001/*
002 * Copyright 2012-2017 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 *      http://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.boot.devtools.remote.server;
018
019import java.io.IOException;
020
021import javax.servlet.Filter;
022import javax.servlet.FilterChain;
023import javax.servlet.FilterConfig;
024import javax.servlet.ServletException;
025import javax.servlet.ServletRequest;
026import javax.servlet.ServletResponse;
027import javax.servlet.http.HttpServletRequest;
028import javax.servlet.http.HttpServletResponse;
029
030import org.springframework.http.server.ServerHttpRequest;
031import org.springframework.http.server.ServerHttpResponse;
032import org.springframework.http.server.ServletServerHttpRequest;
033import org.springframework.http.server.ServletServerHttpResponse;
034import org.springframework.util.Assert;
035
036/**
037 * Servlet filter providing integration with the remote server {@link Dispatcher}.
038 *
039 * @author Phillip Webb
040 * @author Rob Winch
041 * @since 1.3.0
042 */
043public class DispatcherFilter implements Filter {
044
045        private final Dispatcher dispatcher;
046
047        public DispatcherFilter(Dispatcher dispatcher) {
048                Assert.notNull(dispatcher, "Dispatcher must not be null");
049                this.dispatcher = dispatcher;
050        }
051
052        @Override
053        public void init(FilterConfig filterConfig) throws ServletException {
054        }
055
056        @Override
057        public void doFilter(ServletRequest request, ServletResponse response,
058                        FilterChain chain) throws IOException, ServletException {
059                if (request instanceof HttpServletRequest
060                                && response instanceof HttpServletResponse) {
061                        doFilter((HttpServletRequest) request, (HttpServletResponse) response, chain);
062                }
063                else {
064                        chain.doFilter(request, response);
065                }
066        }
067
068        private void doFilter(HttpServletRequest request, HttpServletResponse response,
069                        FilterChain chain) throws IOException, ServletException {
070                ServerHttpRequest serverRequest = new ServletServerHttpRequest(request);
071                ServerHttpResponse serverResponse = new ServletServerHttpResponse(response);
072                if (!this.dispatcher.handle(serverRequest, serverResponse)) {
073                        chain.doFilter(request, response);
074                }
075        }
076
077        @Override
078        public void destroy() {
079        }
080
081}