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pragma solidity ^0.8.9;
contract MessageEncodingHelper {
// This function is copy/pasted from the Lib_CrossDomainUtils library. We have to do this
// because the Lib_CrossDomainUtils library does not provide a function for hashing. Instead,
// I'm duplicating the functionality of the library here and exposing an additional method that
// does the required hashing. This is fragile and will break if we ever update the way that our
// contracts hash the encoded data, but at least it works for now.
// TODO: Next time we're planning to upgrade the contracts, make sure that the library also
// contains a function for hashing.
function encodeXDomainCalldata(
address _target,
address _sender,
bytes memory _message,
uint256 _messageNonce
) public pure returns (bytes memory) {
return
abi.encodeWithSignature(
"relayMessage(address,address,bytes,uint256)",
_target,
_sender,
_message,
_messageNonce
);
}
function hashXDomainCalldata(
address _target,
address _sender,
bytes memory _message,
uint256 _messageNonce
) public pure returns (bytes32) {
return keccak256(
encodeXDomainCalldata(
_target,
_sender,
_message,
_messageNonce
)
);
}
}