error handling node

subdomain.js

'use strict';

var util = require('util'),
    _ = require('lodash'),
    nvbUtil = require('../../lib/nvb-util'),
    session = require('../../lib/session'),
    config = require('../../config'),
    settingsManager = require('../../lib/settings');

/**
 * Check if given client may be handled by zipper service.
 * Checking is based on url subdomains {client}.{domain}
 *
 * @param {Request} req
 * @param {Response} res
 * @param {Function} next
 * @returns {*}
 */
module.exports.authenticationBySubdomain = function(req, res, next) {
    var RequestUtil = new nvbUtil.Request(req),
        subdomains = RequestUtil.extractSubdomains(config.app.domain);

    if (subdomains.length < 2) {
        var err = new Error(
            util.format(
                'middleware::authenticationBySubdomain requesting host does not contain proper ' +
                'subdomain pattern "{storage}.{client}.%s"',
                config.app.domain
            )
        );

        err.context = 'api';
        err.formatter = 'json';
        err.httpStatus = 500;

        return next(err);
    }

    var clientId = subdomains[subdomains.length - 1],
        provider = subdomains[subdomains.length - 2];

    settingsManager.getSetting('client', clientId, function(err, data) {
        if (err) {
            console.log(typeof err);
            var err = new Error(err.message);

            err.kernel = 'api';
            err.formatter = 'json';
            err.httpStatus = 404;

            next(err);
        }

        session.setClient(clientId);
        session.setProvider(provider);

        return next();
    });
};