package com.howgoodiwas.util;
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;
import javax.servlet.http.HttpServletResponseWrapper;
/**
* Servlet filter which disables URL-encoded session identifiers.
*
*
* Copyright (c) 2006, Craig Condit. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* Modified by Devon Hillard (devon@digitalsanctuary.com) to only filter for GoogleBot,
* not for users without cookies enabled.
*
*/
@SuppressWarnings("deprecation")
public class DisableUrlSessionFilter implements Filter {
/**
* The string to look for in the User-Agent header to identify the GoogleBot.
*/
private static final String GOOGLEBOT_AGENT_STRING = "googlebot";
/**
* The request header with the User-Agent information in it.
*/
private static final String USER_AGENT_HEADER_NAME = "User-Agent";
/**
* Filters requests to disable URL-based session identifiers.
*
* @param pRequest
* the request
* @param pResponse
* the response
* @param pChain
* the chain
*
* @throws IOException
* Signals that an I/O exception has occurred.
* @throws ServletException
* the servlet exception
*/
public void doFilter(final ServletRequest pRequest, final ServletResponse pResponse, final FilterChain pChain)
throws IOException, ServletException {
// skip non-http requests
if (!(pRequest instanceof HttpServletRequest)) {
pChain.doFilter(pRequest, pResponse);
return;
}
HttpServletRequest httpRequest = (HttpServletRequest) pRequest;
HttpServletResponse httpResponse = (HttpServletResponse) pResponse;
boolean isGoogleBot = false;
if (httpRequest != null) {
String userAgent = httpRequest.getHeader(USER_AGENT_HEADER_NAME);
if (StringUtils.isNotBlank(userAgent)) {
if (userAgent.toLowerCase().indexOf(GOOGLEBOT_AGENT_STRING) > -1) {
isGoogleBot = true;
}
}
}
if (isGoogleBot) {
// wrap response to remove URL encoding
HttpServletResponseWrapper wrappedResponse = new HttpServletResponseWrapper(httpResponse) {
@Override
public String encodeRedirectUrl(final String url) {
return url;
}
@Override
public String encodeRedirectURL(final String url) {
return url;
}
@Override
public String encodeUrl(final String url) {
return url;
}
@Override
public String encodeURL(final String url) {
return url;
}
};
// process next request in chain
pChain.doFilter(pRequest, wrappedResponse);
} else {
pChain.doFilter(pRequest, pResponse);
}
}
/**
* Unused.
*
* @param pConfig
* the config
*
* @throws ServletException
* the servlet exception
*/
public void init(final FilterConfig pConfig) throws ServletException {
}
/**
* Unused.
*/
public void destroy() {
}
}
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