Metamask: As a developer how to let user of your DAPP choose the preferred wallet

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Implementing Custom Wallet Selection for a Decentralized Application (DAPP)

As developers building 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 by using the MetaMask web3 library and its window.ethereum.enable() function.

Understanding Web3 Library

Before diving into the implementation, it’s essential 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 the list of supported providers. This includes popular wallets like MetaMask, Coinbase Wallet, and others.

Implementing Custom Wallet Selection

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

• Obtain the User’s Web3 Provider: Use window.ethereum.enable() to obtain the user’s Web3 provider (e.g., MetaMask) object.

• Get the Supported Wallets: Retrieve a list of supported wallet providers from the window.ethereum object using window.ethereum.supportedWallets.

• Select the Preferred Wallet

  

  : Use the retrieved list to select the preferred wallet and inject it into your DAPP.

Here’s an example implementation:

function getPreferredWallet() {

    const ethereum = window.ethereum;

    const supportedWallets = ethereum.supportedWallets;


    // Filter wallets by user's preferred provider (e.g., MetaMask)

    const preferredWallets = supportedWallets.filter((provider) => provider.name === 'MetaMask');


    return preferredWallets;

}


// Call the function to get the preferred wallet

const preferredWallet = getPreferredWallet();


if (preferredWallet.length > 0) {

    // Inject the selected 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

Suppose 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 = window.ethereum;

    const supportedWallets = ethereum.supportedWallets;


    // Filter wallets by user's preferred provider (e.g., MetaMask)

    const preferredWallets = supportedWallets.filter((provider) => provider.name === 'MetaMask');


    return preferredWallets;

}


// Call the function to get the preferred wallet

const preferredWallet = getPreferredWallet();


if (preferredWallet.length > 0) {

    // Inject 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 inject it into your DApp.

Conclusion

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

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