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     console.log('server handling request')
  29     const serveFile = (fPath) => {
  30       fs.readFile(fPath, { encoding: 'utf8' }, (err, data) => {
  31         if (err || data == undefined) {
  32           response.writeHead(404)
  33           response.end()
  34         }
  35         else {
  36           response.writeHead(200, { 'Content-Type': mime.lookup(fPath) })
  37           response.write(data)
  38           response.end()
  39         }
  40       })
  41     }
  42     const htArgv = request.url.slice(1).split("?")
  43     let routePath = htArgv[0].split('/')
  44     let routeName = routePath[0]
  45     if (routeName === '' || routeName === 'index.html')
  46       serveFile(opts['index'])
  47     else if (routeName in opts['bindings']) {
  48       let localPath = path.normalize(opts['bindings'][routeName].concat(path.sep + routePath.slice(1).join(path.sep)))
  49       if (localPath.includes(opts['bindings'][routeName])) {
  50         fs.readdir(localPath, (err, files) => {
  51           if (err)
  52           serveFile(localPath)
  53           else
  54           serveFile(`${localPath}/index.html`)
  55         })
  56       }
  57       else {
  58         console.log(`SEC: ${localPath} references files not in route`)
  59       }
  60     }
  61     /* TODO: Handle reconnecting host */
  62     else if (routeName in router.routes) {
  63
  64       const route = router.routes[routeName]
  65
  66       /* Client is INIT GET */
  67       if (request.headers['x-strapp-type'] == undefined) {
  68         console.log('client init GET')
  69         response.writeHead(200, { 'Content-Type': 'text/html' })
  70         response.write(`${router.skelPage[0]}${router.clientJS}${router.skelPage[1]}`)
  71         response.end()
  72         //TODO: if route.socket == undefined: have server delay this send until host connects
  73         //      (this happens when a client connects to an active route with no currently-online host)
  74       }
  75       else { /* Client sent offer, waiting for answer */
  76         console.log('Server: Sending client offer to host')
  77         route.socket.send(request.headers['x-strapp-type'])
  78         route.socket.on('message', (hostResponse) => {
  79           console.log('Server: Sending host answer to client')
  80           console.log(hostResponse)
  81           response.writeHead(200, { 'Content-Type': 'application/json' })
  82           response.write(hostResponse)
  83           response.end()
  84
  85         })
  86       }
  87
  88     }
  89     else {
  90       router.routes[routeName] = true
  91       const newRoute = {}
  92       newRoute.host = request.headers['x-forwarded-for'] || request.connection.remoteAddress
  93       getport().then( (port) => {
  94         newRoute.port = port
  95         if (opts['no-tls'])
  96         newRoute.httpd = http.createServer()
  97         else
  98         newRoute.httpd = https.createServer(router.httpsOpts)
  99         newRoute.httpd.listen(newRoute.port)
 100         newRoute.wsd = new ws.Server( { server: newRoute.httpd } )
 101         newRoute.wsd.on('connection', (sock) => {
 102           newRoute.socket = sock
 103           sock.on('message', (msg) => { console.log(`[${newRoute.host}] ${msg}`) })
 104         })
 105         console.log(`Listening for websocket ${newRoute.host} on port ${newRoute.port}`)
 106         router.routes[routeName] = newRoute
 107       }).then(() => {
 108         response.writeHead(200, { 'Content-Type': 'text/html' })
 109         response.write(`${router.skelPage[0]}` +
 110           `\tconst _strapp_port = ${newRoute.port}\n` +
 111           `\tconst _strapp_protocol = '${router.wsProtocol}'\n` +
 112           `${router.hostJS}\n${router.skelPage[1]}`)
 113           response.end()
 114         })
 115       }
 116
 117     }
 118   }
 119
 120   /**
 121   * @summary Boot up the router.  With TLS, we must wait for file reads to sync.
 122   */
 123   if (!opts['no-tls']) {
 124     console.log('tls')
 125     let filesRead = 0
 126     let key = undefined
 127     let cert = undefined
 128     const syncRead = () => {
 129       if (++filesRead == 2) {
 130         if (key == undefined)
 131         console.log(`ERR: Key ${opts['ca-key']} inaccessible, tls will fail`)
 132         if(cert == undefined)
 133         console.log(`ERR: Cert ${opts['ca-cert']} inaccessible, tls will fail`)
 134         else if (key != undefined) {
 135           router.httpsOpts = { cert: cert, key: key}
 136           router.httpd = https.createServer(router.httpsOpts, router.respond)
 137           .listen(opts['port'])
 138         }
 139       }
 140     }
 141     fs.readFile(opts['ca-key'], { encoding: 'utf8' }, (err, data) => {
 142       if (!err) key = data
 143       syncRead()
 144     })
 145     fs.readFile(opts['ca-cert'], { encoding: 'utf8' }, (err, data) => {
 146       if (!err) cert = data
 147       syncRead()
 148     })
 149   }
 150   else
 151   router.httpd = http.createServer(router.respond).listen(opts['port'])
 152
 153   //TODO: if ("electron" in process.versions) open a local renderwindow, and route to it