identifi-lib/cjs/key.js

Basic tools for reading and writing Identifi messages and identities.

'use strict';

exports.__esModule = true;

var _util = require('./util');

var _util2 = _interopRequireDefault(_util);

var _gun = require('gun');

var _gun2 = _interopRequireDefault(_gun);

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

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } } /*eslint no-useless-escape: "off", camelcase: "off" */

var myKey = void 0;

/**
* Key management utils
*/

var Key = function () {
  function Key() {
    _classCallCheck(this, Key);
  }

  /**
  * Load default key from datadir/private.key on node.js or from local storage 'identifi.myKey' in browser.
  *
  * If default key does not exist, it is generated.
  * @param {string} datadir directory to find key from. In browser, localStorage is used instead.
  * @returns {Promise(Object)} keypair object
  */
  Key.getDefault = async function getDefault() {
    var datadir = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : '.';

    if (myKey) {
      return myKey;
    }
    if (_util2.default.isNode) {
      var fs = require('fs');
      var privKeyFile = datadir + '/private.key';
      if (fs.existsSync(privKeyFile)) {
        var f = fs.readFileSync(privKeyFile, 'utf8');
        myKey = Key.fromJwk(f);
      } else {
        myKey = await Key.generate();
        fs.writeFileSync(privKeyFile, Key.toJwk(myKey));
        fs.chmodSync(privKeyFile, 400);
      }
      if (!myKey) {
        throw new Error('loading default key failed - check ' + datadir + '/private.key');
      }
    } else {
      var jwk = window.localStorage.getItem('identifi.myKey');
      if (jwk) {
        myKey = Key.fromJwk(jwk);
      } else {
        myKey = await Key.generate();
        window.localStorage.setItem('identifi.myKey', Key.toJwk(myKey));
      }
      if (!myKey) {
        throw new Error('loading default key failed - check localStorage identifi.myKey');
      }
    }
    return myKey;
  };

  /**
  * Serialize key as JSON Web key
  * @param {Object} key key to serialize
  * @returns {String} JSON Web Key string
  */


  Key.toJwk = function toJwk(key) {
    return JSON.stringify(key);
  };

  /**
  * Get keyID
  * @param {Object} key key to get an id for. Currently just returns the public key string.
  * @returns {String} JSON Web Key string
  */


  Key.getId = function getId(key) {
    if (!(key && key.pub)) {
      throw new Error('missing param');
    }
    return key.pub; // hack until GUN supports lookups by keyID
    //return util.getHash(key.pub);
  };

  /**
  * Get a keypair from a JSON Web Key object.
  * @param {Object} jwk JSON Web Key
  * @returns {String}
  */


  Key.fromJwk = function fromJwk(jwk) {
    return JSON.parse(jwk);
  };

  /**
  * Generate a new keypair
  * @returns {Promise(Object)} Gun.SEA keypair object
  */


  Key.generate = function generate() {
    return _gun2.default.SEA.pair();
  };

  /**
  * Sign a message
  * @param {String} msg message to sign
  * @param {Object} pair signing keypair
  * @returns {Promise(String)} signed message string
  */


  Key.sign = async function sign(msg, pair) {
    var sig = await _gun2.default.SEA.sign(msg, pair);
    return 'a' + sig;
  };

  /**
  * Verify a signed message
  * @param {String} msg message to verify
  * @param {Object} pubKey public key of the signer
  * @returns {Promise(String)} signature string
  */


  Key.verify = function verify(msg, pubKey) {
    return _gun2.default.SEA.verify(msg.slice(1), pubKey);
  };

  return Key;
}();

exports.default = Key;
module.exports = exports['default'];