simple-bit-protocol

BIT protocol state machine

``
npm install @web4/simple-bit-protocol
`

Includes a Noise handshake, and is not backwards compatible with UniChain <= 1

Usage

` js
const Protocol = require('@web4/simple-bit-protocol')

const a = new Protocol(true, {
send (data) { // send hook should send data
b.recv(data)
}
})

const b = new Protocol(false, {
onrequest (channel, message) {
console.log('got request message', message, 'on channel', channel)
},
send (data) {
a.recv(data)
}
})

// send a request message on channel 10
a.request(10, {
index: 42
})
`

API

This is still a work in progress, so that messages supported might change.
See the schema.proto file for the schema for each message.

#### p = new Protocol(isInitator, handlers)

Create a new protocol state machine.

* isInitator is a boolean indicating if you are a client or server
* handlers is a series of functions handling incoming messages

Everytime a binary message should be sent to another peer,
handlers.send(data) is invoked.

If there is a critical error, handlers.destroy(err) is called.

After the initial handshake transport encryption is enabled,
to ensure your stream is private.

To disable transport encryption set handlers.encrypted = false.

To disable the NOISE handshake set handlers.noise = false (works only when encrypted is also set to false).

#### p.recv(data)

Call this with incoming data.

#### buf = p.remoteCapability(key)

Create a remote capability for a key. Use this to verify
if a remote indeed had a key when you get an open message.

#### buf = p.capability(key)

Create a local capability.

#### p.destroy(err)

Destroy the protocol state machine.

#### p.publicKey

The local public key used for authentication.

#### p.remotePublicKey

The remotes public key.

#### p.handshakeHash

The noise handshake hash which uniquely identifies the noise session.

http://noiseprotocol.org/noise.html#channel-binding

#### handlers.onauthenticate(remotePublicKey, done)

Called when you should authenticate a remote public key.

#### handlers.onhandshake()

Called when the initial protocol handshake has finished.

#### p.open(channel, message)

Send an open message on a channel.

Note that if you message.key the protocol, will turn that into a capability that is sent instead of the key.

Receiving an open message triggers handlers.onopen(channel, message)

#### p.options(channel, message)

Send a options message on a channel.

Receiving a handshake message triggers handlers.onoptions(channel, message)

#### p.status(channel, message)

Send a status message on a channel.

Receiving a info message triggers handlers.onstatus(channel, message)

#### p.have(channel, message)

Send a have message on a channel.

Receiving a have message triggers handlers.onhave(channel, message)

#### p.unhave(channel, message)

Send an unhave message on a channel.

Receiving an unhave message triggers handlers.onunhave(channel, message)

#### p.want(channel, message)

Send a want message on a channel.

Receiving a want message triggers handlers.onwant(channel, message)

#### p.unwant(channel, message)

Send an unwant message on a channel.

Receiving an unwant message triggers handlers.onunwant(channel, message)

#### p.request(channel, message)

Send a request message on a channel.

Receiving a request message triggers handlers.onrequest(channel, message)

#### p.cancel(channel, message)

Send a cancel message on a channel.

Receiving a cancel message triggers handlers.oncancel(channel, message)

#### p.data(channel, message)

Send a data message on a channel.

Receiving a data message triggers handlers.ondata(channel, message)

#### keyPair = Protocol.keyPair([seed])`

Static function to generate a Noise key pair, optionally from a seed.

License

MIT