/*
*
* 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.airavata.security.configurations;
import org.apache.airavata.security.AbstractAuthenticator;
import org.apache.airavata.security.Authenticator;
import org.apache.airavata.security.UserStore;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
/**
* This class will read authenticators.xml and load all configurations related to authenticators.
*/
public class AuthenticatorConfigurationReader extends AbstractConfigurationReader {
private List<Authenticator> authenticatorList = new ArrayList<Authenticator>();
protected static Logger log = LoggerFactory.getLogger(AuthenticatorConfigurationReader.class);
protected static boolean authenticationEnabled = true;
public AuthenticatorConfigurationReader() {
}
public void init(InputStream inputStream) throws IOException, ParserConfigurationException, SAXException {
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(inputStream);
doc.getDocumentElement().normalize();
NodeList rootNodeList = doc.getElementsByTagName("authenticators");
if (rootNodeList == null || rootNodeList.getLength() == 0) {
throw new ParserConfigurationException("authenticators.xml should have authenticators root element.");
}
Node authenticatorsNode = rootNodeList.item(0);
NamedNodeMap rootAttributes = authenticatorsNode.getAttributes();
if (rootAttributes != null && rootAttributes.getNamedItem("enabled") != null) {
String enabledAttribute = rootAttributes.getNamedItem("enabled").getNodeValue();
if (enabledAttribute != null) {
if (enabledAttribute.equals("false")) {
authenticationEnabled = false;
}
}
}
NodeList authenticators = doc.getElementsByTagName("authenticator");
for (int i = 0; i < authenticators.getLength(); ++i) {
Node node = authenticators.item(i);
if (node.getNodeType() == Node.ELEMENT_NODE) {
NamedNodeMap namedNodeMap = node.getAttributes();
String name = namedNodeMap.getNamedItem("name").getNodeValue();
String className = namedNodeMap.getNamedItem("class").getNodeValue();
String enabled = namedNodeMap.getNamedItem("enabled").getNodeValue();
String priority = namedNodeMap.getNamedItem("priority").getNodeValue();
String userStoreClass = namedNodeMap.getNamedItem("userstore").getNodeValue();
if (className == null) {
reportError("class");
}
if (userStoreClass == null) {
reportError("userstore");
}
Authenticator authenticator = createAuthenticator(name, className, enabled, priority, userStoreClass);
NodeList configurationNodes = node.getChildNodes();
for (int j = 0; j < configurationNodes.getLength(); ++j) {
Node configurationNode = configurationNodes.item(j);
if (configurationNode.getNodeType() == Node.ELEMENT_NODE) {
if (configurationNode.getNodeName().equals("specificConfigurations")) {
authenticator.configure(configurationNode);
}
}
}
if (authenticator.isEnabled()) {
authenticatorList.add(authenticator);
}
Collections.sort(authenticatorList, new AuthenticatorComparator());
StringBuilder stringBuilder = new StringBuilder("Successfully initialized authenticator ");
stringBuilder.append(name).append(" with class ").append(className).append(" enabled? ")
.append(enabled).append(" priority = ").append(priority);
log.debug(stringBuilder.toString());
}
}
}
private void reportError(String element) throws ParserConfigurationException {
throw new ParserConfigurationException("Error in configuration. Missing mandatory element " + element);
}
protected Authenticator createAuthenticator(String name, String className, String enabled, String priority,
String userStoreClassName) {
log.debug("Loading authenticator class " + className + " and name " + name);
// Load a class and instantiate an object
Class authenticatorClass;
try {
authenticatorClass = Class.forName(className, true, Thread.currentThread().getContextClassLoader());
// authenticatorClass = Class.forName(className);
} catch (ClassNotFoundException e) {
log.error("Error loading authenticator class " + className);
throw new RuntimeException("Error loading authenticator class " + className, e);
}
try {
AbstractAuthenticator authenticatorInstance = (AbstractAuthenticator) authenticatorClass.newInstance();
authenticatorInstance.setAuthenticatorName(name);
if (enabled != null) {
authenticatorInstance.setEnabled(Boolean.parseBoolean(enabled));
}
if (priority != null) {
authenticatorInstance.setPriority(Integer.parseInt(priority));
}
UserStore userStore = createUserStore(userStoreClassName);
authenticatorInstance.setUserStore(userStore);
return authenticatorInstance;
} catch (InstantiationException e) {
String error = "Error instantiating authenticator class " + className + " object.";
log.error(error);
throw new RuntimeException(error, e);
} catch (IllegalAccessException e) {
String error = "Not allowed to instantiate authenticator class " + className;
log.error(error);
throw new RuntimeException(error, e);
}
}
protected UserStore createUserStore(String userStoreClassName) {
try {
Class userStoreClass = Class.forName(userStoreClassName, true, Thread.currentThread()
.getContextClassLoader());
return (UserStore) userStoreClass.newInstance();
} catch (ClassNotFoundException e) {
log.error("Error loading authenticator class " + userStoreClassName);
throw new RuntimeException("Error loading authenticator class " + userStoreClassName, e);
} catch (InstantiationException e) {
String error = "Error instantiating authenticator class " + userStoreClassName + " object.";
log.error(error);
throw new RuntimeException(error, e);
} catch (IllegalAccessException e) {
String error = "Not allowed to instantiate authenticator class " + userStoreClassName;
log.error(error);
throw new RuntimeException(error, e);
}
}
public List<Authenticator> getAuthenticatorList() {
return Collections.unmodifiableList(authenticatorList);
}
/**
* We can specify whether authentication is enabled in the system for all request or not. This we can state in the
* configuration. AuthenticatorConfigurationReader will read that information and will populate that to static
* boolean authenticationEnabled. This method will say whether authentication is enabled in the system or disabled
* in the system.
*
* @return <code>true</code> if authentication is enabled. Else <code>false</code>.
*/
public static boolean isAuthenticationEnabled() {
return authenticationEnabled;
}
/**
* Comparator to sort authenticators based on authenticator priority.
*/
public class AuthenticatorComparator implements Comparator<Authenticator> {
@Override
public int compare(Authenticator o1, Authenticator o2) {
return (o1.getPriority() > o2.getPriority() ? -1 : (o1.getPriority() == o2.getPriority() ? 0 : 1));
}
}
}