copyright 2002-2018 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.web.socket.server.standard;
018
019import java.io.IOException;
020import java.lang.reflect.Constructor;
021
022import javax.servlet.ServletException;
023import javax.servlet.http.HttpServletRequest;
024import javax.servlet.http.HttpServletResponse;
025
026import org.glassfish.tyrus.core.TyrusUpgradeResponse;
027import org.glassfish.tyrus.core.Utils;
028import org.glassfish.tyrus.servlet.TyrusHttpUpgradeHandler;
029import org.glassfish.tyrus.spi.WebSocketEngine.UpgradeInfo;
030import org.glassfish.tyrus.spi.Writer;
031
032import org.springframework.util.ReflectionUtils;
033import org.springframework.web.socket.server.HandshakeFailureException;
034
035/**
036 * A WebSocket {@code RequestUpgradeStrategy} for Oracle's GlassFish 4.1 and higher.
037 *
038 * @author Rossen Stoyanchev
039 * @author Juergen Hoeller
040 * @author Michael Irwin
041 * @since 4.0
042 */
043public class GlassFishRequestUpgradeStrategy extends AbstractTyrusRequestUpgradeStrategy {
044
045        private static final Constructor<?> constructor;
046
047        static {
048                try {
049                        ClassLoader classLoader = GlassFishRequestUpgradeStrategy.class.getClassLoader();
050                        Class<?> type = classLoader.loadClass("org.glassfish.tyrus.servlet.TyrusServletWriter");
051                        constructor = type.getDeclaredConstructor(TyrusHttpUpgradeHandler.class);
052                        ReflectionUtils.makeAccessible(constructor);
053                }
054                catch (Exception ex) {
055                        throw new IllegalStateException("No compatible Tyrus version found", ex);
056                }
057        }
058
059
060        @Override
061        protected void handleSuccess(HttpServletRequest request, HttpServletResponse response,
062                        UpgradeInfo upgradeInfo, TyrusUpgradeResponse upgradeResponse) throws IOException, ServletException {
063
064                TyrusHttpUpgradeHandler handler = request.upgrade(TyrusHttpUpgradeHandler.class);
065                Writer servletWriter = newServletWriter(handler);
066                handler.preInit(upgradeInfo, servletWriter, request.getUserPrincipal() != null);
067
068                response.setStatus(upgradeResponse.getStatus());
069                upgradeResponse.getHeaders().forEach((key, value) -> response.addHeader(key, Utils.getHeaderFromList(value)));
070                response.flushBuffer();
071        }
072
073        private Writer newServletWriter(TyrusHttpUpgradeHandler handler) {
074                try {
075                        return (Writer) constructor.newInstance(handler);
076                }
077                catch (Exception ex) {
078                        throw new HandshakeFailureException("Failed to instantiate TyrusServletWriter", ex);
079                }
080        }
081
082}