/* * Copyright 2019 - 2020 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.ByteBufOutputStream; import io.netty.buffer.Unpooled; import io.netty.channel.Channel; import io.netty.handler.codec.http.DefaultFullHttpResponse; import io.netty.handler.codec.http.FullHttpRequest; import io.netty.handler.codec.http.FullHttpResponse; import io.netty.handler.codec.http.HttpHeaderNames; import io.netty.handler.codec.http.HttpResponseStatus; import io.netty.handler.codec.http.HttpVersion; import org.traccar.BaseHttpProtocolDecoder; import org.traccar.session.DeviceSession; import org.traccar.NetworkMessage; import org.traccar.Protocol; import org.traccar.helper.BitUtil; import org.traccar.helper.DataConverter; import org.traccar.helper.UnitsConverter; import org.traccar.model.Position; import org.w3c.dom.Document; import org.w3c.dom.Element; 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.transform.Transformer; import javax.xml.transform.TransformerException; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; 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.text.SimpleDateFormat; import java.util.Date; import java.util.LinkedList; import java.util.List; public class GlobalstarProtocolDecoder extends BaseHttpProtocolDecoder { private final DocumentBuilder documentBuilder; private final XPath xPath; private final 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); } } private void sendResponse(Channel channel, String messageId) throws TransformerException { Document document = documentBuilder.newDocument(); Element rootElement = document.createElement("stuResponseMsg"); rootElement.setAttribute("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance"); rootElement.setAttribute( "xsi:noNamespaceSchemaLocation", "http://cody.glpconnect.com/XSD/StuResponse_Rev1_0.xsd"); rootElement.setAttribute("deliveryTimeStamp", new SimpleDateFormat("dd/MM/yyyy hh:mm:ss z").format(new Date())); rootElement.setAttribute("messageID", "00000000000000000000000000000000"); rootElement.setAttribute("correlationID", messageId); document.appendChild(rootElement); Element state = document.createElement("state"); state.appendChild(document.createTextNode("pass")); rootElement.appendChild(state); Element stateMessage = document.createElement("stateMessage"); stateMessage.appendChild(document.createTextNode("Store OK")); rootElement.appendChild(stateMessage); Transformer transformer = TransformerFactory.newInstance().newTransformer(); ByteBuf content = Unpooled.buffer(); transformer.transform(new DOMSource(document), new StreamResult(new ByteBufOutputStream(content))); if (channel != null) { FullHttpResponse response = new DefaultFullHttpResponse( HttpVersion.HTTP_1_1, HttpResponseStatus.OK, content); response.headers() .add(HttpHeaderNames.CONTENT_LENGTH, content.readableBytes()) .add(HttpHeaderNames.CONTENT_TYPE, "text/xml"); channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress())); } } @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))); int flags = buf.readUnsignedByte(); position.set(Position.PREFIX_IN + 1, !BitUtil.check(flags, 1)); position.set(Position.PREFIX_IN + 2, !BitUtil.check(flags, 2)); position.set(Position.KEY_CHARGE, !BitUtil.check(flags, 3)); if (BitUtil.check(flags, 4)) { position.set(Position.KEY_ALARM, Position.ALARM_VIBRATION); } position.setCourse(BitUtil.from(flags, 5) * 45); double latitude = buf.readUnsignedMedium() * 90.0 / (1 << 23); position.setLatitude(latitude > 90 ? latitude - 180 : latitude); double longitude = buf.readUnsignedMedium() * 180.0 / (1 << 23); position.setLongitude(longitude > 180 ? longitude - 360 : longitude); int speed = buf.readUnsignedByte(); position.setSpeed(UnitsConverter.knotsFromKph(speed)); position.set("batteryReplace", BitUtil.check(buf.readUnsignedByte(), 7)); if (speed != 0xff) { positions.add(position); } } } sendResponse(channel, document.getFirstChild().getAttributes().getNamedItem("messageID").getNodeValue()); return !positions.isEmpty() ? positions : null; } }