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.shiro.web.tags;
020    
021    import javax.servlet.jsp.JspException;
022    import javax.servlet.jsp.tagext.TagSupport;
023    
024    import org.slf4j.Logger;
025    import org.slf4j.LoggerFactory;
026    
027    
028    /**
029     * JSP tag that renders the tag body only if the current user has <em>not</em> executed a successful authentication
030     * attempt <em>during their current session</em>.
031     *
032     * <p>The logically opposite tag of this one is the {@link org.apache.shiro.web.tags.AuthenticatedTag}.
033     *
034     * @since 0.2
035     */
036    public class NotAuthenticatedTag extends SecureTag {
037    
038        //TODO - complete JavaDoc
039    
040        private static final Logger log = LoggerFactory.getLogger(NotAuthenticatedTag.class);
041    
042        public int onDoStartTag() throws JspException {
043            if (getSubject() == null || !getSubject().isAuthenticated()) {
044                if (log.isTraceEnabled()) {
045                    log.trace("Subject does not exist or is not authenticated.  Tag body will be evaluated.");
046                }
047                return TagSupport.EVAL_BODY_INCLUDE;
048            } else {
049                if (log.isTraceEnabled()) {
050                    log.trace("Subject exists and is authenticated.  Tag body will not be evaluated.");
051                }
052                return TagSupport.SKIP_BODY;
053            }
054        }
055    }