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/* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
 *
 * Licensed 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.acegisecurity.context.rmi;

import org.acegisecurity.context.SecurityContext;
import org.acegisecurity.context.SecurityContextHolder;

import org.aopalliance.intercept.MethodInvocation;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.remoting.support.RemoteInvocation;

import java.lang.reflect.InvocationTargetException;


/**
 * The actual RemoteInvocation that is passed from the client to the server, which contains the
 * contents of {@link SecurityContextHolder}, being a {@link SecurityContext} object.

When constructed on the * client via {@link org.acegisecurity.context.rmi.ContextPropagatingRemoteInvocationFactory}, the contents of the * SecurityContext are stored inside the object. The object is then passed to the server that is * processing the remote invocation. Upon the server invoking the remote invocation, it will retrieve the passed * contents of the SecurityContextHolder and set them to the server-side * SecurityContextHolder whilst the target object is invoked. When the target invocation has been * completed, the server-side SecurityContextHolder will be reset to a new instance of * SecurityContextImpl.

* * @author James Monaghan * @author Ben Alex * @version $Id: ContextPropagatingRemoteInvocation.java 1496 2006-05-23 13:38:33Z benalex $ */ public class ContextPropagatingRemoteInvocation extends RemoteInvocation { //~ Static fields/initializers ===================================================================================== private static final Log logger = LogFactory.getLog(ContextPropagatingRemoteInvocation.class); //~ Instance fields ================================================================================================ private SecurityContext securityContext; //~ Constructors =================================================================================================== /** * Constructs the object, storing the value of the client-side * SecurityContextHolder inside the object. * * @param methodInvocation the method to invoke */ public ContextPropagatingRemoteInvocation(MethodInvocation methodInvocation) { super(methodInvocation); securityContext = SecurityContextHolder.getContext(); if (logger.isDebugEnabled()) { logger.debug("RemoteInvocation now has SecurityContext: " + securityContext); } } //~ Methods ======================================================================================================== /** * Invoked on the server-side as described in the class JavaDocs.

Invocations will always have their * {@link org.acegisecurity.Authentication#setAuthenticated(boolean)} set to false, which is * guaranteed to always be accepted by Authentication implementations. This ensures that even * remotely authenticated Authentications will be untrusted by the server-side, which is an * appropriate security measure.

* * @param targetObject the target object to apply the invocation to * * @return the invocation result * * @throws NoSuchMethodException if the method name could not be resolved * @throws IllegalAccessException if the method could not be accessed * @throws InvocationTargetException if the method invocation resulted in an exception */ public Object invoke(Object targetObject) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException { SecurityContextHolder.setContext(securityContext); if ((SecurityContextHolder.getContext() != null) && (SecurityContextHolder.getContext().getAuthentication() != null)) { SecurityContextHolder.getContext().getAuthentication().setAuthenticated(false); } if (logger.isDebugEnabled()) { logger.debug("Set SecurityContextHolder to contain: " + securityContext); } try { return super.invoke(targetObject); } finally { SecurityContextHolder.clearContext(); if (logger.isDebugEnabled()) { logger.debug("Set SecurityContext to new instance of SecurityContextImpl"); } } } }




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