87 lines
4.2 KiB
JavaScript
87 lines
4.2 KiB
JavaScript
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module.exports = function(RED) {
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"use strict";
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var geohash = require('ngeohash');
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function GeohashNode(n) {
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RED.nodes.createNode(this,n);
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this.property = n.property||"payload";
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var node = this;
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var round = function(value, decimals) {
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return Number(Math.round(value+'e'+decimals)+'e-'+decimals);
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}
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this.on("input", function(msg) {
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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") {
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// try to decode it...
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var regexp = new RegExp('^[a-z0-9]{1,9}$'); // can only contain a-z or 0-9 and length 1-9
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if (regexp.test(value)) {
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var po = geohash.decode(value);
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value = { lat:round(po.latitude,5), lon:round(po.longitude,5) };
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value.error = { lat:round(po.error.latitude,5), lon:round(po.error.longitude,5) };
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RED.util.setMessageProperty(msg,node.property,value);
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node.send(msg);
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}
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else if (value.indexOf(",") !== -1) {
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// has a comma so assume it's lat,lon(,precision)
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var bits = value.split(",");
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if ((bits.length === 2) || (bits.length === 3)) {
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var li = 9;
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if (bits.length === 3) {
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li = parseInt(bits[2]);
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if (li < 1) { li = 1; }
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if (li > 9) { li = 9; }
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}
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var la = Number(bits[0]);
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if (la < -90) { la = -90; }
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if (la > 90) { la = 90; }
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var lo = Number(bits[1]);
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if (lo < -180) { lo = ((lo-180)%360)+180; }
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if (lo > 180) { lo = ((lo+180)%360)-180; }
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if (!isNaN(la) && !isNaN(lo)) {
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value = geohash.encode(la, lo, li);
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RED.util.setMessageProperty(msg,node.property,value);
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node.send(msg);
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}
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else {
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node.warn("Incorrect string format - should be lat,lon");
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}
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}
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else { node.warn("Unexpected string format - should be lat,lon"); }
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}
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else { node.warn("Unexpected string format - should either be lat,lon or geohash"); }
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}
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else if (typeof value === "object") {
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if (value.hasOwnProperty("geohash")) {
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var pos = geohash.decode(value.geohash);
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value.lat = round(pos.latitude,5);
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value.lon = round(pos.longitude,5);
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value.error = { lat:round(pos.error.latitude,5), lon:round(pos.error.longitude,5) };
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RED.util.setMessageProperty(msg,node.property,value);
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node.send(msg);
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}
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else {
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var lat = value.lat || value.latitude;
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var lon = value.lon || value.longitude;
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var len = parseInt(value.precision || 9);
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if (len < 1) { len = 1; }
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if (len > 9) { len = 9; }
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value.precision = len;
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if (typeof lat === 'number' && typeof lon === 'number') {
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value.geohash = geohash.encode(lat, lon, len);
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RED.util.setMessageProperty(msg,node.property,value);
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node.send(msg);
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}
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else { node.warn("lat or lon missing from msg."+node.property); }
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}
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}
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else { node.warn("This node only expects strings or objects."); }
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}
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});
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}
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RED.nodes.registerType("geohash",GeohashNode);
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}
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