/*
 * Copyright 2015 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.statemachine.security;

import org.springframework.messaging.Message;
import org.springframework.security.access.expression.AbstractSecurityExpressionHandler;
import org.springframework.security.access.expression.SecurityExpressionHandler;
import org.springframework.security.access.expression.SecurityExpressionOperations;
import org.springframework.security.authentication.AuthenticationTrustResolver;
import org.springframework.security.authentication.AuthenticationTrustResolverImpl;
import org.springframework.security.core.Authentication;
import org.springframework.util.Assert;

/**
 * The default implementation of {@link SecurityExpressionHandler} which uses a
 * {@link EventSecurityExpressionRoot}.
 *
 * @param <T> the type for the body of the Message
 *
 * @author Rob Winch
 * @author Janne Valkealahti
 */
public class DefaultEventSecurityExpressionHandler<T> extends
		AbstractSecurityExpressionHandler<Message<T>> {

	private AuthenticationTrustResolver trustResolver = new AuthenticationTrustResolverImpl();

	@Override
	protected SecurityExpressionOperations createSecurityExpressionRoot(
			Authentication authentication, Message<T> invocation) {
		EventSecurityExpressionRoot root = new EventSecurityExpressionRoot(
				authentication, invocation);
		root.setPermissionEvaluator(getPermissionEvaluator());
		root.setTrustResolver(trustResolver);
		root.setRoleHierarchy(getRoleHierarchy());
		return root;
	}

	public void setTrustResolver(AuthenticationTrustResolver trustResolver) {
		Assert.notNull(trustResolver, "trustResolver cannot be null");
		this.trustResolver = trustResolver;
	}
}
