@dazaar/payment-lightning

Lightning payment api for Dazaar stream services

Usage

Options

const lightningOpts = {
  cert: ..., // base64 encoded string of tls.cert
  macaroon: ..., // base64 encoded string of macaroon
  network: ..., // mainnet / testnet / regtest
  host: ..., // <host>:<port>
  oninvoice: function (invoice) {
    // handle incoming invoice, e.g. display as QR
  }
}

const paymentCard = {
  method: 'Lightning',
  currency: 'BTC', // may also be LightningSats
  amount: '0.002',
  unit: 'hours',
  interval: 1,
  minSeconds: 1, // minimum amount of streamtime
}

Seller

const Payment = require('@dazaar/payment-lightning')
const market = require('dazaar')
const hypercore = require('hypercore')

const m = market('./tmp')
const feed = hypercore('./tmp/data')

let payment

// instantiate a seller for a feed and equip it
// with a validate function
const seller = m.sell(feed, {
  validate (remoteKey, cb) {
    payee.validate(remoteKey, cb)
  }
})

seller.ready(function (err) {
  payment = new Payment(seller, paymentCard, lightningOpts)
  
  // payment now set up. dazaar logic follows ... 
})

Buyer

On a separate machine with the

// instantiate a buyer for a specific feed 
const buyer = m.buy(seller.key)

// set up pay payment linked to the buyer
const payment = new Payment(buyer, null, lightningOpts)

// buy an amount of feed
payment.buy(800) // oninvoice handles response

API

const payment = Payment(seller, payment, options)

Create a new lightning payment instance associated to a seller. seller should be a dazaar seller instance, payment may either be a dazaar payment card, or a string specifying the per second rate in either BTC or Sats, such as 200 Sats/s. Options include:

{
  cert: ..., // base64 encoded string of tls.cert
  macaroon: ..., // base64 encoded string of macaroon
  network: ..., // mainnet / testnet / regtest
  implementation: ..., // 'c-lightning' or 'lnd'
  oninvoice: function (invoice) {
    // handle incoming invoice, e.g. display as QR
  }
}

payment.validate(buyerKey, cb)

A seller can validate the time left for a given buyer. Returns error if there is no time left on the subscription. The method shall check whether the given buyer has a subscription set-up and instantiate one not already present.

payment.requestInvoice(amount, cb)

Request a specified amount for the stream that this buyer is registered to. amount is specified in satoshis (1 x 10^-8 BTC). The invoice is passed to the user so there is no need for a lightning node to be connected in order to call this API. oninvoice handles the returned invoice, which is passed to the constructor.

payment.sell(request, buyerKey, cb)

Serve an invoice for a given request. For this to be called it is required that a lightning node is connected with at least invoice.macaroon provided.

payment.buy(seller, amount, auth,cb)

seller and auth should be passed as null. Request an invoice and pay it upon receipt. For this to be called it is required that a lightning node is connected with admin.macaroon provided.

payment.destroy()

Destroy the payment provider

Setup

Refer to the setup guide for instructions on how to install a lightning node implementation and set up a test environment.

License

MIT