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;
016    
017    import com.liferay.portal.kernel.exception.PortalException;
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.servlet.HttpHeaders;
022    import com.liferay.portal.kernel.servlet.ServletResponseUtil;
023    import com.liferay.portal.kernel.util.ArrayUtil;
024    import com.liferay.portal.kernel.util.CharPool;
025    import com.liferay.portal.kernel.util.ContentTypes;
026    import com.liferay.portal.kernel.util.LocaleUtil;
027    import com.liferay.portal.kernel.util.StringPool;
028    import com.liferay.portal.kernel.util.StringUtil;
029    import com.liferay.portal.kernel.util.Validator;
030    import com.liferay.portal.security.auth.AuthTokenUtil;
031    
032    import java.io.IOException;
033    
034    import java.util.Locale;
035    
036    import javax.servlet.http.HttpServlet;
037    import javax.servlet.http.HttpServletRequest;
038    import javax.servlet.http.HttpServletResponse;
039    
040    /**
041     * @author Brian Wing Shun Chan
042     */
043    public class LanguageServlet extends HttpServlet {
044    
045            @Override
046            public void service(
047                            HttpServletRequest request, HttpServletResponse response)
048                    throws IOException {
049    
050                    String path = request.getPathInfo();
051    
052                    if (_log.isDebugEnabled()) {
053                            _log.debug("Path " + path);
054                    }
055    
056                    try {
057                            AuthTokenUtil.checkCSRFToken(
058                                    request, LanguageServlet.class.getName());
059                    }
060                    catch (PortalException pe) {
061                            _log.error("Invalid authentication token received");
062    
063                            return;
064                    }
065    
066                    if (Validator.isNotNull(path) && path.startsWith(StringPool.SLASH)) {
067                            path = path.substring(1);
068                    }
069    
070                    String[] pathArray = StringUtil.split(path, CharPool.SLASH);
071    
072                    if (pathArray.length == 0) {
073                            _log.error("Language id is not specified");
074    
075                            return;
076                    }
077    
078                    if (pathArray.length == 1) {
079                            _log.error("Language key is not specified");
080    
081                            return;
082                    }
083    
084                    Locale locale = LocaleUtil.fromLanguageId(pathArray[0]);
085                    String key = pathArray[1];
086    
087                    Object[] arguments = null;
088    
089                    if (pathArray.length > 2) {
090                            arguments = new Object[pathArray.length - 2];
091    
092                            System.arraycopy(pathArray, 2, arguments, 0, arguments.length);
093                    }
094    
095                    String value = key;
096    
097                    try {
098                            if (ArrayUtil.isEmpty(arguments)) {
099                                    value = LanguageUtil.get(locale, key);
100                            }
101                            else {
102                                    value = LanguageUtil.format(locale, key, arguments);
103                            }
104                    }
105                    catch (Exception e) {
106                            if (_log.isWarnEnabled()) {
107                                    _log.warn(e, e);
108                            }
109                    }
110    
111                    if (!LanguageUtil.isValidLanguageKey(locale, key)) {
112                            response.setDateHeader(HttpHeaders.EXPIRES, 0);
113                            response.setHeader(
114                                    HttpHeaders.CACHE_CONTROL,
115                                    HttpHeaders.CACHE_CONTROL_NO_CACHE_VALUE);
116                            response.setHeader(
117                                    HttpHeaders.PRAGMA, HttpHeaders.PRAGMA_NO_CACHE_VALUE);
118                    }
119    
120                    response.setContentType(ContentTypes.TEXT_PLAIN_UTF8);
121                    response.setHeader(
122                            HttpHeaders.CONTENT_DISPOSITION, _CONTENT_DISPOSITION);
123    
124                    ServletResponseUtil.write(response, value.getBytes(StringPool.UTF8));
125            }
126    
127            private static final String _CONTENT_DISPOSITION =
128                    "attachment; filename=language.txt";
129    
130            private static Log _log = LogFactoryUtil.getLog(LanguageServlet.class);
131    
132    }