001/*
002 * Copyright 2002-2013 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.messaging.simp.annotation.support;
018
019import java.security.Principal;
020
021import org.springframework.core.MethodParameter;
022import org.springframework.messaging.Message;
023import org.springframework.messaging.handler.invocation.HandlerMethodArgumentResolver;
024import org.springframework.messaging.simp.SimpMessageHeaderAccessor;
025
026/**
027 * @author Rossen Stoyanchev
028 * @since 4.0
029 */
030public class PrincipalMethodArgumentResolver implements HandlerMethodArgumentResolver {
031
032        @Override
033        public boolean supportsParameter(MethodParameter parameter) {
034                Class<?> paramType = parameter.getParameterType();
035                return Principal.class.isAssignableFrom(paramType);
036        }
037
038        @Override
039        public Object resolveArgument(MethodParameter parameter, Message<?> message) throws Exception {
040                Principal user = SimpMessageHeaderAccessor.getUser(message.getHeaders());
041                if (user == null) {
042                        throw new MissingSessionUserException(message);
043                }
044                return user;
045        }
046
047}