/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH (http://www.alkacon.com)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* For further information about Alkacon Software GmbH, please see the
* company website: http://www.alkacon.com
*
* For further information about OpenCms, please see the
* project website: http://www.opencms.org
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.opencms.configuration;
import org.opencms.i18n.CmsEncoder;
import org.opencms.main.CmsLog;
import org.opencms.util.CmsFileUtil;
import org.opencms.xml.CmsXmlEntityResolver;
import org.opencms.xml.CmsXmlErrorHandler;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import org.apache.commons.digester.Digester;
import org.apache.commons.logging.Log;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.dom.DOMDocumentType;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;
import org.xml.sax.SAXException;
/**
* Configuration manager for digesting the OpenCms XML configuration.<p>
*
* Reads the individual configuration class nodes first and creaes new
* instances of the "base" configuration classes.<p>
*
* @since 6.0.0
*/
public class CmsConfigurationManager implements I_CmsXmlConfiguration {
/** The location of the OpenCms configuration DTD if the default prefix is the system ID. */
public static final String DEFAULT_DTD_LOCATION = "org/opencms/configuration/";
/** The default prefix for the OpenCms configuration DTD. */
public static final String DEFAULT_DTD_PREFIX = "http://www.opencms.org/dtd/6.0/";
/** The name of the default XML file for this configuration. */
public static final String DEFAULT_XML_FILE_NAME = "opencms.xml";
/** The name of the DTD file for this configuration. */
public static final String DTD_FILE_NAME = "opencms-configuration.dtd";
/** The "opencms" root node of the XML configuration. */
public static final String N_ROOT = "opencms";
/** Postfix for original configuration files. */
public static final String POSTFIX_ORI = ".ori";
/** The config node. */
protected static final String N_CONFIG = "config";
/** The configurations node. */
protected static final String N_CONFIGURATION = "configuration";
/** Date format for the backup file time prefix. */
private static final SimpleDateFormat BACKUP_DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss_");
/** The log object for this class. */
private static final Log LOG = CmsLog.getLog(CmsConfigurationManager.class);
/** The number of days to keep old backups for. */
private static final long MAX_BACKUP_DAYS = 15;
/** The folder where to store the backup files of the configuration. */
private File m_backupFolder;
/** The base folder where the configuration files are located. */
private File m_baseFolder;
/** The initialized configuration classes. */
private List<I_CmsXmlConfiguration> m_configurations;
/** The digester for reading the XML configuration. */
private Digester m_digester;
/** The configuration based on <code>opencms.properties</code>. */
private CmsParameterConfiguration m_propertyConfiguration;
/**
* Creates a new OpenCms configuration manager.<p>
*
* @param baseFolder base folder where XML configurations to load are located
*/
public CmsConfigurationManager(String baseFolder) {
m_baseFolder = new File(baseFolder);
if (!m_baseFolder.exists()) {
if (LOG.isErrorEnabled()) {
LOG.error(Messages.get().getBundle().key(
Messages.LOG_INVALID_CONFIG_BASE_FOLDER_1,
m_baseFolder.getAbsolutePath()));
}
}
m_backupFolder = new File(m_baseFolder.getAbsolutePath() + File.separatorChar + "backup");
if (!m_backupFolder.exists()) {
if (LOG.isDebugEnabled()) {
LOG.debug(Messages.get().getBundle().key(
Messages.LOG_CREATE_CONFIG_BKP_FOLDER_1,
m_backupFolder.getAbsolutePath()));
}
m_backupFolder.mkdirs();
}
if (LOG.isDebugEnabled()) {
LOG.debug(Messages.get().getBundle().key(Messages.LOG_CONFIG_BASE_FOLDER_1, m_baseFolder.getAbsolutePath()));
LOG.debug(Messages.get().getBundle().key(Messages.LOG_CONFIG_BKP_FOLDER_1, m_backupFolder.getAbsolutePath()));
}
cacheDtdSystemId(this);
m_configurations = new ArrayList<I_CmsXmlConfiguration>();
}
/**
* Adds a configuration object to the configuration manager.<p>
*
* @param configuration the configuration to add
*/
public void addConfiguration(I_CmsXmlConfiguration configuration) {
if (LOG.isDebugEnabled()) {
LOG.debug(Messages.get().getBundle().key(Messages.LOG_ADD_CONFIG_1, configuration));
}
m_configurations.add(configuration);
cacheDtdSystemId(configuration);
}
/**
* @see org.opencms.configuration.I_CmsConfigurationParameterHandler#addConfigurationParameter(java.lang.String, java.lang.String)
*/
public void addConfigurationParameter(String paramName, String paramValue) {
// noop, this configuration has no additional parameters
}
/**
* @see org.opencms.configuration.I_CmsXmlConfiguration#addXmlDigesterRules(org.apache.commons.digester.Digester)
*/
public void addXmlDigesterRules(Digester digester) {
// add rule for <configuration> node
digester.addObjectCreate(
"*/" + N_CONFIGURATION + "/" + N_CONFIG,
I_CmsXmlConfiguration.A_CLASS,
CmsConfigurationException.class);
digester.addSetNext("*/" + N_CONFIGURATION + "/" + N_CONFIG, "addConfiguration");
}
/**
* @see org.opencms.configuration.I_CmsXmlConfiguration#generateXml(org.dom4j.Element)
*/
public Element generateXml(Element parent) {
// add the <configuration> node
Element configurationElement = parent.addElement(N_CONFIGURATION);
for (int i = 0; i < m_configurations.size(); i++) {
// append the individual configuration
I_CmsXmlConfiguration configuration = m_configurations.get(i);
configurationElement.addElement(N_CONFIG).addAttribute(
I_CmsXmlConfiguration.A_CLASS,
configuration.getClass().getName());
}
return parent;
}
/**
* Creates the XML document build from the provided configuration.<p>
*
* @param configuration the configuration to build the XML for
* @return the XML document build from the provided configuration
*/
public Document generateXml(I_CmsXmlConfiguration configuration) {
// create a new document
Document result = DocumentHelper.createDocument();
// set the document type
DOMDocumentType docType = new DOMDocumentType();
docType.setElementName(N_ROOT);
docType.setSystemID(configuration.getDtdUrlPrefix() + configuration.getDtdFilename());
result.setDocType(docType);
Element root = result.addElement(N_ROOT);
// start the XML generation
configuration.generateXml(root);
// return the resulting document
return result;
}
/**
* Returns the backup folder.<p>
*
* @return the backup folder
*/
public File getBackupFolder() {
return m_backupFolder;
}
/**
* Returns the properties read from <code>opencms.properties</code>.<p>
*
* @see #setConfiguration(CmsParameterConfiguration)
* @see org.opencms.configuration.I_CmsConfigurationParameterHandler#getConfiguration()
*/
public CmsParameterConfiguration getConfiguration() {
return m_propertyConfiguration;
}
/**
* Returns a specific configuration from the list of initialized configurations.<p>
*
* @param clazz the configuration class that should be returned
* @return the initialized configuration class instance, or <code>null</code> if this is not found
*/
public I_CmsXmlConfiguration getConfiguration(Class<?> clazz) {
for (int i = 0; i < m_configurations.size(); i++) {
I_CmsXmlConfiguration configuration = m_configurations.get(i);
if (clazz.equals(configuration.getClass())) {
return configuration;
}
}
return null;
}
/**
* Returns the list of all initialized configurations.<p>
*
* @return the list of all initialized configurations
*/
public List<I_CmsXmlConfiguration> getConfigurations() {
return m_configurations;
}
/**
* @see org.opencms.configuration.I_CmsXmlConfiguration#getDtdFilename()
*/
public String getDtdFilename() {
return DTD_FILE_NAME;
}
/**
* @see org.opencms.configuration.I_CmsXmlConfiguration#getDtdSystemLocation()
*/
public String getDtdSystemLocation() {
return DEFAULT_DTD_LOCATION;
}
/**
* @see org.opencms.configuration.I_CmsXmlConfiguration#getDtdUrlPrefix()
*/
public String getDtdUrlPrefix() {
return DEFAULT_DTD_PREFIX;
}
/**
* @see org.opencms.configuration.I_CmsXmlConfiguration#getXmlFileName()
*/
public String getXmlFileName() {
return DEFAULT_XML_FILE_NAME;
}
/**
* @see org.opencms.configuration.I_CmsConfigurationParameterHandler#initConfiguration()
*/
public void initConfiguration() {
// does not need to be initialized
if (LOG.isDebugEnabled()) {
LOG.debug(Messages.get().getBundle().key(Messages.LOG_INIT_CONFIGURATION_1, this));
}
}
/**
* Loads the OpenCms configuration from the given XML file.<p>
*
* @throws SAXException in case of XML parse errors
* @throws IOException in case of file IO errors
*/
public void loadXmlConfiguration() throws SAXException, IOException {
URL baseUrl = m_baseFolder.toURI().toURL();
if (LOG.isDebugEnabled()) {
LOG.debug(Messages.get().getBundle().key(Messages.LOG_BASE_URL_1, baseUrl));
}
// first load the base configuration
loadXmlConfiguration(baseUrl, this);
// now iterate all sub-configurations
Iterator<I_CmsXmlConfiguration> i = m_configurations.iterator();
while (i.hasNext()) {
loadXmlConfiguration(baseUrl, i.next());
}
// remove the old backups
removeOldBackups(MAX_BACKUP_DAYS);
}
/**
* Sets the configuration read from the <code>opencms.properties</code>.<p>
*
* @param propertyConfiguration the configuration read from the <code>opencms.properties</code>
*
* @see #getConfiguration()
*/
public void setConfiguration(CmsParameterConfiguration propertyConfiguration) {
m_propertyConfiguration = propertyConfiguration;
}
/**
* Writes the XML configuration for the provided configuration instance.<p>
*
* @param clazz the configuration class to write the XML for
* @throws IOException in case of I/O errors while writing
* @throws CmsConfigurationException if the given class is not a valid configuration class
*/
public void writeConfiguration(Class<?> clazz) throws IOException, CmsConfigurationException {
I_CmsXmlConfiguration configuration = getConfiguration(clazz);
if (configuration == null) {
throw new CmsConfigurationException(Messages.get().container(
Messages.ERR_CONFIG_WITH_UNKNOWN_CLASS_1,
clazz.getName()));
}
// generate the file URL for the XML input
File file = new File(m_baseFolder, configuration.getXmlFileName());
if (LOG.isDebugEnabled()) {
LOG.debug(Messages.get().getBundle().key(Messages.LOG_WRITE_CONFIG_XMLFILE_1, file.getAbsolutePath()));
}
// generate the XML document
Document config = generateXml(configuration);
// output the document
XMLWriter writer = null;
OutputFormat format = OutputFormat.createPrettyPrint();
format.setIndentSize(4);
format.setTrimText(false);
format.setEncoding(CmsEncoder.ENCODING_UTF_8);
try {
OutputStream out = new FileOutputStream(file);
writer = new XMLWriter(out, format);
writer.write(config);
writer.flush();
} finally {
if (writer != null) {
writer.close();
}
}
if (LOG.isInfoEnabled()) {
LOG.info(Messages.get().getBundle().key(
Messages.LOG_WRITE_CONFIG_SUCCESS_2,
file.getAbsolutePath(),
configuration.getClass().getName()));
}
}
/**
* Creates a backup of the given XML configurations input file.<p>
*
* @param configuration the configuration for which the input file should be backed up
*/
private void backupXmlConfiguration(I_CmsXmlConfiguration configuration) {
String fromName = m_baseFolder.getAbsolutePath() + File.separatorChar + configuration.getXmlFileName();
String toDatePrefix = BACKUP_DATE_FORMAT.format(new Date());
String toName = m_backupFolder.getAbsolutePath()
+ File.separatorChar
+ toDatePrefix
+ configuration.getXmlFileName();
if (LOG.isDebugEnabled()) {
LOG.debug(Messages.get().getBundle().key(Messages.LOG_CREATE_CONFIG_BKP_2, fromName, toName));
}
try {
CmsFileUtil.copy(fromName, toName);
} catch (IOException e) {
LOG.error(Messages.get().getBundle().key(Messages.LOG_CREATE_CONFIG_BKP_FAILURE_1, toName), e);
}
}
/**
* Adds a new DTD system id prefix mapping for internal resolution of external URLs.<p>
*
* @param configuration the configuration to add the mapping from
*/
private void cacheDtdSystemId(I_CmsXmlConfiguration configuration) {
if (configuration.getDtdSystemLocation() != null) {
try {
String file = CmsFileUtil.readFile(
configuration.getDtdSystemLocation() + configuration.getDtdFilename(),
CmsEncoder.ENCODING_UTF_8);
CmsXmlEntityResolver.cacheSystemId(
configuration.getDtdUrlPrefix() + configuration.getDtdFilename(),
file.getBytes(CmsEncoder.ENCODING_UTF_8));
if (LOG.isDebugEnabled()) {
LOG.debug(Messages.get().getBundle().key(
Messages.LOG_CACHE_DTD_SYSTEM_ID_1,
configuration.getDtdUrlPrefix()
+ configuration.getDtdFilename()
+ " --> "
+ configuration.getDtdSystemLocation()
+ configuration.getDtdFilename()));
}
} catch (IOException e) {
LOG.error(
Messages.get().getBundle().key(
Messages.LOG_CACHE_DTD_SYSTEM_ID_FAILURE_1,
configuration.getDtdSystemLocation() + configuration.getDtdFilename()),
e);
}
}
}
/**
* Loads the OpenCms configuration from the given XML URL.<p>
*
* @param url the base URL of the XML configuration to load
* @param configuration the configuration to load
* @throws SAXException in case of XML parse errors
* @throws IOException in case of file IO errors
*/
private void loadXmlConfiguration(URL url, I_CmsXmlConfiguration configuration) throws SAXException, IOException {
// generate the file URL for the XML input
URL fileUrl = new URL(url, configuration.getXmlFileName());
if (LOG.isDebugEnabled()) {
LOG.debug(Messages.get().getBundle().key(Messages.LOG_LOAD_CONFIG_XMLFILE_1, fileUrl));
}
// create a backup of the configuration
backupXmlConfiguration(configuration);
// instantiate Digester and enable XML validation
m_digester = new Digester();
m_digester.setUseContextClassLoader(true);
m_digester.setValidating(true);
m_digester.setEntityResolver(new CmsXmlEntityResolver(null));
m_digester.setRuleNamespaceURI(null);
m_digester.setErrorHandler(new CmsXmlErrorHandler(fileUrl.getFile()));
// add this class to the Digester
m_digester.push(configuration);
configuration.addXmlDigesterRules(m_digester);
// start the parsing process
m_digester.parse(fileUrl.openStream());
}
/**
* Removes all backups that are older then the given number of days.<p>
*
* @param daysToKeep the days to keep the backups for
*/
private void removeOldBackups(long daysToKeep) {
long maxAge = (System.currentTimeMillis() - (daysToKeep * 24 * 60 * 60 * 1000));
File[] files = m_backupFolder.listFiles();
for (int i = 0; i < files.length; i++) {
File file = files[i];
long lastMod = file.lastModified();
if ((lastMod < maxAge) & (!file.getAbsolutePath().endsWith(CmsConfigurationManager.POSTFIX_ORI))) {
file.delete();
if (LOG.isDebugEnabled()) {
LOG.debug(Messages.get().getBundle().key(Messages.LOG_REMOVE_CONFIG_FILE_1, file.getAbsolutePath()));
}
}
}
}
}