bitcoinjs-lib/test/payments.utils.js

const t = require('assert')
const bscript = require('../dist/src/script')
const BNETWORKS = require('../dist/src/networks')

function tryHex (x) {
  if (Buffer.isBuffer(x)) return x.toString('hex')
  if (Array.isArray(x)) return x.map(tryHex)
  return x
}

function fromHex (x) {
  if (typeof x === 'string') return Buffer.from(x, 'hex')
  if (Array.isArray(x)) return x.map(fromHex)
  return x
}
function tryASM (x) {
  if (Buffer.isBuffer(x)) return bscript.toASM(x)
  return x
}
function asmToBuffer (x) {
  if (x === '') return Buffer.alloc(0)
  return bscript.fromASM(x)
}
function carryOver (a, b) {
  for (let k in b) {
    if (k in a && k === 'redeem') {
      carryOver(a[k], b[k])
      continue
    }

    // don't, the value was specified
    if (k in a) continue

    // otherwise, expect match
    a[k] = b[k]
  }
}

function equateBase (a, b, context) {
  if ('output' in b) t.strictEqual(tryASM(a.output), tryASM(b.output), `Inequal ${context}output`)
  if ('input' in b) t.strictEqual(tryASM(a.input), tryASM(b.input), `Inequal ${context}input`)
  if ('witness' in b) t.deepEqual(tryHex(a.witness), tryHex(b.witness), `Inequal ${context}witness`)
}

function equate (a, b, args) {
  b = Object.assign({}, b)
  carryOver(b, args)

  // by null, we mean 'undefined', but JSON
  if (b.input === null) b.input = undefined
  if (b.output === null) b.output = undefined
  if (b.witness === null) b.witness = undefined
  if (b.redeem) {
    if (b.redeem.input === null) b.redeem.input = undefined
    if (b.redeem.output === null) b.redeem.output = undefined
    if (b.redeem.witness === null) b.redeem.witness = undefined
  }

  equateBase(a, b, '')
  if (b.redeem) equateBase(a.redeem, b.redeem, 'redeem.')
  if (b.network) t.deepEqual(a.network, BNETWORKS[b.network], 'Inequal *.network')

  // contextual
  if (b.signature === null) b.signature = undefined
  if ('address' in b) t.strictEqual(a.address, b.address, 'Inequal *.address')
  if ('hash' in b) t.strictEqual(tryHex(a.hash), tryHex(b.hash), 'Inequal *.hash')
  if ('pubkey' in b) t.strictEqual(tryHex(a.pubkey), tryHex(b.pubkey), 'Inequal *.pubkey')
  if ('signature' in b) t.strictEqual(tryHex(a.signature), tryHex(b.signature), 'Inequal signature')
  if ('m' in b) t.strictEqual(a.m, b.m, 'Inequal *.m')
  if ('n' in b) t.strictEqual(a.n, b.n, 'Inequal *.n')
  if ('pubkeys' in b) t.deepEqual(tryHex(a.pubkeys), tryHex(b.pubkeys), 'Inequal *.pubkeys')
  if ('signatures' in b) t.deepEqual(tryHex(a.signatures), tryHex(b.signatures), 'Inequal *.signatures')
  if ('data' in b) t.deepEqual(tryHex(a.data), tryHex(b.data), 'Inequal *.data')
}

function preform (x) {
  x = Object.assign({}, x)

  if (x.network) x.network = BNETWORKS[x.network]
  if (typeof x.inputHex === 'string') {
    x.input = Buffer.from(x.inputHex, 'hex')
    delete x.inputHex
  }
  if (typeof x.outputHex === 'string') {
    x.output = Buffer.from(x.outputHex, 'hex')
    delete x.outputHex
  }
  if (typeof x.output === 'string') x.output = asmToBuffer(x.output)
  if (typeof x.input === 'string') x.input = asmToBuffer(x.input)
  if (Array.isArray(x.witness)) x.witness = x.witness.map(fromHex)

  if (x.data) x.data = x.data.map(fromHex)
  if (x.hash) x.hash = Buffer.from(x.hash, 'hex')
  if (x.pubkey) x.pubkey = Buffer.from(x.pubkey, 'hex')
  if (x.signature) x.signature = Buffer.from(x.signature, 'hex')
  if (x.pubkeys) x.pubkeys = x.pubkeys.map(fromHex)
  if (x.signatures) x.signatures = x.signatures.map(function (y) { return Number.isFinite(y) ? y : Buffer.from(y, 'hex') })
  if (x.redeem) {
    x.redeem = Object.assign({}, x.redeem)
    if (typeof x.redeem.input === 'string') x.redeem.input = asmToBuffer(x.redeem.input)
    if (typeof x.redeem.output === 'string') x.redeem.output = asmToBuffer(x.redeem.output)
    if (Array.isArray(x.redeem.witness)) x.redeem.witness = x.redeem.witness.map(fromHex)
    if (x.redeem.network) x.redeem.network = BNETWORKS[x.redeem.network]
  }

  return x
}

function from (path, object, result) {
  path = path.split('.')
  result = result || {}

  let r = result
  path.forEach((k, i) => {
    if (i < path.length - 1) {
      r[k] = r[k] || {}

      // recurse
      r = r[k]
      object = object[k]
    } else {
      r[k] = object[k]
    }
  })

  return result
}

module.exports = {
  from,
  equate,
  preform
}