137 lines
4.2 KiB
TypeScript
137 lines
4.2 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 bs58check = require('bs58check')
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// input: {signature} {pubkey}
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// output: OP_DUP OP_HASH160 {hash160(pubkey)} OP_EQUALVERIFY OP_CHECKSIG
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export function p2pkh (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.input
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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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network: typef.maybe(typef.Object),
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address: typef.maybe(typef.String),
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hash: typef.maybe(typef.BufferN(20)),
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output: typef.maybe(typef.BufferN(25)),
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pubkey: typef.maybe(ecc.isPoint),
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signature: typef.maybe(bscript.isCanonicalScriptSignature),
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input: typef.maybe(typef.Buffer)
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}, a)
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const _address = lazy.value(function () {
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const payload = bs58check.decode(a.address)
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const version = payload.readUInt8(0)
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const hash = payload.slice(1)
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return { version, hash }
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})
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const _chunks = <()=>Array<Buffer | number>>lazy.value(function () { return bscript.decompile(a.input!) })
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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 payload = Buffer.allocUnsafe(21)
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payload.writeUInt8(network.pubKeyHash, 0)
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o.hash.copy(payload, 1)
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return bs58check.encode(payload)
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})
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lazy.prop(o, 'hash', function () {
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if (a.output) return a.output.slice(3, 23)
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if (a.address) return _address().hash
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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_DUP,
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OPS.OP_HASH160,
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o.hash,
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OPS.OP_EQUALVERIFY,
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OPS.OP_CHECKSIG
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])
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})
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lazy.prop(o, 'pubkey', function () {
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if (!a.input) return
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return <Buffer>_chunks()[1]
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})
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lazy.prop(o, 'signature', function () {
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if (!a.input) return
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return <Buffer>_chunks()[0]
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})
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lazy.prop(o, 'input', function () {
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if (!a.pubkey) return
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if (!a.signature) return
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return bscript.compile([a.signature, a.pubkey])
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})
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lazy.prop(o, 'witness', function () {
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if (!o.input) return
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return []
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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 (_address().version !== network.pubKeyHash) throw new TypeError('Invalid version or Network mismatch')
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if (_address().hash.length !== 20) throw new TypeError('Invalid address')
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hash = _address().hash
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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 !== 25 ||
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a.output[0] !== OPS.OP_DUP ||
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a.output[1] !== OPS.OP_HASH160 ||
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a.output[2] !== 0x14 ||
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a.output[23] !== OPS.OP_EQUALVERIFY ||
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a.output[24] !== OPS.OP_CHECKSIG) throw new TypeError('Output is invalid')
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const hash2 = a.output.slice(3, 23)
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if (hash.length > 0 && !hash.equals(hash2)) throw new TypeError('Hash mismatch')
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else hash = hash2
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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.input) {
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const chunks = _chunks()
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if (chunks.length !== 2) throw new TypeError('Input is invalid')
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if (!bscript.isCanonicalScriptSignature(<Buffer>chunks[0])) throw new TypeError('Input has invalid signature')
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if (!ecc.isPoint(chunks[1])) throw new TypeError('Input has invalid pubkey')
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if (a.signature && !a.signature.equals(<Buffer>chunks[0])) throw new TypeError('Signature mismatch')
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if (a.pubkey && !a.pubkey.equals(<Buffer>chunks[1])) throw new TypeError('Pubkey mismatch')
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const pkh = bcrypto.hash160(<Buffer>chunks[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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