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.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.BufferCacheServletResponse;
022    import com.liferay.portal.kernel.servlet.PortletServlet;
023    import com.liferay.portal.kernel.servlet.ServletResponseUtil;
024    import com.liferay.portal.kernel.util.HttpUtil;
025    import com.liferay.portal.kernel.util.LocaleUtil;
026    import com.liferay.portal.kernel.util.StringBundler;
027    import com.liferay.portal.kernel.util.StringPool;
028    import com.liferay.portal.model.Portlet;
029    import com.liferay.portal.model.PortletApp;
030    import com.liferay.portal.servlet.filters.BasePortalFilter;
031    import com.liferay.portlet.PortletConfigFactoryUtil;
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            @Override
053            public void init(FilterConfig filterConfig) {
054                    super.init(filterConfig);
055    
056                    ServletContext servletContext = filterConfig.getServletContext();
057    
058                    PortletApp portletApp = (PortletApp)servletContext.getAttribute(
059                            PortletServlet.PORTLET_APP);
060    
061                    if ((portletApp == null) || !portletApp.isWARFile()) {
062                            return;
063                    }
064    
065                    List<Portlet> portlets = portletApp.getPortlets();
066    
067                    if (portlets.size() <= 0) {
068                            return;
069                    }
070    
071                    _portletConfig = PortletConfigFactoryUtil.create(
072                            portlets.get(0), filterConfig.getServletContext());
073            }
074    
075            @Override
076            protected void processFilter(
077                            HttpServletRequest request, HttpServletResponse response,
078                            FilterChain filterChain)
079                    throws Exception {
080    
081                    BufferCacheServletResponse bufferCacheServletResponse =
082                            new BufferCacheServletResponse(response);
083    
084                    processFilter(
085                            LanguageFilter.class, request, bufferCacheServletResponse,
086                            filterChain);
087    
088                    if (_log.isDebugEnabled()) {
089                            String completeURL = HttpUtil.getCompleteURL(request);
090    
091                            _log.debug("Translating response " + completeURL);
092                    }
093    
094                    String content = bufferCacheServletResponse.getString();
095    
096                    content = translateResponse(request, content);
097    
098                    ServletResponseUtil.write(response, content);
099            }
100    
101            protected String translateResponse(
102                    HttpServletRequest request, String content) {
103    
104                    String languageId = LanguageUtil.getLanguageId(request);
105                    Locale locale = LocaleUtil.fromLanguageId(languageId);
106    
107                    StringBundler sb = new StringBundler();
108    
109                    Matcher matcher = _pattern.matcher(content);
110    
111                    int x = 0;
112    
113                    while (matcher.find()) {
114                            int y = matcher.start(0);
115    
116                            String key = matcher.group(1);
117    
118                            sb.append(content.substring(x, y));
119                            sb.append(StringPool.APOSTROPHE);
120    
121                            String value = null;
122    
123                            if (_portletConfig != null) {
124                                    value = UnicodeLanguageUtil.get(_portletConfig, locale, key);
125                            }
126                            else {
127                                    value = UnicodeLanguageUtil.get(locale, key);
128                            }
129    
130                            sb.append(value);
131                            sb.append(StringPool.APOSTROPHE);
132    
133                            x = matcher.end(0);
134                    }
135    
136                    sb.append(content.substring(x));
137    
138                    return sb.toString();
139            }
140    
141            private static Log _log = LogFactoryUtil.getLog(LanguageFilter.class);
142    
143            private static Pattern _pattern = Pattern.compile(
144                    "Liferay\\.Language\\.get\\([\"']([^)]+)[\"']\\)");
145    
146            private PortletConfig _portletConfig;
147    
148    }