| /* |
| * 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(); |
| |
| } |