001    /**
002     * Copyright (c) 2000-2010 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.language;
016    
017    import com.liferay.portal.kernel.language.LanguageUtil;
018    import com.liferay.portal.kernel.language.UnicodeLanguageUtil;
019    import com.liferay.portal.kernel.log.Log;
020    import com.liferay.portal.kernel.log.LogFactoryUtil;
021    import com.liferay.portal.kernel.servlet.PortletServlet;
022    import com.liferay.portal.kernel.servlet.StringServletResponse;
023    import com.liferay.portal.kernel.util.HttpUtil;
024    import com.liferay.portal.kernel.util.LocaleUtil;
025    import com.liferay.portal.kernel.util.StringBundler;
026    import com.liferay.portal.kernel.util.StringPool;
027    import com.liferay.portal.model.Portlet;
028    import com.liferay.portal.model.PortletApp;
029    import com.liferay.portal.servlet.filters.BasePortalFilter;
030    import com.liferay.portlet.PortletConfigFactoryUtil;
031    import com.liferay.util.servlet.ServletResponseUtil;
032    
033    import java.util.List;
034    import java.util.Locale;
035    import java.util.regex.Matcher;
036    import java.util.regex.Pattern;
037    
038    import javax.portlet.PortletConfig;
039    
040    import javax.servlet.FilterChain;
041    import javax.servlet.FilterConfig;
042    import javax.servlet.ServletContext;
043    import javax.servlet.http.HttpServletRequest;
044    import javax.servlet.http.HttpServletResponse;
045    
046    /**
047     * @author Eduardo Lundgren
048     * @author Shuyang Zhou
049     */
050    public class LanguageFilter extends BasePortalFilter {
051    
052            public void init(FilterConfig filterConfig) {
053                    super.init(filterConfig);
054    
055                    ServletContext servletContext = filterConfig.getServletContext();
056    
057                    PortletApp portletApp = (PortletApp)servletContext.getAttribute(
058                            PortletServlet.PORTLET_APP);
059    
060                    if ((portletApp == null) || !portletApp.isWARFile()) {
061                            return;
062                    }
063    
064                    List<Portlet> portlets = portletApp.getPortlets();
065    
066                    if (portlets.size() <= 0) {
067                            return;
068                    }
069    
070                    _portletConfig = PortletConfigFactoryUtil.create(
071                            portlets.get(0), filterConfig.getServletContext());
072            }
073    
074            protected void processFilter(
075                            HttpServletRequest request, HttpServletResponse response,
076                            FilterChain filterChain)
077                    throws Exception {
078    
079                    StringServletResponse stringResponse = new StringServletResponse(
080                            response);
081    
082                    processFilter(
083                            LanguageFilter.class, request, stringResponse, filterChain);
084    
085                    if (_log.isDebugEnabled()) {
086                            String completeURL = HttpUtil.getCompleteURL(request);
087    
088                            _log.debug("Translating response " + completeURL);
089                    }
090    
091                    String content = translateResponse(request, stringResponse);
092    
093                    ServletResponseUtil.write(response, content);
094            }
095    
096            protected String translateResponse(
097                    HttpServletRequest request, StringServletResponse stringResponse) {
098    
099                    String languageId = LanguageUtil.getLanguageId(request);
100                    Locale locale = LocaleUtil.fromLanguageId(languageId);
101    
102                    String content = stringResponse.getString();
103    
104                    StringBundler sb = new StringBundler();
105    
106                    Matcher matcher = _pattern.matcher(content);
107    
108                    int x = 0;
109    
110                    while (matcher.find()) {
111                            int y = matcher.start(0);
112    
113                            String key = matcher.group(1);
114    
115                            sb.append(content.substring(x, y));
116                            sb.append(StringPool.APOSTROPHE);
117    
118                            String value = null;
119    
120                            if (_portletConfig != null) {
121                                    value = UnicodeLanguageUtil.get(_portletConfig, locale, key);
122                            }
123                            else {
124                                    value = UnicodeLanguageUtil.get(locale, key);
125                            }
126    
127                            sb.append(value);
128                            sb.append(StringPool.APOSTROPHE);
129    
130                            x = matcher.end(0);
131                    }
132    
133                    sb.append(content.substring(x));
134    
135                    return sb.toString();
136            }
137    
138            private static Log _log = LogFactoryUtil.getLog(LanguageFilter.class);
139    
140            private static Pattern _pattern = Pattern.compile(
141                    "Liferay\\.Language\\.get\\([\"']([^)]+)[\"']\\)");
142    
143            private PortletConfig _portletConfig;
144    
145    }