1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package org.apache.harmony.javax.security.auth.login; 19 20 import java.security.AccessController; 21 import org.apache.harmony.javax.security.auth.AuthPermission; 22 23 public abstract class Configuration { 24 25 // the current configuration 26 private static Configuration configuration; 27 28 // creates a AuthPermission object with a specify property 29 private static final AuthPermission GET_LOGIN_CONFIGURATION = new AuthPermission( 30 "getLoginConfiguration"); //$NON-NLS-1$ 31 32 // creates a AuthPermission object with a specify property 33 private static final AuthPermission SET_LOGIN_CONFIGURATION = new AuthPermission( 34 "setLoginConfiguration"); //$NON-NLS-1$ 35 36 // Key to security properties, defining default configuration provider. 37 private static final String LOGIN_CONFIGURATION_PROVIDER = "login.configuration.provider"; //$NON-NLS-1$ 38 Configuration()39 protected Configuration() { 40 super(); 41 } 42 getConfiguration()43 public static Configuration getConfiguration() { 44 SecurityManager sm = System.getSecurityManager(); 45 if (sm != null) { 46 sm.checkPermission(GET_LOGIN_CONFIGURATION); 47 } 48 return getAccessibleConfiguration(); 49 } 50 51 /** 52 * Reads name of default configuration provider from security.properties, 53 * loads the class and instantiates the provider.<br> In case of any 54 * exception, wraps it with SecurityException and throws further. 55 */ getDefaultProvider()56 private static final Configuration getDefaultProvider() { 57 return new Configuration() { 58 59 @Override 60 public void refresh() { 61 } 62 63 @Override 64 public AppConfigurationEntry[] getAppConfigurationEntry( 65 String applicationName) { 66 return new AppConfigurationEntry[0]; 67 } 68 }; 69 } 70 71 /** 72 * Shortcut accessor for friendly classes, to skip security checks. 73 * If active configuration was set to <code>null</code>, tries to load a default 74 * provider, so this method never returns <code>null</code>. <br> 75 * This method is synchronized with setConfiguration() 76 */ 77 static Configuration getAccessibleConfiguration() { 78 Configuration current = configuration; 79 if (current == null) { 80 synchronized (Configuration.class) { 81 if (configuration == null) { 82 configuration = getDefaultProvider(); 83 } 84 return configuration; 85 } 86 } 87 return current; 88 } 89 90 public static void setConfiguration(Configuration configuration) { 91 SecurityManager sm = System.getSecurityManager(); 92 if (sm != null) { 93 sm.checkPermission(SET_LOGIN_CONFIGURATION); 94 } 95 Configuration.configuration = configuration; 96 } 97 98 public abstract AppConfigurationEntry[] getAppConfigurationEntry(String applicationName); 99 100 public abstract void refresh(); 101 102 } 103