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 */
019package org.apache.wiki.tags;
020
021import java.io.IOException;
022import java.security.Principal;
023import java.util.regex.Pattern;
024
025import javax.servlet.http.HttpServletRequest;
026
027import org.apache.wiki.WikiEngine;
028import org.apache.wiki.WikiSession;
029import org.apache.wiki.i18n.InternationalizationManager;
030import org.apache.wiki.preferences.Preferences;
031import 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 */
039public 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}