Add support for EIP-712 transaction type (zkSync requirement)

[omurovec]

Component

Forge

Describe the feature you would like

Overview

zkSync deployments use an EIP-712 style transaction for contract deployments rather than the standard EIP-1559. As far as I know this is only used by zkSync but it would be very helpful to have for deployments. Without support for this transaction type, deployment to zkSync with foundry is not possible other than deploying from L1 through the bridge.

Details

The EIP-712 transaction type defined by zkSync follows the format below:

const EIP712_TYPE = "0x71";
const data = EIP712_TYPE + RLP.encode([
   nonce,
   maxPriorityFeePerGas,
   maxFeePerGas,
   gasLimit,
   to,
   value,
   data,
   chainId,
   0x,
   0x,
   chainId,
   from,
   gasPerPubData,
   factoryDeps[],
   customSignature, // EIP712 signature
   [paymaster, paymasterInput]
]);
sendTransaction(data);

where customSignature is a signature of the following struct:

Field name	Type
txType	uint256
from	uint256
to	uint256
gasLimit	uint256
gasPerPubdataByteLimit	uint256
maxFeePerGas	uint256
maxPriorityFeePerGas	uint256
paymaster	uint256
nonce	uint256
value	uint256
data	bytes
factoryDeps	bytes32[]
paymasterInput	bytes

Additional context

Implementation wise it would not make sense to add support for this specific transaction type, but it may be feasible to add a cheatcode for generic sendTransaction or any other RPC calls.

Leaving the proper implementation open to discussion.