1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.shiro.web.tags;
20
21 import javax.servlet.jsp.JspException;
22 import javax.servlet.jsp.tagext.TagSupport;
23
24 import org.slf4j.Logger;
25 import org.slf4j.LoggerFactory;
26
27
28 /**
29 * JSP tag that renders the tag body only if the current user has <em>not</em> executed a successful authentication
30 * attempt <em>during their current session</em>.
31 *
32 * <p>The logically opposite tag of this one is the {@link org.apache.shiro.web.tags.AuthenticatedTag}.
33 *
34 * @since 0.2
35 */
36 public class NotAuthenticatedTag extends SecureTag {
37
38 //TODO - complete JavaDoc
39
40 private static final Logger log = LoggerFactory.getLogger(NotAuthenticatedTag.class);
41
42 public int onDoStartTag() throws JspException {
43 if (getSubject() == null || !getSubject().isAuthenticated()) {
44 if (log.isTraceEnabled()) {
45 log.trace("Subject does not exist or is not authenticated. Tag body will be evaluated.");
46 }
47 return TagSupport.EVAL_BODY_INCLUDE;
48 } else {
49 if (log.isTraceEnabled()) {
50 log.trace("Subject exists and is authenticated. Tag body will not be evaluated.");
51 }
52 return TagSupport.SKIP_BODY;
53 }
54 }
55 }