index.js

/**
 * Created by raul on 11/20/16.
 */

// Require keystone and i18n-node
var keystone = require('keystone'),
	extend = require('util')._extend,
	i18n = require('i18n');

// extend twig
var twigAvailable = true;
try {
	require.resolve('twig');
} catch (e) {
	twigAvailable = false;
	console.log('twig module not found');
}
if (twigAvailable) {
	var twig = require('twig');
	twig.extendFunction("__", function(text, domain) {
		if (typeof domain == 'undefined') domain = '';
		return i18n.__(text, domain);
	});
}

// define module
var _this = {
	defaultOptions: {
		locales: ['en', 'es'],
    	endpoint: '/lang',
		defaultLocale: 'en',
		cookie: 'language'
	},
    init: function (options) {
		// Get options
		options = extend(_this.defaultOptions, options);
        // Configure i18n
        i18n.configure(options);
        i18n.setLocale(options.defaultLocale);
        // Add-in i18n support
        keystone.pre('routes', i18n.init);
        // Locale switch endpoint
        keystone.app.get('/' + options.endpoint.replace(/^\/|\/$/g, '') + '/:lang', _this.switchLocale);
    },
    switchLocale: function (req, res) {
        i18n.setLocale(req.params.lang);
        res.cookie('language', req.params.lang, { maxAge: 900000, httpOnly: true });
        res.redirect('back');
    }
};

// export
module.exports = _this;