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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2008, Red Hat Middleware LLC, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This 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 software 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.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.picketlink.trust.jbossws.util;

import org.picketlink.common.ErrorCodes;
import org.picketlink.common.PicketLinkLogger;
import org.picketlink.common.PicketLinkLoggerFactory;
import org.picketlink.common.exceptions.ProcessingException;
import org.picketlink.common.util.DocumentUtil;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * Given a jboss-wsse.xml file, extract the roles
 *
 * @author [email protected]
 * @since Apr 11, 2011
 */
public class JBossWSSERoleExtractor {

    private static final PicketLinkLogger logger = PicketLinkLoggerFactory.getLogger();

    public static final String UNCHECKED = "unchecked";

    /**
     *  Given the jboss-wsse.xml inputstream, return the configured roles 
  Note that the  setting will yield
     * a role of unchecked. So special handling needs to be done by the caller. 
     *
     * @param is
     * @param portName optionally pass in a portName
     *
     * @return a {@link List} of role names
     */
    public static List getRoles(InputStream is, String portName, String operationName) throws ProcessingException {
        List roles = new ArrayList();
        try {
            Document doc = DocumentUtil.getDocument(is);
            NodeList nl = doc.getElementsByTagName("port");
            if (nl != null) {
                int len = nl.getLength();
                if (len > 0) {
                    Node portNode = getNamedNode(nl, portName);
                    if (portNode != null) {
                        roles.addAll(getRoles(portNode, operationName));
                        return roles;
                    }
                }
                return getDefaultRoles(doc.getDocumentElement());
            }
        } catch (ProcessingException e) {
            throw e;
        } catch (Exception e1) {
            throw new ProcessingException(e1);
        }
        return roles;
    }

    private static Node getNamedNode(NodeList nl, String portName) {
        int len = nl.getLength();
        for (int i = 0; i < len; i++) {
            Node n = nl.item(i);
            if (n.getNodeType() == Node.ELEMENT_NODE) {
                Node name = n.getAttributes().getNamedItem("name");
                if (portName.equals(name.getNodeValue())) {
                    return n;
                }
            }
        }
        return null;
    }

    private static List getRoles(Node node, String operationName) throws ProcessingException {
        List roles = new ArrayList();

        Element elem = (Element) node;
        // First check for operations
        NodeList ops = elem.getElementsByTagName("operation");
        if (ops.getLength() > 0) {
            Node opNode = getNamedNode(ops, operationName);
            if (opNode != null) {
                return getDefaultRoles((Element) opNode);
            }
            return roles;
        }
        NodeList nl = elem.getElementsByTagName("authorize");
        if (nl != null) {
            int len = nl.getLength();

            if (len > 1) {
                throw new ProcessingException(ErrorCodes.PROCESSING_EXCEPTION + "More than one authorize element");
            }
            Node authorize = nl.item(0);
            roles.addAll(getRolesFromAuthorize((Element) authorize));
        }
        return roles;
    }

    private static List getDefaultRoles(Element root) throws ProcessingException {
        List roles = new ArrayList();
        NodeList children = root.getChildNodes();
        if (children != null) {
            int len = children.getLength();
            // Go down tree and if you hit port, return
            for (int i = 0; i < len; i++) {
                Node n = children.item(i);
                if (n.getNodeType() == Node.ELEMENT_NODE) {
                    Element newNode = (Element) n;
                    if (newNode.getNodeName().equals("port")) {
                        return roles;
                    } else if (newNode.getNodeName().equals("authorize")) {
                        return getRolesFromAuthorize(newNode);
                    } else {
                        roles = getDefaultRoles(newNode);
                    }
                }
            }
        }

        return validate(roles);
    }

    private static List validate(List roles) throws ProcessingException {
        // Validate that we do not have unchecked and roles
        if (roles.contains(UNCHECKED) && roles.size() > 1) {
            throw logger.jbossWSUncheckedAndRolesCannotBeTogether();
        }
        return roles;
    }

    private static List getRolesFromAuthorize(Element authorize) throws ProcessingException {
        List roles = new ArrayList();
        NodeList children = authorize.getChildNodes();

        int len = children.getLength();
        for (int i = 0; i < len; i++) {
            Node child = children.item(i);
            if (child instanceof Element) {
                String nodeName = child.getNodeName();
                if ("unchecked".equals(nodeName)) {
                    roles.add(nodeName);
                } else if ("role".equals(nodeName)) {
                    roles.add(child.getChildNodes().item(0).getNodeValue());
                }
            }
        }
        return validate(roles);
    }
}