server.js

var isProd = process.env.NODE_ENV === 'production'
var canonicalHost = process.env.CANONICAL_HOST || "http://hyper.mixmix.io"

var Router = require('routes')
var router = Router()
var http = require('http')
var url = require('url')
var fs = require('fs')
var request = require('request')
var stringify = require('json-stringify-safe') 

var treeBuild = require('./treeBuild')
var treePartialRender = require('./treePartialRender')
var fetchAuthors = require('./fetchAuthors')
var regexps = require('./regexps')


router.addRoute('/', rootRequestResponse)
function rootRequestResponse(req, res, match) {
  var referer = req.headers.referer || ''
  //linked from an md file?
  if (referer.match( regexps.mdUrl )) {
    res.writeHead(302, {'Location': 'http://hyper.mixmix.io/?source=' + referer, })
    res.end()
  } 
  else {
    res.writeHead(200, {'content-type': 'text/html'})
    fs.createReadStream('./index.html').pipe(res)
  }
}

router.addRoute('/api/render', buildHypermarkdownTree)
function buildHypermarkdownTree(req, res, match) {
  var requestDetails = url.parse(req.url, true)
  var source = requestDetails.query.source

  if (source && source.match( regexps.mdUrl ) ) {
    treeBuild(source, function(err, tree) {
      if (err) { 
        res.writeHead(400, {'content-type': 'text/plain'})
        res.write("You've hit a bad url somewhere in there, we got the error:<br />"+ err)
        res.end()
        return
      }

      res.writeHead(200, {'content-type': 'application/json'})

      tree = treePartialRender(tree)
      res.write( stringify(tree, null, 2) )
      res.end()
    })
  }
  else {
    res.writeHead(400, {'content-type': 'text/plain'})
    res.write("You need to provide a link to a markdown file. <br />Check you're using the format <strong>/?source=address_to_file.md</strong> or <strong>/api/render/?source=address_to_file.md</strong> if you're using the API")
    res.end()
  }
}

//router.addRoute('/api/authors', authorsResponse)
//function authorsResponse(req, res, match) {
  //var requestDetails = url.parse(req.url, true)
  //var source = requestDetails.query.source

  //if (source && source.match( regexps.mdUrl ) && source.match( regexps.githublab )) {
    //var ownerAndRepo = source.match(/.*github.com\/([\w-_]+\/[\w-_]+)/)[1]
    //// this path assumes a lot about the source provided
    //var path = source.match(/.*github.com\/[\w-_]+\/[\w-_]+\/(.*\.md)/)[1].replace('blob/master/', '')

    //fetchAuthors(ownerAndRepo, {path: path}, function(err, users) {
      //if (err) { 
        //res.writeHead(400, {'content-type': 'text/plain'})
        //res.write("You've hit a bad url somewhere in there, we got the error:<br />"+ err)
        //res.end()
        //return
      //}

      //console.log(users)
      //res.writeHead(200, {'content-type': 'application/json'})

      //res.write( stringify(users, null, 2) )
      //res.end()
    //})
  //}
  //else {
    //res.writeHead(400, {'content-type': 'text/plain'})
    //res.write("error or no easy way to determine authors")
    //res.end()
  //}
//}


function handler(req, res) {
  var requestDetails = url.parse(req.url, true)
  var match = router.match(requestDetails.pathname)

  if (match) {
    match.fn(req, res, match)
  }
  // static-resources:
  else if (req.url === '/app.js') {
    fs.createReadStream('./build/client.js').pipe(res)
  }
  else if (req.url === '/clipboard.min.js') {
    fs.createReadStream('./node_modules/clipboard/dist/clipboard.min.js').pipe(res)
  }
  else if (req.url === '/styles.css') {
    fs.createReadStream('./styles.css').pipe(res)
  }
  else if (req.url === '/images/loading.gif') {
    fs.createReadStream('./images/loading.gif').pipe(res)
  }
  else if (req.url === '/images/clippy.svg') {
    fs.createReadStream('./images/clippy.svg').pipe(res)
  }
  else if (requestDetails.path.match( regexps.mdUrl )) {
    // redirects shortened urls
    res.writeHead(302, {'Location': canonicalHost + '/?source=https://www.github.com' + requestDetails.path, })
    res.end()
  }
}



function startServer() {
  var port = process.env.PORT || 5000
  http.createServer( handler ).listen(port)
}

function keepAwake() {
  setInterval(
    function() {
      console.log('POKE')
      http.get(canonicalHost);
    }, 
    300000 // every 5 minutes (300000)
  ) 
}

startServer()
keepAwake()