/
index.js
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/
index.js
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var express = require("express"),
bodyParser = require('body-parser'),
hbs = require("hbs"),
webPush = require('web-push'),
dotenv = require('dotenv'),
Twitter = require('twitter'),
EventEmitter = require('events').EventEmitter,
emitter = new EventEmitter(),
app = express(),
messageCount = 0,
endpoint, key;
dotenv.load();
webPush.setGCMAPIKey(process.env.GCM_ID);
var hashtag = process.env.HASHTAG;
var twitterClient = new Twitter({
consumer_key: process.env.TWITTER_CONSUMER_KEY,
consumer_secret: process.env.TWITTER_CONSUMER_SECRET,
access_token_key: process.env.TWITTER_ACCESS_TOKEN_KEY,
access_token_secret: process.env.TWITTER_ACCESS_TOKEN_SECRET
});
app.use(express.static("public"));
app.use(bodyParser.urlencoded({extended: true}));
// Set the templates to handlebars
app.set("views", __dirname + "/views");
app.set("view engine", "hbs");
app.get("/", function(req, res){
twitterClient.get('search/tweets', {q: hashtag}, function(error, tweets, response){
if(error){
res.render("error");
}else{
res.render("index", { messages: tweets.statuses, hashtag: hashtag });
}
});
});
app.get("/stream", function(req, res){
req.setTimeout(0);
var sendMessage = function(message){
messageCount++;
res.write('id: ' + messageCount + '\n');
res.write("data: " + JSON.stringify(message) + '\n\n');
}
emitter.on("message", sendMessage);
res.writeHead(200, {
'Content-Type': 'text/event-stream',
'Cache-Control': 'no-cache',
'Connection': 'keep-alive'
});
res.write('\n');
req.on('close', function(){
emitter.removeListener("message", sendMessage);
});
});
twitterClient.stream('statuses/filter', {track: hashtag}, function(stream){
stream.on('data', function(tweet) {
data = {
from: tweet.user.screen_name,
body: tweet.text
}
console.log(data);
emitter.emit("message", data);
if (typeof endpoint !== 'undefined') {
if (typeof key !== 'undefined') {
var push = webPush.sendNotification(endpoint, 120, key, JSON.stringify(data));
} else {
var push = webPush.sendNotification(endpoint, 120);
}
push.then(function(result) { console.log("Push successful", result)});
push.catch(function(err) { console.log("Push failed: ", err) } );
}
});
stream.on('error', function(error) {
console.log(error);
});
});
app.get("/sub", function(req, res){
console.log(req.query);
endpoint = req.query.endpoint;
key = req.query.key;
res.send();
});
app.get("/latest", function(req, res){
twitterClient.get('search/tweets', {q: hashtag, count: 1}, function(error, tweets, response){
if(!error){
var status = tweets.statuses[0];
var data = {
from: status.user.screen_name,
body: status.text
}
res.send(data);
}
});
});
var server = app.listen(process.env.PORT || 3000, function (){
var host = server.address().address;
var port = server.address().port;
console.log("Hashtag streamer is listening to %s at http://%s:%s", hashtag, host, port);
});