Recaptcha usage for TrinteJS framework

recaptcha.js

/**
 *  Recaptcha builder
 *  
 *
 *  Created by init script
 *  App based on TrinteJS MVC framework
 *  TrinteJS homepage http://www.trintejs.com
 **/
var Recaptcha = require('recaptcha').Recaptcha;
var config = require("../configuration");
var captchaConf = config.recaptcha;

function buildRecaptcha(data) {
    return new Recaptcha(captchaConf.public_key, captchaConf.private_key, data);
}

exports.createRecaptcha = function createRecaptcha() {
    return function(req, res, next) {
        res.locals({
            recaptcha: {
                form: buildRecaptcha().toHTML(),
                valid: false,
                error: false
            }
        });
        next();
    };
};

exports.verifyRecaptcha = function verifyRecaptcha(successTo) {
    return function(req, res, next) {
        buildRecaptcha({
            remoteip: req.connection.remoteAddress,
            challenge: req.body.recaptcha_challenge_field,
            response: req.body.recaptcha_response_field
        }).verify(function(success, error_code) {
            var locals = {
                recaptcha: {
                    form: buildRecaptcha().toHTML(),
                    error: false
                }
            };
            if (success) {
                locals.recaptcha.valid = true;
            } else {
                // Redisplay the form.
                locals.recaptcha.valid = false;
                locals.recaptcha.error = error_code;
            }

            res.locals(locals);

            if (successTo) {
                res.redirect(successTo);
            } else {
                next();
            }
        });
    };
};

exports.middleware = function middleware() {
    return function(req, res, next) {
        if (req.method === 'POST' || req.method === 'PUT') {
            buildRecaptcha({
                remoteip: req.connection.remoteAddress,
                challenge: req.body.recaptcha_challenge_field,
                response: req.body.recaptcha_response_field
            }).verify(function(success, error_code) {
                var locals = {
                    recaptcha: {
                        form: buildRecaptcha().toHTML(),
                        error: false
                    }
                };
                if (success) {
                    locals.recaptcha.valid = true;
                } else {
                    // Redisplay the form.
                    locals.recaptcha.valid = false;
                    locals.recaptcha.error = error_code;
                }

                res.locals(locals);
                next();
            });
        } else {
            res.locals({
                recaptcha: {
                    form: buildRecaptcha().toHTML(),
                    valid: false,
                    error: false
                }
            });
            next();
        }
    };
};