Weather Bot for Slack

slackWeatherBot.js

// please leave this notice intact, otherwise do as you please :)
// by hello@franciskim.co
// get more info at http://franciskim.co/2015/07/22/how-to-create-a-weather-bot-for-slack-chat/

var express = require('express');
var app = express();
var http = require('http');
var Slackhook = require('slackhook');
var slack = new Slackhook({
    domain: 'yoursubdomain',
    token: 'abcdedfhijklmnopqrstuvwxyz'
});
var bodyParser = require('body-parser');

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({
    extended: true
}));

// set your channel here
var channel = '#general';

app.post('/weather', function(req, res) {

    // get search query from Slack message
    var search = req.body.text.replace(req.body.trigger_word, '').trim();
    
    // prepare Yahoo Weather API URL (get WOEID)
    var locationQuery = escape("select item from weather.forecast where woeid in (select woeid from geo.places where text='" + search + "') and u='c'"),
        locationUrl = "http://query.yahooapis.com/v1/public/yql?q=" + locationQuery + "&format=json";

    http.get(locationUrl, function(res) {
        res.setEncoding('binary');

        var data = "";
        res.on('data', function(chunk) {
            return data += chunk;
        });
        res.on('end', function() {
            result = JSON.parse(data);
            // parse the data and send to the channel
            // sometimes Yahoo returns an array and sometimes doesn't
            // depending on how many results are available for the search term
            // this code is hardcoded to send the first result if it's an array
            if (result.query.results.channel instanceof Array) {
                slack.send({
                    text: result.query.results.channel[0].item.title + '\n`Current` ' + result.query.results.channel[0].item.condition.temp + ' degrees, ' + result.query.results.channel[0].item.condition.text + '\n`' + result.query.results.channel[0].item.forecast[0].day + '` High: ' + result.query.results.channel[0].item.forecast[0].high + ' Low: ' + result.query.results.channel[0].item.forecast[0].low + ', ' + result.query.results.channel[0].item.forecast[0].text + '\n`' + result.query.results.channel[0].item.forecast[1].day + '` High: ' + result.query.results.channel[0].item.forecast[1].high + ' Low: ' + result.query.results.channel[0].item.forecast[1].low + ', ' + result.query.results.channel[0].item.forecast[1].text,
                    channel: channel
                });
            } else {
                console.log(result.query.results.channel);
                slack.send({
                    text: result.query.results.channel.item.title + '\n`Current` ' + result.query.results.channel.item.condition.temp + ' degrees, ' + result.query.results.channel.item.condition.text + '\n`' + result.query.results.channel.item.forecast[0].day + '` High: ' + result.query.results.channel.item.forecast[0].high + ' Low: ' + result.query.results.channel.item.forecast[0].low + ', ' + result.query.results.channel.item.forecast[0].text + '\n`' + result.query.results.channel.item.forecast[1].day + '` High: ' + result.query.results.channel.item.forecast[1].high + ' Low: ' + result.query.results.channel.item.forecast[1].low + ', ' + result.query.results.channel.item.forecast[1].text,
                    channel: channel
                });
            }
        });
    });
});

var server = app.listen(3000, function() {
    var host = server.address().address;
    var port = server.address().port;
    console.log('Weather x Slack app listening at http://%s:%s', host, port);
});