1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    * Permission is hereby granted, free of charge, to any person obtaining a copy
5    * of this software and associated documentation files (the "Software"), to deal
6    * in the Software without restriction, including without limitation the rights
7    * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8    * copies of the Software, and to permit persons to whom the Software is
9    * furnished to do so, subject to the following conditions:
10   *
11   * The above copyright notice and this permission notice shall be included in
12   * all copies or substantial portions of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  /**
24   * The contents of this file are subject to the terms of the Common Development
25   * and Distribution License (the License). You may not use this file except in
26   * compliance with the License.
27   *
28   * You can obtain a copy of the License at http://www.sun.com/cddl/cddl.html and
29   * legal/CDDLv1.0.txt. See the License for the specific language governing
30   * permission and limitations under the License.
31   *
32   * When distributing Covered Code, include this CDDL Header Notice in each file
33   * and include the License file at legal/CDDLv1.0.txt.
34   *
35   * If applicable, add the following below the CDDL Header, with the fields
36   * enclosed by brackets [] replaced by your own identifying information:
37   * "Portions Copyrighted [year] [name of copyright owner]"
38   *
39   * Copyright 2009 Sun Microsystems Inc. All rights reserved.
40   */
41  
42  package com.liferay.portal.servlet.filters.theme;
43  
44  import com.liferay.portal.kernel.servlet.StringServletResponse;
45  import com.liferay.portal.kernel.util.ParamUtil;
46  import com.liferay.portal.servlet.filters.BasePortalFilter;
47  import com.liferay.portal.servlet.filters.strip.StripFilter;
48  import com.liferay.portal.theme.ThemeDisplay;
49  import com.liferay.portal.util.WebKeys;
50  import com.liferay.util.servlet.ServletResponseUtil;
51  
52  import java.util.regex.Matcher;
53  import java.util.regex.Pattern;
54  
55  import javax.servlet.FilterChain;
56  import javax.servlet.http.HttpServletRequest;
57  import javax.servlet.http.HttpServletResponse;
58  
59  /**
60   * <a href="ThemePreviewFilter.java.html"><b><i>View Source</i></b></a>
61   *
62   * @author Ganesh Ram
63   */
64  public class ThemePreviewFilter extends BasePortalFilter {
65  
66      protected String getContent(HttpServletRequest request, String content) {
67          ThemeDisplay themeDisplay = (ThemeDisplay)request.getAttribute(
68              WebKeys.THEME_DISPLAY);
69  
70          Pattern cssPattern = Pattern.compile(
71              themeDisplay.getPathThemeCss());
72  
73          Matcher cssMatcher = cssPattern.matcher(content);
74  
75          content = cssMatcher.replaceAll("css");
76  
77          Pattern imagePattern = Pattern.compile(
78              themeDisplay.getPathThemeImages());
79  
80          Matcher imageMatcher = imagePattern.matcher(content);
81  
82          content = imageMatcher.replaceAll("images");
83  
84          return content;
85      }
86  
87      protected boolean isThemePreview(HttpServletRequest request) {
88          if (ParamUtil.getBoolean(request, _THEME_PREVIEW)) {
89              return true;
90          }
91          else {
92              return false;
93          }
94      }
95  
96      protected void processFilter(
97              HttpServletRequest request, HttpServletResponse response,
98              FilterChain filterChain)
99          throws Exception {
100 
101         if (isThemePreview(request)) {
102             request.setAttribute(StripFilter.SKIP_FILTER, Boolean.TRUE);
103 
104             StringServletResponse stringServerResponse =
105                 new StringServletResponse(response);
106 
107             processFilter(
108                 ThemePreviewFilter.class, request, stringServerResponse,
109                 filterChain);
110 
111             String content = getContent(
112                 request, stringServerResponse.getString());
113 
114             ServletResponseUtil.write(response, content);
115         }
116         else {
117             processFilter(
118                 ThemePreviewFilter.class, request, response, filterChain);
119         }
120     }
121 
122     private static final String _THEME_PREVIEW = "themePreview";
123 
124 }