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COWShed.sol
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COWShed.sol
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// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.25;
import { ICOWAuthHook, Call } from "./ICOWAuthHook.sol";
import { LibAuthenticatedHooks } from "./LibAuthenticatedHooks.sol";
import { COWShedStorage, IMPLEMENTATION_STORAGE_SLOT } from "./COWShedStorage.sol";
import { REVERSE_REGISTRAR } from "./ens.sol";
contract COWShed is ICOWAuthHook, COWShedStorage {
error InvalidSignature();
error OnlyTrustedExecutor();
error OnlySelf();
error AlreadyInitialized();
error OnlyAdmin();
error OnlyAdminOrTrustedExecutorOrSelf();
event TrustedExecutorChanged(address previousExecutor, address newExecutor);
event Upgraded(address indexed implementation);
bytes32 internal constant domainTypeHash =
keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)");
modifier onlyTrustedExecutor() {
if (msg.sender != _state().trustedExecutor) {
revert OnlyTrustedExecutor();
}
_;
}
modifier onlyAdmin() {
if (msg.sender != _admin()) {
revert OnlyAdmin();
}
_;
}
function initialize(address factory, bool claimResolver) external {
if (_state().initialized) {
revert AlreadyInitialized();
}
_state().initialized = true;
_state().trustedExecutor = factory;
emit TrustedExecutorChanged(address(0), factory);
if (block.chainid == 1 && claimResolver) {
// transfer ownership of reverse ENS record to the factory contract
// and also set it as the resolver
REVERSE_REGISTRAR.claimWithResolver(factory, factory);
}
}
/// @inheritdoc ICOWAuthHook
function executeHooks(Call[] calldata calls, bytes32 nonce, uint256 deadline, bytes calldata signature) external {
address admin = _admin();
(bool authorized) =
LibAuthenticatedHooks.authenticateHooks(calls, nonce, deadline, admin, signature, domainSeparator());
if (!authorized) {
revert InvalidSignature();
}
_executeCalls(calls, nonce);
}
/// @custom:todo doesn't make sense to commit some other contract's sigs nonce here.
/// @inheritdoc ICOWAuthHook
function trustedExecuteHooks(Call[] calldata calls) external onlyTrustedExecutor {
LibAuthenticatedHooks.executeCalls(calls);
}
/// @notice set resolver for reverse resolution. mostly a utility function for users who opted out of
/// ens at initialization, but want to initialize it after.
function claimWithResolver(address resolver) external {
if (msg.sender != _admin() && msg.sender != _state().trustedExecutor && msg.sender != address(this)) {
revert OnlyAdminOrTrustedExecutorOrSelf();
}
// transfer ownership of reverse ENS record to the factory contract
// and also set it as the resolver
REVERSE_REGISTRAR.claimWithResolver(resolver, resolver);
}
/// @inheritdoc ICOWAuthHook
function updateTrustedExecutor(address who) external {
if (msg.sender != address(this)) {
revert OnlySelf();
}
address prev = _state().trustedExecutor;
_state().trustedExecutor = who;
emit TrustedExecutorChanged(prev, who);
}
/// @notice Update the implementation of the proxy
function updateImplementation(address newImplementation) external onlyAdmin {
assembly {
sstore(IMPLEMENTATION_STORAGE_SLOT, newImplementation)
}
emit Upgraded(newImplementation);
}
/// @notice Revoke a given nonce. Only the proxy owner/admin can do this.
function revokeNonce(bytes32 nonce) external onlyAdmin {
_useNonce(nonce);
}
receive() external payable { }
/// @notice returns if a nonce is already used.
function nonces(bytes32 nonce) external view returns (bool) {
return _isNonceUsed(nonce);
}
/// @notice EIP712 domain separator for the user proxy.
function domainSeparator() public view returns (bytes32) {
string memory name = "COWShed";
string memory version = "1.0.0";
return keccak256(
abi.encode(domainTypeHash, keccak256(bytes(name)), keccak256(bytes(version)), block.chainid, address(this))
);
}
/// @notice trusted executor that can execute arbitrary calls without signature verifications.
function trustedExecutor() external view returns (address) {
return _state().trustedExecutor;
}
function _executeCalls(Call[] calldata calls, bytes32 nonce) internal {
_useNonce(nonce);
LibAuthenticatedHooks.executeCalls(calls);
}
}