chainscript/lib/utils/hashFile.js

Client for chainscript.io

'use strict';

exports.__esModule = true;
exports['default'] = hashFile;

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }

var _fs = require('fs');

var _fs2 = _interopRequireDefault(_fs);

var _crypto = require('crypto');

var _crypto2 = _interopRequireDefault(_crypto);

var _multihashes = require('multihashes');

var _multihashes2 = _interopRequireDefault(_multihashes);

var _bs58 = require('bs58');

var _bs582 = _interopRequireDefault(_bs58);

var HASH_MAP = {
  sha1: 'sha1',
  sha256: 'sha2-256',
  sha512: 'sha2-512'
};

exports.HASH_MAP = HASH_MAP;

function hashFile(input, algorithm) {
  return new Promise(function (resolve, reject) {
    var algorithmName = HASH_MAP[algorithm];

    if (typeof algorithmName === 'undefined') {
      throw new Error('Unsupported algorithm: ' + algorithm);
    }

    var hash = _crypto2['default'].createHash(algorithm);
    var reader = typeof input === 'string' ? _fs2['default'].createReadStream(input) : input;

    reader.on('error', reject);

    reader.on('data', function (data) {
      return hash.update(data);
    });

    reader.on('end', function () {
      var res = _bs582['default'].encode(_multihashes2['default'].encode(hash.digest(), algorithmName));
      resolve(res);
    });
  });
}