Eth Keyring Controller

Warning

This package has been merged into @metamask/keyring-controller. This repository is no longer in use, and pull requests will no longer be accepted.

A module for managing groups of Ethereum accounts called "Keyrings", defined originally for MetaMask's multiple-account-type feature.

To add new account types to a KeyringController, just make sure it follows The Keyring Class Protocol.

The KeyringController has three main responsibilities:

Initializing & using (signing with) groups of Ethereum accounts ("keyrings").
Keeping track of local nicknames for those individual accounts.
Providing password-encryption persisting & restoring of secret information.

Installation

yarn add @metamask/eth-keyring-controller

This library uses the Node.js events API. If you are using this library outside of a Node.js context, ensure that you have a polyfill for the events API (this is built-in to browserify).

Usage

const { KeyringController } = require('@metamask/eth-keyring-controller');
const SimpleKeyring = require('@metamask/eth-simple-keyring');

const keyringController = new KeyringController({
  keyringTypes: [SimpleKeyring], // optional array of types to support.
  initState: initState.KeyringController, // Last emitted persisted state.
  encryptor: {
    // An optional object for defining encryption schemes:
    // Defaults to Browser-native SubtleCrypto.
    encrypt(password, object) {
      return new Promise('encrypted!');
    },
    decrypt(password, encryptedString) {
      return new Promise({ foo: 'bar' });
    },
  },
});

// The KeyringController is also an event emitter:
this.keyringController.on('newAccount', (address) => {
  console.log(`New account created: ${address}`);
});
this.keyringController.on('removedAccount', handleThat);

Methods

Currently the methods are heavily commented in the source code, so it's the best place to look until we aggregate it here as well.

Contributing

Setup

Install Node.js version 18
- If you are using nvm (recommended) running nvm use will automatically choose the right node version for you.
Install Yarn v3
Run yarn install to install dependencies and run any required post-install scripts

Testing and Linting

Run yarn test to run the tests once.

Run yarn lint to run the linter, or run yarn lint:fix to run the linter and fix any automatically fixable issues.

Release & Publishing

The project follows the same release process as the other libraries in the MetaMask organization. The GitHub Actions action-create-release-pr and action-publish-release are used to automate the release process; see those repositories for more information about how they work.

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License

MetaMask/KeyringController

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