ethers-signers-browser

A ethers-signers-compatible Signer which uses the browser's window.ethereum object to sign transactions, allowing you to use your Coinbase Wallet, MetaMask, or other browser-based Ethereum wallet from the comfort of the CLI.

For more information about how to use a signer, please refer to the ethers-rs book.

Installation

cargo add ethers-signers-browser

ethers-signers-browser = "0.2.0"

Examples

use ethers::{core::{k256::ecdsa::SigningKey, types::TransactionRequest}, signers::Signer};
use ethers_signers_browser::BrowserSigner;

# async fn foo() -> Result<(), Box<dyn std::error::Error>> {
// instantiate the wallet with a chain id,
// you will be prompted to unlock your wallet in the browser
let wallet = BrowserSigner::new(0).await?;

// create a transaction
let tx = TransactionRequest::new()
    .to("vitalik.eth") // this will use ENS
    .value(10000).into();

// sign it, again, you will be prompted to sign it in the browser
let signature = wallet.sign_transaction(&tx).await?;

// can also sign a message, again, you will be prompted to sign it in the browser
let signature = wallet.sign_message("hello world").await?;
signature.verify("hello world", wallet.address()).unwrap();
# Ok(())
# }

Screenshots

Let's say you were running the following code:

use ethers::signers::Signer;
use ethers_signers_browser::BrowserSigner;

# async fn foo() -> Result<(), Box<dyn std::error::Error>> {
let signer = BrowserSigner::new(14).await.unwrap();
let message = "hello world".as_bytes();
let sig = signer.sign_message(&message).await.unwrap();
# Ok(())
# }

When the BrowserSigner is created, your browser will open a page and prompt you to unlock your wallet. The URL will look something like this: http://localhost:PORT/?nonce=NONCE where PORT and NONCE are random numbers, e.g. http://localhost:7777/?nonce=123.

You will then see the following page:

And, probably at the same time, a popup from your wallet:

Once you have unlocked your wallet, your code will continue to run until it reaches sign_message, after which you will be prompted to sign the message: