ChannelSecurityInterceptor.java :  » J2EE » spring-integration-2.0.0.M2 » org » springframework » integration » security » channel » Java Open Source

/*
 * Copyright 2002-2008 the original author or authors.
 *
 * 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.integration.security.channel;

import java.lang.reflect.Method;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;

import org.springframework.security.intercept.AbstractSecurityInterceptor;
import org.springframework.security.intercept.InterceptorStatusToken;
import org.springframework.security.intercept.ObjectDefinitionSource;
import org.springframework.util.Assert;

/**
 * An AOP interceptor that enforces authorization for MessageChannel send and/or receive calls.
 * 
 * @author Mark Fisher
 */
public class ChannelSecurityInterceptor extends AbstractSecurityInterceptor implements MethodInterceptor {

  private final ChannelInvocationDefinitionSource objectDefinitionSource;


  public ChannelSecurityInterceptor(ChannelInvocationDefinitionSource objectDefinitionSource) {
    Assert.notNull(objectDefinitionSource, "objectDefinitionSource must not be null");
    this.objectDefinitionSource = objectDefinitionSource;
  }


  @Override
  public Class<?> getSecureObjectClass() {
    return ChannelInvocation.class;
  }

  @Override
  public ObjectDefinitionSource obtainObjectDefinitionSource() {
    return this.objectDefinitionSource;
  }

  public Object invoke(MethodInvocation invocation) throws Throwable {
    Method method = invocation.getMethod();
    if (method.getName().equals("send") || method.getName().equals("receive")) {
      return this.invokeWithAuthorizationCheck(invocation);
    }
    return invocation.proceed();
  }

  private Object invokeWithAuthorizationCheck(MethodInvocation methodInvocation) throws Throwable {
    Object returnValue = null;
    InterceptorStatusToken token = super.beforeInvocation(new ChannelInvocation(methodInvocation));
    try {
      returnValue = methodInvocation.proceed();
    }
    finally {
      returnValue = super.afterInvocation(token, returnValue);
    }
    return returnValue;
  }

}