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• [FILE] descriptor.ts
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Просмотр файла: descriptor.ts

import { BIP32Interface } from '@bitgo/utxo-lib';
import { ast } from '@bitgo/wasm-miniscript';

/**
 * Script type for a descriptor.
 *
 * See https://docs.coredao.org/docs/Learn/products/btc-staking/design#p2shp2wsh-output
 */
export type ScriptType = 'sh' | 'sh-wsh' | 'wsh';

function asDescriptorKey(key: BIP32Interface | Buffer, neutered: boolean): string {
  if (Buffer.isBuffer(key)) {
    return key.toString('hex');
  }
  return (neutered ? key.neutered() : key).toBase58() + '/*';
}

/**
 * Create a multi-sig descriptor to produce a coredao staking address
 * @param scriptType segwit or legacy
 * @param locktime locktime for CLTV
 * @param m Total number of keys required to unlock
 * @param orderedKeys If Bip32Interfaces, these are xprvs or xpubs and are derivable.
 *                    If they are buffers, then they are pub/prv keys and are not derivable.
 * @param neutered If true, neuter the keys. Default to true
 */
export function createMultiSigDescriptor(
  scriptType: ScriptType,
  locktime: number,
  m: number,
  orderedKeys: (BIP32Interface | Buffer)[],
  neutered = true
): string {
  if (m > orderedKeys.length || m < 1) {
    throw new Error(
      `m (${m}) must be less than or equal to the number of keys (${orderedKeys.length}) and greater than 0`
    );
  }
  if (locktime <= 0) {
    throw new Error(`locktime (${locktime}) must be greater than 0`);
  }
  const keys = orderedKeys.map((key) => asDescriptorKey(key, neutered));
  const inner: ast.MiniscriptNode = { and_v: [{ 'r:after': locktime }, { multi: [m, ...keys] }] };
  switch (scriptType) {
    case 'sh':
      return ast.formatNode({ sh: inner });
    case 'sh-wsh':
      return ast.formatNode({ sh: { wsh: inner } });
    case 'wsh':
      return ast.formatNode({ wsh: inner });
  }
}

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