/*
 * 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.ranger.common;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

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

import org.apache.log4j.Logger;
import org.springframework.util.DefaultPropertiesPersister;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class XMLPropertiesUtil extends DefaultPropertiesPersister {
	private static final Logger logger = Logger.getLogger(XMLPropertiesUtil.class);

	public XMLPropertiesUtil() {
	}

	@Override
	public void loadFromXml(Properties properties, InputStream inputStream)
			throws IOException {
		try {
			DocumentBuilderFactory xmlDocumentBuilderFactory = DocumentBuilderFactory
					.newInstance();
			xmlDocumentBuilderFactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
			xmlDocumentBuilderFactory.setFeature("http://xml.org/sax/features/external-general-entities", false);
                        xmlDocumentBuilderFactory.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
			xmlDocumentBuilderFactory.setIgnoringComments(true);
			xmlDocumentBuilderFactory.setNamespaceAware(true);
			DocumentBuilder xmlDocumentBuilder = xmlDocumentBuilderFactory
					.newDocumentBuilder();
			Document xmlDocument = xmlDocumentBuilder.parse(inputStream);
			xmlDocument.getDocumentElement().normalize();

			NodeList nList = xmlDocument.getElementsByTagName("property");

			for (int temp = 0; temp < nList.getLength(); temp++) {

				Node nNode = nList.item(temp);

				if (nNode.getNodeType() == Node.ELEMENT_NODE) {

					Element eElement = (Element) nNode;

					String propertyName = "";
					String propertyValue = "";
					if (eElement.getElementsByTagName("name").item(0) != null) {
						propertyName = eElement.getElementsByTagName("name")
								.item(0).getTextContent().trim();
					}
					if (eElement.getElementsByTagName("value").item(0) != null) {
						propertyValue = eElement.getElementsByTagName("value")
								.item(0).getTextContent().trim();
					}

					properties.put(propertyName, propertyValue);

				}
				//logger.info("ranger site properties loaded successfully.");
			}
		} catch (Exception e) {
			logger.error("Error loading : ", e);
		}
	}

}