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
  46
  47     if (routeName === '' || routeName === 'index.html')
  48     serveFile(opts['index'])
  49     else if (routeName in opts['bindings']) {
  50       let localPath = path.normalize(opts['bindings'][routeName].concat(path.sep + routePath.slice(1).join(path.sep)))
  51       if (localPath.includes(opts['bindings'][routeName])) {
  52         fs.readdir(localPath, (err, files) => {
  53           if (err)
  54           serveFile(localPath)
  55           else
  56           serveFile(`${localPath}/index.html`)
  57         })
  58       }
  59       else {
  60         console.log(`SEC: ${localPath} references files not in route`)
  61       }
  62     }
  63     /* TODO: Handle reconnecting host */
  64     else if (routeName in router.routes) {
  65       const route = router.routes[routeName]
  66       const clients = route['clients']
  67       const headerData = request.headers['x-strapp-type']
  68
  69
  70
  71
  72       /* Client is INIT GET */
  73       if (headerData === undefined) {
  74         console.log('client init GET')
  75         response.writeHead(200, { 'Content-Type': 'text/html' })
  76         response.write(`${router.skelPage[0]}${router.clientJS}${router.skelPage[1]}`)
  77         response.end()
  78         //TODO: if route.socket == undefined: have server delay this send until host connects
  79         //      (this happens when a client connects to an active route with no currently-online host)
  80       }
  81       else if (headerData.localeCompare('ice-candidate-request') === 0) {
  82         console.log('Server: received ice-candidate-request from Client')
  83         let pubKey = request.headers['x-client-pubkey']
  84         clients.set(pubKey, response)
  85         pubKey = '{ "pubKey": "'  + pubKey + '" }'
  86         route.socket.send(pubKey)
  87       }
  88       else if (headerData.localeCompare('ice-candidate-submission') === 0) {
  89         console.log('Server: recieved ice-candidate-submission from Client')
  90         let data = []
  91         request.on('data', (chunk) => {
  92           data.push(chunk)
  93         }).on('end', () => {
  94           console.log('Sending ice-candidate-submission to Host')
  95           data = Buffer.concat(data).toString();
  96           clients.set(JSON.parse(data)['pubKey'], response)
  97           route.socket.send(data)
  98         })
  99       }
 100       else if (headerData.localeCompare('client-sdp-offer') === 0){ /* Client sent offer, waiting for answer */
 101         console.log('Server: Sending client offer to host')
 102         clients.set(JSON.parse(request.headers['x-client-offer'])['pubKey'], response)
 103         route.socket.send(request.headers['x-client-offer'])
 104       } else {
 105         console.log('Unhandled stuff')
 106         console.log(request.headers)
 107       }
 108
 109     }
 110     else {
 111       router.routes[routeName] = true
 112       const newRoute = {}
 113       newRoute.clients = new Map([])
 114       newRoute.host = request.headers['x-forwarded-for'] || request.connection.remoteAddress
 115       getport().then( (port) => {
 116         newRoute.port = port
 117         if (opts['no-tls'])
 118         newRoute.httpd = http.createServer()
 119         else
 120         newRoute.httpd = https.createServer(router.httpsOpts)
 121         newRoute.httpd.listen(newRoute.port)
 122         newRoute.wsd = new ws.Server( { server: newRoute.httpd } )
 123         newRoute.wsd.on('connection', (sock) => {
 124           console.log(`${routeName} server has been established`)
 125           newRoute.socket = sock
 126
 127           /* Handle all messages from host */
 128           sock.on('message', (hostMessage) => {
 129             hostMessage = JSON.parse(hostMessage)
 130             response = newRoute.clients.get(hostMessage['clientPubKey'])
 131
 132             /* If the host response is a answer */
 133             if (hostMessage['cmd'].localeCompare('< sdp pubKey') === 0) {
 134               console.log('Server: Sending host answer to client')
 135               response.writeHead(200, { 'Content-Type': 'application/json' })
 136               response.write(JSON.stringify(hostMessage))
 137               response.end()
 138             }
 139             else if (hostMessage['cmd'].localeCompare('< ice pubKey') === 0){
 140               /* if the host response is an ice candidate */
 141               console.log('Server: Sending host ice candidate')
 142               let iceCandidateAvailable = hostMessage['iceCandidateAvailable']
 143               /* If there are any ice candidates, send them back */
 144               if (iceCandidateAvailable) {
 145                 response.writeHead('200', {'x-strapp-type': 'ice-candidate-available'})
 146                 response.write(JSON.stringify(hostMessage))
 147                 response.end()
 148               }
 149               else { /* If not, srequest processed successfully, but there isnt anything yet*/
 150                 console.log('Server: No ice candidate available for response')
 151                 response.writeHead('204', {'x-strapp-type': 'ice-candidate-unavailable'})
 152                 response.end()
 153               }
 154             }
 155             else {
 156               console.log('unhandled message cmd from host')
 157             }
 158
 159           })
 160         })
 161
 162         console.log(`Listening for websocket ${newRoute.host} on port ${newRoute.port}`)
 163         router.routes[routeName] = newRoute
 164       }).then(() => {
 165         response.writeHead(200, { 'Content-Type': 'text/html' })
 166         response.write(`${router.skelPage[0]}` +
 167           `\tconst _strapp_port = ${newRoute.port}\n` +
 168           `\tconst _strapp_protocol = '${router.wsProtocol}'\n` +
 169           `${router.hostJS}\n${router.skelPage[1]}`)
 170           response.end()
 171         })
 172       }
 173
 174
 175     }
 176   }
 177
 178   /**
 179   * @summary Boot up the router.  With TLS, we must wait for file reads to sync.
 180   */
 181   if (!opts['no-tls']) {
 182     console.log('tls')
 183     let filesRead = 0
 184     let key = undefined
 185     let cert = undefined
 186     const syncRead = () => {
 187       if (++filesRead == 2) {
 188         if (key == undefined)
 189         console.log(`ERR: Key ${opts['ca-key']} inaccessible, tls will fail`)
 190         if(cert == undefined)
 191         console.log(`ERR: Cert ${opts['ca-cert']} inaccessible, tls will fail`)
 192         else if (key != undefined) {
 193           router.httpsOpts = { cert: cert, key: key}
 194           router.httpd = https.createServer(router.httpsOpts, router.respond)
 195           .listen(opts['port'])
 196         }
 197       }
 198     }
 199     fs.readFile(opts['ca-key'], { encoding: 'utf8' }, (err, data) => {
 200       if (!err) key = data
 201       syncRead()
 202     })
 203     fs.readFile(opts['ca-cert'], { encoding: 'utf8' }, (err, data) => {
 204       if (!err) cert = data
 205       syncRead()
 206     })
 207   }
 208   else
 209   router.httpd = http.createServer(router.respond).listen(opts['port'])
 210
 211   //TODO: if ("electron" in process.versions) open a local renderwindow, and route to it