@dazaar/payment-eth

Ethereum payment api for Dazaar stream services

Usage

const PaymentETH = require('@dazaar/payment-eth')
const market = require('dazaar/market')
const Index = require('@hyperdivision/eth-transaction-indexer')
const hypercore = require('hypercore')

const index = new Index(hypercore('./tmp/db'), {
  endpoint: 'https://infura...'
})

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

const paymentCard = {
  id: 'dazaartest22',
  payment: [{
    method: 'ETH',
    pubKey: '0x50c7d91e74b0e42bd8bce8ad6d199e4a23c0b193',
    currency: 'microether',
    amount: 1,
    unit: 'seconds',
    interval: 1
  }]
}

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 now set up. dazaar logic follows ...
  payment = new PaymentETH(seller, paymentCard, index)
})

Buyer

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

// generate the ethereum adress to pay to for a given stream
const payTo = PaymentETH.tweak(buyer.key, dazaarCard, 'microether')

// pay the desired amount to the address generated

API

const payment = PaymentETH(seller, payment, index)

Create a new eth 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 ETH, such as 0.0002 ETH/s. index should be a transaction indexer

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.buyers([privateKey], cb)

Generate a list of all the buyers with their tweaked accounts they paid to. If you private the private key you get the tweaked private keys out as well, meaning you can sweep the accounts to somewhere yourself.

The result looks like this:

[{
  buyer: <buyer-pub-key>,
  uniqueFeed: <keypair of the hypercore generate for them>,
  eth: <the eth account tweaked for the buyer>
}, ...]

const payTo = PaymentETH.tweak(buyerKey, dazaarCard, [paymentType])

Static method to generate the ETH address to pay to for a given stream. buyerKey is the buyer's dazaar key and dazaarCard give the relevant stream details.

License

MIT