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encoding = require('encoding'),
crypto = require('crypto'),
Debug = require('@superhero/debug'),
Socket = require('net').Socket,
Events = require('events'),
version = require('./package.json').version,
Codec = require('./codec')
module.exports = class
{
constructor(options)
{
this.config = Object.assign(
{
debug : true,
reconnect : false,
onClose : false
}, options)
const debug = new Debug({ debug:this.config.debug, prefix:'ws client:' })
this.log = debug.log.bind(debug)
this.events = new Events()
this.socket = new Socket()
for(let event of ['close','connect','data','drain','end','lookup','ready'])
this.socket.on(event, () => this.log(event))
for(let event of ['error'])
this.socket.on(event, (...a) => this.log(event, ...a))
}
get key()
{
return this._key
? this._key
: this._key = crypto.randomBytes(15).toString('base64')
}
get chunks()
{
return this._chunks
? this._chunks
: this._chunks = []
}
connect(port = 80, host = '127.0.0.1', headers)
{
const header = this.composeHeader(headers)
return new Promise((fulfill, reject) =>
this.socket.connect(port, host, () =>
{
this.socket.write(header, (error) =>
{
Iif(error)
{
this.log('error sending handshake', error)
reject(error)
}
else
{
this.log('handshake:', 'sent')
this.socket.once('data', (data) => fulfill( this.handshake(data) ))
}
})
}))
}
handshake(data)
{
return new Promise((fulfill) =>
{
this.log('handshake:', 'received')
const
headers = data.toString().split('\r\n'),
foundAcceptHeader = headers.some((line) =>
{
if(!line.toLowerCase().startsWith('sec-websocket-accept'))
return false
const signature = (line.split(':')[1] || '').trim()
Eif(signature === Codec.signature(this.key))
{
this.log('handshake:', 'verified')
this.socket.on('data', this.onData.bind(this))
fulfill()
}
else
{
this.log('handshake:', 'invalid:', 'signature:', signature)
const error = new Error('invalid websocket handshake')
error.code = 'ERR_WEBSOCKET_HANDSHAKE_INVALID'
throw error
}
return true
})
Iif(!foundAcceptHeader)
{
this.log('handshake:', 'missing "Sec-WebSocket-Accept" header')
const error = new Error('missing "Sec-WebSocket-Accept" header')
error.code = 'ERR_WEBSOCKET_HANDSHAKE_MISSING_SIGNATURE'
throw error
}
})
}
composeHeader(headers = {})
{
headers = Object.assign(
{ 'User-Agent' : `Superhero Websocket Client/${version}` },
headers,
{ 'Sec-WebSocket-Key' : this.key })
let header = ''
for(const key in headers)
header += `${key} : ${headers[key]}\r\n`
return header + '\r\n'
}
onData(buffer)
{
this.log('received message')
buffer = Buffer.concat([this.buffer, buffer].filter(_ => _))
for(const decoded of Codec.decode(buffer))
{
this.buffer = decoded.buffer
try
{
this.chunks.push(decoded.msg)
const
msg = this.chunks.join(),
dto = JSON.parse(msg)
this.chunks.length = 0
this.log('received message:', dto)
this.events.emit(dto.event, dto.data)
}
catch(error)
{
this.log(error)
this.log('a message could not be parsed:', this.chunks)
}
}
}
emit(event, data)
{
if(typeof event !== 'string')
throw new TypeError('event must be a string')
const
dto = JSON.stringify({ event, data }),
masked = true,
encoded = Codec.encode(dto, masked)
return new Promise((fulfill, reject) =>
this.socket.write(encoded, (error) =>
{
Iif(error)
{
this.log('error emitting:', event, data, error)
reject(error)
}
else
{
this.log('emitted:', event, data)
fulfill()
}
}))
}
}
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