node.js script to compare Steam games owned between multiple users

compare.js

var request = require('request'),
        async = require('async'),
        libxmljs = require('libxmljs'),
        optimist = require('optimist')
                .string('_')
                .usage('Usage: $0 {username} [{username} [...]]'),
        argv = optimist.argv

module.exports = {}
module.exports.compareUserGames = compareUserGames = function(users, end) {
        // should use url.parse() at some point to validate urls.
        userGamesList = {}, sameGames = false

        async.forEachSeries(users, function(user, done) {
                 getUserGames(user, function(err, uid, userGames) {
                        if(err) done(err)
                        userGamesList[uid] = userGames
                        done(null)
                 })
        }, function(err) {
                if(err) throw new Error(err)
                for(u in userGamesList) {
                        if(sameGames === false) {
                                sameGames = userGamesList[u]
                        } else {
                                for(var g in sameGames) {
                                        if(sameGames.hasOwnProperty(g) && !userGamesList[u].hasOwnProperty(g))
                                                delete sameGames[g]
                                }
                        }
                }
                end(null, sameGames, userGamesList)
        })
}

module.exports.getUserGames = getUserGames = function(userURL, done) {
        request(userURL + 'games/?tab=recent&xml=1', function(err, resp, page) {
        //page = fs.readFileSync('katana.xml'), err = false
                if(err) {
                        throw new Error(err)
                } else if (resp.statusCode != 200) {
                        throw new Error('http response ' + resp.statusCode)
                } else {
                        var games = {}, userID = ''
                        xmlDoc = libxmljs.parseXml(page)
                        userID = xmlDoc.get('//steamID64').text()
                        xmlDoc
                                .find('//game')
                                .map(function(i) {
                                        var r = {}
                                        i.childNodes().forEach(function(n) {
                                                if(n.name() !== 'text')
                                                        r[n.name()] = n.text()
                                        })
                                        if(Object.keys(r).length !== 0)
                                                return r
                                })
                                .forEach(function(g) {
                                        if(g && g.appID !== undefined)
                                                games[g.appID] = g
                                })
                        done(null, userID, games)
                }
        })
}

module.exports.parseMatchedGames = parseMatchedGames = function(err, result, gameList) { for(var i in result) { console.log(result[i].name + ' <' + result[i].storeLink + '>') }; console.log('------------') }
module.exports.parseGames = parseGames = function(err, uid, gameList) { for(var i in gameList) { console.log(gameList[i].name + ' <' + gameList[i].storeLink + '>') } }

if(argv._.length > 1) {
        var users = argv._.map(function(user){
                if(!user.match(/^[0-9]{17,25}$/)) {
                        // assume not a steamID64, go with profile url
                        user = 'http://steamcommunity.com/id/' + user
                } else {
                        user = 'http://steamcommunity.com/profiles/' + user
                }
                return user + '/'
        })

        if(users.length >= 2) {
                compareUserGames(users, parseMatchedGames)
        } else {
                getUserGames(users.shift(), parseGames)
        }
} else {
        console.log(optimist.help())
}

package.json

{
        "name":"steam-compare",
        "private":true,
        "version":"0.0.1",
        "dependencies":{
                "request":"2.12.x",
                "async":"0.1.x",
                "libxmljs":"0.6.x",
                "optimist":"0.3.x"
        },
        "engine": "node >= 0.8.x"
}