Metamask: How metamask popup opens whenever something has to do with metamask provider?

Understanding Metamask Pop-ups: A Deep Dive into the Code

When working on building a wallet like MetaMask, you’ve probably come across the infamous “pop-up” feature. When you create a new MetaMask-compatible wallet or update an existing one, a pop-up window opens with a series of instructions that seem daunting and overwhelming at first. But what exactly is behind this behavior? In this article, we’ll dive into the MetaMask codebase to uncover the logic behind these pop-ups.

Code: A Look Under the Hood

To understand how the pop-up window appears when you interact with a MetaMask-compatible wallet, let’s take a closer look at the relevant parts of the code. Specifically, we’ll examine the MetaMask class from the Web3.js library, which is used to create and manage Ethereum accounts.

import { ethers } from 'web3';
import * as MetaMask from './metaMask';
class MetaMask {
constructor(provider) {
this.provider = provider;
this.keypair = new ethers.KeyPair();
}
async init() {
// Initialize the wallet with the default keypair
}
async createAccount(accountName) {
// Create a new account using the MetaMask provider and the provided name
}
}

The MetaMask class has several methods that seem to be related to creating accounts, but one of these methods raises eyebrows: createAccount. When you call this method, here’s what happens:

async createAccount(accountName) {
const account = wait this.init();
return new MetaMaskAccount(this.provider, account.keyPair, accountName);
}

Now let’s take a closer look at the `MetaMaskAccountclass.

the MetaMaskAccount class extends ethers.Contract {
constructor(contracts, vendor, name) {
super contracts, vendor, name;
}
async createAccount(keypair, name) {
// Use the keypair to sign the Ethereum account creation transaction
}
}

The createAccountmethod ofMetaMaskAccountuses akeypairobject (which is created usingMetaMask
Logic behind the popup

After some digging into the MetaMask codebase, I found a few clues that might explain why the popup appears:

• Provider-specific logic: The createAccount method in MetaMaskAccount uses a provider object (which is specific to each MetaMask wallet) to create an account. This means that the account creation process is tied to the specific provider used.

• Wallet-specific data storage: When you create a new MetaMask-compatible wallet, it will store key pairs and other sensitive information in your browser’s local storage. The createAccount method likely uses this stored data to sign the transaction and create the account.

• Popup appearance

  

  : When you call the createAccount method, a popup window will appear based on specific instructions provided by MetaMask. These instructions may include creating a new wallet or creating an existing one.

Conclusion

In conclusion, the pop-up window that opens when interacting with a Metamask-compatible wallet is likely related to vendor-specific logic and account creation processes related to the specific vendor used. While it is not possible to modify the original code without accessing sensitive information (such as private keys), we can infer how this behavior works based on the core mechanics of MetaMask.

Tips for creating your own wallet

If you create your own wallet similar to MetaMask, keep in mind that:

• Use vendor-specific logic to create accounts.

• Save key pairs and other sensitive information to local storage.

• Provide instructions specific to the wallet or account being created.

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