spacylabs-rhino/src/lib/stark/ledger/getPublicKey.js

const Eth = require('@ledgerhq/hw-app-eth').default
const selectTransport = require('../../ledger/selectTransport')

module.exports = async (dvf, path) => {
  const Transport = selectTransport(dvf.isBrowser)
  let transport
  try {
    transport = await Transport.create()
    const eth = new Eth(transport)
    const { address } = await eth.getAddress(path)
    const starkPath = dvf.stark.ledger.getPath(address)
    const tempKey = (await eth.starkGetPublicKey(starkPath)).toString('hex')
    const starkPublicKey = {
      x: tempKey.substr(2, 64),
      y: tempKey.substr(66)
    }
    await transport.close()
    return dvf.stark.formatStarkPublicKey(starkPublicKey)
  } catch (error) {
    if (transport) {
      await transport.close()
    }
    throw error
  }
}