Sign Authorization (EIP7702) with Metamask

[v0dev]

Hi,
I have a requirement to sign the authorization for EIP7702 with metamask (revoke delegation), but I get the error: authorization not implemented for this signer (operation="authorize", code=UNSUPPORTED_OPERATION, version=6.15.0)

Is there any way to sign authorization payload to be sent through another address using browser provider?

[ricmoo]

Does MetaMask offer an API (via JSON-RPC)? I don’t know of any yet, but if one exists I can add the convenience method. If they provide an API, you can also just the raw .send method.

But I don’t believe there is any plan for them to expose a public API that can be used by dapps. There is a lot of security and predictability issues with a standard wallet allowing Auth transactions (could render the wallet unusable, might break UX and nonce calculations, etc), so I don’t think that will be common.

If you have a private key that you want to authorize, you would use that private key to authorize and then pass that to the authorization in a separate tx, possibly to MetaMask. I’m actually not sure if MetaMask even allows 7702 transactions, but if you try it out, please report back here. :)

[nullkecakke256felix]

Foo Bar Boleon bool

[GrandSchtroumpf]

@ricmoo This is an example from Metamask on how to run EIP7702 transaction with Viem.
https://docs.metamask.io/smart-accounts-kit/get-started/smart-account-quickstart/eip7702/

From what I understand they only allow their delegator to be used:
https://github.com/MetaMask/smart-accounts-kit/blob/main/packages/delegation-deployments/src/contractAddresses.ts#L8

I'm trying to implement the authorize, using BaseWallet implementation as reference, with new BrowserProvider.getSigner(). I'm using signMessage() but it doesn't work. Maybe you'd know why, and how to make it works :

const provider = new BrowserProvider(...);
const signer = provider.getSigner();
const auth = {
  address: metaMaskEip7702Delegator,
  nonce,
  chainId
};
// signer.authorize(auth); // not working

// Workaround (not working either ^^)
const signature = await signer.signMessage(hashAuthorization(auth));
const signedAuthorization = {
  address: getAddress(auth.address),
  nonce: getBigInt(auth.nonce || 0),
  chainId: getBigInt(auth.chainId || 0),
  signature
};

signer.sendTransaction({
  ...tx,
  type: 4, 
  authorizationList: [signedAuthorization],
});