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/*
* Copyright 2017 - 2018 Anton Tananaev (anton@traccar.org)
*
* Licensed 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.traccar.protocol;
import com.fasterxml.jackson.databind.util.ByteBufferBackedInputStream;
import io.netty.channel.Channel;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.HttpResponseStatus;
import org.traccar.BaseHttpProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.helper.DateUtil;
import org.traccar.model.Position;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import java.net.SocketAddress;
import java.util.LinkedList;
import java.util.List;
public class SpotProtocolDecoder extends BaseHttpProtocolDecoder {
private DocumentBuilder documentBuilder;
private XPath xPath;
private XPathExpression messageExpression;
public SpotProtocolDecoder(SpotProtocol protocol) {
super(protocol);
try {
documentBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
xPath = XPathFactory.newInstance().newXPath();
messageExpression = xPath.compile("//messageList/message");
} catch (ParserConfigurationException | XPathExpressionException e) {
throw new RuntimeException(e);
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
FullHttpRequest request = (FullHttpRequest) msg;
Document document = documentBuilder.parse(new ByteBufferBackedInputStream(request.content().nioBuffer()));
NodeList nodes = (NodeList) messageExpression.evaluate(document, XPathConstants.NODESET);
List<Position> positions = new LinkedList<>();
for (int i = 0; i < nodes.getLength(); i++) {
Node node = nodes.item(i);
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, xPath.evaluate("esnName", node));
if (deviceSession != null) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setValid(true);
position.setTime(DateUtil.parseDate(xPath.evaluate("timestamp", node)));
position.setLatitude(Double.parseDouble(xPath.evaluate("latitude", node)));
position.setLongitude(Double.parseDouble(xPath.evaluate("longitude", node)));
position.set(Position.KEY_EVENT, xPath.evaluate("messageType", node));
positions.add(position);
}
}
sendResponse(channel, HttpResponseStatus.OK);
return positions;
}
}
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