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import { getContractInterface } from '@eth-optimism/contracts'
import { ethers } from 'ethers'
import { CoreCrossChainMessage } from '../interfaces'
/**
* Returns the canonical encoding of a cross chain message. This encoding is used in various
* locations within the Optimism smart contracts.
*
* @param message Cross chain message to encode.
* @returns Canonical encoding of the message.
*/
export const encodeCrossChainMessage = (
message: CoreCrossChainMessage
): string => {
return getContractInterface('L2CrossDomainMessenger').encodeFunctionData(
'relayMessage',
[message.target, message.sender, message.message, message.messageNonce]
)
}
/**
* Returns the canonical hash of a cross chain message. This hash is used in various locations
* within the Optimism smart contracts and is the keccak256 hash of the result of
* encodeCrossChainMessage.
*
* @param message Cross chain message to hash.
* @returns Canonical hash of the message.
*/
export const hashCrossChainMessage = (
message: CoreCrossChainMessage
): string => {
return ethers.utils.solidityKeccak256(
['bytes'],
[encodeCrossChainMessage(message)]
)
}