Adding Exif node.
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zobalogh
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<!--
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Copyright 2014 IBM Corp.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<script type="text/x-red" data-template-name="exif">
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<div class="form-row">
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<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
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<input type="text" id="node-input-name" placeholder="Name">
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</div>
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</script>
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<script type="text/x-red" data-help-name="exif">
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<p>Extract <a href="http://en.wikipedia.org/wiki/Exchangeable_image_file_format">Exif</a> information from JPEG images.</p>
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<p>This node expects an incoming JPEG image buffer. If Exif data is present,
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it extracts the data into the <b>msg.exif</b> object.</p>
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<p>The node then adds location data as <b>msg.location</b>, should the Exif data carry this information.
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<b>msg.payload</b> remains the original, unmodified image buffer. </p>
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</script>
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<script type="text/javascript">
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RED.nodes.registerType('exif',{
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category: 'utility',
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color:"#f1c2f0",
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defaults: {
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name: {value:""}
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},
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inputs:1,
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outputs:1,
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icon: "watch.png",
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label: function() {
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return this.name||"exif";
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},
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labelStyle: function() {
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return this.name?"node_label_italic":"";
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}
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});
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</script>
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/**
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* Copyright 2014 IBM Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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**/
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module.exports = function(RED) {
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"use strict";
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var ExifImage = require('exif').ExifImage;
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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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/***
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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) {
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if(msg.exif.gps) {
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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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if(!msg.location) {
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msg.location = {};
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}
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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;
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// (N)orth means positive latitude
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// (S)outh means negative latitude
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// (E)ast means positive longitude
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// (W)est means negative longitude
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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;
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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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if(!msg.location) {
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msg.location = {};
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}
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msg.location.lat = latitude;
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msg.location.lon = longitude;
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return;
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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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} 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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} 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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} else {
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node.log("No location info found in this image.");
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}
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}
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function ExifNode(n) {
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RED.nodes.createNode(this,n);
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var node = this;
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this.on("input", function(msg) {
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try {
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if(msg.payload) {
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var isBuffer = Buffer.isBuffer(msg.payload);
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if(isBuffer === true) {
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new ExifImage({ image : msg.payload }, function (error, exifData) {
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if (error) {
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node.error('Failed to extract Exif data from image.');
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node.log('Failed to extract Exif data from image. '+ error);
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} else {
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//msg.payload remains the same buffer
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if(exifData) {
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msg.exif = exifData;
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addMsgLocationDataFromExifGPSData(msg);
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} else {
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node.warn("The incoming buffer did not contain Exif data, nothing to do. ");
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}
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}
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node.send(msg);
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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.");
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return;
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}
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} else {
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node.error("No payload received, the Exif node cannot proceed, no messages sent.");
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return;
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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.");
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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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@ -0,0 +1,23 @@
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{
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"name" : "node-red-node-exif",
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"version" : "0.0.1",
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"description" : "A Node-RED node that extracts Exif information from JPEG image buffers.",
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"dependencies" : {
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"exif": "0.4.0"
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},
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"repository" : {
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"type":"git",
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"url":"https://github.com/node-red/node-red-nodes/tree/master/utility/exif"
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},
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"license": "Apache-v2.0",
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"keywords": [ "node-red", "exif"],
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"node-red" : {
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"nodes" : {
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"exif": "94-exif.js"
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}
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},
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"contributors": [
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{"name": "Dave Conway-Jones"},
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{"name": "Zoltan Balogh"}
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]
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}
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