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.authz.aop;
020    
021    import java.lang.annotation.Annotation;
022    
023    import org.apache.shiro.authz.UnauthenticatedException;
024    import org.apache.shiro.authz.annotation.RequiresAuthentication;
025    
026    
027    /**
028     * Handles {@link RequiresAuthentication RequiresAuthentication} annotations and ensures the calling subject is
029     * authenticated before allowing access.
030     *
031     * @since 0.9.0
032     */
033    public class AuthenticatedAnnotationHandler extends AuthorizingAnnotationHandler {
034    
035        /**
036         * Default no-argument constructor that ensures this handler to process
037         * {@link org.apache.shiro.authz.annotation.RequiresAuthentication RequiresAuthentication} annotations.
038         */
039        public AuthenticatedAnnotationHandler() {
040            super(RequiresAuthentication.class);
041        }
042    
043        /**
044         * Ensures that the calling <code>Subject</code> is authenticated, and if not, throws an
045         * {@link org.apache.shiro.authz.UnauthenticatedException UnauthenticatedException} indicating the method is not allowed to be executed.
046         *
047         * @param a the annotation to inspect
048         * @throws org.apache.shiro.authz.UnauthenticatedException if the calling <code>Subject</code> has not yet
049         * authenticated.
050         */
051        public void assertAuthorized(Annotation a) throws UnauthenticatedException {
052            if (a instanceof RequiresAuthentication && !getSubject().isAuthenticated() ) {
053                throw new UnauthenticatedException( "The current Subject is not authenticated.  Access denied." );
054            }
055        }
056    }