org.springframework.security.web.access.expression.WebExpressionVoter Maven / Gradle / Ivy
/*
* Copyright 2002-2016 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.security.web.access.expression;
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.access.expression.SecurityExpressionHandler;
import org.springframework.security.core.Authentication;
import org.springframework.security.web.FilterInvocation;
/**
* Voter which handles web authorisation decisions.
* @author Luke Taylor
* @since 3.0
*/
public class WebExpressionVoter implements AccessDecisionVoter {
private SecurityExpressionHandler expressionHandler = new DefaultWebSecurityExpressionHandler();
public int vote(Authentication authentication, FilterInvocation fi,
Collection attributes) {
assert authentication != null;
assert fi != null;
assert attributes != null;
WebExpressionConfigAttribute weca = findConfigAttribute(attributes);
if (weca == null) {
return ACCESS_ABSTAIN;
}
EvaluationContext ctx = expressionHandler.createEvaluationContext(authentication,
fi);
ctx = weca.postProcess(ctx, fi);
return ExpressionUtils.evaluateAsBoolean(weca.getAuthorizeExpression(), ctx) ? ACCESS_GRANTED
: ACCESS_DENIED;
}
private WebExpressionConfigAttribute findConfigAttribute(
Collection attributes) {
for (ConfigAttribute attribute : attributes) {
if (attribute instanceof WebExpressionConfigAttribute) {
return (WebExpressionConfigAttribute) attribute;
}
}
return null;
}
public boolean supports(ConfigAttribute attribute) {
return attribute instanceof WebExpressionConfigAttribute;
}
public boolean supports(Class clazz) {
return FilterInvocation.class.isAssignableFrom(clazz);
}
public void setExpressionHandler(
SecurityExpressionHandler expressionHandler) {
this.expressionHandler = expressionHandler;
}
}