155 lines
8.3 KiB
JavaScript
155 lines
8.3 KiB
JavaScript
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module.exports = function(RED) {
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"use strict";
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function convertDegreesMinutesSecondsToDecimals(degrees, minutes, seconds) {
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var result;
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result = degrees + (minutes / 60) + (seconds / 3600);
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return result;
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}
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function ExifNode(n) {
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RED.nodes.createNode(this,n);
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this.mode = n.mode || "normal";
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if (this.mode === "worldmap") { this.property = "payload.content"; }
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else { this.property = n.property || "payload"; }
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var node = this;
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var ExifImage = require('exif').ExifImage;
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/***
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* Extracts GPS location information from Exif data. If enough information is
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* provided, convert the Exif data into a pair of single floating point number
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* latitude/longitude data pairs. Populates msg.location with these.
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* Assumes that the msg object will always have exifData available as msg.exif.
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* Assume that the GPS data saved into Exif provides a valid value
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*/
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function addMsgLocationDataFromExifGPSData(msg,val) {
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var gpsData = msg.exif.gps; // declaring variable purely to make checks more readable
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if (gpsData.GPSAltitude) {
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/* istanbul ignore else */
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if (!msg.location) { msg.location = {}; }
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msg.location.alt = gpsData.GPSAltitude;
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}
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if (gpsData.GPSLatitudeRef && gpsData.GPSLatitude && gpsData.GPSLongitudeRef && gpsData.GPSLongitude) { // location can be determined, OK
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// The data provided in Exif is in degrees, minutes, seconds, this is to be converted into a single floating point degree
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if (gpsData.GPSLatitude.length === 3) { // OK to convert latitude
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if (gpsData.GPSLongitude.length === 3) { // OK to convert longitude
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var latitude = convertDegreesMinutesSecondsToDecimals(gpsData.GPSLatitude[0], gpsData.GPSLatitude[1], gpsData.GPSLatitude[2]);
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latitude = Math.round(latitude * 100000)/100000; // 5dp is approx 1m resolution...
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// (N)orth means positive latitude, (S)outh means negative latitude
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if (gpsData.GPSLatitudeRef.toString() === 'S' || gpsData.GPSLatitudeRef.toString() === 's') {
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latitude = latitude * -1;
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}
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var longitude = convertDegreesMinutesSecondsToDecimals(gpsData.GPSLongitude[0], gpsData.GPSLongitude[1], gpsData.GPSLongitude[2]);
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longitude = Math.round(longitude * 100000)/100000; // 5dp is approx 1m resolution...
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// (E)ast means positive longitude, (W)est means negative longitude
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if (gpsData.GPSLongitudeRef.toString() === 'W' || gpsData.GPSLongitudeRef.toString() === 'w') {
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longitude = longitude * -1;
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}
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// Create location property if not exists
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if (!msg.location) { msg.location = {}; }
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msg.location.lat = latitude;
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msg.location.lon = longitude;
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}
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else {
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node.log("Invalid longitude data, no location information has been added to the message.");
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}
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}
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else {
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node.log("Invalid latitude data, no location information has been added to the message.");
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}
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}
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else {
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node.log("The location of this image cannot be determined safely so no location information has been added to the message.");
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}
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if (msg.location) {
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msg.location.arc = {
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ranges: [100,300,500],
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pan: gpsData.GPSImgDirection,
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fov: (2 * Math.atan(36 / (2 * msg.exif.exif.FocalLengthIn35mmFormat)) * 180 / Math.PI),
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color: '#aaaa00'
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}
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msg.location.icon = "fa-camera fa-lg";
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msg.location.iconColor = "orange";
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var na;
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var pop = "";
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if (val.hasOwnProperty("name")) { na = val.name; }
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else if (msg.hasOwnProperty("filename")) {
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na = msg.filename.split('/').pop();
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pop = "Timestamp: "+msg.exif.image.ModifyDate+"<br/>";
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}
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else { na = msg.exif.image.Make+"_"+msg.exif.image.ModifyDate; }
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msg.location.name = na;
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msg.location.layer = "Images";
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if (msg.exif.image.ImageDescription) {
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pop = "Caption: "+msg.exif.image.ImageDescription+"<br/>"+pop;
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}
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pop += '<img width="280" src="data:image/jpeg;base64,'+val.toString("base64")+'"/>'
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if (msg.location.lat && msg.location.lon) {
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pop += "<br/>Lat, Lon: "+msg.location.lat+", "+msg.location.lon;
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}
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msg.location.popup = pop;
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}
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}
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this.on("input", function(msg) {
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if (node.mode === "worldmap" && Buffer.isBuffer(msg.payload)) { node.property = "payload"; }
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else if (node.mode === "worldmap" && (msg.payload.action !== "file" || msg.payload.type.indexOf("image") === -1)) { return; } // in case worldmap-in not filtered.
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try {
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var value = RED.util.getMessageProperty(msg,node.property);
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if (value !== undefined) {
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if (typeof value === "string") { // it must be a base64 encoded inline image type
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if (value.indexOf('data:image') !== -1) {
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value = new Buffer.from(value.replace(/^data:image\/[a-z]+;base64,/, ""), 'base64');
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}
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}
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if (Buffer.isBuffer(value)) { // or a proper jpg buffer
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new ExifImage({ image:value }, function (error, exifData) {
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if (error) {
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if (node.mode !== "worldmap") {
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node.log(error.toString());
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}
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else {
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msg.location = {name:msg.payload.name, lat:msg.payload.lat, lon:msg.payload.lon, layer:"Images", icon:"fa-camera fa-lg", draggable:true};
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msg.location.popup = '<img width="280" src="data:image\/png;base64,'+msg.payload.content.toString('base64')+'"/><br/>';
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}
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}
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else {
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if (exifData) {
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msg.exif = exifData;
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if ((exifData.hasOwnProperty("gps")) && (Object.keys(exifData.gps).length !== 0)) {
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addMsgLocationDataFromExifGPSData(msg,value);
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}
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//else { node.log("The incoming image did not contain Exif GPS data."); }
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}
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else {
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node.warn("The incoming image did not contain any Exif data, nothing to do.");
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}
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}
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if (node.mode === "worldmap") {
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msg.payload = msg.location;
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delete msg.location;
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}
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node.send(msg);
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});
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}
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else {
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node.error("Invalid payload received, the Exif node cannot proceed, no messages sent.",msg);
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return;
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}
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}
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else {
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node.warn("No input received, the Exif node cannot proceed, no messages sent.",msg);
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return;
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}
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}
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catch (error) {
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node.error("An error occurred while extracting Exif information. Please check the log for details.",msg);
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node.log('Error: '+error.message);
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return;
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}
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});
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}
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RED.nodes.registerType("exif",ExifNode);
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}
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