Automatically unzip compressed subtitles

betasub.js

var exec = require('child_process').exec;
var http = require("http");
var fs = require('fs');

var APIKEY = 'c8c4da831d5c';

function showScrape(filename, callback) {
    var url = "http://api.betaseries.com/shows/scraper.json?key=" + APIKEY + "&file=";
    url = url + encodeURIComponent(filename);
    http.get(url, function(res) {
        var data = '';
        res.on('data', function (chunk) {
            data += chunk;
        });
        res.on('end', function(){
            callback(JSON.parse(data).root);
        });
    }).on('error', function(e) {
        console.log("Got error: " + e.message);
    });
}

function subtitlesShow(params) {
    var url = "http://api.betaseries.com/subtitles/show/{{SLUG}}.json?key=" + APIKEY + "&language=VO&season={{SEASON}}&episode={{EPISODE}}";

    if (typeof params.episode.url === 'undefined') {
        console.log('Cannot find subtitles');
        return;
    }

    url = url.replace('{{SLUG}}', params.episode.url);
    url = url.replace('{{SEASON}}', params.episode.season);
    url = url.replace('{{EPISODE}}', params.episode.episode);

    http.get(url, function(res) {
        var data = '';
        res.on('data', function (chunk) {
            data += chunk;
        });
        res.on('end', function(){
            data = JSON.parse(data);
            if (data && data.root && data.root.subtitles && data.root.subtitles[0]) {
                subtitleDownload(data.root.subtitles[0].file, data.root.subtitles[0].url);
            } else {
                console.log("Cannot find subtitles");
            }
        });
    }).on('error', function(e) {
        console.log("Got error: " + e.message);
    });
}

function subtitleDownload(filename, url) {
    console.log(url, '->', filename);
    if (url.match(/^https/)) {
        //Force HTTP
        url = url.replace(/^https/,'http');
    }
    var file = fs.createWriteStream(filename);
    var request = http.get(url, function(response) {
        response.pipe(file);
        response.on('end', function(){
            if (filename.match('.zip')) {
                exec(
                    'unzip "' + filename + '"',
                    function (error, stdout, stderr) {
                        if (error === null) {
                            fs.unlink(filename);
                        }
                    }
                );
            }
        });
    });
}

if (process.argv.length === 3) {
    showScrape(process.argv[2], function(episode){
        subtitlesShow({
            episode: episode
        });
    });
} else {
    console.log("Usage:");
    console.log([
        process.argv[0],
        process.argv[1],
        "<filename>"
    ].join(" "));
}