domotz-remote-pawn/src/upnp/upnpHttpServer.js

Domotz Agent

/** This file is part of Domotz Agent.
  * Copyright (C) 2016  Domotz Ltd
  *
  * Domotz Agent is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
  *
  * Domotz Agent is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Domotz Agent.  If not, see <http://www.gnu.org/licenses/>.
  **/
/**
 * Created by Massimiliano Cuzzoli <mcuzzoli@domotz.com> on 20/04/15.
 *
 */


var factory = function (resourceLocator) {

    var host = resourceLocator.discovery.host;
    var server = resourceLocator.http.createServer();

    var ret = {
        start: function () {
            server.listen(0);
            console.log("HTTP UPNP Server listening on port:" + server.address().port);
            return ret;
        },
        getHttpServerUrl: function() {
            return 'http://' + host.getIP() + ':' + server.address().port;
        }
    };

    var handleEvent = function (request, response) {
        if (request.method !== 'NOTIFY') {
            console.log('Received unknown method : ' + request.method);
            response.writeHead(400);
            response.end();
            return;
        }

        var errorCode = checkForHeadersErrors(request.headers);
        if (errorCode) {
            console.log('Invalid headers : ' + JSON.stringify(request.headers));
            response.writeHead(errorCode);
            response.end();
            return;
        }

        resourceLocator.upnp.eventHandler.handleUpnpEvent(request, response, resourceLocator);
    };

    var checkForHeadersErrors = function (headers) {

        if (!headers.nt  || !headers.nts) {
            return 400;
        }

        if (headers.nt !== 'upnp:event' || headers.nts !== 'upnp:propchange') {
            return 412;
        }

        if (!headers.sid || !resourceLocator.upnp.registry.getSubscriptionById(headers.sid))
        {
            console.error("Unknown subscription id:" + headers.sid);
            return 412;
        }
    };

    server.on('request', handleEvent);
    return ret;
};


module.exports.httpServer = factory;