spring ApplicationContextServerWebExchangeMatcher 源码
springboot ApplicationContextServerWebExchangeMatcher 代码
文件路径:/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/security/reactive/ApplicationContextServerWebExchangeMatcher.java
/*
* Copyright 2012-2020 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.boot.security.reactive;
import java.util.function.Supplier;
import reactor.core.publisher.Mono;
import org.springframework.beans.factory.config.AutowireCapableBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.security.web.server.util.matcher.ServerWebExchangeMatcher;
import org.springframework.util.Assert;
import org.springframework.web.server.ServerWebExchange;
/**
* {@link ApplicationContext} backed {@link ServerWebExchangeMatcher}. Can work directly
* with the {@link ApplicationContext}, obtain an existing bean or
* {@link AutowireCapableBeanFactory#createBean(Class, int, boolean) create a new bean}
* that is autowired in the usual way.
*
* @param <C> the type of the context that the match method actually needs to use. Can be
* an {@link ApplicationContext} or a class of an {@link ApplicationContext#getBean(Class)
* existing bean}.
* @author Madhura Bhave
* @since 2.0.0
*/
public abstract class ApplicationContextServerWebExchangeMatcher<C> implements ServerWebExchangeMatcher {
private final Class<? extends C> contextClass;
private volatile Supplier<C> context;
private final Object contextLock = new Object();
public ApplicationContextServerWebExchangeMatcher(Class<? extends C> contextClass) {
Assert.notNull(contextClass, "Context class must not be null");
this.contextClass = contextClass;
}
@Override
public final Mono<MatchResult> matches(ServerWebExchange exchange) {
if (ignoreApplicationContext(exchange.getApplicationContext())) {
return MatchResult.notMatch();
}
return matches(exchange, getContext(exchange));
}
/**
* Decides whether the rule implemented by the strategy matches the supplied exchange.
* @param exchange the source exchange
* @param context a supplier for the initialized context (may throw an exception)
* @return if the exchange matches
*/
protected abstract Mono<MatchResult> matches(ServerWebExchange exchange, Supplier<C> context);
/**
* Returns if the {@link ApplicationContext} should be ignored and not used for
* matching. If this method returns {@code true} then the context will not be used and
* the {@link #matches(ServerWebExchange) matches} method will return {@code false}.
* @param applicationContext the candidate application context
* @return if the application context should be ignored
* @since 2.2.5
*/
protected boolean ignoreApplicationContext(ApplicationContext applicationContext) {
return false;
}
protected Supplier<C> getContext(ServerWebExchange exchange) {
if (this.context == null) {
synchronized (this.contextLock) {
if (this.context == null) {
Supplier<C> createdContext = createContext(exchange);
initialized(createdContext);
this.context = createdContext;
}
}
}
return this.context;
}
/**
* Called once the context has been initialized.
* @param context a supplier for the initialized context (may throw an exception)
*/
protected void initialized(Supplier<C> context) {
}
@SuppressWarnings("unchecked")
private Supplier<C> createContext(ServerWebExchange exchange) {
ApplicationContext context = exchange.getApplicationContext();
Assert.state(context != null, "No ApplicationContext found on ServerWebExchange.");
if (this.contextClass.isInstance(context)) {
return () -> (C) context;
}
return () -> context.getBean(this.contextClass);
}
}
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