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/*** OLAT - Online Learning and Training<br>* http://www.olat.org* <p>* Licensed under the Apache License, Version 2.0 (the "License"); <br>* you may not use this file except in compliance with the License.<br>* You may obtain a copy of the License at* <p>* http://www.apache.org/licenses/LICENSE-2.0* <p>* Unless required by applicable law or agreed to in writing,<br>* software distributed under the License is distributed on an "AS IS" BASIS, <br>* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. <br>* See the License for the specific language governing permissions and <br>* limitations under the License.* <p>* Copyright (c) since 2004 at Multimedia- & E-Learning Services (MELS),<br>* University of Zurich, Switzerland.* <hr>* <a href="http://www.openolat.org">* OpenOLAT - Online Learning and Training</a><br>* This file has been modified by the OpenOLAT community. Changes are licensed* under the Apache 2.0 license as the original file.*/package org.olat.course.config.manager;import java.io.InputStream;import java.util.HashMap;import java.util.Hashtable;import org.apache.logging.log4j.Logger;import org.olat.core.CoreSpringFactory;import org.olat.core.commons.services.vfs.VFSRepositoryService;import org.olat.core.logging.Tracing;import org.olat.core.util.vfs.VFSConstants;import org.olat.core.util.vfs.VFSItem;import org.olat.core.util.vfs.VFSLeaf;import org.olat.core.util.xml.XStreamHelper;import org.olat.course.ICourse;import org.olat.course.config.CourseConfig;import org.olat.course.config.CourseConfigManager;import org.springframework.stereotype.Service;import com.thoughtworks.xstream.XStream;import com.thoughtworks.xstream.security.ExplicitTypePermission;/** * <P> * Initial Date: Jun 3, 2005 <br> * @author patrick */@Servicepublic class CourseConfigManagerImpl implements CourseConfigManager { private static final Logger log = Tracing.createLoggerFor(CourseConfigManagerImpl.class); private static final XStream xstream = XStreamHelper.createXStreamInstance(); static { Class<?>[] types = new Class[] { CourseConfig.class, Hashtable.class, HashMap.class }; // BUG: CWE-91 XML Injection (aka Blind XPath Injection) // XStream.setupDefaultSecurity(xstream); // FIXED: xstream.addPermission(new ExplicitTypePermission(types)); } @Override public CourseConfig copyConfigOf(ICourse course) { return course.getCourseEnvironment().getCourseConfig().clone(); } @Override public boolean deleteConfigOf(ICourse course) { VFSLeaf configFile = getConfigFile(course); if (configFile != null) { return configFile.delete() == VFSConstants.YES; } return false; } @Override public CourseConfig loadConfigFor(ICourse course) { CourseConfig retVal = null; VFSLeaf configFile = getConfigFile(course); if (configFile == null) { //config file does not exist! create one, init the defaults, save it. retVal = new CourseConfig(); retVal.initDefaults(); saveConfigTo(course, retVal); } else { //file exists, load it with XStream, resolve version Object tmp = XStreamHelper.readObject(xstream, configFile); if (tmp instanceof CourseConfig) { retVal = (CourseConfig) tmp; if (retVal.resolveVersionIssues()) { saveConfigTo(course, retVal); } } } return retVal; } @Override public void saveConfigTo(ICourse course, CourseConfig courseConfig) { VFSLeaf configFile = getConfigFile(course); if (configFile == null) { // create new config file configFile = course.getCourseBaseContainer().createChildLeaf(COURSECONFIG_XML); } else if(configFile.exists() && configFile.canVersion() == VFSConstants.YES) { try(InputStream in = configFile.getInputStream()) { CoreSpringFactory.getImpl(VFSRepositoryService.class).addVersion(configFile, null, "", in); } catch (Exception e) { log.error("Cannot versioned CourseConfig.xml", e); } } XStreamHelper.writeObject(xstream, configFile, courseConfig); } /** * the configuration is saved in folder called <code>Configuration</code> * residing in the course folder * <p> * package wide visibility for the CourseConfigManagerImplTest * * @param course * @return the configuration file or null if file does not exist */ public static VFSLeaf getConfigFile(ICourse course) { VFSItem item = course.getCourseBaseContainer().resolve(COURSECONFIG_XML); return item instanceof VFSLeaf ? (VFSLeaf)item : null; }} |