A ServletFilter which adds the lang parameter to the requested URL
git-svn-id: https://svn.libreccm.org/ccm/trunk@4896 8810af33-2d31-482b-a856-94f89814c4dfmaster
jensp
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package com.arsdigita.bundle;
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import com.arsdigita.kernel.KernelConfig;
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import org.apache.log4j.Logger;
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import java.io.IOException;
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import javax.servlet.Filter;
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import javax.servlet.FilterChain;
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import javax.servlet.FilterConfig;
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import javax.servlet.ServletException;
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import javax.servlet.ServletRequest;
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import javax.servlet.ServletResponse;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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/**
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* A servlet filter which adds the {@code lang} parameter to the requested URL.
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* A the moment the same URL in CCM may point to different language variants of
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* content. This can be a problem when a cache like mod_cache is used. This
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* filter redirect the incoming request to an URL with the {@code lang} set to
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* the default language if the requested URL does not contain the {@code lang}
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* parameter.
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*
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* If the requested URL contains one of the following the filter does nothing:
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* <ul>
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* <li>/ccm/admin</li>
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* <li>/ccm/content-center</li>
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* <li>/themes</li>
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* <li>admin.jsp</li>
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* <li>item.jsp</li>
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* </ul>
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*
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* @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
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*/
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public class LanguageUrlFilter implements Filter {
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private static final Logger LOGGER = Logger.getLogger(
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LanguageUrlFilter.class);
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@Override
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public void init(final FilterConfig fc) throws ServletException {
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// Nothing
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}
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@Override
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public void doFilter(final ServletRequest request,
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final ServletResponse response,
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final FilterChain filterChain)
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throws IOException, ServletException {
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if (request instanceof HttpServletRequest) {
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final HttpServletRequest httpRequest = (HttpServletRequest) request;
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// if (!httpRequest.getRequestURI().contains("/navigation/")
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// && !httpRequest.getRequestURI()
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// .contains("/content-section/")
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// && !httpRequest.getRequestURI().contains("/profiles/")
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// && !httpRequest.getRequestURI().contains("/redirect/")) {
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//
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// filterChain.doFilter(request, response);
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// return;
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// }
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//
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// if (httpRequest.getRequestURI().contains("/content-section/")
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// && httpRequest.getRequestURI().contains("admin.jsp")) {
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//
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// filterChain.doFilter(request, response);
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// return;
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// }
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if (httpRequest.getRequestURI().contains("/ccm/admin")
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|| httpRequest.getRequestURI().contains(
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"/ccm/content-center")
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|| httpRequest.getRequestURI().contains("/themes/")
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|| httpRequest.getRequestURI().contains("admin.jsp")
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|| httpRequest.getRequestURI().contains("item.jsp")) {
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filterChain.doFilter(request, response);
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return;
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}
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final String queryString = httpRequest.getQueryString();
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if (queryString != null
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&& queryString.contains("lang=")) {
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LOGGER.debug("Request URI query string already contains lang "
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+ "parameter. Nothing to do.");
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filterChain.doFilter(request, response);
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} else {
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LOGGER.debug("Request URI query string does *not* contain lang"
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+ "parameter. Redirect to URL with language parameter set "
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+ "to default language.");
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final String defaultLang = KernelConfig
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.getConfig()
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.getDefaultLanguage();
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final StringBuilder redirectToUriBuilder = new StringBuilder();
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redirectToUriBuilder
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.append(httpRequest.getContextPath())
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.append(httpRequest.getServletPath())
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.append(httpRequest.getPathInfo());
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if (queryString == null || queryString.trim().isEmpty()) {
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redirectToUriBuilder.append("?lang=").append(defaultLang);
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} else {
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redirectToUriBuilder
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.append("?")
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.append(queryString)
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.append("&lang=")
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.append(defaultLang);
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}
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final String redirectToUri = redirectToUriBuilder.toString();
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LOGGER.debug(String.format("Redirecting to \"%s\"...",
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redirectToUri));
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((HttpServletResponse) response).sendRedirect(redirectToUri);
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// httpRequest
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// .getRequestDispatcher(redirectToUri)
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// .forward(request, response);
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// final StringBuilder redirectToUriBuffer = new StringBuilder();
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//// redirectToUriBuffer.append(httpRequest.getContextPath());
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// redirectToUriBuffer.append(httpRequest.getServletPath());
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// redirectToUriBuffer.append(redirectToPathInfo);
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// if (queryString == null
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// || queryString.trim().isEmpty()) {
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//
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// redirectToUriBuffer.append("?lang=").append(lang);
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// } else {
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// redirectToUriBuffer
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// .append(queryString)
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// .append("&lang=")
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// .append(lang);
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// }
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//
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// final String redirectToUri = redirectToUriBuffer
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// .toString()
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// .replace("//", "/");
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//
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// LOGGER.debug(String.format("Redirecting to \"%s\"...",
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// redirectToUri));
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// httpRequest
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// .getRequestDispatcher(redirectToUri)
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// .forward(request, response);
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// LOGGER.debug("Determing languge to use.");
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// final String pathInfo = httpRequest.getPathInfo();
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// final String lang;
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// final String redirectToPathInfo;
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// if (pathInfo != null && pathInfo.matches("(.*)\\.([a-zA-Z0-9])*")) {
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// final String languageExt = pathInfo
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// .substring(pathInfo.lastIndexOf("."),
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// pathInfo.length() - 1);
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// final String[] supportedLangs = KernelConfig
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// .getConfig().getSupportedLanguages().split(",");
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// redirectToPathInfo = pathInfo
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// .substring(0, pathInfo.lastIndexOf("."));
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// final boolean isSupported = Arrays
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// .binarySearch(supportedLangs, languageExt) != -1;
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//
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// if (isSupported) {
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// LOGGER.debug(String.format(
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// "Using language \"%s\" from language extension.",
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// languageExt));
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// lang = languageExt;
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// } else {
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// LOGGER.debug(String.format(
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// "Language \"%s\" is not supported. Using "
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// + "standard language.",
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// languageExt));
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// lang = KernelConfig.getConfig().getDefaultLanguage();
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// }
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// } else {
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// LOGGER.debug(
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// "No language extension, using standard language...");
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// lang = KernelConfig.getConfig().getDefaultLanguage();
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// redirectToPathInfo = pathInfo;
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// }
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//
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// final StringBuilder redirectToUriBuffer = new StringBuilder();
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//// redirectToUriBuffer.append(httpRequest.getContextPath());
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// redirectToUriBuffer.append(httpRequest.getServletPath());
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// redirectToUriBuffer.append(redirectToPathInfo);
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// if (queryString == null
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// || queryString.trim().isEmpty()) {
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//
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// redirectToUriBuffer.append("?lang=").append(lang);
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// } else {
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// redirectToUriBuffer
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// .append(queryString)
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// .append("&lang=")
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// .append(lang);
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// }
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//
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// final String redirectToUri = redirectToUriBuffer
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// .toString()
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// .replace("//", "/");
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//
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// LOGGER.debug(String.format("Redirecting to \"%s\"...",
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// redirectToUri));
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// httpRequest
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// .getRequestDispatcher(redirectToUri)
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// .forward(request, response);
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}
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} else {
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LOGGER.debug("Request is not a HttpServletRequest. Skiping filter.");
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filterChain.doFilter(request, response);
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}
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}
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@Override
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public void destroy() {
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// Nothing
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}
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}
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