/*
* Copyright (c) 2005-2010, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. 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.wso2.carbon.identity.core.util;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.impl.builder.StAXOMBuilder;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.osgi.framework.BundleContext;
import org.wso2.carbon.base.ServerConfigurationException;
import org.wso2.carbon.identity.core.internal.IdentityCoreServiceComponent;
import org.wso2.carbon.utils.ServerConstants;
import org.wso2.carbon.utils.CarbonUtils;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Stack;
import javax.xml.stream.XMLStreamException;
public class IdentityConfigParser {
public static final String OPENID_REALM = "OpenIDRealm";
public static final String REQUEST_CLAIMS_FROM_IDP = "RequestClaimsFromIdP";
private static final String IDENTITY_CONFIG = "identity.xml";
private static Map<String, Object> configuration = new HashMap<String, Object>();
private static IdentityConfigParser parser;
// To enable attempted thread-safety using double-check locking
private static Object lock = new Object();
private static Log log = LogFactory.getLog(IdentityConfigParser.class);
private static String configFilePath;
private IdentityConfigParser() throws ServerConfigurationException {
Stack<String> nameStack = new Stack<String>();
try {
readChildElements(getRootElement(), nameStack);
} catch (Exception e) {
log.error("Error while loading Identity Configurations", e);
throw new ServerConfigurationException("Error while loading Identity Configurations", e);
}
}
public static IdentityConfigParser getInstance() throws ServerConfigurationException {
if (parser == null) {
synchronized (lock) {
if (parser == null) {
parser = new IdentityConfigParser();
}
}
}
return parser;
}
public static IdentityConfigParser getInstance(String filePath)
throws ServerConfigurationException {
configFilePath = filePath;
return getInstance();
}
public Map<String, Object> getConfiguration() {
return configuration;
}
/**
*
* @return
* @throws XMLStreamException
* @throws IOException
*/
private OMElement getRootElement() throws XMLStreamException, IOException {
InputStream inStream = null;
StAXOMBuilder builder = null;
String warningMessage = "";
if (configFilePath != null) {
File identityConfigXml = new File(configFilePath);
if (identityConfigXml.exists()) {
inStream = new FileInputStream(identityConfigXml);
}
} else {
File identityConfigXml = new File(CarbonUtils.getCarbonConfigDirPath(), IDENTITY_CONFIG);
if (identityConfigXml.exists()) {
inStream = new FileInputStream(identityConfigXml);
}
if (inStream == null) {
URL url;
BundleContext bundleContext = IdentityCoreServiceComponent.getBundleContext();
if (bundleContext != null) {
if ((url = bundleContext.getBundle().getResource(IDENTITY_CONFIG)) != null) {
inStream = url.openStream();
} else {
warningMessage = "Bundle context could not find resource " + IDENTITY_CONFIG +
" or user does not have sufficient permission to access the resource.";
}
} else {
if ((url = this.getClass().getClassLoader().getResource(IDENTITY_CONFIG)) != null) {
inStream = url.openStream();
} else {
warningMessage = "Identity core could not find resource " + IDENTITY_CONFIG +
" or user does not have sufficient permission to access the resource.";
}
}
}
}
if (inStream == null) {
String message = "Identity configuration not found. Cause - " + warningMessage;
if (log.isDebugEnabled()) {
log.debug(message);
}
throw new FileNotFoundException(message);
}
builder = new StAXOMBuilder(inStream);
OMElement rootElement = builder.getDocumentElement();
if (inStream != null) {
inStream.close();
}
return rootElement;
}
private void readChildElements(OMElement serverConfig, Stack<String> nameStack) {
for (Iterator childElements = serverConfig.getChildElements(); childElements.hasNext();) {
OMElement element = (OMElement) childElements.next();
nameStack.push(element.getLocalName());
if (elementHasText(element)) {
String key = getKey(nameStack);
Object currentObject = configuration.get(key);
String value = replaceSystemProperty(element.getText());
if (currentObject == null) {
configuration.put(key, value);
} else if (currentObject instanceof ArrayList) {
ArrayList list = (ArrayList) currentObject;
if (!list.contains(value)) {
list.add(value);
}
} else {
if (!value.equals(currentObject)) {
ArrayList arrayList = new ArrayList(2);
arrayList.add(currentObject);
arrayList.add(value);
configuration.put(key, arrayList);
}
}
}
readChildElements(element, nameStack);
nameStack.pop();
}
}
private String getKey(Stack<String> nameStack) {
StringBuffer key = new StringBuffer();
for (int i = 0; i < nameStack.size(); i++) {
String name = nameStack.elementAt(i);
key.append(name).append(".");
}
key.deleteCharAt(key.lastIndexOf("."));
return key.toString();
}
private boolean elementHasText(OMElement element) {
String text = element.getText();
return text != null && text.trim().length() != 0;
}
private String replaceSystemProperty(String text) {
int indexOfStartingChars = -1;
int indexOfClosingBrace;
// The following condition deals with properties.
// Properties are specified as ${system.property},
// and are assumed to be System properties
while (indexOfStartingChars < text.indexOf("${")
&& (indexOfStartingChars = text.indexOf("${")) != -1
&& (indexOfClosingBrace = text.indexOf("}")) != -1) { // Is a property used?
String sysProp = text.substring(indexOfStartingChars + 2, indexOfClosingBrace);
String propValue = System.getProperty(sysProp);
if (propValue != null) {
text = text.substring(0, indexOfStartingChars) + propValue
+ text.substring(indexOfClosingBrace + 1);
}
if (sysProp.equals(ServerConstants.CARBON_HOME)) {
if (System.getProperty(ServerConstants.CARBON_HOME).equals(".")) {
text = new File(".").getAbsolutePath() + File.separator + text;
}
}
}
return text;
}
}