MessagePermissionEvaluator.java

/*
 * Copyright 2002-2013 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 sample.security;

import java.io.Serializable;

import org.springframework.security.access.PermissionEvaluator;
import org.springframework.security.core.Authentication;
import sample.data.Message;
import sample.data.User;
import org.springframework.stereotype.Component;

/**
 * @author Rob Winch
 *
 */
@Component
public class MessagePermissionEvaluator implements PermissionEvaluator {
	/* (non-Javadoc)
	 * @see org.springframework.security.access.PermissionEvaluator#hasPermission(org.springframework.security.core.Authentication, java.lang.Object, java.lang.Object)
	 */
	@Override
	public boolean hasPermission(Authentication authentication,
			Object targetDomainObject, Object permission) {
		if(authentication == null) {
			return false;
		}
		Message message = (Message) targetDomainObject;
		if(message == null) {
			return true;
		}
		User currentUser = (User) authentication.getPrincipal();
		return currentUser.getId().equals(message.getTo().getId());
	}

	/* (non-Javadoc)
	 * @see org.springframework.security.access.PermissionEvaluator#hasPermission(org.springframework.security.core.Authentication, java.io.Serializable, java.lang.String, java.lang.Object)
	 */
	@Override
	public boolean hasPermission(Authentication authentication,
			Serializable targetId, String targetType, Object permission) {
		throw new UnsupportedOperationException();
	}

}