@silencelaboratories/walletprovider-sdk

walletprovider-sdk

The frontend library for Silent Network.

Demo

Under the demo directory we provide the sample webpage that shows example usage of the library. In order to run it execute the following:

1. Build the library

bun install
bun run build

1. Run the demo

cd demo
npm install
npm run dev

The demo fetches configuration from the .env file. We provided example .env here.

The demo communicates with backend service. Run it before using the demo page.

Using the library

The library is published on npmjs registry.

Install it in your project as usual:

npm i @silencelaboratories/walletprovider-sdk

The backend

The library communicates with backend service. The example implementation of such service is accessible here. Please refer to backend documentation in order to run the service.

Frontend uses WalletProviderServiceClient object in order to connect to the backend and send requests.

Documentation

For description of classes, interfaces, types, please refer to documentation.

Authentication

Users authenticate using an EOA wallet during key generation and register an ephemeral signing key pair and associates it with their identity.

Frontend can later use the ephemeral signing key pair to authorize signing requests for duration of the session without the need for repeated user interaction, providing a seamless and secure authentication mechanism.

We use EOAAuth to authenticate the user during keygen. The EOAAuth object is created with the user's wallet address, ephemeral public key, and lifetime of the key in seconds.

We then use EphAuth to authenticate the user during signing. The EphAuth object is created with the user's wallet address and ephemeral keypair.

Keygen

The full working example is in the demo. The core object to use is the NetworkSigner.

It allows to generate keys and do signatures. In order to create, you need two other components. The WalletProviderServiceClient that connects to the Backend part of the SDK, and the authentication module. Currently we provide EOA authentication via EOAAuth.

Let's create the NetworkSigner

// Generate ephemeral secret key esk
const sk = ed.utils.randomPrivateKey();
ephSK = sk;
// Derive public part epk from esk
ephPK = await ed.getPublicKeyAsync(sk);

// Create a client that connects to the backend service
const wpClient = await createWalletProviderService(clusterConfig);

// Create EOA authenticator, signature will include epk
const eoaAuth = new EOAAuth(
  accountsFromBrowserWallet[0],
  new BrowserWallet(),
  ephPK,
  // Lifetime of one hour
  60 * 60,
);

// Create a new signer instance
const sdk = new NetworkSigner(wpClient, threshold, partiesNumber, eoaAuth);

Now you can generate a key, using the authenticateAndCreateKey method. The method accepts optional permissions. No permissions means allow all operations.

const permissions = {
  permissions: [
    {
      type: 'erc20',
      method: 'approve',
      to: '0x1234567890123456789012345678901234567890',
      args: {
        spender: '0x1234567890123456789012345678901234567890',
        value: 10000,
        eq: '<',
      },
    },
  ],
};

// Generate a new key
let resp: KeygenResponse = await sdk.authenticateAndCreateKey(JSON.stringify(permissions));

Calling this method will cause to the Browser Wallet window to pop up, requesting the User to sign the request. After execution KeygenResponse is returned.

The KeygenResponse contains keyId and publicKey. The publicKey is the public part of the key generated by Silent Network. Use the keyId in subsequent calls to sign.

The esk key can be later used by the frontend in subsequent signgen requests for authenticating.

Signing

The full signing example is here.

Let's create NetworkSigner for signing. Note the EphAuth is used to avoid user interaction when generating the signatures.

const authModule = new EphAuth(accountsFromBrowserWallet[0], ephSK!);
// Create a new signer instance
const sdk = new NetworkSigner(wpClient, threshold, partiesNumber, authModule);

Use the NetworkSigner.authenticateAndSign method in order to generate a signature.

let signMessage = JSON.stringify({
  userOperation: {
    sender: '0x8d4cb2540d993fe34c646299f1ab4af3012ff34c',
    nonce: '0x7',
    initCode: '',
    callData: '0000189a...',
    callGasLimit: '123130',
    verificationGasLimit: '153427',
    preVerificationGas: '66768',
    maxFeePerGas: '',
    maxPriorityFeePerGas: '',
    paymasterAndData: '',
  },
  entryPointVersion: 'v0.6.0',
  entryPointAddress: '0x5FF137D4b0FDCD49DcA30c7CF57E578a026d2789',
  chainId: 80002,
});

let resp = await sdk.authenticateAndSign(selectedKeyId, signMessage);

The SignResponse contains the signature sign and the recovery ID recid.

Developing the library

Audience of this section are library developers.

Bun runtime is required

Install bun from https://bun.sh

Install dependencies

bun install

Build

bun run build

The output will be in the dist folder.

Test

Create *.test.ts files and run tests with:

bun run test
# or watch test
bun run test:watch

Format the code

bun run format

Generate the documentation

bun run docs