| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.jsecurity.authz.aop; |
| |
| import org.jsecurity.authz.AuthorizationException; |
| import org.jsecurity.authz.UnauthenticatedException; |
| import org.jsecurity.authz.annotation.RequiresGuest; |
| |
| import java.lang.annotation.Annotation; |
| |
| /** |
| * Checks to see if a @{@link org.jsecurity.authz.annotation.RequiresGuest RequiresGuest} annotation |
| * is declared, and if so, ensures the calling <code>Subject</code> does <em>not</em> |
| * have an {@link org.jsecurity.subject.Subject#getPrincipal() identity} before invoking the method. |
| * <p> |
| * This annotation essentially ensures that <code>subject.{@link org.jsecurity.subject.Subject#getPrincipal() getPrincipal()} == null</code>. |
| * |
| * @author Les Hazlewood |
| * @since 0.9.0 RC3 |
| */ |
| public class GuestAnnotationHandler extends AuthorizingAnnotationHandler { |
| |
| /** |
| * Default no-argument constructor that ensures this interceptor looks for |
| * |
| * {@link org.jsecurity.authz.annotation.RequiresGuest RequiresGuest} annotations in a method |
| * declaration. |
| */ |
| public GuestAnnotationHandler() { |
| super(RequiresGuest.class); |
| } |
| |
| /** |
| * Ensures that the calling <code>Subject</code> is NOT a <em>user</em>, that is, they do not |
| * have an {@link org.jsecurity.subject.Subject#getPrincipal() identity} before continuing. If they are |
| * a user ({@link org.jsecurity.subject.Subject#getPrincipal() Subject.getPrincipal()} != null), an |
| * <code>AuthorizingException</code> will be thrown indicating that execution is not allowed to continue. |
| * |
| * @param a the annotation to check for one or more roles |
| * @throws org.jsecurity.authz.AuthorizationException |
| * if the calling <code>Subject</code> is not a "guest". |
| */ |
| public void assertAuthorized(Annotation a) throws AuthorizationException { |
| if (a instanceof RequiresGuest && getSubject().getPrincipal() != null) { |
| throw new UnauthenticatedException("Attempting to perform a guest-only operation. The current Subject is " + |
| "not a guest (they have been authenticated or remembered from a previous login). Access " + |
| "denied."); |
| } |
| } |
| } |