Implementing Custom Wallet Selection for a Decentralized Application (DAPP)

As developers build decentralized applications (DApps), we often want to provide users with the flexibility to choose their preferred wallet when interacting with our platform. In this article, we will explore how to achieve this using the MetaMask web3 library and its “window.ethereum.enable()” function.

Understanding the Web3 Library

Before diving into the implementation, it is important to understand how the MetaMask library interacts with the Ethereum blockchain. The “window.ethereum” object provides an interface for interacting with the user’s wallet, which is stored in the browser as a web cryptography (Web3) provider.

The “window.ethereum.enable()” function allows users to select their preferred wallet from a list of supported providers. This includes popular wallets such as MetaMask, Coinbase Wallet, and others.

Implementing Custom Wallet Selection

To implement custom wallet selection for your DAPP, you can use the following approach:

• Get the user’s Web3 provider: Use “window.ethereum.enable()” to get the user’s Web3 provider (e.g. MetaMask) object.

• Get supported wallets

  : Retrieve the list of supported wallet providers from the “window.ethereum” object using “window.ethereum.supportedWallets”.

• Select preferred wallet: Use the retrieved list to select the preferred wallet and enter it into your DAPP.

Here is an example implementation:

function getPreferredWallet() {
const ethereum = logs.ethereum;
const supported Wallets = ethereum.supported Wallets;
// Filter wallets by the user's preferred provider (e.g. MetaMask)
const preference Wallets = supported Wallets.filter((provider) => provider.name === 'MetaMask');
return preferredWallet;
}
// Call the function to get the preferred wallet
const preferenceWallet = getPreferredWallet();
if (preferredWallet.length > 0) {
// Enter the preferred wallet into your DAPP
const walletProvider = window.ethereum.currentProvider;
if (walletProvider) {
window.ethereum.currentProvider.on("connected", () => {
console.log(Connected to ${walletProvider.name});
});
}
}

Example use case

Let’s say you’re building a DApp that uses the MetaMask wallet provider. In this case, your code would look like this:

import Web3 from "web3";
const web3 = new Web3(window.ethereum);
// Function to get the preferred wallet
function getPreferredWallet() {
const ethereum = logs.ethereum;
const supported Wallets = ethereum.supported Wallets;
// Filter wallets by the user's preferred provider (e.g. MetaMask)
const preference Wallets = supported Wallets.filter((provider) => provider.name === 'MetaMask');
return preferredWallet;
}
// Call the function to get the preferred wallet
const preferenceWallet = getPreferredWallet();
if (preferredWallet.length > 0) {
// Load the selected wallet into your DApp
window.ethereum.currentProvider.on("connected", () => {
console.log(Connected to ${window.ethereum.currentProvider.name});
});
}

In this example, when a user logs in with their MetaMask wallet provider, your code will detect the preferred wallet and load it into your DApp.

Conclusion

Implementing custom wallet selection in your DApps can help give users flexibility and control over their wallet providers. By using the “window.ethereum” object and filtering the supported wallets by the user’s preferred provider (e.g. MetaMask), you can create a seamless experience for your users. Remember to call the “getPreferredWallet()” function to retrieve the preferred wallet and load it into your DApp.