001    /* 
002        Licensed to the Apache Software Foundation (ASF) under one
003        or more contributor license agreements.  See the NOTICE file
004        distributed with this work for additional information
005        regarding copyright ownership.  The ASF licenses this file
006        to you under the Apache License, Version 2.0 (the
007        "License"); you may not use this file except in compliance
008        with the License.  You may obtain a copy of the License at
009    
010           http://www.apache.org/licenses/LICENSE-2.0
011    
012        Unless required by applicable law or agreed to in writing,
013        software distributed under the License is distributed on an
014        "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015        KIND, either express or implied.  See the License for the
016        specific language governing permissions and limitations
017        under the License.  
018     */
019    package org.apache.wiki.tags;
020    
021    import java.io.IOException;
022    import java.security.Principal;
023    import java.util.regex.Pattern;
024    
025    import javax.servlet.http.HttpServletRequest;
026    
027    import org.apache.wiki.WikiEngine;
028    import org.apache.wiki.WikiSession;
029    import org.apache.wiki.i18n.InternationalizationManager;
030    import org.apache.wiki.preferences.Preferences;
031    import org.apache.wiki.util.TextUtil;
032    
033    /**
034     *  Returns the current user name, or empty, if the user has not been
035     *  validated.
036     *
037     *  @since 2.0
038     */
039    public class UserNameTag extends WikiTagBase
040    {
041        private static final long serialVersionUID = 0L;
042    
043        private static String notStartWithBlankOrColon = "^[^( |:)]";
044    
045        private static String noColons = "[^:]*";
046    
047        private static final Pattern VALID_USER_NAME_PATTERN = Pattern.compile(notStartWithBlankOrColon + noColons);
048    
049        public final int doWikiStartTag() throws IOException
050        {
051            WikiEngine engine = this.m_wikiContext.getEngine();
052            WikiSession wikiSession = WikiSession.getWikiSession(engine, (HttpServletRequest) pageContext.getRequest());
053            Principal user = wikiSession.getUserPrincipal();
054    
055            if (user != null)
056            {
057                if (VALID_USER_NAME_PATTERN.matcher(user.getName()).matches())
058                {
059                    pageContext.getOut().print(TextUtil.replaceEntities(user.getName()));
060                }
061                else
062                {
063                    pageContext.getOut().print( Preferences.getBundle( m_wikiContext, InternationalizationManager.CORE_BUNDLE )
064                                                           .getString( "security.user.fullname.invalid" ) );
065                }
066            }
067    
068            return SKIP_BODY;
069        }
070    }