bitcoinjs-lib/ts_src/templates/witnessscripthash/input.ts

// <scriptSig> {serialized scriptPubKey script}

import * as bscript from '../../script'
const typeforce = require('typeforce')

import * as p2ms from '../multisig'
import * as p2pk from '../pubkey'
import * as p2pkh from '../pubkeyhash'

export function check (chunks: Array<Buffer>, allowIncomplete?: boolean): boolean {
  typeforce(typeforce.Array, chunks)
  if (chunks.length < 1) return false

  const witnessScript = chunks[chunks.length - 1]
  if (!Buffer.isBuffer(witnessScript)) return false

  const witnessScriptChunks = bscript.decompile(witnessScript)

  // is witnessScript a valid script?
  if (!witnessScriptChunks || witnessScriptChunks.length === 0) return false

  const witnessRawScriptSig = bscript.compile(chunks.slice(0, -1))

  // match types
  if (p2pkh.input.check(witnessRawScriptSig) &&
    p2pkh.output.check(witnessScriptChunks)) return true

  if (p2ms.input.check(witnessRawScriptSig, allowIncomplete) &&
    p2ms.output.check(witnessScriptChunks)) return true

  if (p2pk.input.check(witnessRawScriptSig) &&
    p2pk.output.check(witnessScriptChunks)) return true

  return false
}
check.toJSON = function () { return 'witnessScriptHash input' }