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<FONT color="green">001</FONT> /*<a name="line.1"></a>
<FONT color="green">002</FONT> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a>
<FONT color="green">003</FONT> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a>
<FONT color="green">004</FONT> * distributed with this work for additional information<a name="line.4"></a>
<FONT color="green">005</FONT> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a>
<FONT color="green">006</FONT> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a>
<FONT color="green">007</FONT> * "License"); you may not use this file except in compliance<a name="line.7"></a>
<FONT color="green">008</FONT> * with the License. You may obtain a copy of the License at<a name="line.8"></a>
<FONT color="green">009</FONT> *<a name="line.9"></a>
<FONT color="green">010</FONT> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<FONT color="green">011</FONT> *<a name="line.11"></a>
<FONT color="green">012</FONT> * Unless required by applicable law or agreed to in writing,<a name="line.12"></a>
<FONT color="green">013</FONT> * software distributed under the License is distributed on an<a name="line.13"></a>
<FONT color="green">014</FONT> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY<a name="line.14"></a>
<FONT color="green">015</FONT> * KIND, either express or implied. See the License for the<a name="line.15"></a>
<FONT color="green">016</FONT> * specific language governing permissions and limitations<a name="line.16"></a>
<FONT color="green">017</FONT> * under the License.<a name="line.17"></a>
<FONT color="green">018</FONT> */<a name="line.18"></a>
<FONT color="green">019</FONT> package org.apache.shiro.authz.aop;<a name="line.19"></a>
<FONT color="green">020</FONT> <a name="line.20"></a>
<FONT color="green">021</FONT> import java.lang.annotation.Annotation;<a name="line.21"></a>
<FONT color="green">022</FONT> <a name="line.22"></a>
<FONT color="green">023</FONT> import org.apache.shiro.authz.AuthorizationException;<a name="line.23"></a>
<FONT color="green">024</FONT> import org.apache.shiro.authz.UnauthenticatedException;<a name="line.24"></a>
<FONT color="green">025</FONT> import org.apache.shiro.authz.annotation.RequiresGuest;<a name="line.25"></a>
<FONT color="green">026</FONT> <a name="line.26"></a>
<FONT color="green">027</FONT> <a name="line.27"></a>
<FONT color="green">028</FONT> /**<a name="line.28"></a>
<FONT color="green">029</FONT> * Checks to see if a @{@link org.apache.shiro.authz.annotation.RequiresGuest RequiresGuest} annotation<a name="line.29"></a>
<FONT color="green">030</FONT> * is declared, and if so, ensures the calling &lt;code&gt;Subject&lt;/code&gt; does &lt;em&gt;not&lt;/em&gt;<a name="line.30"></a>
<FONT color="green">031</FONT> * have an {@link org.apache.shiro.subject.Subject#getPrincipal() identity} before invoking the method.<a name="line.31"></a>
<FONT color="green">032</FONT> * &lt;p&gt;<a name="line.32"></a>
<FONT color="green">033</FONT> * This annotation essentially ensures that &lt;code&gt;subject.{@link org.apache.shiro.subject.Subject#getPrincipal() getPrincipal()} == null&lt;/code&gt;.<a name="line.33"></a>
<FONT color="green">034</FONT> *<a name="line.34"></a>
<FONT color="green">035</FONT> * @since 0.9.0<a name="line.35"></a>
<FONT color="green">036</FONT> */<a name="line.36"></a>
<FONT color="green">037</FONT> public class GuestAnnotationHandler extends AuthorizingAnnotationHandler {<a name="line.37"></a>
<FONT color="green">038</FONT> <a name="line.38"></a>
<FONT color="green">039</FONT> /**<a name="line.39"></a>
<FONT color="green">040</FONT> * Default no-argument constructor that ensures this interceptor looks for<a name="line.40"></a>
<FONT color="green">041</FONT> *<a name="line.41"></a>
<FONT color="green">042</FONT> * {@link org.apache.shiro.authz.annotation.RequiresGuest RequiresGuest} annotations in a method<a name="line.42"></a>
<FONT color="green">043</FONT> * declaration.<a name="line.43"></a>
<FONT color="green">044</FONT> */<a name="line.44"></a>
<FONT color="green">045</FONT> public GuestAnnotationHandler() {<a name="line.45"></a>
<FONT color="green">046</FONT> super(RequiresGuest.class);<a name="line.46"></a>
<FONT color="green">047</FONT> }<a name="line.47"></a>
<FONT color="green">048</FONT> <a name="line.48"></a>
<FONT color="green">049</FONT> /**<a name="line.49"></a>
<FONT color="green">050</FONT> * Ensures that the calling &lt;code&gt;Subject&lt;/code&gt; is NOT a &lt;em&gt;user&lt;/em&gt;, that is, they do not<a name="line.50"></a>
<FONT color="green">051</FONT> * have an {@link org.apache.shiro.subject.Subject#getPrincipal() identity} before continuing. If they are<a name="line.51"></a>
<FONT color="green">052</FONT> * a user ({@link org.apache.shiro.subject.Subject#getPrincipal() Subject.getPrincipal()} != null), an<a name="line.52"></a>
<FONT color="green">053</FONT> * &lt;code&gt;AuthorizingException&lt;/code&gt; will be thrown indicating that execution is not allowed to continue.<a name="line.53"></a>
<FONT color="green">054</FONT> *<a name="line.54"></a>
<FONT color="green">055</FONT> * @param a the annotation to check for one or more roles<a name="line.55"></a>
<FONT color="green">056</FONT> * @throws org.apache.shiro.authz.AuthorizationException<a name="line.56"></a>
<FONT color="green">057</FONT> * if the calling &lt;code&gt;Subject&lt;/code&gt; is not a &amp;quot;guest&amp;quot;.<a name="line.57"></a>
<FONT color="green">058</FONT> */<a name="line.58"></a>
<FONT color="green">059</FONT> public void assertAuthorized(Annotation a) throws AuthorizationException {<a name="line.59"></a>
<FONT color="green">060</FONT> if (a instanceof RequiresGuest &amp;&amp; getSubject().getPrincipal() != null) {<a name="line.60"></a>
<FONT color="green">061</FONT> throw new UnauthenticatedException("Attempting to perform a guest-only operation. The current Subject is " +<a name="line.61"></a>
<FONT color="green">062</FONT> "not a guest (they have been authenticated or remembered from a previous login). Access " +<a name="line.62"></a>
<FONT color="green">063</FONT> "denied.");<a name="line.63"></a>
<FONT color="green">064</FONT> }<a name="line.64"></a>
<FONT color="green">065</FONT> }<a name="line.65"></a>
<FONT color="green">066</FONT> }<a name="line.66"></a>
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