bitcoinjs-lib/test/integration/payments.js

const bitcoin = require('../../')

const { describe, it } = require('mocha')
const regtestUtils = require('./_regtest')
const NETWORK = regtestUtils.network
const keyPairs = [
  bitcoin.ECPair.makeRandom({ network: NETWORK }),
  bitcoin.ECPair.makeRandom({ network: NETWORK })
]

async function buildAndSign (depends, prevOutput, redeemScript, witnessScript) {
  const unspent = await regtestUtils.faucetComplex(prevOutput, 5e4)

  const txb = new bitcoin.TransactionBuilder(NETWORK)
  txb.addInput(unspent.txId, unspent.vout, null, prevOutput)
  txb.addOutput(regtestUtils.RANDOM_ADDRESS, 2e4)

  const posType = depends.prevOutScriptType
  const needsValue = !!witnessScript || posType.slice(-6) === 'p2wpkh'

  if (depends.signatures) {
    keyPairs.forEach(keyPair => {
      txb.sign({
        prevOutScriptType: posType,
        vin: 0,
        keyPair,
        redeemScript,
        witnessValue: needsValue ? unspent.value : undefined,
        witnessScript,
      })
    })
  } else if (depends.signature) {
    txb.sign({
      prevOutScriptType: posType,
      vin: 0,
      keyPair: keyPairs[0],
      redeemScript,
      witnessValue: needsValue ? unspent.value : undefined,
      witnessScript,
    })
  }

  return regtestUtils.broadcast(txb.build().toHex())
}

;['p2ms', 'p2pk', 'p2pkh', 'p2wpkh'].forEach(k => {
  const fixtures = require('../fixtures/' + k)
  const { depends } = fixtures.dynamic
  const fn = bitcoin.payments[k]

  const base = {}
  if (depends.pubkey) base.pubkey = keyPairs[0].publicKey
  if (depends.pubkeys) base.pubkeys = keyPairs.map(x => x.publicKey)
  if (depends.m) base.m = base.pubkeys.length

  const { output } = fn(base)
  if (!output) throw new TypeError('Missing output')

  describe('bitcoinjs-lib (payments - ' + k + ')', () => {
    it('can broadcast as an output, and be spent as an input', async () => {
      Object.assign(depends, { prevOutScriptType: k })
      await buildAndSign(depends, output, undefined, undefined)
    })

    it('can (as P2SH(' + k + ')) broadcast as an output, and be spent as an input', async () => {
      const p2sh = bitcoin.payments.p2sh({ redeem: { output }, network: NETWORK })
      Object.assign(depends, { prevOutScriptType: 'p2sh-' + k })
      await buildAndSign(depends, p2sh.output, p2sh.redeem.output, undefined)
    })

    // NOTE: P2WPKH cannot be wrapped in P2WSH, consensus fail
    if (k === 'p2wpkh') return

    it('can (as P2WSH(' + k + ')) broadcast as an output, and be spent as an input', async () => {
      const p2wsh = bitcoin.payments.p2wsh({ redeem: { output }, network: NETWORK })
      Object.assign(depends, { prevOutScriptType: 'p2wsh-' + k })
      await buildAndSign(depends, p2wsh.output, undefined, p2wsh.redeem.output)
    })

    it('can (as P2SH(P2WSH(' + k + '))) broadcast as an output, and be spent as an input', async () => {
      const p2wsh = bitcoin.payments.p2wsh({ redeem: { output }, network: NETWORK })
      const p2sh = bitcoin.payments.p2sh({ redeem: { output: p2wsh.output }, network: NETWORK })

      Object.assign(depends, { prevOutScriptType: 'p2sh-p2wsh-' + k })
      await buildAndSign(depends, p2sh.output, p2sh.redeem.output, p2wsh.redeem.output)
    })
  })
})