org.apache.flink.runtime.security.DynamicConfiguration Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
*
* http://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.apache.flink.runtime.security;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.annotation.Nullable;
import javax.security.auth.login.AppConfigurationEntry;
import javax.security.auth.login.Configuration;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
/**
* A dynamic JAAS configuration.
*
* Makes it possible to define Application Configuration Entries (ACEs) at runtime, building upon
* an (optional) underlying configuration. Entries from the underlying configuration take
* precedence over dynamic entries.
*/
public class DynamicConfiguration extends Configuration {
protected static final Logger LOG = LoggerFactory.getLogger(DynamicConfiguration.class);
private final Configuration delegate;
private final Map dynamicEntries = new HashMap<>();
/**
* Create a dynamic configuration.
* @param delegate an underlying configuration to delegate to, or null.
*/
public DynamicConfiguration(@Nullable Configuration delegate) {
this.delegate = delegate;
}
/**
* Add entries for the given application name.
*/
public void addAppConfigurationEntry(String name, AppConfigurationEntry... entry) {
final AppConfigurationEntry[] existing = dynamicEntries.get(name);
final AppConfigurationEntry[] updated;
if (existing == null) {
updated = Arrays.copyOf(entry, entry.length);
}
else {
updated = merge(existing, entry);
}
dynamicEntries.put(name, updated);
}
/**
* Retrieve the AppConfigurationEntries for the specified name
* from this Configuration.
*
* @param name the name used to index the Configuration.
*
* @return an array of AppConfigurationEntries for the specified name
* from this Configuration, or null if there are no entries
* for the specified name
*/
@Override
public AppConfigurationEntry[] getAppConfigurationEntry(String name) {
AppConfigurationEntry[] entry = null;
if (delegate != null) {
entry = delegate.getAppConfigurationEntry(name);
}
final AppConfigurationEntry[] existing = dynamicEntries.get(name);
if (existing != null) {
if (entry != null) {
entry = merge(entry, existing);
}
else {
entry = Arrays.copyOf(existing, existing.length);
}
}
return entry;
}
private static AppConfigurationEntry[] merge(AppConfigurationEntry[] a, AppConfigurationEntry[] b) {
AppConfigurationEntry[] merged = Arrays.copyOf(a, a.length + b.length);
System.arraycopy(b, 0, merged, a.length, b.length);
return merged;
}
@Override
public void refresh() {
if (delegate != null) {
delegate.refresh();
}
}
}