add --domain option to enable localtunnel servers on subdomains

README.md

@@ -29,6 +29,8 @@ bin/server --port 1234
 
 The localtunnel server is now running and waiting for client requests on port 1234. You will most likely want to set up a reverse proxy to listen on port 80 (or start localtunnel on port 80 directly).
 
+**NOTE** By default, localtunnel will use subdomains for clients, if you plan to host your localtunnel server itself on a subdomain you will need to use the _--domain_ option and specify the domain name behind which you are hosting localtunnel. (i.e. my-localtunnel-server.example.com)
+
 #### use your server
 
 You can now use your domain with the `--host` flag for the `lt` client.

bin/server

@@ -24,6 +24,9 @@ const argv = optimist
         default: '0.0.0.0',
         describe: 'IP address to bind to'
     })
+    .options('domain', {
+        describe: 'Specify the base domain name. This is optional if hosting localtunnel from a regular example.com domain. This is required if hosting a localtunnel server from a subdomain (i.e. lt.example.dom where clients will be client-app.lt.example.come)',
+    })
     .options('max-sockets', {
         default: 10,
         describe: 'maximum number of tcp sockets each client is allowed to establish at one time (the tunnels)'
@@ -37,7 +40,8 @@ if (argv.help) {
 
 const server = CreateServer({
     max_tcp_sockets: argv['max-sockets'],
-    secure: argv.secure
+    secure: argv.secure,
+    domain: argv.domain,
 });
 
 server.listen(argv.port, argv.address, () => {

package.json

@@ -18,7 +18,7 @@
     "on-finished": "2.3.0",
     "optimist": "0.6.1",
     "pump": "2.0.0",
-    "tldjs": "1.6.2"
+    "tldjs": "2.3.1"
   },
   "devDependencies": {
     "localtunnel": "1.8.0",

server.js

@@ -9,13 +9,16 @@ import ClientManager from './lib/ClientManager';
 
 const debug = Debug('localtunnel:server');
 
-function GetClientIdFromHostname(hostname) {
-    return tldjs.getSubdomain(hostname);
-}
-
 export default function(opt) {
     opt = opt || {};
 
+    const validHosts = (opt.domain) ? [opt.domain] : undefined;
+    const myTldjs = tldjs.fromUserSettings({ validHosts });
+
+    function GetClientIdFromHostname(hostname) {
+        return myTldjs.getSubdomain(hostname);
+    }
+
     const manager = new ClientManager(opt);
 
     const schema = opt.secure ? 'https' : 'http';

test/domain.js

@@ -0,0 +1,52 @@
+import http from 'http';
+import url from 'url';
+import assert from 'assert';
+import localtunnel from 'localtunnel';
+
+import CreateServer from '../server';
+
+const localtunnel_server = CreateServer({
+    domain: 'domain.example.com',
+});
+
+process.on('uncaughtException', (err) => {
+    console.error(err);
+});
+
+process.on('unhandledRejection', (reason, promise) => {
+    console.error(reason);
+});
+
+suite('domain');
+
+var lt_server_port;
+
+before('set up localtunnel server', function(done) {
+    var server = localtunnel_server.listen(function() {
+        lt_server_port = server.address().port;
+        done();
+    });
+});
+
+test('landing page', function(done) {
+    var opt = {
+        host: 'localhost',
+        port: lt_server_port,
+        headers: {
+            host: 'domain.example.com'
+        },
+        path: '/'
+    }
+
+    var req = http.request(opt, function(res) {
+        res.setEncoding('utf8');
+        assert.equal(res.headers.location, 'https://localtunnel.github.io/www/')
+        done();
+    });
+
+    req.end();
+});
+
+after('shutdown', function() {
+    localtunnel_server.close();
+});

yarn.lock

@@ -977,6 +977,10 @@ pump@2.0.0:
     end-of-stream "^1.1.0"
     once "^1.3.1"
 
+punycode@^1.4.1:
+  version "1.4.1"
+  resolved "https://registry.yarnpkg.com/punycode/-/punycode-1.4.1.tgz#c0d5a63b2718800ad8e1eb0fa5269c84dd41845e"
+
 qs@~5.2.0:
   version "5.2.1"
   resolved "https://registry.yarnpkg.com/qs/-/qs-5.2.1.tgz#801fee030e0b9450d6385adc48a4cc55b44aedfc"
@@ -1146,9 +1150,11 @@ supports-color@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-2.0.0.tgz#535d045ce6b6363fa40117084629995e9df324c7"
 
-tldjs@1.6.2:
+tldjs@2.3.1:
-  version "1.6.2"
+  version "2.3.1"
-  resolved "https://registry.yarnpkg.com/tldjs/-/tldjs-1.6.2.tgz#0d8b7145651f1052ac0b3c688843296636183b13"
+  resolved "https://registry.yarnpkg.com/tldjs/-/tldjs-2.3.1.tgz#cf09c3eb5d7403a9e214b7d65f3cf9651c0ab039"
+  dependencies:
+    punycode "^1.4.1"
 
 to-iso-string@0.0.2:
   version "0.0.2"