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index.js
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index.js
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'use strict';
require('dotenv').config();
const express = require('express');
const bodyParser = require('body-parser');
const request = require('request');
const app = express();
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
const Nexmo = require('nexmo');
const nexmo = new Nexmo({
apiKey: process.env.NEXMO_API_KEY,
apiSecret: process.env.NEXMO_API_SECRET,
applicationId: process.env.NEXMO_APPLICATION_ID,
privateKey: process.env.NEXMO_APPLICATION_PRIVATE_KEY
});
app.post('/webhooks/inbound-message', (req, res) => {
// swap 'to' and 'from' to respond to the message
const from = req.body.to.id;
const to = req.body.from.id;
const content = req.body.message.content;
// User has sent location from FB Messenger mobile app
if (content.type === 'location') {
getPostboxLocations(content.location.lat, content.location.long).then((results) => {
processCSV(results).then((nearest) => {
sendMessage(from, to, generateMapLink(nearest));
}, (error) => {
sendMessage(from, to, error);
});
}, (error) => {
sendMessage(from, to, error);
});
// User has sent address which needs geocoding
} else if(content.type === 'text') {
geocodeAddress(content.text).then((address) => {
getPostboxLocations(address.latitude, address.longitude).then((results) => {
processCSV(results).then((nearest) => {
sendMessage(from, to, generateMapLink(nearest));
}, (error) => {
sendMessage(from, to, error);
});
}, (error) => {
sendMessage(from, to, error);
});
}, (error) => {
sendMessage(from, to, error);
});
}
res.status(200).end();
});
app.post('/webhooks/message-status', (req, res) => {
console.log(req.body);
res.status(200).end();
});
const generateMapLink = (nearest) => {
let msg = '';
const mapUrl = 'https://www.google.com/maps/search/?api=1';
// Check to see if lat/lng pair was generated
if (typeof nearest.latitude === 'undefined') {
msg = 'No location provided!';
} else {
msg = `Your nearest postcode is here: ${mapUrl}&query=${nearest.latitude},${nearest.longitude}`;
}
return msg;
};
const getPostboxLocations = (lat, lon) => {
return new Promise((resolve, reject) => {
const postboxUrl = 'http://dracos.co.uk/made/locating-postboxes/nearest/?format=csv';
request(`${postboxUrl}&lat=${lat}&lon=${lon}`, (error, response, body) => {
if (error) {
reject('Unable to locate postboxes!');
} else {
resolve(body);
}
});
});
};
const geocodeAddress = (addressToGeocode) => {
return new Promise((resolve, reject) => {
const geocodeUrl = 'https://eu1.locationiq.com/v1/search.php?countrycodes=gb&limit=1&format=json';
const queryAddress = encodeURI(addressToGeocode);
request(`${geocodeUrl}&key=${process.env.LOCATIONIQ_API_KEY}&q=${queryAddress}`, (error, response, body) => {
if (error) {
// Something went wrong in the call to the geocoding servie
reject(error);
} else {
const obj = JSON.parse(body);
// No results returned
if (obj.error) {
reject('Unable to find that address!');
// Retrieve map coordinates from the results
} else {
let lat = obj[0].lat;
let lon = obj[0].lon;
resolve({
latitude: lat,
longitude: lon
});
}
}
});
});
};
const processCSV = (csv) => {
return new Promise((resolve, reject) => {
if (csv.length == 0) {
reject('No results found!');
} else {
const content = csv.split('\n');
const firstRow = content[1].split(',');
const result = {
postcode: firstRow[0],
latitude: firstRow[1],
longitude: firstRow[2],
distance: firstRow[3],
last: firstRow[4],
first: firstRow[5]
};
resolve(result);
}
});
};
const sendMessage = (from, to, message) => {
nexmo.channel.send(
{ 'type': 'messenger', 'id': to },
{ 'type': 'messenger', 'id': from },
{
'content': {
'type': 'text',
'text': message
}
},
(err, data) => { console.log(`Message ID: ${data.message_uuid}`); }
);
};
app.listen(3000);