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

// OP_0 [signatures ...]

import * as bscript from '../../script'
import { OPS } from '../../script'

function partialSignature (value: number | Buffer): boolean {
  return value === OPS.OP_0 || bscript.isCanonicalScriptSignature(<Buffer>value)
}

export function check (script: Buffer | Array<number | Buffer>, allowIncomplete?: boolean): boolean {
  const chunks = <Array<number | Buffer>>bscript.decompile(script)
  if (chunks.length < 2) return false
  if (chunks[0] !== OPS.OP_0) return false

  if (allowIncomplete) {
    return chunks.slice(1).every(partialSignature)
  }

  return (<Array<Buffer>>chunks.slice(1)).every(bscript.isCanonicalScriptSignature)
}
check.toJSON = function () { return 'multisig input' }