/*
   Copyright (c)  2014 IOnU Security Inc. All rights reserved
   Created April 2014 by Kendrick Webster
 
   K2Proxy/router.js - calls appropriate request handler based on path,
   or shows 404 response for unmapped paths
*/
"use strict";

function trace(m) { // comment or un-comment as needed for debugging:
//    console.log(m);
}
function trace_info(m) { // comment or un-comment as needed for debugging:
    console.log(m);
}

function show404(response) {
    setTimeout(function () {
        response.writeHead(404, {"Content-Type": "text/plain"});
        response.write("404 Not found");
        response.end();
    }, 5000); // delay response to increase difficulty of DOS attacks
}

function route(handle, pathname, response, request) {
    var path1, path2;
    // get 1st part of path, i.e. if pathname is "/foo/bar" or "/foo/", path1 = "/foo"
    // assumption: pathname always starts with '/'
    path1 = '/' + pathname.substr(1).replace(/\/.*$/, "");
    path2 = pathname.substr(path1.length);
    trace('About to route a request for "' + path1 + '", extra path = "' + path2 + '"');
    if (typeof handle[path1] === 'function') {
        handle[path1](response, request, path2);
    } else {
        trace_info("No request handler found for " + path1);
        show404(response);
    }
}

exports.show404 = show404;
exports.route = route;