Metamask: How to use signer data from ethers.js to sign transactions with web3.py

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Signing transactions with Web3.py and Metamask wallet using Ethers.js

As part of building a decentralized application, it is common to require users to sign transactions with their MetaMask wallets. To facilitate this process, you will need to use an external wallet solution such as Ethereum.js (Ethers.js) combined with the popular web3.py library.

In this article, we’ll explore how to use Metamask data from ethers.js to sign transactions with web3.py in your dApp.

1. step: Install dependencies

First, make sure you have the necessary dependencies installed:

npm install ethers ethers-web3

Step 2: Initialize Ethers.js and Web3.py

Create a new file for your dApp’s initialization code, e.g. app.js:

const Web3 = require('web3');

const Ethers = require('ethers/web3');
// Initialize Ethers.js
const ethers = new Web3(new URL('

Replace YOUR_PROJECT_ID with your actual Infura project ID.

Step 3: Retrieve the user’s MetaMask details

To get the user’s MetaMask details, you will need to connect their wallet to ethers.js using the ethers.connect() method. You can use a library like ethers-connection to simplify this process:

const ethersConnect = require('ethers-connection');
// Retrieve the user's metamask wallet address and private key

ethers.connect({

  accounts: ['YOUR_METAMASK_ADDRESS'],

}, async (address, private key) => {

  // Use these credentials to later sign transactions with web3.py

});

Replace YOUR_METAMASK_ADDRESS with your actual MetaMask address.

Step 4: Sign transactions using Web3.py

Now that you have the user metamask information, you can use it to sign transactions with web3.py. Create a new file for your dApp’s transaction processing code:

const web3 = require('web3');


// Get the signed address from the ethers.js connection

async function getSignedAddress(address, privateKey) {

  const web3Instance = new web3.Web3();

  return await web3Instance.eth.accounts.signTransaction({

    to: address,

    data: '', // You can use transaction data here

  }, private key)

    .then((signedTx) => signedTx.rawTransaction)

    .then((signedTxRaw) => signedTx.rawTransaction);

}


module.exports = {getSignedAddress};

This function takes the user’s Metamask address and private key as arguments, creates a new Web3 instance, signs the transaction with the specified details, and returns the raw transaction.

Putting It All Together

Here is an example of how you can use these functions in your dApp:

const app = require('./app');


// Initialize Ethers.js and Web3.py

require('./initEthers')(ethers);

const { getSignedAddress } = require('./getSignedAddress');
module.exports = async (req, res) => {
const address = 'YOUR_METAMASK_ADDRESS';
const privateKey = 'YOUR_PRIVATE_KEY';
// Get signed transaction using web3.py and Metamask details
const signedTx = await app.getSignedAddress(address, privatekey);
// Send signed transaction to Ethers.js for verification
ethers.connect({
accounts: [address],
}, async (account) => {
const txHash = await account.sendTransaction(signedTx);
console.log(Transaction sent to ${txHash.address});
});
};

This example assumes that you have already initialized the getSignedAddress function in your dApp’s main file (app.js). You can replace YOUR_METAMASK_ADDRESS and YOUR_PRIVATE_KEY with your actual MetaMask credentials.

Conclusion

Signing Metamask wallet transactions using ethers.js is a simple process that uses Web3.py to verify the transaction. By following these steps, you will be able to integrate your dApp with Ethereum.js solutions such as web3.