org.springframework.security.access.method.DelegatingMethodSecurityMetadataSource Maven / Gradle / Ivy
/*
* Copyright 2002-2016 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.access.method;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.springframework.core.log.LogMessage;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;
/**
* Automatically tries a series of method definition sources, relying on the first source
* of metadata that provides a non-null/non-empty response. Provides automatic caching of
* the retrieved metadata.
*
* @author Ben Alex
* @author Luke Taylor
*/
public final class DelegatingMethodSecurityMetadataSource extends AbstractMethodSecurityMetadataSource {
private static final List NULL_CONFIG_ATTRIBUTE = Collections.emptyList();
private final List methodSecurityMetadataSources;
private final Map> attributeCache = new HashMap<>();
public DelegatingMethodSecurityMetadataSource(List methodSecurityMetadataSources) {
Assert.notNull(methodSecurityMetadataSources, "MethodSecurityMetadataSources cannot be null");
this.methodSecurityMetadataSources = methodSecurityMetadataSources;
}
@Override
public Collection getAttributes(Method method, Class targetClass) {
DefaultCacheKey cacheKey = new DefaultCacheKey(method, targetClass);
synchronized (this.attributeCache) {
Collection cached = this.attributeCache.get(cacheKey);
// Check for canonical value indicating there is no config attribute,
if (cached != null) {
return cached;
}
// No cached value, so query the sources to find a result
Collection attributes = null;
for (MethodSecurityMetadataSource s : this.methodSecurityMetadataSources) {
attributes = s.getAttributes(method, targetClass);
if (attributes != null && !attributes.isEmpty()) {
break;
}
}
// Put it in the cache.
if (attributes == null || attributes.isEmpty()) {
this.attributeCache.put(cacheKey, NULL_CONFIG_ATTRIBUTE);
return NULL_CONFIG_ATTRIBUTE;
}
this.logger.debug(LogMessage.format("Caching method [%s] with attributes %s", cacheKey, attributes));
this.attributeCache.put(cacheKey, attributes);
return attributes;
}
}
@Override
public Collection getAllConfigAttributes() {
Set set = new HashSet<>();
for (MethodSecurityMetadataSource s : this.methodSecurityMetadataSources) {
Collection attrs = s.getAllConfigAttributes();
if (attrs != null) {
set.addAll(attrs);
}
}
return set;
}
public List getMethodSecurityMetadataSources() {
return this.methodSecurityMetadataSources;
}
private static class DefaultCacheKey {
private final Method method;
private final Class targetClass;
DefaultCacheKey(Method method, Class targetClass) {
this.method = method;
this.targetClass = targetClass;
}
@Override
public boolean equals(Object other) {
DefaultCacheKey otherKey = (DefaultCacheKey) other;
return (this.method.equals(otherKey.method)
&& ObjectUtils.nullSafeEquals(this.targetClass, otherKey.targetClass));
}
@Override
public int hashCode() {
return this.method.hashCode() * 21 + ((this.targetClass != null) ? this.targetClass.hashCode() : 0);
}
@Override
public String toString() {
String targetClassName = (this.targetClass != null) ? this.targetClass.getName() : "-";
return "CacheKey[" + targetClassName + "; " + this.method + "]";
}
}
}