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: 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 = (): string => {
  return 'witnessScriptHash input';
};