spring security AuthenticationPrincipal 源码
spring security AuthenticationPrincipal 代码
文件路径：/core/src/main/java/org/springframework/security/core/annotation/AuthenticationPrincipal.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
*
* 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.security.core.annotation;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.springframework.security.core.Authentication;
/**
* Annotation that is used to resolve {@link Authentication#getPrincipal()} to a method
* argument.
*
* @author Rob Winch
* @since 4.0
*
* See: <a href=
* "{@docRoot}/org/springframework/security/web/method/annotation/AuthenticationPrincipalArgumentResolver.html"
* > AuthenticationPrincipalArgumentResolver </a>
*/
@Target({ ElementType.PARAMETER, ElementType.ANNOTATION_TYPE })
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface AuthenticationPrincipal {
/**
* True if a {@link ClassCastException} should be thrown when the current
* {@link Authentication#getPrincipal()} is the incorrect type. Default is false.
* @return
*/
boolean errorOnInvalidType() default false;
/**
* If specified will use the provided SpEL expression to resolve the principal. This
* is convenient if users need to transform the result.
*
* <p>
* For example, perhaps the user wants to resolve a CustomUser object that is final
* and is leveraging a UserDetailsService. This can be handled by returning an object
* that looks like:
* </p>
*
* <pre>
* public class CustomUserUserDetails extends User {
* // ...
* public CustomUser getCustomUser() {
* return customUser;
* }
* }
* </pre>
*
* Then the user can specify an annotation that looks like:
*
* <pre>
* @AuthenticationPrincipal(expression = "customUser")
* </pre>
* @return the expression to use.
*/
String expression() default "";
}
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