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index.js
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index.js
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const { ethers } = require('ethers')
// Outputted by solc contracts/DeploylessUniversalSigValidator.sol --bin --optimize --optimize-runs=1
const universalValidator = '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'
/**
* @typedef { import("@ethersproject/abstract-signer").TypedDataDomain } TypedDataDomain
* @typedef { import("@ethersproject/abstract-signer").TypedDataField } TypedDataField
* @typedef { import("@ethersproject/providers").Provider } Provider
* @typedef { import("@viem").PublicClient } PublicClient
*/
/**
* @param {Provider | window.ethereum | PublicClient} provider Web3 Compatible provider to perform smart contract wallet validation with EIP 1271 (window.ethereum, web3.currentProvider, ethers provider, viem publicClient... )
* @param {string} signer The signer address to verify the signature against
* @param {string | Uint8Array} message To verify eth_sign type of signatures. Human-readable message to verify. Message should be a human string or the hex version of the human string encoded as Uint8Array. If a hex string is passed, it will be considered as a regular string
* @param {{domain: TypedDataDomain, types: Record<string, Array<TypedDataField>>, message: Record<string, any>}} typedData To verify a 712 signature type. The {domain, type, message} 712 message object
* @param {string} finalDigest The final digest to verify. dApp will have to pre-compute the hash as no hashing transformation will occur and this digest will be directly used for recoverAddress and isValidSignature
* @param {string | Uint8Array} signature The signature to verify as a hex string or Uint8Array
* @param {function(string, string, string | Uint8Array): boolean} undeployedCallback An optional 1271 callback function to gracefully handle signature validation for non-deployed smart contract wallets
* @returns {Promise<boolean>}
* NOTE: you only need to pass one of: typedData, finalDigest, message
*/
const verifyMessage = async ({ provider, signer, message, typedData, finalDigest, signature }) => {
if (message) {
finalDigest = ethers.utils.hashMessage(message)
} else if (typedData) {
if (!typedData.domain || !typedData.types || !typedData.message) {
throw Error('Missing one or more properties for typedData (domain, types, message)')
}
finalDigest = ethers.utils._TypedDataEncoder.hash(typedData.domain, typedData.types, typedData.message)
} else if (!finalDigest) {
throw Error('Missing one of the properties: message, unPrefixedMessage, typedData or finalDigest')
}
// this 'magic' universal validator contract will deploy itself within the eth_call, try to verify the signature using
// ERC-6492, ERC-1271 and ecrecover, and return the value to us
const coder = new ethers.utils.AbiCoder()
const callResult = await provider.call({
data: ethers.utils.hexConcat([
universalValidator,
coder.encode(['address', 'bytes32', 'bytes'], [signer, finalDigest, signature])
]),
}).then(result => (typeof result !== 'string') ? result.data : result);
if (callResult === '0x01') return true
if (callResult === '0x00') return false
if (callResult.startsWith('0x08c379a0')) throw new Error(coder.decode(['string'], '0x' + callResult.slice(10))[0])
throw new Error('Unexpected result from UniversalValidator: '+callResult)
}
module.exports = {
verifyMessage
}