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node-red-nodes/parsers/geohash/70-geohash.js
2018-01-31 11:18:30 +00:00

86 lines
4.1 KiB
JavaScript

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