| /* |
| * 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.geode.internal.security; |
| |
| import static org.apache.geode.distributed.ConfigurationProperties.SECURITY_MANAGER; |
| import static org.apache.geode.distributed.ConfigurationProperties.SECURITY_POST_PROCESSOR; |
| import static org.apache.geode.internal.ClassLoadUtil.classFromName; |
| import static org.apache.geode.internal.ClassLoadUtil.methodFromName; |
| |
| import java.lang.reflect.Method; |
| import java.util.Properties; |
| |
| import org.apache.commons.lang3.StringUtils; |
| |
| import org.apache.geode.security.GemFireSecurityException; |
| import org.apache.geode.security.PostProcessor; |
| import org.apache.geode.security.SecurityManager; |
| |
| /** |
| * Utility methods for instantiating security callback objects by reflection. |
| */ |
| public class CallbackInstantiator { |
| |
| /** |
| * this method would never return null, it either throws an exception or returns an object |
| */ |
| public static <T> T getObjectOfTypeFromClassName(String className, Class<T> expectedClazz) { |
| Class actualClass; |
| try { |
| actualClass = classFromName(className); |
| } catch (Exception e) { |
| throw new GemFireSecurityException("Instance could not be obtained, " + e, e); |
| } |
| |
| if (!expectedClazz.isAssignableFrom(actualClass)) { |
| throw new GemFireSecurityException( |
| "Instance could not be obtained. Expecting a " + expectedClazz.getName() + " class."); |
| } |
| |
| try { |
| return (T) actualClass.newInstance(); |
| } catch (Exception e) { |
| throw new GemFireSecurityException( |
| "Instance could not be obtained. Error instantiating " + actualClass.getName(), e); |
| } |
| } |
| |
| public static SecurityManager getSecurityManager(Properties properties) { |
| String securityManagerConfig = properties.getProperty(SECURITY_MANAGER); |
| if (StringUtils.isBlank(securityManagerConfig)) { |
| return null; |
| } |
| SecurityManager securityManager = |
| getObjectOfTypeFromClassName(securityManagerConfig, SecurityManager.class); |
| securityManager.init(properties); |
| return securityManager; |
| } |
| |
| public static PostProcessor getPostProcessor(Properties properties) { |
| String postProcessorConfig = properties.getProperty(SECURITY_POST_PROCESSOR); |
| if (StringUtils.isBlank(postProcessorConfig)) { |
| return null; |
| } |
| PostProcessor postProcessor = |
| getObjectOfTypeFromClassName(postProcessorConfig, PostProcessor.class); |
| postProcessor.init(properties); |
| return postProcessor; |
| } |
| |
| /** |
| * this method would never return null, it either throws an exception or returns an object |
| */ |
| private static <T> T getObjectOfTypeFromFactoryMethod(String factoryMethodName) { |
| T actualObject; |
| try { |
| Method factoryMethod = methodFromName(factoryMethodName); |
| actualObject = (T) factoryMethod.invoke(null, (Object[]) null); |
| } catch (Exception e) { |
| throw new GemFireSecurityException("Instance could not be obtained from " + factoryMethodName, |
| e); |
| } |
| |
| if (actualObject == null) { |
| throw new GemFireSecurityException( |
| "Instance could not be obtained from " + factoryMethodName); |
| } |
| |
| return actualObject; |
| } |
| |
| /** |
| * this method would never return null, it either throws an exception or returns an object |
| * |
| * @return an object of type expectedClazz. This method would never return null. It either returns |
| * an non-null object or throws exception. |
| */ |
| public static <T> T getObjectOfType(String classOrMethod, Class<T> expectedClazz) { |
| T object; |
| try { |
| object = getObjectOfTypeFromClassName(classOrMethod, expectedClazz); |
| } catch (Exception ignore) { |
| object = getObjectOfTypeFromFactoryMethod(classOrMethod); |
| } |
| return object; |
| } |
| } |