importjavax.servlet.*;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;importjavax.servlet.http.HttpServletResponseWrapper;importjavax.servlet.http.HttpSession;importjava.io.IOException;/*** 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.
*
*/@SuppressWarnings("deprecation")publicclassDisableUrlSessionFilterimplementsFilter {/*** Filters requests to disable URL-based session identifiers.*/publicvoiddoFilter(ServletRequest request, ServletResponse response, FilterChain chain)throwsIOException, ServletException {//skip non-http requestsif(!(requestinstanceofHttpServletRequest)) {
chain.doFilter(request, response);return;
}
HttpServletRequest httpRequest=(HttpServletRequest) request;
HttpServletResponse httpResponse=(HttpServletResponse) response;//clear session if session id in URLif(httpRequest.isRequestedSessionIdFromURL()) {
HttpSession session=httpRequest.getSession();if(session!=null) session.invalidate();
}//wrap response to remove URL encodingHttpServletResponseWrapper wrappedResponse=newHttpServletResponseWrapper(httpResponse) {
@OverridepublicString encodeRedirectUrl(String url) {returnurl;
}
@OverridepublicString encodeRedirectURL(String url) {returnurl;
}
@OverridepublicString encodeUrl(String url) {returnurl;
}
@OverridepublicString encodeURL(String url) {returnurl;
}
};//process next request in chainchain.doFilter(request, wrappedResponse);
}/*** Unused.*/publicvoidinit(FilterConfig config)throwsServletException {
}/*** Unused.*/publicvoiddestroy() {
}
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