app.js

// ***
// *** Required modules
// ***
var express = require('express');
var OpenTokLibrary = require('opentok');

// ***
// *** OpenTok Constants for creating Session and Token values
// ***
var OTKEY = process.env.TB_KEY;
var OTSECRET = process.env.TB_SECRET;
var OpenTokObject = new OpenTokLibrary.OpenTokSDK(OTKEY, OTSECRET);

// ***
// *** Setup Express to handle static files in public folder
// *** Express is also great for handling url routing
// ***
var app = express();
app.use(express.static(__dirname + '/public'));
app.set( 'views', __dirname + "/views");
app.set( 'view engine', 'ejs' );

// ***
// *** When user goes to root directory, render index page
// ***
app.get("/", function( req, res ){
  // make sure that we are always in https
  if(req.header('x-forwarded-proto')!="https" && process.env.NODE_ENV == "production" ){
    res.redirect( 'https://opentokrtc.com' );
  }else{
    res.render( 'index' );
  }
});

var rooms = {};

app.get("/:rid", function( req, res ){
  // make sure that we are always in https
  console.log( req.url );
  if(req.header('x-forwarded-proto')!="https" && process.env.NODE_ENV == "production" ){
    res.redirect( 'https://opentokrtc.com'+req.url );
    return;
  }

  // find request format, json or html?
  var path = req.params.rid.split(".json");
  var rid = path[0];
  var room_uppercase = rid.toUpperCase();

  // Generate sessionId if there are no existing session Id's
  if( !rooms[room_uppercase] ){
    // check to see if user wants a p2p session
    var session_property = ( room_uppercase.split('P2P').length > 1 ) ? {'p2p.preference': 'enabled'} : {'p2p.preference':'disabled'}

    OpenTokObject.createSession( session_property, function(sessionId){
      rooms[ room_uppercase ] = sessionId;
      returnRoomResponse( res, { rid: rid, sid: sessionId }, path[1]);
    });
  }else{
    returnRoomResponse( res, { rid: rid, sid: rooms[rid.toUpperCase()] }, path[1]);
  }
});

function returnRoomResponse( res, data, json ){
  data.apiKey = OTKEY;
  data.token = OpenTokObject.generateToken( {session_id: data.sid, role:OpenTokLibrary.RoleConstants.MODERATOR} );
  if( json == "" ){ // empty string = json exists, undefined means json does not exist
    res.header('Access-Control-Allow-Origin', '*');
    res.header('Access-Control-Allow-Methods', 'GET');
    res.json( data );
  }else{
    res.render( 'room', data );
  }
}

// ***
// *** start server, listen to port (predefined or 9393)
// ***
var port = process.env.PORT || 5000;
app.listen(port);