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/*
* Copyright 2019 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.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
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.Protocol;
import org.traccar.helper.DataConverter;
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.Date;
import java.util.LinkedList;
import java.util.List;
public class GlobalstarProtocolDecoder extends BaseHttpProtocolDecoder {
private DocumentBuilder documentBuilder;
private XPath xPath;
private XPathExpression messageExpression;
public GlobalstarProtocolDecoder(Protocol protocol) {
super(protocol);
try {
DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
builderFactory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
builderFactory.setFeature("http://xml.org/sax/features/external-general-entities", false);
builderFactory.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
builderFactory.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
builderFactory.setXIncludeAware(false);
builderFactory.setExpandEntityReferences(false);
documentBuilder = builderFactory.newDocumentBuilder();
xPath = XPathFactory.newInstance().newXPath();
messageExpression = xPath.compile("//stuMessages/stuMessage");
} 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("esn", node));
if (deviceSession != null) {
Position position = new Position(getProtocolName());
position.setDeviceId(deviceSession.getDeviceId());
position.setValid(true);
position.setTime(new Date(Long.parseLong(xPath.evaluate("unixTime", node)) * 1000));
ByteBuf buf = Unpooled.wrappedBuffer(
DataConverter.parseHex(xPath.evaluate("payload", node).substring(2)));
buf.readUnsignedByte(); // flags
position.setLatitude(buf.readUnsignedMedium() * 90.0 / (1 << 23));
if (position.getLatitude() > 90) {
position.setLatitude(position.getLatitude() - 180);
}
position.setLongitude(buf.readUnsignedMedium() * 180.0 / (1 << 23));
if (position.getLongitude() > 180) {
position.setLongitude(position.getLongitude() - 360);
}
buf.readUnsignedByte(); // status
buf.readUnsignedByte(); // status
positions.add(position);
}
}
sendResponse(channel, HttpResponseStatus.OK);
return positions;
}
}
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