main.js

   1 /**
   2 * @file      Node entry and main driver
   3 * @author    Jordan Lavatai, Ken Grimes
   4 * @version   0.0.1
   5 * @license   AGPL-3.0
   6 * @copyright loljk 2017
   7 * @summary   HTTP(S) Router that uses the first directory in the requested URL
   8 *            as the route name
   9 */
  10 const fs = require('fs')
  11 const ws = require('ws')
  12 const path = require('path')
  13 const http = require('http')
  14 const https = require('https')
  15 const getport = require('get-port')
  16 const mime = require('mime')
  17 const opts = require('./opts.js')
  18
  19 const router = {
  20   skelPage:   fs.readFileSync('./skel.html', { encoding: 'utf8' }).split('<!--STRAPP_SRC-->'),
  21   clientJS:   fs.readFileSync(opts['client-js']),
  22   hostJS:     fs.readFileSync(opts['host-js']),
  23   routes:     {},
  24   httpsOpt:   undefined,
  25   httpd:      undefined,
  26   wsProtocol: opts['no-tls'] ? 'ws' : 'wss',
  27   respond:    (request,response) => {
  28     const serveFile = (fPath) => {
  29       fs.readFile(fPath, { encoding: 'utf8' }, (err, data) => {
  30         if (err || data == undefined) {
  31           response.writeHead(404)
  32           response.end()
  33         }
  34         else {
  35           response.writeHead(200, { 'Content-Type': mime.lookup(fPath) })
  36           response.write(data)
  37           response.end()
  38         }
  39       })
  40     }
  41     const htArgv = request.url.slice(1).split("?")
  42     let routePath = htArgv[0].split('/')
  43     let routeName = routePath[0]
  44     if (routeName === '' || routeName === 'index.html')
  45     serveFile(opts['index'])
  46     else if (routeName in opts['bindings']) {
  47       let localPath = path.normalize(opts['bindings'][routeName].concat(path.sep + routePath.slice(1).join(path.sep)))
  48       if (localPath.includes(opts['bindings'][routeName])) {
  49         fs.readdir(localPath, (err, files) => {
  50           if (err)
  51           serveFile(localPath)
  52           else
  53           serveFile(`${localPath}/index.html`)
  54         })
  55       }
  56       else {
  57         console.log(`SEC: ${localPath} references files not in route`)
  58       }
  59     }
  60     else if (routeName in router.routes) {
  61       const route = router.routes[routeName]
  62       response.writeHead(200, { 'Content-Type': 'text/html' })
  63       response.write(`${router.skelPage[0]}${router.clientJS}${router.skelPage[1]}`)
  64       response.end()
  65       //TODO: if route.socket == undefined: have server delay this send until host connects
  66       //      (this happens when a client connects to an active route with no currently-online host)
  67       route.socket.send(request.headers['x-forwarded-for'] || request.connection.remoteAddress)
  68     }
  69     else {
  70       router.routes[routeName] = true
  71       const newRoute = {}
  72       newRoute.host = request.headers['x-forwarded-for'] || request.connection.remoteAddress
  73       getport().then( (port) => {
  74         newRoute.port = port
  75         if (opts['no-tls'])
  76         newRoute.httpd = http.createServer()
  77         else
  78         newRoute.httpd = https.createServer(router.httpsOpts)
  79         newRoute.httpd.listen(newRoute.port)
  80         newRoute.wsd = new ws.Server( { server: newRoute.httpd } )
  81         newRoute.wsd.on('connection', (sock) => {
  82           newRoute.socket = sock
  83           sock.on('message', (msg) => { console.log(`[${newRoute.host}] ${msg}`) })
  84         })
  85         console.log(`Listening for websocket ${newRoute.host} on port ${newRoute.port}`)
  86         router.routes[routeName] = newRoute
  87       }).then(() => {
  88         response.writeHead(200, { 'Content-Type': 'text/html' })
  89         response.write(`${router.skelPage[0]}` +
  90           `\tconst _strapp_port = ${newRoute.port}\n` +
  91           `\tconst _strapp_protocol = '${router.wsProtocol}'\n` +
  92           `${router.hostJS}\n${router.skelPage[1]}`)
  93           response.end()
  94         })
  95       }
  96
  97     }
  98   }
  99
 100   /**
 101   * @summary Boot up the router.  With TLS, we must wait for file reads to sync.
 102   */
 103   if (!opts['no-tls']) {
 104     let filesRead = 0
 105     let key = undefined
 106     let cert = undefined
 107     const syncRead = () => {
 108       if (++filesRead == 2) {
 109         if (key == undefined)
 110         console.log(`ERR: Key ${opts['ca-key']} inaccessible, tls will fail`)
 111         if(cert == undefined)
 112         console.log(`ERR: Cert ${opts['ca-cert']} inaccessible, tls will fail`)
 113         else if (key != undefined) {
 114           router.httpsOpts = { cert: cert, key: key}
 115           router.httpd = https.createServer(router.httpsOpts, router.respond)
 116           .listen(opts['port'])
 117         }
 118       }
 119     }
 120     fs.readFile(opts['ca-key'], { encoding: 'utf8' }, (err, data) => {
 121       if (!err) key = data
 122       syncRead()
 123     })
 124     fs.readFile(opts['ca-cert'], { encoding: 'utf8' }, (err, data) => {
 125       if (!err) cert = data
 126       syncRead()
 127     })
 128   }
 129   else
 130   router.httpd = http.createServer(router.respond).listen(opts['port'])
 131
 132   //TODO: if ("electron" in process.versions) open a local renderwindow, and route to it