index.js

/*

 ______ _                       _   _             
 \  ___|_)                     | | (_)            
  \ \   _  __ _ _ __ ___   __ _| |_ _  ___  _ __  
   > > | |/ _` | '_ ` _ \ / _` | __| |/ _ \| '_ \ 
  / /__| | (_| | | | | | | (_| | |_| | (_) | | | |
 /_____)_|\__, |_| |_| |_|\__,_|\__|_|\___/|_| |_|
           __/ |                                  
          |___/                                   

*/

//*******************************************************************

'use strict';

//*******************************************************************
// required modules

require('dotenv').config();

var express = require('express');
var helmet = require('helmet');
var cors = require('cors');

var path = require('path');
var fsr = require('file-stream-rotator');
var mkdirp = require('mkdirp');
var morgan = require('morgan');

var mathjax = require("mathjax-node/lib/mj-single.js");

var sigma = require('./controllers/sigma.js');

//*******************************************************************
// mathjax

mathjax.config({
	MathJax: {
		// traditional MathJax configuration 
	}
});
mathjax.start();

//*******************************************************************
// environment variables

var PORT = process.env.PORT;

//*******************************************************************
//express

var app = express();

app.use(cors());
app.use(helmet());

// **********************************************************
// log

var logDirectory = path.join(__dirname,'/log');
    
mkdirp(logDirectory);

var accessLogStream = fsr.getStream({
    filename: logDirectory + '/fs-epermit-api-%DATE%.log',
    frequency: 'daily',
    verbose: false
});

app.use(morgan('combined', {stream: accessLogStream}));

//*******************************************************************
// public 
app.use(express.static('public'));

//*******************************************************************
// routes

app.get('/math(.:ext)', function(req,res){

	sigma.process(req, res, mathjax);	
});

app.get('/math', function(req,res){

	sigma.process(req, res, mathjax);	
});

//*******************************************************************
// listen

var server = app.listen(PORT, function () {

  var host = server.address().address;
  var port = server.address().port;

  console.log('\n  listening at http://%s:%s', host, port);

});

//*******************************************************************
// exports

module.exports = app;

//*******************************************************************