/*
* #%L
* BroadleafCommerce Common Libraries
* %%
* Copyright (C) 2009 - 2013 Broadleaf Commerce
* %%
* Licensed 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.
* #L%
*/
package org.broadleafcommerce.common.web.util;
import org.broadleafcommerce.common.util.BLCRequestUtils;
import org.broadleafcommerce.common.web.BroadleafRequestContext;
import org.springframework.web.context.request.ServletWebRequest;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
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;
public class RepeatSubmitProtectionFilter implements Filter {
private final Map<String, List<String>> requests = new HashMap<String, List<String>>(100);
@Override
public void destroy() {
//do nothing
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
boolean useSession = true;
if (BroadleafRequestContext.getBroadleafRequestContext() != null
&& BroadleafRequestContext.getBroadleafRequestContext().getWebRequest() != null) {
if (!BLCRequestUtils.isOKtoUseSession(BroadleafRequestContext.getBroadleafRequestContext().getWebRequest())) {
useSession = false;
}
} else if (!BLCRequestUtils.isOKtoUseSession(new ServletWebRequest((HttpServletRequest) request))) {
useSession = false;
}
if (useSession) {
String sessionId;
String requestURI;
synchronized(requests) {
sessionId = ((HttpServletRequest) request).getSession().getId();
requestURI = ((HttpServletRequest) request).getRequestURI();
if (requests.containsKey(sessionId) && requests.get(sessionId).contains(requestURI)) {
//we are currently already processing this request
((HttpServletResponse) response).setStatus(HttpServletResponse.SC_NO_CONTENT);
return;
}
List<String> myRequests = requests.get(sessionId);
if (myRequests == null) {
myRequests = new ArrayList<String>();
requests.put(sessionId, myRequests);
}
myRequests.add(requestURI);
}
try {
chain.doFilter(request, response);
} finally {
synchronized (requests) {
List<String> myRequests = requests.get(sessionId);
myRequests.remove(requestURI);
if (myRequests.isEmpty()) {
requests.remove(sessionId);
}
}
}
} else {
chain.doFilter(request, response);
}
}
@Override
public void init(FilterConfig arg0) throws ServletException {
//do nothing
}
}