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/*
* 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.harmony.javax.security.auth.login;
import java.security.AccessController;
import org.apache.harmony.javax.security.auth.AuthPermission;
public abstract class Configuration {
// the current configuration
private static Configuration configuration;
// creates a AuthPermission object with a specify property
private static final AuthPermission GET_LOGIN_CONFIGURATION = new AuthPermission(
"getLoginConfiguration"); //$NON-NLS-1$
// creates a AuthPermission object with a specify property
private static final AuthPermission SET_LOGIN_CONFIGURATION = new AuthPermission(
"setLoginConfiguration"); //$NON-NLS-1$
// Key to security properties, defining default configuration provider.
private static final String LOGIN_CONFIGURATION_PROVIDER = "login.configuration.provider"; //$NON-NLS-1$
protected Configuration() {
super();
}
public static Configuration getConfiguration() {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(GET_LOGIN_CONFIGURATION);
}
return getAccessibleConfiguration();
}
/**
* Reads name of default configuration provider from security.properties,
* loads the class and instantiates the provider.<br> In case of any
* exception, wraps it with SecurityException and throws further.
*/
private static final Configuration getDefaultProvider() {
return new Configuration() {
@Override
public void refresh() {
}
@Override
public AppConfigurationEntry[] getAppConfigurationEntry(
String applicationName) {
return new AppConfigurationEntry[0];
}
};
}
/**
* Shortcut accessor for friendly classes, to skip security checks.
* If active configuration was set to <code>null</code>, tries to load a default
* provider, so this method never returns <code>null</code>. <br>
* This method is synchronized with setConfiguration()
*/
static Configuration getAccessibleConfiguration() {
Configuration current = configuration;
if (current == null) {
synchronized (Configuration.class) {
if (configuration == null) {
configuration = getDefaultProvider();
}
return configuration;
}
}
return current;
}
public static void setConfiguration(Configuration configuration) {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(SET_LOGIN_CONFIGURATION);
}
Configuration.configuration = configuration;
}
public abstract AppConfigurationEntry[] getAppConfigurationEntry(String applicationName);
public abstract void refresh();
}
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