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src/services/signers/ledgerSigner.js

import { CLPublicKey, DeployUtil } from 'casper-js-sdk';
import SignError from '../errors/signError';
import AbstractSigner from './abstractSigner';

/**
 * LedgerSigner class
 * Used to sign a deployment with Ledger
 */
export default class LedgerSigner extends AbstractSigner {
  /**
   * Sign a given Deploy Object with the corresponding public key.
   * You must pass the active public key from the user and the public key where the deploy is going to be used.
   *
   * @param {DeployUtil.Deploy} deploy - Deploy object
   * @param {Object} options - Options object
   * @param {CasperApp} options.app - CasperApp instance.
   * @param {string} options.publicKey - Public key that sign the deploy.
   * @param {string} options.keyPath - Public key that sign the deploy.
   * @returns {Promise<DeployUtil.Deploy>} - Signed deploy object
   */
  static async sign(deploy, options = {}) {
    try {
      const responseDeploy = await options.app.sign(
        `m/44'/506'/0'/0/${options.keyPath}`,
        DeployUtil.deployToBytes(deploy),
      );
      let signedDeploy = DeployUtil.setSignature(
        deploy,
        responseDeploy.signatureRS,
        CLPublicKey.fromHex(options.publicKey),
      );
      signedDeploy = DeployUtil.validateDeploy(signedDeploy);
      if (signedDeploy.ok) {
        return signedDeploy.val;
      }
      throw signedDeploy.val;
    } catch (e) {
      // eslint-disable-next-line no-console
      console.log(e);
      throw new SignError();
    }
  }
}