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