Added support for HTTPS and custom port on attach.

README.md

@@ -226,7 +226,7 @@ const chat = new IO( 'chat' )
 
 ## API
 
-### .attach( `Koa app` )
+### .attach( `Koa app`, `Object config<optional>` )
 
 Attaches to a koa application
 
@@ -235,6 +235,28 @@ io.attach( app )
 app.listen( process.env.PORT )
 ```
 
+Config:
+```js
+{
+  port: 80, // Your custom port
+  https: {
+     key: 'path_to_your_private_key.pem',
+     cert: 'path_to_your_certificate.pem'
+  }
+}
+```
+
+Usage with config:
+```js
+io.attach(app, {
+    port: 8081,
+    https: {
+        key: '/etc/letsencrypt/domain/key.pem',
+        cert: '/etc/letsencrypt/domain/cert.pem'
+    }
+})
+```
+
 ### .use( `Function callback` )
 
 Applies middleware to the stack.

index.js

@@ -1,7 +1,9 @@
 
 "use strict";
 
+const fs = require('fs')
 const http = require( 'http' )
+const https = require( 'https' )
 const socketIO = require( 'socket.io' )
 const compose = require( 'koa-compose' )
 
@@ -95,20 +97,41 @@ module.exports = class IO {
   /**
    * Attach to a koa application
    * @param app <Koa app> the koa app to use
+   * @param config <Attach config> Configuration object to be used during attaching to the app
    */
-  attach( app ) {
+  attach( app, config ) {
 
     if ( app.server && app.server.constructor.name != 'Server' ) {
       throw new Error( 'app.server already exists but it\'s not an http server' );
     }
 
     if ( !app.server ) {
       // Create a server if it doesn't already exists
-      app.server = http.createServer( app.callback() )
+      if (config.https) {
+        if (config.https.key && config.https.cert) {
+          if (typeof config.https.key === 'string' && typeof config.https.cert === 'string') {
+            app.server = https.createServer({
+              key: fs.readFileSync(config.https.key),
+              cert: fs.readFileSync(config.https.cert)
+            }, app.callback())
+          } else {
+            throw new Error('Specified wrong type of key/cert for HTTPS. Use string type.')
+          }
+        } else {
+          throw new Error('Specified partial set of parameters to initialize HTTPS. Specify key and cert paths.');
+        }
+      } else {
+        app.server = http.createServer(app.callback());
+      }
 
       // Patch `app.listen()` to call `app.server.listen()`
-      app.listen = function listen(){
-        app.server.listen.apply( app.server, arguments )
+      app.listen = function listen(port, ...args){
+        if (config.port) {
+          port = config.port;
+        }
+        args.unshift(port);
+
+        app.server.listen.apply( app.server, args );
         return app.server
       }
     }