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/**
 * 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.
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package com.sun.org.apache.xml.internal.security;

import java.io.InputStream;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.ArrayList;
import java.util.List;

import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import com.sun.org.apache.xml.internal.security.algorithms.JCEMapper;
import com.sun.org.apache.xml.internal.security.algorithms.SignatureAlgorithm;
import com.sun.org.apache.xml.internal.security.c14n.Canonicalizer;
import com.sun.org.apache.xml.internal.security.exceptions.XMLSecurityException;
import com.sun.org.apache.xml.internal.security.keys.keyresolver.KeyResolver;
import com.sun.org.apache.xml.internal.security.transforms.Transform;
import com.sun.org.apache.xml.internal.security.utils.ElementProxy;
import com.sun.org.apache.xml.internal.security.utils.I18n;
import com.sun.org.apache.xml.internal.security.utils.XMLUtils;
import com.sun.org.apache.xml.internal.security.utils.resolver.ResourceResolver;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;


This class does the configuration of the library. This includes creating the mapping of Canonicalization and Transform algorithms. Initialization is done by calling init which should be done in any static block of the files of this library. We ensure that this call is only executed once. /**
 * This class does the configuration of the library. This includes creating
 * the mapping of Canonicalization and Transform algorithms. Initialization is
 * done by calling {@link Init#init} which should be done in any static block
 * of the files of this library. We ensure that this call is only executed once.
 */
public class Init {

    
The namespace for CONF file /** The namespace for CONF file **/
    public static final String CONF_NS = "http://www.xmlsecurity.org/NS/#configuration";

    
logging logging facility /** {@link org.apache.commons.logging} logging facility */
    private static java.util.logging.Logger log =
        java.util.logging.Logger.getLogger(Init.class.getName());

    
Field alreadyInitialized /** Field alreadyInitialized */
    private static boolean alreadyInitialized = false;

    
Method isInitialized
Returns:
true if the library is already initialized./**
     * Method isInitialized
     * @return true if the library is already initialized.
     */
    public static synchronized final boolean isInitialized() {
        return Init.alreadyInitialized;
    }

    
Method init
/**
     * Method init
     *
     */
    public static synchronized void init() {
        if (alreadyInitialized) {
            return;
        }

        InputStream is =
            AccessController.doPrivileged(
                new PrivilegedAction<InputStream>() {
                    public InputStream run() {
                        String cfile =
                            System.getProperty("com.sun.org.apache.xml.internal.security.resource.config");
                        if (cfile == null) {
                            return null;
                        }
                        return getClass().getResourceAsStream(cfile);
                    }
                });
        if (is == null) {
            dynamicInit();
        } else {
            fileInit(is);
        }

        alreadyInitialized = true;
    }

    
Dynamically initialise the library by registering the default algorithms/implementations
/**
     * Dynamically initialise the library by registering the default algorithms/implementations
     */
    private static void dynamicInit() {
        //
        // Load the Resource Bundle - the default is the English resource bundle.
        // To load another resource bundle, call I18n.init(...) before calling this
        // method.
        //
        I18n.init("en", "US");

        if (log.isLoggable(java.util.logging.Level.FINE)) {
            log.log(java.util.logging.Level.FINE, "Registering default algorithms");
        }
        try {
            AccessController.doPrivileged(new PrivilegedExceptionAction<Void>(){
                public Void run() throws XMLSecurityException {
                    //
                    // Bind the default prefixes
                    //
                    ElementProxy.registerDefaultPrefixes();

                    //
                    // Set the default Transforms
                    //
                    Transform.registerDefaultAlgorithms();

                    //
                    // Set the default signature algorithms
                    //
                    SignatureAlgorithm.registerDefaultAlgorithms();

                    //
                    // Set the default JCE algorithms
                    //
                    JCEMapper.registerDefaultAlgorithms();

                    //
                    // Set the default c14n algorithms
                    //
                    Canonicalizer.registerDefaultAlgorithms();

                    //
                    // Register the default resolvers
                    //
                    ResourceResolver.registerDefaultResolvers();

                    //
                    // Register the default key resolvers
                    //
                    KeyResolver.registerDefaultResolvers();

                    return null;
                }
           });
        } catch (PrivilegedActionException ex) {
            XMLSecurityException xse = (XMLSecurityException)ex.getException();
            log.log(java.util.logging.Level.SEVERE, xse.getMessage(), xse);
            xse.printStackTrace();
        }
    }

    
Initialise the library from a configuration file
/**
     * Initialise the library from a configuration file
     */
    private static void fileInit(InputStream is) {
        try {
            /* read library configuration file */
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            dbf.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, Boolean.TRUE);

            dbf.setNamespaceAware(true);
            dbf.setValidating(false);

            DocumentBuilder db = dbf.newDocumentBuilder();
            Document doc = db.parse(is);
            Node config = doc.getFirstChild();
            for (; config != null; config = config.getNextSibling()) {
                if ("Configuration".equals(config.getLocalName())) {
                    break;
                }
            }
            if (config == null) {
                log.log(java.util.logging.Level.SEVERE, "Error in reading configuration file - Configuration element not found");
                return;
            }
            for (Node el = config.getFirstChild(); el != null; el = el.getNextSibling()) {
                if (Node.ELEMENT_NODE != el.getNodeType()) {
                    continue;
                }
                String tag = el.getLocalName();
                if (tag.equals("ResourceBundles")) {
                    Element resource = (Element)el;
                    /* configure internationalization */
                    Attr langAttr = resource.getAttributeNode("defaultLanguageCode");
                    Attr countryAttr = resource.getAttributeNode("defaultCountryCode");
                    String languageCode =
                        (langAttr == null) ? null : langAttr.getNodeValue();
                    String countryCode =
                        (countryAttr == null) ? null : countryAttr.getNodeValue();
                    I18n.init(languageCode, countryCode);
                }

                if (tag.equals("CanonicalizationMethods")) {
                    Element[] list =
                        XMLUtils.selectNodes(el.getFirstChild(), CONF_NS, "CanonicalizationMethod");

                    for (int i = 0; i < list.length; i++) {
                        String uri = list[i].getAttributeNS(null, "URI");
                        String javaClass =
                            list[i].getAttributeNS(null, "JAVACLASS");
                        try {
                            Canonicalizer.register(uri, javaClass);
                            if (log.isLoggable(java.util.logging.Level.FINE)) {
                                log.log(java.util.logging.Level.FINE, "Canonicalizer.register(" + uri + ", " + javaClass + ")");
                            }
                        } catch (ClassNotFoundException e) {
                            Object exArgs[] = { uri, javaClass };
                            log.log(java.util.logging.Level.SEVERE, I18n.translate("algorithm.classDoesNotExist", exArgs));
                        }
                    }
                }

                if (tag.equals("TransformAlgorithms")) {
                    Element[] tranElem =
                        XMLUtils.selectNodes(el.getFirstChild(), CONF_NS, "TransformAlgorithm");

                    for (int i = 0; i < tranElem.length; i++) {
                        String uri = tranElem[i].getAttributeNS(null, "URI");
                        String javaClass =
                            tranElem[i].getAttributeNS(null, "JAVACLASS");
                        try {
                            Transform.register(uri, javaClass);
                            if (log.isLoggable(java.util.logging.Level.FINE)) {
                                log.log(java.util.logging.Level.FINE, "Transform.register(" + uri + ", " + javaClass + ")");
                            }
                        } catch (ClassNotFoundException e) {
                            Object exArgs[] = { uri, javaClass };

                            log.log(java.util.logging.Level.SEVERE, I18n.translate("algorithm.classDoesNotExist", exArgs));
                        } catch (NoClassDefFoundError ex) {
                            log.log(java.util.logging.Level.WARNING, "Not able to found dependencies for algorithm, I'll keep working.");
                        }
                    }
                }

                if ("JCEAlgorithmMappings".equals(tag)) {
                    Node algorithmsNode = ((Element)el).getElementsByTagName("Algorithms").item(0);
                    if (algorithmsNode != null) {
                        Element[] algorithms =
                            XMLUtils.selectNodes(algorithmsNode.getFirstChild(), CONF_NS, "Algorithm");
                        for (int i = 0; i < algorithms.length; i++) {
                            Element element = algorithms[i];
                            String id = element.getAttribute("URI");
                            JCEMapper.register(id, new JCEMapper.Algorithm(element));
                        }
                    }
                }

                if (tag.equals("SignatureAlgorithms")) {
                    Element[] sigElems =
                        XMLUtils.selectNodes(el.getFirstChild(), CONF_NS, "SignatureAlgorithm");

                    for (int i = 0; i < sigElems.length; i++) {
                        String uri = sigElems[i].getAttributeNS(null, "URI");
                        String javaClass =
                            sigElems[i].getAttributeNS(null, "JAVACLASS");

                        /** $todo$ handle registering */

                        try {
                            SignatureAlgorithm.register(uri, javaClass);
                            if (log.isLoggable(java.util.logging.Level.FINE)) {
                                log.log(java.util.logging.Level.FINE, "SignatureAlgorithm.register(" + uri + ", "
                                          + javaClass + ")");
                            }
                        } catch (ClassNotFoundException e) {
                            Object exArgs[] = { uri, javaClass };

                            log.log(java.util.logging.Level.SEVERE, I18n.translate("algorithm.classDoesNotExist", exArgs));
                        }
                    }
                }

                if (tag.equals("ResourceResolvers")) {
                    Element[]resolverElem =
                        XMLUtils.selectNodes(el.getFirstChild(), CONF_NS, "Resolver");

                    for (int i = 0; i < resolverElem.length; i++) {
                        String javaClass =
                            resolverElem[i].getAttributeNS(null, "JAVACLASS");
                        String description =
                            resolverElem[i].getAttributeNS(null, "DESCRIPTION");

                        if ((description != null) && (description.length() > 0)) {
                            if (log.isLoggable(java.util.logging.Level.FINE)) {
                                log.log(java.util.logging.Level.FINE, "Register Resolver: " + javaClass + ": "
                                          + description);
                            }
                        } else {
                            if (log.isLoggable(java.util.logging.Level.FINE)) {
                                log.log(java.util.logging.Level.FINE, "Register Resolver: " + javaClass
                                          + ": For unknown purposes");
                            }
                        }
                        try {
                            ResourceResolver.register(javaClass);
                        } catch (Throwable e) {
                            log.log(java.util.logging.Level.WARNING,
                                 "Cannot register:" + javaClass
                                 + " perhaps some needed jars are not installed",
                                 e
                             );
                        }
                    }
                }

                if (tag.equals("KeyResolver")){
                    Element[] resolverElem =
                        XMLUtils.selectNodes(el.getFirstChild(), CONF_NS, "Resolver");
                    List<String> classNames = new ArrayList<String>(resolverElem.length);
                    for (int i = 0; i < resolverElem.length; i++) {
                        String javaClass =
                            resolverElem[i].getAttributeNS(null, "JAVACLASS");
                        String description =
                            resolverElem[i].getAttributeNS(null, "DESCRIPTION");

                        if ((description != null) && (description.length() > 0)) {
                            if (log.isLoggable(java.util.logging.Level.FINE)) {
                                log.log(java.util.logging.Level.FINE, "Register Resolver: " + javaClass + ": "
                                          + description);
                            }
                        } else {
                            if (log.isLoggable(java.util.logging.Level.FINE)) {
                                log.log(java.util.logging.Level.FINE, "Register Resolver: " + javaClass
                                          + ": For unknown purposes");
                            }
                        }
                        classNames.add(javaClass);
                    }
                    KeyResolver.registerClassNames(classNames);
                }


                if (tag.equals("PrefixMappings")){
                    if (log.isLoggable(java.util.logging.Level.FINE)) {
                        log.log(java.util.logging.Level.FINE, "Now I try to bind prefixes:");
                    }

                    Element[] nl =
                        XMLUtils.selectNodes(el.getFirstChild(), CONF_NS, "PrefixMapping");

                    for (int i = 0; i < nl.length; i++) {
                        String namespace = nl[i].getAttributeNS(null, "namespace");
                        String prefix = nl[i].getAttributeNS(null, "prefix");
                        if (log.isLoggable(java.util.logging.Level.FINE)) {
                            log.log(java.util.logging.Level.FINE, "Now I try to bind " + prefix + " to " + namespace);
                        }
                        ElementProxy.setDefaultPrefix(namespace, prefix);
                    }
                }
            }
        } catch (Exception e) {
            log.log(java.util.logging.Level.SEVERE, "Bad: ", e);
            e.printStackTrace();
        }
    }

}