001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018package org.apache.activemq.web;
019
020import java.io.IOException;
021import java.util.UUID;
022
023import javax.servlet.Filter;
024import javax.servlet.FilterChain;
025import javax.servlet.FilterConfig;
026import javax.servlet.ServletException;
027import javax.servlet.ServletRequest;
028import javax.servlet.ServletResponse;
029import javax.servlet.http.HttpServletRequest;
030import javax.servlet.http.HttpSession;
031
032/* ------------------------------------------------------------ */
033/**
034 * SessionFilter. Simple filter to ensure that all clients have a session.
035 * Prevents problems with AJAX requests.
036 */
037public class SessionFilter implements Filter {
038
039    public void init(FilterConfig filterConfig) throws ServletException {
040    }
041
042    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
043        // set secret to prevent CSRF attacks
044        ((HttpServletRequest)request).getSession(true).setAttribute("secret", UUID.randomUUID().toString());;
045        chain.doFilter(request, response);
046    }
047
048    public void destroy() {
049    }
050
051}