Using the useSignMessage hook

The useSignMessage hook is part of the Ledger Wallet API Client for React. It allows the application to request the user to sign a message with their Ledger Wallet.

Introduction

The useSignMessage hook facilitates the process of signing a message using a user’s Ledger Wallet.

Usage

1. Import the necessary dependencies and hooks from the Ledger Wallet API Client.

2. Use the useSignMessage hook in your component.

3. Call the signMessage function with the account ID and the message to be signed.

Example

Here’s an example of how to use the useSignMessage hook within a simple React application:

Required permission: message.sign

import React, { useEffect, useState } from "react";
import {
  useRequestAccount,
  useSignMessage,
} from "@ledgerhq/wallet-api-client-react";
 
function App() {
  const { requestAccount, account } = useRequestAccount();
  const { signMessage, signature } = useSignMessage();
 
  // Prompt the user to select an account on component mount
  useEffect(() => {
    requestAccount();
  }, [requestAccount]);
 
  const handleSignMessage = async () => {
    if (!account) return;
    await signMessage(account.id, Buffer.from("Hello, Ledger!"));
  };
 
  return (
    <div>
      <h1>Test Live App - Wallet API</h1>
      <div className="card">
        <button onClick={handleSignMessage}>Sign Message</button>
        {signature && (
          <div>
            <h3>Signed Message:</h3>
            <p>{signature}</p>
          </div>
        )}
      </div>
    </div>
  );
}
 
export default App;

Parameters

The signMessage function takes the following parameters:

• accountId: A string representing the account ID, typically obtained through the useRequestAccount hook.
• message: A string representing the message to be signed.

Return Value

The signMessage function returns a promise that resolves to a string, representing the signed message.

Handling Responses

Once the signMessage function is called, it will trigger the Ledger Wallet interface for the user to confirm the signing. After confirmation, the promise will resolve with the signed message. You should handle this asynchronously and update the UI accordingly.

Errors

If an error occurs during the message signing, such as the user declining to sign the message, the promise will be rejected. It is good practice to catch and handle these errors appropriately.