node-red-contrib-snap4city-user
Version:
Nodes for Snap4city project, targeted to standard user (no developer)
105 lines (94 loc) • 5.96 kB
JavaScript
/* NODE-RED-CONTRIB-SNAP4CITY-USER
Copyright (C) 2018 DISIT Lab http://www.disit.org - University of Florence
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
module.exports = function (RED) {
function HeatmapPicker(config) {
RED.nodes.createNode(this, config);
var node = this;
var s4cUtility = require("./snap4city-utility.js");
const logger = s4cUtility.getLogger(RED, node);
node.on('input', function (msg) {
var metadataUrl = "https://heatmap.snap4city.org/heatmap-metadata.php";
var interpolationUrl = "https://heatmap.snap4city.org/interp.php";
var heatmapname = (msg.payload.heatmapname ? msg.payload.heatmapname : config.heatmapname);
var datetime = (msg.payload.datetime ? msg.payload.datetime : config.datetime);
var latitude = parseFloat(msg.payload.latitude ? msg.payload.latitude : config.latitude);
var longitude = parseFloat(msg.payload.longitude ? msg.payload.longitude : config.longitude);
const uid = s4cUtility.retrieveAppID(RED);
var inPayload = msg.payload;
var XMLHttpRequest = require("xmlhttprequest").XMLHttpRequest;
var xmlHttp = new XMLHttpRequest();
var xmlHttp2 = new XMLHttpRequest();
logger.info(encodeURI(metadataUrl + "/?dataset=" + heatmapname + "&latitude_min=" + (latitude - 0.15) + "&latitude_max=" + (latitude + 0.15) + "&longitude_min=" + (longitude - 0.15) + "&longitude_max=" + (longitude + 0.15)));
xmlHttp.open("GET", encodeURI(metadataUrl + "/?dataset=" + heatmapname + "&latitude_min=" + (latitude - 0.15) + "&latitude_max=" + (latitude + 0.15) + "&longitude_min=" + (longitude - 0.15) + "&longitude_max=" + (longitude + 0.15)), true); // false for synchronous request
xmlHttp.onload = function (e) {
if (xmlHttp.readyState === 4) {
if (xmlHttp.status === 200) {
logger.info("ResponseText: " + xmlHttp.responseText);
if (xmlHttp.responseText != "") {
try {
heatmapMetadata = JSON.parse(xmlHttp.responseText);
if (datetime) {
datetime = new Date(datetime).getTime();
} else {
datetime = new Date().getTime();
}
var minDistanceIndex = 0;
var currentDistance = 1000000000;
if (heatmapMetadata) {
for (var i = 0; i < heatmapMetadata.length; i++) {
if (Math.abs(new Date(heatmapMetadata[i].metadata.date).getTime() - datetime) < currentDistance) {
minDistanceIndex = i;
currentDistance = Math.abs(new Date(heatmapMetadata[i].metadata.date).getTime() - datetime);
}
}
}
} catch (e) {
heatmapMetadata = "";
}
if (heatmapMetadata != "") {
xmlHttp2.open("GET", encodeURI(interpolationUrl + "?dataset=" + heatmapMetadata[minDistanceIndex].metadata.mapName + "&latitude=" + latitude + "&longitude=" + longitude + "&date=" + heatmapMetadata[minDistanceIndex].metadata.date.replace(" ", "T") + ".000Z"), true); // false for synchronous request
xmlHttp2.onload = function (e) {
if (xmlHttp2.readyState === 4) {
if (xmlHttp2.status === 200) {
try {
msg.payload = JSON.parse(xmlHttp2.responseText);
} catch (e) {
msg.payload = JSON.parse("{\"status\": \"error\"}");;
}
} else {
msg.payload = xmlHttp2.statusText;
}
node.send(msg);
}
};
xmlHttp2.onerror = function (e) {
console.error(xmlHttp2.statusText);
node.error(xmlHttp2.responseText);
};
xmlHttp2.send(null);
}
}
}
} else {
logger.error(xmlHttp.statusText);
}
}
xmlHttp.onerror = function (e) {
logger.error(xmlHttp.statusText);
node.error(xmlHttp.responseText);
};
xmlHttp.send(null);
});
}
RED.nodes.registerType("heatmap-picker", HeatmapPicker);
}