| /* |
| * 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 javax.servlet.Filter; |
| import javax.servlet.FilterChain; |
| import javax.servlet.FilterConfig; |
| import javax.servlet.ServletException; |
| import javax.servlet.ServletRequest; |
| import javax.servlet.ServletResponse; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| |
| /** |
| * Handles the initial HTTP connection for WebSocket connections. |
| */ |
| public class WsFilter implements Filter { |
| |
| private WsServerContainer sc; |
| |
| |
| @Override |
| public void init(FilterConfig filterConfig) throws ServletException { |
| sc = (WsServerContainer) filterConfig.getServletContext().getAttribute( |
| Constants.SERVER_CONTAINER_SERVLET_CONTEXT_ATTRIBUTE); |
| } |
| |
| |
| @Override |
| public void doFilter(ServletRequest request, ServletResponse response, |
| FilterChain chain) throws IOException, ServletException { |
| |
| // This filter only needs to handle WebSocket upgrade requests |
| if (!sc.areEndpointsRegistered() || |
| !UpgradeUtil.isWebSocketUpgradeRequest(request, response)) { |
| chain.doFilter(request, response); |
| return; |
| } |
| |
| // HTTP request with an upgrade header for WebSocket present |
| HttpServletRequest req = (HttpServletRequest) request; |
| HttpServletResponse resp = (HttpServletResponse) response; |
| |
| // Check to see if this WebSocket implementation has a matching mapping |
| String path; |
| String pathInfo = req.getPathInfo(); |
| if (pathInfo == null) { |
| path = req.getServletPath(); |
| } else { |
| path = req.getServletPath() + pathInfo; |
| } |
| WsMappingResult mappingResult = sc.findMapping(path); |
| |
| if (mappingResult == null) { |
| // No endpoint registered for the requested path. Let the |
| // application handle it (it might redirect or forward for example) |
| chain.doFilter(request, response); |
| return; |
| } |
| |
| UpgradeUtil.doUpgrade(sc, req, resp, mappingResult.getConfig(), |
| mappingResult.getPathParams()); |
| } |
| |
| |
| @Override |
| public void destroy() { |
| // NO-OP |
| } |
| |
| |
| } |