001    /**
002     * Copyright (c) 2000-2012 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;
016    
017    import com.liferay.portal.NoSuchLayoutException;
018    import com.liferay.portal.kernel.language.LanguageUtil;
019    import com.liferay.portal.kernel.log.Log;
020    import com.liferay.portal.kernel.log.LogFactoryUtil;
021    import com.liferay.portal.kernel.util.CharPool;
022    import com.liferay.portal.kernel.util.GetterUtil;
023    import com.liferay.portal.kernel.util.LocaleUtil;
024    import com.liferay.portal.kernel.util.StringPool;
025    import com.liferay.portal.kernel.util.Validator;
026    import com.liferay.portal.kernel.xml.Element;
027    import com.liferay.portal.util.PortalUtil;
028    import com.liferay.portal.util.WebKeys;
029    
030    import java.io.IOException;
031    
032    import java.util.Collections;
033    import java.util.HashSet;
034    import java.util.List;
035    import java.util.Locale;
036    import java.util.Set;
037    
038    import javax.servlet.RequestDispatcher;
039    import javax.servlet.ServletContext;
040    import javax.servlet.ServletException;
041    import javax.servlet.http.HttpServlet;
042    import javax.servlet.http.HttpServletRequest;
043    import javax.servlet.http.HttpServletResponse;
044    
045    /**
046     * @author Brian Wing Shun Chan
047     */
048    public class I18nServlet extends HttpServlet {
049    
050            public static Set<String> getLanguageIds() {
051                    return _languageIds;
052            }
053    
054            public static void setLanguageIds(Element root) {
055                    _languageIds.clear();
056    
057                    List<Element> rootElements = root.elements("servlet-mapping");
058    
059                    for (Element element : rootElements) {
060                            String servletName = element.elementText("servlet-name");
061    
062                            if (servletName.equals("I18n Servlet")) {
063                                    String urlPattern = element.elementText("url-pattern");
064    
065                                    String languageId = urlPattern.substring(
066                                            0, urlPattern.lastIndexOf(CharPool.SLASH));
067    
068                                    _languageIds.add(languageId);
069                            }
070                    }
071    
072                    _languageIds = Collections.unmodifiableSet(_languageIds);
073            }
074    
075            @Override
076            public void service(
077                            HttpServletRequest request, HttpServletResponse response)
078                    throws IOException, ServletException {
079    
080                    try {
081                            String[] i18nData = getI18nData(request);
082    
083                            if ((i18nData == null) ||
084                                    !PortalUtil.isValidResourceId(i18nData[2])) {
085    
086                                    PortalUtil.sendError(
087                                            HttpServletResponse.SC_NOT_FOUND,
088                                            new NoSuchLayoutException(), request, response);
089                            }
090                            else {
091                                    String i18nLanguageId = i18nData[0];
092                                    String i18nPath = i18nData[1];
093                                    String redirect = i18nData[2];
094    
095                                    request.setAttribute(WebKeys.I18N_LANGUAGE_ID, i18nLanguageId);
096                                    request.setAttribute(WebKeys.I18N_PATH, i18nPath);
097    
098                                    ServletContext servletContext = getServletContext();
099    
100                                    RequestDispatcher requestDispatcher =
101                                            servletContext.getRequestDispatcher(redirect);
102    
103                                    requestDispatcher.forward(request, response);
104                            }
105                    }
106                    catch (Exception e) {
107                            _log.error(e, e);
108    
109                            PortalUtil.sendError(
110                                    HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e, request,
111                                    response);
112                    }
113            }
114    
115            protected String[] getI18nData(HttpServletRequest request) {
116                    String path = GetterUtil.getString(request.getPathInfo());
117    
118                    if (Validator.isNull(path)) {
119                            return null;
120                    }
121    
122                    String i18nLanguageId = request.getServletPath();
123    
124                    int pos = i18nLanguageId.lastIndexOf(CharPool.SLASH);
125    
126                    i18nLanguageId = i18nLanguageId.substring(pos + 1);
127    
128                    if (_log.isDebugEnabled()) {
129                            _log.debug("Language ID " + i18nLanguageId);
130                    }
131    
132                    if (Validator.isNull(i18nLanguageId)) {
133                            return null;
134                    }
135    
136                    String i18nPath = StringPool.SLASH + i18nLanguageId;
137    
138                    Locale locale = LocaleUtil.fromLanguageId(i18nLanguageId);
139    
140                    if (Validator.isNull(locale.getCountry())) {
141    
142                            // Locales must contain the country code
143    
144                            locale = LanguageUtil.getLocale(locale.getLanguage());
145    
146                            i18nLanguageId = LocaleUtil.toLanguageId(locale);
147                    }
148    
149                    String redirect = path;
150    
151                    if (_log.isDebugEnabled()) {
152                            _log.debug("Redirect " + redirect);
153                    }
154    
155                    return new String[] {i18nLanguageId, i18nPath, redirect};
156            }
157    
158            private static Log _log = LogFactoryUtil.getLog(I18nServlet.class);
159    
160            private static Set<String> _languageIds = new HashSet<String>();
161    
162    }