odoo website recaptcha improvements

recaptcha.js

/* Copyright 2016-2017 LasLabs Inc.
 * License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 */

odoo.define('website_form_recaptcha.recaptcha', function (require) {
    "use strict";

    var ajax = require('web.ajax');
    var snippet_animation = require('website.content.snippets.animation');
    var form_builder_send = snippet_animation.registry.form_builder_send;

    snippet_animation.registry.form_builder_send = form_builder_send.extend({

        start: function () {
            var self = this;
            this._super();
            this.$captchas = self.$('.o_website_form_recaptcha');
            this.handle_captcha();
        },
        handle_captcha: function() {
            return ajax.post('/website/recaptcha/', {}).then(
                function (result) {
                    var data = JSON.parse(result);
                    self.$captchas.append(this._get_captcha_elem(data));
                    if (self.$captchas.length) {
                        $.getScript(self._get_captcha_script_url(data));
                    }
                }
            );
        },
        _get_captcha_elem: function (data) {
            return $('div', {
                'class': 'g-recaptcha',
                'data-sitekey': data.site_key
            });
        },
        _get_captcha_script_url: function (data) {
            # TODO: interpolate lang if present in session.user_context
            return 'https://www.google.com/recaptcha/api.js'
        }
    });
});