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.shiro.authz.aop;
020
021import java.lang.annotation.Annotation;
022
023import org.apache.shiro.authz.UnauthenticatedException;
024import 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 */
033public 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}