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WebExpressionVoter.java
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WebExpressionVoter.java
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/* Copyright 2006-2012 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.codehaus.groovy.grails.plugins.springsecurity;
import java.util.Collection;
import org.springframework.expression.EvaluationContext;
import org.springframework.security.access.AccessDecisionVoter;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.access.expression.ExpressionUtils;
import org.springframework.security.core.Authentication;
import org.springframework.security.web.FilterInvocation;
import org.springframework.security.web.access.expression.WebSecurityExpressionHandler;
import org.springframework.util.Assert;
/**
* Based on the class of the same name in Spring Security which uses the
* package-default WebExpressionConfigAttribute.
*
* @author <a href='mailto:burt@burtbeckwith.com'>Burt Beckwith</a>
*/
public class WebExpressionVoter implements AccessDecisionVoter {
private WebSecurityExpressionHandler _expressionHandler;
/**
* {@inheritDoc}
* @see org.springframework.security.access.AccessDecisionVoter#vote(
* org.springframework.security.core.Authentication, java.lang.Object, java.util.Collection)
*/
public int vote(final Authentication authentication, final Object object,
final Collection<ConfigAttribute> attributes) {
Assert.notNull(authentication, "authentication cannot be null");
Assert.notNull(object, "object cannot be null");
Assert.notNull(attributes, "attributes cannot be null");
WebExpressionConfigAttribute weca = findConfigAttribute(attributes);
if (weca == null) {
return ACCESS_ABSTAIN;
}
FilterInvocation fi = (FilterInvocation)object;
EvaluationContext ctx = _expressionHandler.createEvaluationContext(authentication, fi);
return ExpressionUtils.evaluateAsBoolean(weca.getAuthorizeExpression(), ctx) ?
ACCESS_GRANTED : ACCESS_DENIED;
}
private WebExpressionConfigAttribute findConfigAttribute(final Collection<ConfigAttribute> attributes) {
for (ConfigAttribute attribute : attributes) {
if (attribute instanceof WebExpressionConfigAttribute) {
return (WebExpressionConfigAttribute)attribute;
}
}
return null;
}
/**
* {@inheritDoc}
* @see org.springframework.security.access.AccessDecisionVoter#supports(
* org.springframework.security.access.ConfigAttribute)
*/
public boolean supports(ConfigAttribute attribute) {
return attribute instanceof WebExpressionConfigAttribute;
}
/**
* {@inheritDoc}
* @see org.springframework.security.access.AccessDecisionVoter#supports(java.lang.Class)
*/
public boolean supports(Class<?> clazz) {
return clazz.isAssignableFrom(FilterInvocation.class);
}
/**
* Dependency injection for the expression handler.
* @param expressionHandler the handler
*/
public void setExpressionHandler(final WebSecurityExpressionHandler expressionHandler) {
_expressionHandler = expressionHandler;
}
}