org.springframework.boot.security.servlet.ApplicationContextRequestMatcher Maven / Gradle / Ivy
/*
* Copyright 2012-2018 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.servlet;
import java.util.function.Supplier;
import javax.servlet.http.HttpServletRequest;
import org.springframework.beans.factory.config.AutowireCapableBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.security.web.util.matcher.RequestMatcher;
import org.springframework.util.Assert;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
/**
* {@link ApplicationContext} backed {@link RequestMatcher}. 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 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 Phillip Webb
* @since 2.0.0
*/
public abstract class ApplicationContextRequestMatcher implements RequestMatcher {
private final Class contextClass;
private volatile Supplier context;
private final Object contextLock = new Object();
public ApplicationContextRequestMatcher(Class contextClass) {
Assert.notNull(contextClass, "Context class must not be null");
this.contextClass = contextClass;
}
@Override
public final boolean matches(HttpServletRequest request) {
return matches(request, getContext(request));
}
/**
* Decides whether the rule implemented by the strategy matches the supplied request.
* @param request the source request
* @param context a supplier for the initialized context (may throw an exception)
* @return if the request matches
*/
protected abstract boolean matches(HttpServletRequest request, Supplier context);
private Supplier getContext(HttpServletRequest request) {
if (this.context == null) {
synchronized (this.contextLock) {
if (this.context == null) {
Supplier createdContext = createContext(request);
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 context) {
}
@SuppressWarnings("unchecked")
private Supplier createContext(HttpServletRequest request) {
WebApplicationContext context = WebApplicationContextUtils
.getRequiredWebApplicationContext(request.getServletContext());
if (this.contextClass.isInstance(context)) {
return () -> (C) context;
}
return () -> context.getBean(this.contextClass);
}
}