goldilocks.js/lib/ddns/index.js

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'use strict';
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module.exports.create = function (deps, conf) {
var network = deps.PromiseA.promisifyAll(deps.recase.camelCopy(require('network')));
var loopback = require('./loopback').create(deps, conf);
var dnsCtrl = require('./dns-ctrl').create(deps, conf);
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var localAddr, gateway;
var tunnelActive = false;
async function checkNetworkEnv() {
// Since we can't detect the OS level events when a user plugs in an ethernet cable to recheck
// what network environment we are in we check our local network address and the gateway to
// determine if we need to run the loopback check and router configuration again.
var gw = await network.getGatewayIpAsync();
var addr = await network.getPrivateIpAsync();
if (localAddr === addr && gateway === gw) {
return;
}
localAddr = addr;
gateway = gw;
var loopResult = await loopback('seth.daplie.me');
var notLooped = Object.keys(loopResult.ports).filter(function (port) {
return !loopResult.ports[port];
});
// if (notLooped.length) {
// // TODO: try to automatically configure router to forward ports to us.
// }
// If we are on a public accress or all ports we are listening on are forwarded to us then
// we don't need the tunnel and we can set the DNS records for all our domains to our public
// address. Otherwise we need to use the tunnel to accept traffic.
if (!notLooped.length) {
if (tunnelActive) {
deps.tunnelClients.disconnect();
tunnelActive = false;
}
} else {
if (!tunnelActive) {
var session = await getSession();
await deps.tunnelClients.start(session, conf.dns.domains);
tunnelActive = true;
}
}
}
async function getSession() {
var sessions = await deps.storage.owners.all();
var session = sessions.filter(function (sess) {
return sess.token.scp.indexOf('dns') >= 0;
})[0];
if (!session) {
throw new Error('no sessions with DNS grants');
}
// The OAUTH3 library stores some things on the root session object that we usually
// just leave inside the token, but we need to pull those out before we use it here
session.provider_uri = session.provider_uri || session.token.provider_uri || session.token.iss;
session.client_uri = session.client_uri || session.token.azp;
session.scope = session.scope || session.token.scp;
return session;
}
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var publicAddress;
async function recheckPubAddr() {
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if (!conf.ddns.enabled) {
return;
}
await checkNetworkEnv();
if (tunnelActive) {
return;
}
var session = await getSession();
var directives = await deps.OAUTH3.discover(session.token.aud);
var addr = await loopback.checkPublicAddr(directives.api);
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if (publicAddress === addr) {
return;
}
if (conf.debug) {
console.log('previous public address',publicAddress, 'does not match current public address', addr);
}
await dnsCtrl.setDeviceAddress(session, addr, conf.ddns.domains);
publicAddress = addr;
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}
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recheckPubAddr();
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setInterval(recheckPubAddr, 5*60*1000);
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return {
loopbackServer: loopback.server
, setDeviceAddress: dnsCtrl.setDeviceAddress
, getDeviceAddresses: dnsCtrl.getDeviceAddresses
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, recheckPubAddr: recheckPubAddr
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};
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};