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Debug = require('@superhero/debug'),
Server = require('net').Server,
Events = require('events'),
Codec = require('./codec')
module.exports = class
{
constructor(options)
{
this.config = Object.assign(
{
debug : true,
onClose : false
}, options)
const debug = new Debug({ debug:this.config.debug, prefix:'ws server:' })
this.log = debug.log.bind(debug)
this.events = new Events()
this.server = new Server()
this.sockets = []
// ping-pong to keep the connection alive
// this is not part of the standard, but it's required becouse of
// limitations in the browser api
// https://tools.ietf.org/html/rfc6455#page-29
this.events.on('ping', (socket) => socket.emit('pong'))
for(let event of ['close','connection','listening'])
this.server.on(event, () => this.log(event))
for(let event of ['error'])
this.server.on(event, (...a) => this.log(event, ...a))
this.server.on('connection', this.onConnection.bind(this))
}
onConnection(socket)
{
this.sockets.push(socket)
for(let event of ['close','connection','drain','end','lookup','timeout'])
socket.on(event, () => this.log('socket:', event))
for(let event of ['error'])
socket.on(event, (...a) => this.log('socket:', event, ...a))
const ctx = { socket }
ctx.emit = this.emit.bind(this, socket)
ctx.chunks = []
socket.on('data', this.onData .bind(this, ctx))
socket.on('close', this.onClose.bind(this, ctx))
}
onData(ctx, data)
{
this.log('socket:', 'data')
// messages can come in multiple chunks that needs to be glued together
ctx.buffer = Buffer.concat([ctx.buffer, data].filter(_ => _))
if(!ctx.headers)
this.handshake(ctx)
Eif(ctx.headers)
this.dispatch(ctx)
}
onClose(ctx)
{
this.sockets.splice(this.sockets.indexOf(ctx.socket), 1)
this.config.onClose && this.config.onClose(ctx)
}
handshake(ctx)
{
this.log('socket:', 'handshake:', 'received')
const s = ctx.buffer.toString()
Eif(s.match(/\r\n\r\n/))
{
// parse headers and store remaining buffer
const
parts = s.split('\r\n\r\n'),
rows = parts.shift().split('\r\n'),
buffer = parts.join(''),
divided = rows.map((row) => row.split(':').map((item) => item.trim())),
headers = divided.reduce((obj, header) =>
{
obj[header[0].toLowerCase()] = header[1]
return obj
}, {}),
key = headers['sec-websocket-key'],
signature = Codec.signature(key)
Iif(!key)
{
this.log('socket:', 'handshake:', 'sec-websocket-key missing')
ctx.socket.destroy()
return
}
Iif(key.length < 10)
{
this.log('socket:', 'handshake:', 'sec-websocket-key to short', key)
socket.destroy()
return
}
this.log('socket:', 'handshake:', 'received:', 'key:', key)
ctx.headers = headers
ctx.buffer = Buffer.from(buffer)
// write headers back to the client and establish a handshake
ctx.socket.write(
[
'HTTP/1.1 101 Switching Protocols',
'Upgrade: WebSocket',
'Connection: Upgrade',
'Sec-WebSocket-Accept: ' + signature
].join('\r\n') + '\r\n\r\n',
(error) =>
{
error
? this.log('socket:', 'handshake:', 'error:', error)
: this.log('socket:', 'handshake:', 'sent:', 'signature:', signature)
})
}
else
{
this.log('socket:', 'handshake:', 'header incomplete')
}
}
dispatch(ctx)
{
// messages can also come in the same chunk that needs to be divided...
for(const decoded of Codec.decode(ctx.buffer))
{
ctx.buffer = decoded.buffer
// destroys the socket if specific 2 bytes
// well, this works.. but I have no clue why, the specifications
// states [0xFF][0x00]. Or if older protocol: [0x00][message][0xFF]
Iif(decoded.msg.length == 2
&&(decoded.msg.charCodeAt(0) == 3 && decoded.msg.charCodeAt(1) == 233)
||(decoded.msg.charCodeAt(0) == 3 && decoded.msg.charCodeAt(1) == 65533))
{
ctx.socket.destroy()
break
}
else
{
try
{
ctx.chunks.push(decoded.msg)
const
msg = ctx.chunks.join(),
dto = JSON.parse(msg)
ctx.chunks.length = 0
this.log('received message:', dto)
this.events.emit(dto.event, ctx, dto.data)
}
catch(error)
{
this.log(error)
this.log('a message could not be parsed:', ctx.chunks)
}
}
}
}
emit(socket, event, data, toAll)
{
this.log('emitting, to everyone:', !!toAll, 'event:', event, 'data:', data)
const
dto = JSON.stringify({ event, data }),
encoded = Codec.encode(dto)
const promises = []
for(let soc of (toAll ? this.sockets : [socket]))
promises.push(
new Promise((fulfill, reject) =>
soc.write(encoded, (error) =>
{
Iif(error)
{
this.log('error emitting:', event, data, error)
reject(error)
}
else
{
this.log('emitted:', event, data)
fulfill()
}
})))
return Promise.all(promises)
}
}
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