/*
* 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.vote;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.security.access.AccessDecisionManager;
import org.springframework.security.access.AccessDecisionVoter;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.core.SpringSecurityMessageSource;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.MessageSource;
import org.springframework.context.MessageSourceAware;
import org.springframework.context.support.MessageSourceAccessor;
import org.springframework.util.Assert;
/**
* Abstract implementation of {@link AccessDecisionManager}.
*
* <p>
* Handles configuration of a bean context defined list of {@link AccessDecisionVoter}s
* and the access control behaviour if all voters abstain from voting (defaults to deny
* access).
*/
public abstract class AbstractAccessDecisionManager implements AccessDecisionManager,
InitializingBean, MessageSourceAware {
// ~ Instance fields
// ================================================================================================
protected final Log logger = LogFactory.getLog(getClass());
private List<AccessDecisionVoter<? extends Object>> decisionVoters;
protected MessageSourceAccessor messages = SpringSecurityMessageSource.getAccessor();
private boolean allowIfAllAbstainDecisions = false;
protected AbstractAccessDecisionManager(
List<AccessDecisionVoter<? extends Object>> decisionVoters) {
Assert.notEmpty(decisionVoters, "A list of AccessDecisionVoters is required");
this.decisionVoters = decisionVoters;
}
// ~ Methods
// ========================================================================================================
public void afterPropertiesSet() throws Exception {
Assert.notEmpty(this.decisionVoters, "A list of AccessDecisionVoters is required");
Assert.notNull(this.messages, "A message source must be set");
}
protected final void checkAllowIfAllAbstainDecisions() {
if (!this.isAllowIfAllAbstainDecisions()) {
throw new AccessDeniedException(messages.getMessage(
"AbstractAccessDecisionManager.accessDenied", "Access is denied"));
}
}
public List<AccessDecisionVoter<? extends Object>> getDecisionVoters() {
return this.decisionVoters;
}
public boolean isAllowIfAllAbstainDecisions() {
return allowIfAllAbstainDecisions;
}
public void setAllowIfAllAbstainDecisions(boolean allowIfAllAbstainDecisions) {
this.allowIfAllAbstainDecisions = allowIfAllAbstainDecisions;
}
public void setMessageSource(MessageSource messageSource) {
this.messages = new MessageSourceAccessor(messageSource);
}
public boolean supports(ConfigAttribute attribute) {
for (AccessDecisionVoter voter : this.decisionVoters) {
if (voter.supports(attribute)) {
return true;
}
}
return false;
}
/**
* Iterates through all <code>AccessDecisionVoter</code>s and ensures each can support
* the presented class.
* <p>
* If one or more voters cannot support the presented class, <code>false</code> is
* returned.
*
* @param clazz the type of secured object being presented
* @return true if this type is supported
*/
public boolean supports(Class<?> clazz) {
for (AccessDecisionVoter voter : this.decisionVoters) {
if (!voter.supports(clazz)) {
return false;
}
}
return true;
}
}