spring PrincipalMethodArgumentResolver 源码
spring PrincipalMethodArgumentResolver 代码
文件路径：/spring-messaging/src/main/java/org/springframework/messaging/simp/annotation/support/PrincipalMethodArgumentResolver.java
/*
* Copyright 2002-2019 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
*
* https://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.messaging.simp.annotation.support;
import java.security.Principal;
import java.util.Optional;
import org.springframework.core.MethodParameter;
import org.springframework.messaging.Message;
import org.springframework.messaging.handler.invocation.HandlerMethodArgumentResolver;
import org.springframework.messaging.simp.SimpMessageHeaderAccessor;
/**
* Resolver for arguments of type {@link Principal}, including {@code Optional<Principal>}.
*
* @author Rossen Stoyanchev
* @since 4.0
*/
public class PrincipalMethodArgumentResolver implements HandlerMethodArgumentResolver {
@Override
public boolean supportsParameter(MethodParameter parameter) {
MethodParameter nestedParameter = parameter.nestedIfOptional();
Class<?> paramType = nestedParameter.getNestedParameterType();
return Principal.class.isAssignableFrom(paramType);
}
@Override
public Object resolveArgument(MethodParameter parameter, Message<?> message){
Principal user = SimpMessageHeaderAccessor.getUser(message.getHeaders());
return parameter.isOptional() ? Optional.ofNullable(user) : user;
}
}
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