    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 org.apache.wiki.api.core.Engine;
    022import org.apache.wiki.api.core.Session;
    023import org.apache.wiki.api.spi.Wiki;
    024import org.apache.wiki.i18n.InternationalizationManager;
    025import org.apache.wiki.preferences.Preferences;
    026import org.apache.wiki.util.TextUtil;
    027
    028import jakarta.servlet.http.HttpServletRequest;
    029import java.io.IOException;
    030import java.security.Principal;
    031import java.util.regex.Pattern;
    032
    033
    034/**
    035 *  Returns the current user name, or empty, if the user has not been validated.
    036 *
    037 *  @since 2.0
    038 */
    039public class UserNameTag extends WikiTagBase {
    040
    041    private static final long serialVersionUID = 0L;
    042
    043    private static final String notStartWithBlankOrColon = "^[^( |:)]";
    044
    045    private static final String noColons = "[^:]*";
    046
    047    private static final Pattern VALID_USER_NAME_PATTERN = Pattern.compile(notStartWithBlankOrColon + noColons);
    048
    049    @Override
    050    public final int doWikiStartTag() throws IOException {
    051        final Engine engine = m_wikiContext.getEngine();
    052        final Session wikiSession = Wiki.session().find( engine, ( HttpServletRequest )pageContext.getRequest() );
    053        final Principal user = wikiSession.getUserPrincipal();
    054
    055        if( user != null ) {
    056            if( VALID_USER_NAME_PATTERN.matcher( user.getName() ).matches() ) {
    057                pageContext.getOut().print( TextUtil.replaceEntities( user.getName() ) );
    058            } else {
    059                pageContext.getOut().print( Preferences.getBundle( m_wikiContext, InternationalizationManager.CORE_BUNDLE )
    060                                                       .getString( "security.user.fullname.invalid" ) );
    061            }
    062        }
    063
    064        return SKIP_BODY;
    065    }
    066
    067}