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server.js
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server.js
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// server.js
// where your node app starts
// init project
var express = require('express');
var http = require('http');
var request = require('request');
var bodyParser = require('body-parser');
var app = express();
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
// we've started you off with Express,
// but feel free to use whatever libs or frameworks you'd like through `package.json`.
// http://expressjs.com/en/starter/static-files.html
app.use(express.static('public'));
// http://expressjs.com/en/starter/basic-routing.html
app.get("/", function (request, response) {
response.sendFile(__dirname + '/views/index.html');
});
/* For Facebook Validation */
app.get('/webhook', (req, res) => {
console.log(req.query);
if (req.query['hub.mode'] == "subscribe" && req.query['hub.verify_token'] == process.env.VERIFY_TOKEN) {
res.status(200).send(req.query['hub.challenge']);
} else {
res.status(403).end();
}
});
/* Handling all messenges */
app.post('/webhook', (req, res) => {
//console.log(req.body);
if (req.body.object === 'page') {
req.body.entry.forEach((entry) => {
entry.messaging.forEach((event) => {
if (event.message && event.message.text) {
sendMessage(event);
}
});
});
res.status(200).end();
}
});
// listen for requests :)
var listener = app.listen(process.env.PORT, function () {
console.log('Your app is listening on port ' + listener.address().port);
});
function sendMessage(event) {
let sender = event.sender.id;
let text = event.message.text;
make_wa_call(text, function(text){
request({
url: 'https://graph.facebook.com/v2.6/me/messages',
qs: {access_token: process.env.PAGE_ACCESS_TOKEN},
method: 'POST',
json: {
recipient: {id: sender},
message: {text: text}
}
}, function (error, response) {
if (error) {
console.log('Error sending message: ', error);
} else if (response.body.error) {
console.log('Error: ', response.body.error);
}
});
})
}
function make_wa_call(query, callback) {
var wa_url = "http://api.wolframalpha.com/v2/query?format=plaintext&output=JSON&includepodid=Result&appid="+process.env.WOLFRAM_APPID+"&input="+query;
console.log(wa_url);
http.get(wa_url, function(res) {
res.setEncoding('utf8');
res.on('data', function (chunk) {
//console.log('BODY: ' + chunk);
res=JSON.parse(chunk)
//console.log(res.queryresult.success);
//console.log(res.queryresult.didyoumeans.val);
if(res.queryresult.pods) {
var ret = res.queryresult.pods[0].subpods[0].plaintext;
//console.log(ret);
callback(ret);
} else {
callback("Sorry, couldn't find anything");
}
});
res.on('error', function (e) {
console.log('Error: ' + e);
callback("Error: "+e);
});
}).end();
}