001    /**
002     * Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.servlet.filters.themepreview;
016    
017    import com.liferay.portal.kernel.servlet.ServletResponseUtil;
018    import com.liferay.portal.kernel.servlet.StringServletResponse;
019    import com.liferay.portal.kernel.util.ParamUtil;
020    import com.liferay.portal.servlet.filters.BasePortalFilter;
021    import com.liferay.portal.servlet.filters.strip.StripFilter;
022    import com.liferay.portal.theme.ThemeDisplay;
023    import com.liferay.portal.util.WebKeys;
024    
025    import java.util.regex.Matcher;
026    import java.util.regex.Pattern;
027    
028    import javax.servlet.FilterChain;
029    import javax.servlet.http.HttpServletRequest;
030    import javax.servlet.http.HttpServletResponse;
031    
032    /**
033     * @author Ganesh Ram
034     */
035    public class ThemePreviewFilter extends BasePortalFilter {
036    
037            @Override
038            public boolean isFilterEnabled(
039                    HttpServletRequest request, HttpServletResponse response) {
040    
041                    if (isThemePreview(request)) {
042                            return true;
043                    }
044                    else {
045                            return false;
046                    }
047            }
048    
049            protected String getContent(HttpServletRequest request, String content) {
050                    ThemeDisplay themeDisplay = (ThemeDisplay)request.getAttribute(
051                            WebKeys.THEME_DISPLAY);
052    
053                    Pattern cssPattern = Pattern.compile(themeDisplay.getPathThemeCss());
054    
055                    Matcher cssMatcher = cssPattern.matcher(content);
056    
057                    content = cssMatcher.replaceAll("css");
058    
059                    Pattern imagePattern = Pattern.compile(
060                            themeDisplay.getPathThemeImages());
061    
062                    Matcher imageMatcher = imagePattern.matcher(content);
063    
064                    content = imageMatcher.replaceAll("images");
065    
066                    return content;
067            }
068    
069            protected boolean isThemePreview(HttpServletRequest request) {
070                    if (ParamUtil.getBoolean(request, _THEME_PREVIEW)) {
071                            return true;
072                    }
073                    else {
074                            return false;
075                    }
076            }
077    
078            @Override
079            protected void processFilter(
080                            HttpServletRequest request, HttpServletResponse response,
081                            FilterChain filterChain)
082                    throws Exception {
083    
084                    request.setAttribute(StripFilter.SKIP_FILTER, Boolean.TRUE);
085    
086                    StringServletResponse stringServerResponse = new StringServletResponse(
087                            response);
088    
089                    processFilter(
090                            ThemePreviewFilter.class, request, stringServerResponse,
091                            filterChain);
092    
093                    String content = getContent(request, stringServerResponse.getString());
094    
095                    ServletResponseUtil.write(response, content);
096            }
097    
098            private static final String _THEME_PREVIEW = "themePreview";
099    
100    }