multihost/lib/index.js

Hosting multiple Express apps on the same server.

'use strict';

/* eslint consistent-return: 0 */
module.exports = function multihost(options) {
    var hosts = options.hosts;
    var route = options.route;
    var server = options.server;

    if (route && typeof route !== 'string') {
        throw new Error('multihost: route is not a string');
    }
    if (!server) {
        throw new Error('multihost: server required');
    }
    // hosts
    var reHosts = [];
    if (hosts) {
        var list = [].concat(hosts);
        for (var i = 0; i < list.length; ++i) {
            reHosts.push(new RegExp('^' + list[i].replace(/[*]/g, '(.*?)') + '$', 'i'));
        }
    }
    return function (req, res, next) {
        // hosts
        if (reHosts.length > 0) {
            if (!req.headers.host) {
                return next();
            }
            var hostname = req.headers.host.split(':')[0]; // e.g. localhost:8000

            var _i = 0;
            for (_i = 0; _i < reHosts.length; ++_i) {
                if (reHosts[_i].test(hostname)) {
                    break;
                }
            }
            if (_i === reHosts.length) {
                return next();
            }
        }
        // route
        if (route && req.url.indexOf(route) !== 0) {
            return next();
        }
        // server
        if (typeof server === 'function') {
            return server(req, res, next);
        }

        server.emit('request', req, res);
    };
};