/*
* Copyright 2015 JBoss, by Red Hat, Inc
*
* 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.
*/
package org.uberfire.ext.security.server;
import java.io.IOException;
import java.util.Calendar;
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 CacheHeadersFilter implements Filter {
static final String EXPIRES_HEADER = "Expires";
static final String CACHE_CONTROL_HEADER = "Cache-Control";
static final String PRAGMA_HEADER = "Pragma";
static final int YEAR_IN_SECONDS = 365 * 24 * 60 * 60;
@Override
public void init(final FilterConfig filterConfig) throws ServletException {
}
@Override
public void destroy() {
}
@Override
public void doFilter(final ServletRequest request,
final ServletResponse response,
final FilterChain chain) throws IOException, ServletException {
final HttpServletRequest httpServletRequest = (HttpServletRequest) request;
final HttpServletResponse httpServletResponse = (HttpServletResponse) response;
final String requestURI = httpServletRequest.getRequestURI();
if (requestURI.contains(".cache.")) {
final Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.SECOND,
YEAR_IN_SECONDS);
httpServletResponse.setHeader(CACHE_CONTROL_HEADER,
"max-age=" + YEAR_IN_SECONDS + ", must-revalidate");
httpServletResponse.setDateHeader(EXPIRES_HEADER,
calendar.getTime().getTime());
} else if (requestURI.endsWith(".nocache.js") || (requestURI.endsWith(".html"))) {
httpServletResponse.setHeader(CACHE_CONTROL_HEADER,
"no-cache, no-store, must-revalidate");
httpServletResponse.setHeader(PRAGMA_HEADER,
"no-cache");
httpServletResponse.setDateHeader(EXPIRES_HEADER,
0);
}
chain.doFilter(request,
response);
}
}