/*
* 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.springframework.security.access.intercept.aopalliance;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.Serializable;
import java.lang.reflect.Method;
import java.util.*;
import org.aopalliance.aop.Advice;
import org.springframework.aop.Pointcut;
import org.springframework.aop.support.AbstractPointcutAdvisor;
import org.springframework.aop.support.StaticMethodMatcherPointcut;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.security.access.method.MethodSecurityMetadataSource;
import org.springframework.util.Assert;
/**
* Advisor driven by a {@link MethodSecurityMetadataSource}, used to exclude a
* {@link MethodSecurityInterceptor} from public (non-secure) methods.
* <p>
* Because the AOP framework caches advice calculations, this is normally faster than just
* letting the <code>MethodSecurityInterceptor</code> run and find out itself that it has
* no work to do.
* <p>
* This class also allows the use of Spring's {@code DefaultAdvisorAutoProxyCreator},
* which makes configuration easier than setup a <code>ProxyFactoryBean</code> for each
* object requiring security. Note that autoproxying is not supported for BeanFactory
* implementations, as post-processing is automatic only for application contexts.
* <p>
* Based on Spring's TransactionAttributeSourceAdvisor.
*
* @author Ben Alex
* @author Luke Taylor
*/
public class MethodSecurityMetadataSourceAdvisor extends AbstractPointcutAdvisor
implements BeanFactoryAware {
// ~ Instance fields
// ================================================================================================
private transient MethodSecurityMetadataSource attributeSource;
private transient MethodSecurityInterceptor interceptor;
private final Pointcut pointcut = new MethodSecurityMetadataSourcePointcut();
private BeanFactory beanFactory;
private final String adviceBeanName;
private final String metadataSourceBeanName;
private transient volatile Object adviceMonitor = new Object();
// ~ Constructors
// ===================================================================================================
/**
* Alternative constructor for situations where we want the advisor decoupled from the
* advice. Instead the advice bean name should be set. This prevents eager
* instantiation of the interceptor (and hence the AuthenticationManager). See
* SEC-773, for example. The metadataSourceBeanName is used rather than a direct
* reference to support serialization via a bean factory lookup.
*
* @param adviceBeanName name of the MethodSecurityInterceptor bean
* @param attributeSource the SecurityMetadataSource (should be the same as the one
* used on the interceptor)
* @param attributeSourceBeanName the bean name of the attributeSource (required for
* serialization)
*/
public MethodSecurityMetadataSourceAdvisor(String adviceBeanName,
MethodSecurityMetadataSource attributeSource, String attributeSourceBeanName) {
Assert.notNull(adviceBeanName, "The adviceBeanName cannot be null");
Assert.notNull(attributeSource, "The attributeSource cannot be null");
Assert.notNull(attributeSourceBeanName,
"The attributeSourceBeanName cannot be null");
this.adviceBeanName = adviceBeanName;
this.attributeSource = attributeSource;
this.metadataSourceBeanName = attributeSourceBeanName;
}
// ~ Methods
// ========================================================================================================
public Pointcut getPointcut() {
return pointcut;
}
public Advice getAdvice() {
synchronized (this.adviceMonitor) {
if (interceptor == null) {
Assert.notNull(adviceBeanName,
"'adviceBeanName' must be set for use with bean factory lookup.");
Assert.state(beanFactory != null,
"BeanFactory must be set to resolve 'adviceBeanName'");
interceptor = beanFactory.getBean(this.adviceBeanName,
MethodSecurityInterceptor.class);
}
return interceptor;
}
}
public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
this.beanFactory = beanFactory;
}
private void readObject(ObjectInputStream ois) throws IOException,
ClassNotFoundException {
ois.defaultReadObject();
adviceMonitor = new Object();
attributeSource = beanFactory.getBean(metadataSourceBeanName,
MethodSecurityMetadataSource.class);
}
// ~ Inner Classes
// ==================================================================================================
class MethodSecurityMetadataSourcePointcut extends StaticMethodMatcherPointcut
implements Serializable {
@SuppressWarnings("unchecked")
public boolean matches(Method m, Class targetClass) {
Collection attributes = attributeSource.getAttributes(m, targetClass);
return attributes != null && !attributes.isEmpty();
}
}
}