135 lines
4.1 KiB
TypeScript
135 lines
4.1 KiB
TypeScript
import { Payment, PaymentOpts } from './index' // eslint-disable-line
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import * as bscript from '../script'
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import * as bcrypto from '../crypto'
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import * as lazy from './lazy'
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import { bitcoin as BITCOIN_NETWORK } from '../networks'
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const typef = require('typeforce')
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const OPS = bscript.OPS
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const ecc = require('tiny-secp256k1')
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const bech32 = require('bech32')
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const EMPTY_BUFFER = Buffer.alloc(0)
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// witness: {signature} {pubKey}
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// input: <>
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// output: OP_0 {pubKeyHash}
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export function p2wpkh (a: Payment, opts?: PaymentOpts): Payment {
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if (
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!a.address &&
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!a.hash &&
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!a.output &&
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!a.pubkey &&
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!a.witness
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) throw new TypeError('Not enough data')
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opts = Object.assign({ validate: true }, opts || {})
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typef({
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address: typef.maybe(typef.String),
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hash: typef.maybe(typef.BufferN(20)),
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input: typef.maybe(typef.BufferN(0)),
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network: typef.maybe(typef.Object),
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output: typef.maybe(typef.BufferN(22)),
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pubkey: typef.maybe(ecc.isPoint),
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signature: typef.maybe(bscript.isCanonicalScriptSignature),
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witness: typef.maybe(typef.arrayOf(typef.Buffer))
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}, a)
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const _address = lazy.value(function () {
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const result = bech32.decode(a.address)
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const version = result.words.shift()
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const data = bech32.fromWords(result.words)
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return {
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version,
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prefix: result.prefix,
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data: Buffer.from(data)
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}
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})
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const network = a.network || BITCOIN_NETWORK
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const o: Payment = { network }
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lazy.prop(o, 'address', function () {
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if (!o.hash) return
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const words = bech32.toWords(o.hash)
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words.unshift(0x00)
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return bech32.encode(network.bech32, words)
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})
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lazy.prop(o, 'hash', function () {
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if (a.output) return a.output.slice(2, 22)
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if (a.address) return _address().data
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if (a.pubkey || o.pubkey) return bcrypto.hash160(a.pubkey! || o.pubkey!)
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})
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lazy.prop(o, 'output', function () {
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if (!o.hash) return
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return bscript.compile([
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OPS.OP_0,
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o.hash
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])
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})
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lazy.prop(o, 'pubkey', function () {
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if (a.pubkey) return a.pubkey
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if (!a.witness) return
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return a.witness[1]
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})
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lazy.prop(o, 'signature', function () {
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if (!a.witness) return
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return a.witness[0]
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})
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lazy.prop(o, 'input', function () {
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if (!o.witness) return
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return EMPTY_BUFFER
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})
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lazy.prop(o, 'witness', function () {
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if (!a.pubkey) return
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if (!a.signature) return
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return [a.signature, a.pubkey]
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})
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// extended validation
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if (opts.validate) {
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let hash: Buffer = Buffer.from([])
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if (a.address) {
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if (network && network.bech32 !== _address().prefix) throw new TypeError('Invalid prefix or Network mismatch')
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if (_address().version !== 0x00) throw new TypeError('Invalid address version')
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if (_address().data.length !== 20) throw new TypeError('Invalid address data')
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hash = _address().data
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}
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if (a.hash) {
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if (hash.length > 0 && !hash.equals(a.hash)) throw new TypeError('Hash mismatch')
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else hash = a.hash
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}
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if (a.output) {
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if (
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a.output.length !== 22 ||
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a.output[0] !== OPS.OP_0 ||
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a.output[1] !== 0x14) throw new TypeError('Output is invalid')
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if (hash.length > 0 && !hash.equals(a.output.slice(2))) throw new TypeError('Hash mismatch')
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else hash = a.output.slice(2)
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}
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if (a.pubkey) {
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const pkh = bcrypto.hash160(a.pubkey)
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if (hash.length > 0 && !hash.equals(pkh)) throw new TypeError('Hash mismatch')
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else hash = pkh
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}
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if (a.witness) {
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if (a.witness.length !== 2) throw new TypeError('Witness is invalid')
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if (!bscript.isCanonicalScriptSignature(a.witness[0])) throw new TypeError('Witness has invalid signature')
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if (!ecc.isPoint(a.witness[1])) throw new TypeError('Witness has invalid pubkey')
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if (a.signature && !a.signature.equals(a.witness[0])) throw new TypeError('Signature mismatch')
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if (a.pubkey && !a.pubkey.equals(a.witness[1])) throw new TypeError('Pubkey mismatch')
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const pkh = bcrypto.hash160(a.witness[1])
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if (hash.length > 0 && !hash.equals(pkh)) throw new TypeError('Hash mismatch')
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}
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}
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return Object.assign(o, a)
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}
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