Get Steam username from UID

steam.js

var http = require('http');

var steamUidRe = /<steamID64>(.*)<\/steamID64>/;

function getSteamUid(username, callback) {
    var callbackCalled = false;

    var req = http.request({
        host: 'steamcommunity.com',
        port: 80,
        path: '/id/' + encodeURI(username) + '?xml=1',
        method: 'GET'
    }, function (res) {
        var data = '';

        res.setEncoding('utf8');
        res.on('data', function (chunk) {
            if (callbackCalled) {
                return;
            }

            data += chunk;

            var match = steamUidRe.exec(data);
            if (match) {
                // TODO Close connection somehow

                callbackCalled = true;
                callback(null, match[1]);
            }
        });

        res.on('end', function () {
            if (!callbackCalled) {
                callback(new Error('Failed to load UID'));
            }
        });
    });

    req.on('error', function (err) {
        callback(err);
    });

    req.end();
}

var steamUsernameRe = /<steamID>\s*<!\[CDATA\[(.*?)\]\]>\s*<\/steamID>/;

function getSteamUsername(uid, callback) {
    var callbackCalled = false;

    var req = http.request({
        host: 'steamcommunity.com',
        port: 80,
        path: '/profiles/' + encodeURI(uid) + '?xml=1',
        method: 'GET'
    }, function (res) {
        var data = '';

        res.setEncoding('utf8');
        res.on('data', function (chunk) {
            if (callbackCalled) {
                return;
            }

            data += chunk;

            var match = steamUsernameRe.exec(data);
            if (match) {
                // TODO Close connection somehow

                callbackCalled = true;
                callback(null, match[1]);
            }
        });

        res.on('end', function () {
            if (!callbackCalled) {
                callback(new Error('Failed to load username'));
            }
        });
    });

    req.on('error', function (err) {
        callback(err);
    });

    req.end();
}

var steamUsernameHackRe = /\/([^\/]*)\/$/;

function getSteamUsernameHack(uid, callback) {
    var req = http.request({
        host: 'steamcommunity.com',
        port: 80,
        path: '/profiles/' + encodeURI(uid),
        method: 'HEAD'
    }, function (res) {
        if (!res.headers.location) {
        }

        var match = steamUsernameHackRe.exec(res.headers.location || '');
        if (match) {
            return callback(null, match[1]);
        } else {
            return callback(new Error('Hack failed'));
        }
    });

    req.on('error', function (err) {
        callback(err);
    });

    req.end();
}

function getSteamUsernameFast(uid, callback) {
    getSteamUsernameHack(uid, function (err, username) {
        if (err) {
            getSteamUsername(uid, callback);
        } else {
            callback(null, username);
        }
    });
}

if (require.main === module) {
    if (process.argv.length < 3) {
        console.log('Usage: node steam.js uid [uid ...]');
        process.exit(1);
        return;
    }

    process.argv.slice(2).forEach(function (uid) {
        getSteamUsernameFast(uid, function (err, username) {
            if (err) throw err;

            console.log(uid + ' ' + username);
        });
    });
}